internal string Decrypt(string cryptText, string encryptionKey, bool isPrivate)
{
RsaKeyParameters key;
byte[] data = null;
List<byte> output = new List<byte>();
string result = null;
try
{
if (isPrivate)
key = RsaPrivateStringToRsaKey(encryptionKey);
else
key = RsaPublicStringToRsaKey(encryptionKey);
data = Hex.Decode(cryptText);
IAsymmetricBlockCipher e = new Pkcs1Encoding(new RsaEngine()).GetUnderlyingCipher();
e.Init(false, key);
int blockSize = e.GetInputBlockSize();
if (data != null)
{
for (int chunkPosition = 0; chunkPosition < data.Length; chunkPosition += blockSize)
{
int chunkSize;
if (data.Length <= blockSize)
chunkSize = data.Length;
else if ((chunkPosition + blockSize) > data.Length)
chunkSize = data.Length - chunkPosition;
else
chunkSize = blockSize;
if (chunkSize <= 0)
break;
output.AddRange(e.ProcessBlock(data, chunkPosition, chunkSize));
}
result = ByteArrayToString(output.ToArray());
}
}
catch (Exception ex)
{
Debug.Write(ex.ToString());
}
return result;
}
public virtual void GenerateClientKeyExchange(Stream output)
{
/*
* Choose a PremasterSecret and send it encrypted to the server
*/
premasterSecret = new byte[48];
context.SecureRandom.NextBytes(premasterSecret);
TlsUtilities.WriteVersion(premasterSecret, 0);
Pkcs1Encoding encoding = new Pkcs1Encoding(new RsaBlindedEngine());
encoding.Init(true, new ParametersWithRandom(this.rsaServerPublicKey, context.SecureRandom));
try
{
byte[] keData = encoding.ProcessBlock(premasterSecret, 0, premasterSecret.Length);
TlsUtilities.WriteUint24(keData.Length + 2, output);
TlsUtilities.WriteOpaque16(keData, output);
}
catch (InvalidCipherTextException)
{
/*
* This should never happen, only during decryption.
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public string decryptPasswordUsingPem(string password)
{
try
{
var passwordBytes = Convert.FromBase64String(password);
AsymmetricCipherKeyPair keyPair;
PathToPemKey = PathToPemKey ?? "Where is the PEM private Key".askUser();
if (PathToPemKey.isFolder())
PathToPemKey = PathToPemKey.files("*.pem").first();
if (PathToPemKey.valid() && PathToPemKey.fileExists())
{
using (var reader = File.OpenText(PathToPemKey))
keyPair = (AsymmetricCipherKeyPair) new PemReader(reader).ReadObject();
var decryptEngine = new Pkcs1Encoding(new RsaEngine());
decryptEngine.Init(false, keyPair.Private);
var decryptedPassword = Encoding.UTF8.GetString(decryptEngine.ProcessBlock(passwordBytes, 0, passwordBytes.Length));
return decryptedPassword;
}
"in decryptPasswordUsingPem, there was no PEM file provided or found".error();
}
catch(Exception ex)
{
"[API_RSA] in decryptPasswordUsingPem: {0}".error(ex.Message);
}
return null;
}
public static byte[] GenerateEncryptedPreMasterSecret(SecureRandom random,
RsaKeyParameters rsaServerPublicKey, Stream output)
{
/*
* Choose a PremasterSecret and send it encrypted to the server
*/
byte[] premasterSecret = new byte[48];
random.NextBytes(premasterSecret);
TlsUtilities.WriteVersion(premasterSecret, 0);
Pkcs1Encoding encoding = new Pkcs1Encoding(new RsaBlindedEngine());
encoding.Init(true, new ParametersWithRandom(rsaServerPublicKey, random));
try
{
byte[] keData = encoding.ProcessBlock(premasterSecret, 0, premasterSecret.Length);
TlsUtilities.WriteOpaque16(keData, output);
}
catch (InvalidCipherTextException)
{
/*
* This should never happen, only during decryption.
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
return premasterSecret;
}
public string Decrypt(string str)
{
if (string.IsNullOrEmpty(str)) return "";
var dat = Convert.FromBase64String(str);
var encoding = new Pkcs1Encoding(engine);
encoding.Init(false, key);
return Encoding.UTF8.GetString(encoding.ProcessBlock(dat, 0, dat.Length));
}
public string Encrypt(string str)
{
if (string.IsNullOrEmpty(str)) return "";
var dat = Encoding.UTF8.GetBytes(str);
var encoding = new Pkcs1Encoding(engine);
encoding.Init(true, key);
return Convert.ToBase64String(encoding.ProcessBlock(dat, 0, dat.Length));
}
public string RsaEncrypt(string clearText, AsymmetricKeyParameter prywatny)
{
AsymmetricKeyParameter key = prywatny;
var bytesToEncrypt = Encoding.UTF8.GetBytes(clearText);
var encryptEngine = new Pkcs1Encoding(new RsaEngine());
encryptEngine.Init(true, key);
var encrypted = Convert.ToBase64String(encryptEngine.ProcessBlock(bytesToEncrypt, 0, bytesToEncrypt.Length));
return encrypted;
}
public string RsaDecrypt(string base64Input, AsymmetricKeyParameter publiczny)
{
AsymmetricKeyParameter key = publiczny;
var bytesToDecrypt = Convert.FromBase64String(base64Input);
var decryptEngine = new Pkcs1Encoding(new RsaEngine());
decryptEngine.Init(false, key);
string decrypted = Encoding.UTF8.GetString(decryptEngine.ProcessBlock(bytesToDecrypt, 0, bytesToDecrypt.Length));
return decrypted;
}
public byte[] DeSignData(byte[] data)
{
if (OnlyPublic)
throw new NotSupportedException("Private key not available");
var eng = new Pkcs1Encoding(new RsaEngine());
eng.Init(false, RSAKeyPair.Private);
return eng.ProcessBlock(data, 0, data.Length);
}
private void doTestStrictPkcs1Length(RsaKeyParameters pubParameters, RsaKeyParameters privParameters)
{
IAsymmetricBlockCipher eng = new RsaBlindedEngine();
eng.Init(true, privParameters);
byte[] data = null;
try
{
data = eng.ProcessBlock(oversizedSig, 0, oversizedSig.Length);
}
catch (Exception e)
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
eng = new Pkcs1Encoding(eng);
eng.Init(false, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
Fail("oversized signature block not recognised");
}
catch (InvalidCipherTextException e)
{
if (!e.Message.Equals("block incorrect size"))
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
}
// Create the encoding with StrictLengthEnabled=false (done thru environment in Java version)
Pkcs1Encoding.StrictLengthEnabled = false;
eng = new Pkcs1Encoding(new RsaBlindedEngine());
eng.Init(false, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (InvalidCipherTextException e)
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
Pkcs1Encoding.StrictLengthEnabled = true;
}
public static byte[] Decrypt(byte[] buffer)
{
using (TextReader sr = new StringReader(PRIVATE_KEY))
{
PemReader pemReader = new PemReader(sr);
AsymmetricCipherKeyPair keyPair = (AsymmetricCipherKeyPair)pemReader.ReadObject();
RsaKeyParameters privateKey = (RsaKeyParameters)keyPair.Private;
IAsymmetricBlockCipher cipher = new Pkcs1Encoding(new RsaEngine());
cipher.Init(false, privateKey);
return cipher.ProcessBlock(buffer, 0, buffer.Length);
}
}
internal string Encrypt(string plainText, string encryptionKey, bool isPrivate)
{
RsaKeyParameters key;
byte[] data = null;
List<byte> output = new List<byte>();
string result = null;
try
{
if (isPrivate)
key = RsaPrivateStringToRsaKey(encryptionKey);
else
key = RsaPublicStringToRsaKey(encryptionKey);
data = StringToByteArray(plainText);
IAsymmetricBlockCipher e = new Pkcs1Encoding(new RsaEngine()).GetUnderlyingCipher();
e.Init(true, key);
int blockSize = e.GetInputBlockSize();
if (data != null)
{
for (int chunkPosition = 0; chunkPosition < data.Length; chunkPosition += blockSize)
{
int chunkSize;
if (data.Length <= blockSize)
chunkSize = data.Length; // If we have less data then the blockSize, do it all
else if ((chunkPosition + blockSize) > data.Length) // Do we have any remainder data
chunkSize = data.Length - chunkPosition;
else
chunkSize = blockSize; // Normal process, chunk to blockSize
// No more blocks to process
if (chunkSize <= 0)
break;
output.AddRange(e.ProcessBlock(data, chunkPosition, chunkSize));
}
result = Encoding.ASCII.GetString(Hex.Encode(output.ToArray()));
}
}
catch (Exception)
{
}
return result;
}
public static string Crypt(string input)
{
RsaKeyParameters parameters;
AsymmetricCipherKeyPair keyPair;
using (var reader = File.OpenText(@"publickey.pem")) // file containing RSA PKCS1 private key
parameters = (RsaKeyParameters)new PemReader(reader).ReadObject();
keyPair = new AsymmetricCipherKeyPair(parameters, new AsymmetricKeyParameter(true));
var encryptEngine = new Pkcs1Encoding(new RsaEngine());
encryptEngine.Init(true, keyPair.Public);
byte[] utf = Encoding.UTF8.GetBytes(input);
return Convert.ToBase64String(encryptEngine.ProcessBlock(utf, 0, utf.Length));
}
public string RsaEncryptWithPrivate(string clearText, string privateKey)
{
var bytesToEncrypt = Encoding.UTF8.GetBytes(clearText);
var encryptEngine = new Pkcs1Encoding(new RsaEngine());
using (var txtreader = new StringReader(privateKey))
{
var keyPair = (AsymmetricCipherKeyPair)new PemReader(txtreader).ReadObject();
encryptEngine.Init(true, keyPair.Public);
}
var encrypted = Convert.ToBase64String(encryptEngine.ProcessBlock(bytesToEncrypt, 0, bytesToEncrypt.Length));
return encrypted;
}
public static SecureString Decryption(SecureString clientPrivateKey, string encryptedData)
{
var data = Convert.FromBase64String(SecureStringToString(clientPrivateKey));
var decodedPrivateKey = Encoding.UTF8.GetString(data);
var bytesToDecrypt = Convert.FromBase64String(encryptedData);
var decryptEngine = new Pkcs1Encoding(new RsaEngine());
using (var txtreader = new StringReader(decodedPrivateKey))
{
var keyPair = (AsymmetricCipherKeyPair) new PemReader(txtreader).ReadObject();
decryptEngine.Init(false, keyPair.Private);
}
return
StringToSecureString(
Encoding.UTF8.GetString(decryptEngine.ProcessBlock(bytesToDecrypt, 0, bytesToDecrypt.Length)));
}
// Decryption:
public string RsaDecrypt(string base64Input, string privateKey)
{
var bytesToDecrypt = Convert.FromBase64String(base64Input);
//get a stream from the string
AsymmetricCipherKeyPair keyPair;
var decryptEngine = new Pkcs1Encoding(new RsaEngine());
using (var txtreader = new StringReader(privateKey))
{
keyPair = (AsymmetricCipherKeyPair)new PemReader(txtreader).ReadObject();
decryptEngine.Init(false, keyPair.Private);
}
var decrypted = Encoding.UTF8.GetString(decryptEngine.ProcessBlock(bytesToDecrypt, 0, bytesToDecrypt.Length));
return decrypted;
}
public static string DecryptString(string encrypted = null, string keyName = "key")
{
string decrypted = null;
// If no encrypted string, return
if (encrypted == "")
{
return null;
}
var bytesToDecrypt = Convert.FromBase64String(encrypted);
AsymmetricCipherKeyPair keypair;
string path = Path.Combine(Directory.GetCurrentDirectory(), @"..\..\Keys\" + keyName + ".pem");
path = Path.GetFullPath(path);
using (var reader = File.OpenText(path))
{
keypair = (AsymmetricCipherKeyPair)new PemReader(reader).ReadObject();
}
var decryptEngine = new Pkcs1Encoding(new RsaEngine());
decryptEngine.Init(false, keypair.Private);
decrypted = Encoding.UTF8.GetString(decryptEngine.ProcessBlock(bytesToDecrypt, 0, bytesToDecrypt.Length));
return decrypted;
}
/// <exception cref="IOException"></exception>
public static byte[] GenerateEncryptedPreMasterSecret(TlsContext context, RsaKeyParameters rsaServerPublicKey,
Stream output)
{
/*
* Choose a PremasterSecret and send it encrypted to the server
*/
byte[] premasterSecret = new byte[48];
context.SecureRandom.NextBytes(premasterSecret);
TlsUtilities.WriteVersion(context.ClientVersion, premasterSecret, 0);
Pkcs1Encoding encoding = new Pkcs1Encoding(new RsaBlindedEngine());
encoding.Init(true, new ParametersWithRandom(rsaServerPublicKey, context.SecureRandom));
try
{
byte[] encryptedPreMasterSecret = encoding.ProcessBlock(premasterSecret, 0, premasterSecret.Length);
if (TlsUtilities.IsSsl(context))
{
// TODO Do any SSLv3 servers actually expect the length?
output.Write(encryptedPreMasterSecret, 0, encryptedPreMasterSecret.Length);
}
else
{
TlsUtilities.WriteOpaque16(encryptedPreMasterSecret, output);
}
}
catch (InvalidCipherTextException e)
{
/*
* This should never happen, only during decryption.
*/
throw new TlsFatalAlert(AlertDescription.internal_error, e);
}
return premasterSecret;
}
public static byte[] SafeDecryptPreMasterSecret(TlsContext context, RsaKeyParameters rsaServerPrivateKey,
byte[] encryptedPreMasterSecret)
{
/*
* RFC 5246 7.4.7.1.
*/
ProtocolVersion clientVersion = context.ClientVersion;
// TODO Provide as configuration option?
bool versionNumberCheckDisabled = false;
/*
* Generate 48 random bytes we can use as a Pre-Master-Secret, if the
* PKCS1 padding check should fail.
*/
byte[] fallback = new byte[48];
context.SecureRandom.NextBytes(fallback);
byte[] M = Arrays.Clone(fallback);
try
{
Pkcs1Encoding encoding = new Pkcs1Encoding(new RsaBlindedEngine(), fallback);
encoding.Init(false,
new ParametersWithRandom(rsaServerPrivateKey, context.SecureRandom));
M = encoding.ProcessBlock(encryptedPreMasterSecret, 0, encryptedPreMasterSecret.Length);
}
catch (Exception)
{
/*
* This should never happen since the decryption should never throw an exception
* and return a random value instead.
*
* In any case, a TLS server MUST NOT generate an alert if processing an
* RSA-encrypted premaster secret message fails, or the version number is not as
* expected. Instead, it MUST continue the handshake with a randomly generated
* premaster secret.
*/
}
/*
* If ClientHello.client_version is TLS 1.1 or higher, server implementations MUST
* check the version number [..].
*/
if (versionNumberCheckDisabled && clientVersion.IsEqualOrEarlierVersionOf(ProtocolVersion.TLSv10))
{
/*
* If the version number is TLS 1.0 or earlier, server
* implementations SHOULD check the version number, but MAY have a
* configuration option to disable the check.
*
* So there is nothing to do here.
*/
}
else
{
/*
* OK, we need to compare the version number in the decrypted Pre-Master-Secret with the
* clientVersion received during the handshake. If they don't match, we replace the
* decrypted Pre-Master-Secret with a random one.
*/
int correct = (clientVersion.MajorVersion ^ (M[0] & 0xff))
| (clientVersion.MinorVersion ^ (M[1] & 0xff));
correct |= correct >> 1;
correct |= correct >> 2;
correct |= correct >> 4;
int mask = ~((correct & 1) - 1);
/*
* mask will be all bits set to 0xff if the version number differed.
*/
for (int i = 0; i < 48; i++)
{
M[i] = (byte)((M[i] & (~mask)) | (fallback[i] & mask));
}
}
return M;
}
/// <summary>
/// Client side encryption
/// </summary>
public CryptoMC(Stream baseStream, EncryptionRequest req)
{
this.BaseStream = baseStream;
RijndaelManaged rm = new RijndaelManaged();
rm.KeySize = 128;
rm.GenerateKey();
SharedKey = rm.Key;
InitCiphers();
//Encrypt shared key using public key in req
AsymmetricKeyParameter asymmetricKeyParameter = PublicKeyFactory.CreateKey(req.PublicKey);
RsaKeyParameters key = (RsaKeyParameters)asymmetricKeyParameter;
//SubjectPublicKeyInfo s = new SubjectPublicKeyInfo(AlgorithmIdentifier.Der, req.PublicKey);
//RsaKeyParameters key = (RsaKeyParameters)PublicKeyFactory.CreateKey(s);
Pkcs1Encoding padding = new Pkcs1Encoding(new RsaEngine());
padding.Init(true, key);
SharedKeyEncrypted = padding.ProcessBlock(SharedKey, 0, SharedKey.Length);
Pkcs1Encoding padding2 = new Pkcs1Encoding(new RsaEngine());
padding2.Init(true, keyParameters);
TestEncrypted = padding.ProcessBlock(req.VerifyToken, 0, req.VerifyToken.Length);
}
public override void PerformTest()
{
RsaKeyParameters pubParameters = new RsaKeyParameters(false, mod, pubExp);
RsaKeyParameters privParameters = new RsaPrivateCrtKeyParameters(mod, pubExp, privExp, p, q, pExp, qExp, crtCoef);
byte[] data = Hex.Decode(edgeInput);
//
// RAW
//
IAsymmetricBlockCipher eng = new RsaBlindedEngine();
eng.Init(true, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
eng.Init(false, privParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!edgeInput.Equals(Hex.ToHexString(data)))
{
Fail("failed RAW edge Test");
}
data = Hex.Decode(input);
eng.Init(true, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
eng.Init(false, privParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!input.Equals(Hex.ToHexString(data)))
{
Fail("failed RAW Test");
}
//
// PKCS1 - public encrypt, private decrypt
//
eng = new Pkcs1Encoding(eng);
eng.Init(true, pubParameters);
if (eng.GetOutputBlockSize() != ((Pkcs1Encoding)eng).GetUnderlyingCipher().GetOutputBlockSize())
{
Fail("PKCS1 output block size incorrect");
}
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
eng.Init(false, privParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!input.Equals(Hex.ToHexString(data)))
{
Fail("failed PKCS1 public/private Test");
}
//
// PKCS1 - private encrypt, public decrypt
//
eng = new Pkcs1Encoding(((Pkcs1Encoding)eng).GetUnderlyingCipher());
eng.Init(true, privParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
eng.Init(false, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!input.Equals(Hex.ToHexString(data)))
{
Fail("failed PKCS1 private/public Test");
}
//
// key generation test
//
RsaKeyPairGenerator pGen = new RsaKeyPairGenerator();
RsaKeyGenerationParameters genParam = new RsaKeyGenerationParameters(
BigInteger.ValueOf(0x11), new SecureRandom(), 768, 25);
pGen.Init(genParam);
AsymmetricCipherKeyPair pair = pGen.GenerateKeyPair();
eng = new RsaBlindedEngine();
if (((RsaKeyParameters)pair.Public).Modulus.BitLength < 768)
{
Fail("failed key generation (768) length test");
}
eng.Init(true, pair.Public);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
eng.Init(false, pair.Private);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!input.Equals(Hex.ToHexString(data)))
{
Fail("failed key generation (768) Test");
}
genParam = new RsaKeyGenerationParameters(BigInteger.ValueOf(0x11), new SecureRandom(), 1024, 25);
pGen.Init(genParam);
pair = pGen.GenerateKeyPair();
eng.Init(true, pair.Public);
if (((RsaKeyParameters)pair.Public).Modulus.BitLength < 1024)
{
Fail("failed key generation (1024) length test");
}
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
eng.Init(false, pair.Private);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
}
catch (Exception e)
{
Fail("failed - exception " + e.ToString(), e);
}
if (!input.Equals(Hex.ToHexString(data)))
{
Fail("failed key generation (1024) test");
}
doTestOaep(pubParameters, privParameters);
doTestStrictPkcs1Length(pubParameters, privParameters);
doTestDudPkcs1Block(pubParameters, privParameters);
doTestMissingDataPkcs1Block(pubParameters, privParameters);
doTestTruncatedPkcs1Block(pubParameters, privParameters);
doTestWrongPaddingPkcs1Block(pubParameters, privParameters);
try
{
new RsaBlindedEngine().ProcessBlock(new byte[]{ 1 }, 0, 1);
Fail("failed initialisation check");
}
catch (InvalidOperationException)
{
// expected
}
}
private void checkForPkcs1Exception(RsaKeyParameters pubParameters, RsaKeyParameters privParameters, byte[] inputData, string expectedMessage)
{
IAsymmetricBlockCipher eng = new RsaBlindedEngine();
eng.Init(true, privParameters);
byte[] data = null;
try
{
data = eng.ProcessBlock(inputData, 0, inputData.Length);
}
catch (Exception e)
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
eng = new Pkcs1Encoding(eng);
eng.Init(false, pubParameters);
try
{
data = eng.ProcessBlock(data, 0, data.Length);
Fail("missing data block not recognised");
}
catch (InvalidCipherTextException e)
{
if (!e.Message.Equals(expectedMessage))
{
Fail("RSA: failed - exception " + e.ToString(), e);
}
}
}
private void processHandshake()
{
bool read;
do
{
read = false;
/*
* We need the first 4 bytes, they contain type and length of
* the message.
*/
if (handshakeQueue.Available >= 4)
{
byte[] beginning = new byte[4];
handshakeQueue.Read(beginning, 0, 4, 0);
MemoryStream bis = new MemoryStream(beginning, false);
short type = TlsUtilities.ReadUint8(bis);
int len = TlsUtilities.ReadUint24(bis);
/*
* Check if we have enough bytes in the buffer to read
* the full message.
*/
if (handshakeQueue.Available >= (len + 4))
{
/*
* Read the message.
*/
byte[] buf = new byte[len];
handshakeQueue.Read(buf, 0, len, 4);
handshakeQueue.RemoveData(len + 4);
/*
* If it is not a finished message, update our hashes
* we prepare for the finish message.
*/
if (type != HP_FINISHED)
{
rs.hash1.BlockUpdate(beginning, 0, 4);
rs.hash2.BlockUpdate(beginning, 0, 4);
rs.hash1.BlockUpdate(buf, 0, len);
rs.hash2.BlockUpdate(buf, 0, len);
}
/*
* Now, parse the message.
*/
MemoryStream inStr = new MemoryStream(buf, false);
/*
* Check the type.
*/
switch (type)
{
case HP_CERTIFICATE:
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
/*
* Parse the certificates.
*/
Certificate cert = Certificate.Parse(inStr);
AssertEmpty(inStr);
/*
* Verify them.
*/
if (!this.verifyer.IsValid(cert.GetCerts()))
{
this.FailWithError(AL_fatal, AP_user_canceled);
}
/*
* We only support RSA certificates. Lets hope
* this is one.
*/
RsaPublicKeyStructure rsaKey = null;
try
{
rsaKey = RsaPublicKeyStructure.GetInstance(
cert.certs[0].TbsCertificate.SubjectPublicKeyInfo.GetPublicKey());
}
catch (Exception)
{
/*
* Sorry, we have to fail ;-(
*/
this.FailWithError(AL_fatal, AP_unsupported_certificate);
}
/*
* Parse the servers public RSA key.
*/
this.serverRsaKey = new RsaKeyParameters(
false,
rsaKey.Modulus,
rsaKey.PublicExponent);
connection_state = CS_SERVER_CERTIFICATE_RECEIVED;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_FINISHED:
switch (connection_state)
{
case CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED:
/*
* Read the checksum from the finished message,
* it has always 12 bytes.
*/
byte[] receivedChecksum = new byte[12];
TlsUtilities.ReadFully(receivedChecksum, inStr);
AssertEmpty(inStr);
/*
* Calculate our owne checksum.
*/
byte[] checksum = new byte[12];
byte[] md5andsha1 = new byte[16 + 20];
rs.hash2.DoFinal(md5andsha1, 0);
TlsUtilities.PRF(this.ms, TlsUtilities.ToByteArray("server finished"), md5andsha1, checksum);
/*
* Compare both checksums.
*/
for (int i = 0; i < receivedChecksum.Length; i++)
{
if (receivedChecksum[i] != checksum[i])
{
/*
* Wrong checksum in the finished message.
*/
this.FailWithError(AL_fatal, AP_handshake_failure);
}
}
connection_state = CS_DONE;
/*
* We are now ready to receive application data.
*/
this.appDataReady = true;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_SERVER_HELLO:
switch (connection_state)
{
case CS_CLIENT_HELLO_SEND:
/*
* Read the server hello message
*/
TlsUtilities.CheckVersion(inStr, this);
/*
* Read the server random
*/
this.serverRandom = new byte[32];
TlsUtilities.ReadFully(this.serverRandom, inStr);
/*
* Currenty, we don't support session ids
*/
short sessionIdLength = TlsUtilities.ReadUint8(inStr);
byte[] sessionId = new byte[sessionIdLength];
TlsUtilities.ReadFully(sessionId, inStr);
/*
* Find out which ciphersuite the server has
* choosen. If we don't support this ciphersuite,
* the TlsCipherSuiteManager will throw an
* exception.
*/
this.choosenCipherSuite = TlsCipherSuiteManager.GetCipherSuite(
TlsUtilities.ReadUint16(inStr), this);
/*
* We support only the null compression which
* means no compression.
*/
short compressionMethod = TlsUtilities.ReadUint8(inStr);
if (compressionMethod != 0)
{
this.FailWithError(TlsProtocolHandler.AL_fatal, TlsProtocolHandler.AP_illegal_parameter);
}
AssertEmpty(inStr);
connection_state = CS_SERVER_HELLO_RECEIVED;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_SERVER_HELLO_DONE:
switch (connection_state)
{
case CS_SERVER_CERTIFICATE_RECEIVED:
case CS_SERVER_KEY_EXCHANGE_RECEIVED:
// NB: Original code used case label fall-through
if (connection_state == CS_SERVER_CERTIFICATE_RECEIVED)
{
/*
* There was no server key exchange message, check
* that we are doing RSA key exchange.
*/
if (this.choosenCipherSuite.KeyExchangeAlgorithm != TlsCipherSuite.KE_RSA)
{
this.FailWithError(AL_fatal, AP_unexpected_message);
}
}
AssertEmpty(inStr);
connection_state = CS_SERVER_HELLO_DONE_RECEIVED;
/*
* Send the client key exchange message, depending
* on the key exchange we are using in our
* ciphersuite.
*/
short ke = this.choosenCipherSuite.KeyExchangeAlgorithm;
switch (ke)
{
case TlsCipherSuite.KE_RSA:
/*
* We are doing RSA key exchange. We will
* choose a pre master secret and send it
* rsa encrypted to the server.
*
* Prepare pre master secret.
*/
pms = new byte[48];
pms[0] = 3;
pms[1] = 1;
random.NextBytes(pms, 2, 46);
/*
* Encode the pms and send it to the server.
*
* Prepare an Pkcs1Encoding with good random
* padding.
*/
RsaBlindedEngine rsa = new RsaBlindedEngine();
Pkcs1Encoding encoding = new Pkcs1Encoding(rsa);
encoding.Init(true, new ParametersWithRandom(this.serverRsaKey, this.random));
byte[] encrypted = null;
try
{
encrypted = encoding.ProcessBlock(pms, 0, pms.Length);
}
catch (InvalidCipherTextException)
{
/*
* This should never happen, only during decryption.
*/
this.FailWithError(AL_fatal, AP_internal_error);
}
/*
* Send the encrypted pms.
*/
MemoryStream bos = new MemoryStream();
TlsUtilities.WriteUint8(HP_CLIENT_KEY_EXCHANGE, bos);
TlsUtilities.WriteUint24(encrypted.Length + 2, bos);
TlsUtilities.WriteUint16(encrypted.Length, bos);
bos.Write(encrypted, 0, encrypted.Length);
byte[] message = bos.ToArray();
rs.WriteMessage((short)RL_HANDSHAKE, message, 0, message.Length);
break;
case TlsCipherSuite.KE_DHE_RSA:
/*
* Send the Client Key Exchange message for
* DHE key exchange.
*/
byte[] YcByte = this.Yc.ToByteArray();
MemoryStream DHbos = new MemoryStream();
TlsUtilities.WriteUint8(HP_CLIENT_KEY_EXCHANGE, DHbos);
TlsUtilities.WriteUint24(YcByte.Length + 2, DHbos);
TlsUtilities.WriteUint16(YcByte.Length, DHbos);
DHbos.Write(YcByte, 0, YcByte.Length);
byte[] DHmessage = DHbos.ToArray();
rs.WriteMessage((short)RL_HANDSHAKE, DHmessage, 0, DHmessage.Length);
break;
default:
/*
* Proble during handshake, we don't know
* how to thandle this key exchange method.
*/
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
connection_state = CS_CLIENT_KEY_EXCHANGE_SEND;
/*
* Now, we send change cipher state
*/
byte[] cmessage = new byte[1];
cmessage[0] = 1;
rs.WriteMessage((short)RL_CHANGE_CIPHER_SPEC, cmessage, 0, cmessage.Length);
connection_state = CS_CLIENT_CHANGE_CIPHER_SPEC_SEND;
/*
* Calculate the ms
*/
this.ms = new byte[48];
byte[] randBytes = new byte[clientRandom.Length + serverRandom.Length];
Array.Copy(clientRandom, 0, randBytes, 0, clientRandom.Length);
Array.Copy(serverRandom, 0, randBytes, clientRandom.Length, serverRandom.Length);
TlsUtilities.PRF(pms, TlsUtilities.ToByteArray("master secret"), randBytes, this.ms);
/*
* Initialize our cipher suite
*/
rs.writeSuite = this.choosenCipherSuite;
rs.writeSuite.Init(this.ms, clientRandom, serverRandom);
/*
* Send our finished message.
*/
byte[] checksum = new byte[12];
byte[] md5andsha1 = new byte[16 + 20];
rs.hash1.DoFinal(md5andsha1, 0);
TlsUtilities.PRF(this.ms, TlsUtilities.ToByteArray("client finished"), md5andsha1, checksum);
MemoryStream bos2 = new MemoryStream();
TlsUtilities.WriteUint8(HP_FINISHED, bos2);
TlsUtilities.WriteUint24(12, bos2);
bos2.Write(checksum, 0, checksum.Length);
byte[] message2 = bos2.ToArray();
rs.WriteMessage((short)RL_HANDSHAKE, message2, 0, message2.Length);
this.connection_state = CS_CLIENT_FINISHED_SEND;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_handshake_failure);
break;
}
break;
case HP_SERVER_KEY_EXCHANGE:
switch (connection_state)
{
case CS_SERVER_CERTIFICATE_RECEIVED:
/*
* Check that we are doing DHE key exchange
*/
if (this.choosenCipherSuite.KeyExchangeAlgorithm != TlsCipherSuite.KE_DHE_RSA)
{
this.FailWithError(AL_fatal, AP_unexpected_message);
}
/*
* Parse the Structure
*/
int pLength = TlsUtilities.ReadUint16(inStr);
byte[] pByte = new byte[pLength];
TlsUtilities.ReadFully(pByte, inStr);
int gLength = TlsUtilities.ReadUint16(inStr);
byte[] gByte = new byte[gLength];
TlsUtilities.ReadFully(gByte, inStr);
int YsLength = TlsUtilities.ReadUint16(inStr);
byte[] YsByte = new byte[YsLength];
TlsUtilities.ReadFully(YsByte, inStr);
int sigLength = TlsUtilities.ReadUint16(inStr);
byte[] sigByte = new byte[sigLength];
TlsUtilities.ReadFully(sigByte, inStr);
this.AssertEmpty(inStr);
/*
* Verify the Signature.
*
* First, calculate the hash.
*/
CombinedHash sigDigest = new CombinedHash();
MemoryStream signedData = new MemoryStream();
TlsUtilities.WriteUint16(pLength, signedData);
signedData.Write(pByte, 0, pByte.Length);
TlsUtilities.WriteUint16(gLength, signedData);
signedData.Write(gByte, 0, gByte.Length);
TlsUtilities.WriteUint16(YsLength, signedData);
signedData.Write(YsByte, 0, YsByte.Length);
byte[] signed = signedData.ToArray();
sigDigest.BlockUpdate(this.clientRandom, 0, this.clientRandom.Length);
sigDigest.BlockUpdate(this.serverRandom, 0, this.serverRandom.Length);
sigDigest.BlockUpdate(signed, 0, signed.Length);
byte[] hash = new byte[sigDigest.GetDigestSize()];
sigDigest.DoFinal(hash, 0);
/*
* Now, do the RSA operation
*/
RsaBlindedEngine rsa = new RsaBlindedEngine();
Pkcs1Encoding encoding = new Pkcs1Encoding(rsa);
encoding.Init(false, this.serverRsaKey);
/*
* The data which was signed
*/
byte[] sigHash = null;
try
{
sigHash = encoding.ProcessBlock(sigByte, 0, sigByte.Length);
}
catch (InvalidCipherTextException)
{
this.FailWithError(AL_fatal, AP_bad_certificate);
}
/*
* Check if the data which was signed is equal to
* the hash we calculated.
*/
if (sigHash.Length != hash.Length)
{
this.FailWithError(AL_fatal, AP_bad_certificate);
}
for (int i = 0; i < sigHash.Length; i++)
{
if (sigHash[i] != hash[i])
{
this.FailWithError(AL_fatal, AP_bad_certificate);
}
}
/*
* OK, Signature was correct.
*
* Do the DH calculation.
*/
BigInteger p = new BigInteger(1, pByte);
BigInteger g = new BigInteger(1, gByte);
BigInteger Ys = new BigInteger(1, YsByte);
BigInteger x = new BigInteger(p.BitLength - 1, this.random);
Yc = g.ModPow(x, p);
this.pms = (Ys.ModPow(x, p)).ToByteArray();
/*
* Remove leading zero byte, if present.
*/
if (this.pms[0] == 0)
{
byte[] tmp = new byte[this.pms.Length - 1];
Array.Copy(this.pms, 1, tmp, 0, tmp.Length);
this.pms = tmp;
}
this.connection_state = CS_SERVER_KEY_EXCHANGE_RECEIVED;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_HELLO_REQUEST:
case HP_CLIENT_KEY_EXCHANGE:
case HP_CERTIFICATE_REQUEST:
case HP_CERTIFICATE_VERIFY:
case HP_CLIENT_HELLO:
default:
// We do not support this!
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
}
}
}
while (read);
}
private void processHandshake()
{
bool read;
do
{
read = false;
/*
* We need the first 4 bytes, they contain type and length of
* the message.
*/
if (handshakeQueue.Available >= 4)
{
byte[] beginning = new byte[4];
handshakeQueue.Read(beginning, 0, 4, 0);
MemoryStream bis = new MemoryStream(beginning, false);
short type = TlsUtilities.ReadUint8(bis);
int len = TlsUtilities.ReadUint24(bis);
/*
* Check if we have enough bytes in the buffer to read
* the full message.
*/
if (handshakeQueue.Available >= (len + 4))
{
/*
* Read the message.
*/
byte[] buf = new byte[len];
handshakeQueue.Read(buf, 0, len, 4);
handshakeQueue.RemoveData(len + 4);
/*
* If it is not a finished message, update our hashes
* we prepare for the finish message.
*/
if (type != HP_FINISHED)
{
rs.hash1.BlockUpdate(beginning, 0, 4);
rs.hash2.BlockUpdate(beginning, 0, 4);
rs.hash1.BlockUpdate(buf, 0, len);
rs.hash2.BlockUpdate(buf, 0, len);
}
/*
* Now, parse the message.
*/
MemoryStream inStr = new MemoryStream(buf, false);
/*
* Check the type.
*/
switch (type)
{
case HP_CERTIFICATE:
{
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
{
/*
* Parse the certificates.
*/
Certificate cert = Certificate.Parse(inStr);
AssertEmpty(inStr);
X509CertificateStructure x509Cert = cert.certs[0];
SubjectPublicKeyInfo keyInfo = x509Cert.SubjectPublicKeyInfo;
try
{
this.serverPublicKey = PublicKeyFactory.CreateKey(keyInfo);
}
catch (Exception)
{
this.FailWithError(AL_fatal, AP_unsupported_certificate);
}
// Sanity check the PublicKeyFactory
if (this.serverPublicKey.IsPrivate)
{
this.FailWithError(AL_fatal, AP_internal_error);
}
/*
* Perform various checks per RFC2246 7.4.2
* TODO "Unless otherwise specified, the signing algorithm for the certificate
* must be the same as the algorithm for the certificate key."
*/
switch (this.chosenCipherSuite.KeyExchangeAlgorithm)
{
case TlsCipherSuite.KE_RSA:
if (!(this.serverPublicKey is RsaKeyParameters))
{
this.FailWithError(AL_fatal, AP_certificate_unknown);
}
validateKeyUsage(x509Cert, KeyUsage.KeyEncipherment);
break;
case TlsCipherSuite.KE_DHE_RSA:
case TlsCipherSuite.KE_SRP_RSA:
if (!(this.serverPublicKey is RsaKeyParameters))
{
this.FailWithError(AL_fatal, AP_certificate_unknown);
}
validateKeyUsage(x509Cert, KeyUsage.DigitalSignature);
break;
case TlsCipherSuite.KE_DHE_DSS:
case TlsCipherSuite.KE_SRP_DSS:
if (!(this.serverPublicKey is DsaPublicKeyParameters))
{
this.FailWithError(AL_fatal, AP_certificate_unknown);
}
break;
default:
this.FailWithError(AL_fatal, AP_unsupported_certificate);
break;
}
/*
* Verify them.
*/
if (!this.verifyer.IsValid(cert.GetCerts()))
{
this.FailWithError(AL_fatal, AP_user_canceled);
}
break;
}
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
connection_state = CS_SERVER_CERTIFICATE_RECEIVED;
read = true;
break;
}
case HP_FINISHED:
switch (connection_state)
{
case CS_SERVER_CHANGE_CIPHER_SPEC_RECEIVED:
/*
* Read the checksum from the finished message,
* it has always 12 bytes.
*/
byte[] receivedChecksum = new byte[12];
TlsUtilities.ReadFully(receivedChecksum, inStr);
AssertEmpty(inStr);
/*
* Calculate our own checksum.
*/
byte[] checksum = new byte[12];
byte[] md5andsha1 = new byte[16 + 20];
rs.hash2.DoFinal(md5andsha1, 0);
TlsUtilities.PRF(this.ms, TlsUtilities.ToByteArray("server finished"), md5andsha1, checksum);
/*
* Compare both checksums.
*/
for (int i = 0; i < receivedChecksum.Length; i++)
{
if (receivedChecksum[i] != checksum[i])
{
/*
* Wrong checksum in the finished message.
*/
this.FailWithError(AL_fatal, AP_handshake_failure);
}
}
connection_state = CS_DONE;
/*
* We are now ready to receive application data.
*/
this.appDataReady = true;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_SERVER_HELLO:
switch (connection_state)
{
case CS_CLIENT_HELLO_SEND:
/*
* Read the server hello message
*/
TlsUtilities.CheckVersion(inStr, this);
/*
* Read the server random
*/
this.serverRandom = new byte[32];
TlsUtilities.ReadFully(this.serverRandom, inStr);
/*
* Currently, we don't support session ids
*/
byte[] sessionId = TlsUtilities.ReadOpaque8(inStr);
/*
* Find out which ciphersuite the server has
* chosen. If we don't support this ciphersuite,
* the TlsCipherSuiteManager will throw an
* exception.
*/
this.chosenCipherSuite = TlsCipherSuiteManager.GetCipherSuite(
TlsUtilities.ReadUint16(inStr), this);
/*
* We support only the null compression which
* means no compression.
*/
short compressionMethod = TlsUtilities.ReadUint8(inStr);
if (compressionMethod != 0)
{
this.FailWithError(TlsProtocolHandler.AL_fatal, TlsProtocolHandler.AP_illegal_parameter);
}
/*
* RFC4366 2.2
* The extended server hello message format MAY be sent
* in place of the server hello message when the client
* has requested extended functionality via the extended
* client hello message specified in Section 2.1.
*/
if (extendedClientHello && inStr.Position < inStr.Length)
{
// Process extensions from extended server hello
byte[] extBytes = TlsUtilities.ReadOpaque16(inStr);
// Int32 -> byte[]
Hashtable serverExtensions = new Hashtable();
MemoryStream ext = new MemoryStream(extBytes, false);
while (ext.Position < ext.Length)
{
int extType = TlsUtilities.ReadUint16(ext);
byte[] extValue = TlsUtilities.ReadOpaque16(ext);
serverExtensions[extType] = extValue;
}
// TODO Validate/process serverExtensions (via client?)
// TODO[SRP]
}
/*
* Process any extensions
*/
// TODO[SRP]
// if (inStr.Position < inStr.Length)
// {
// int extensionsLength = TlsUtilities.ReadUint16(inStr);
// byte[] extensions = new byte[extensionsLength];
// TlsUtilities.ReadFully(extensions, inStr);
//
// // TODO Validate/process
// }
AssertEmpty(inStr);
connection_state = CS_SERVER_HELLO_RECEIVED;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
case HP_SERVER_HELLO_DONE:
switch (connection_state)
{
case CS_SERVER_CERTIFICATE_RECEIVED:
case CS_SERVER_KEY_EXCHANGE_RECEIVED:
case CS_CERTIFICATE_REQUEST_RECEIVED:
// NB: Original code used case label fall-through
if (connection_state == CS_SERVER_CERTIFICATE_RECEIVED)
{
/*
* There was no server key exchange message, check
* that we are doing RSA key exchange.
*/
if (this.chosenCipherSuite.KeyExchangeAlgorithm != TlsCipherSuite.KE_RSA)
{
this.FailWithError(AL_fatal, AP_unexpected_message);
}
}
AssertEmpty(inStr);
bool isCertReq = (connection_state == CS_CERTIFICATE_REQUEST_RECEIVED);
connection_state = CS_SERVER_HELLO_DONE_RECEIVED;
if (isCertReq)
{
sendClientCertificate();
}
/*
* Send the client key exchange message, depending
* on the key exchange we are using in our
* ciphersuite.
*/
switch (this.chosenCipherSuite.KeyExchangeAlgorithm)
{
case TlsCipherSuite.KE_RSA:
{
/*
* We are doing RSA key exchange. We will
* choose a pre master secret and send it
* rsa encrypted to the server.
*
* Prepare pre master secret.
*/
pms = new byte[48];
pms[0] = 3;
pms[1] = 1;
random.NextBytes(pms, 2, 46);
/*
* Encode the pms and send it to the server.
*
* Prepare an Pkcs1Encoding with good random
* padding.
*/
RsaBlindedEngine rsa = new RsaBlindedEngine();
Pkcs1Encoding encoding = new Pkcs1Encoding(rsa);
encoding.Init(true, new ParametersWithRandom(this.serverPublicKey, this.random));
byte[] encrypted = null;
try
{
encrypted = encoding.ProcessBlock(pms, 0, pms.Length);
}
catch (InvalidCipherTextException)
{
/*
* This should never happen, only during decryption.
*/
this.FailWithError(AL_fatal, AP_internal_error);
}
/*
* Send the encrypted pms.
*/
sendClientKeyExchange(encrypted);
break;
}
case TlsCipherSuite.KE_DHE_DSS:
case TlsCipherSuite.KE_DHE_RSA:
{
/*
* Send the Client Key Exchange message for
* DHE key exchange.
*/
byte[] YcByte = BigIntegers.AsUnsignedByteArray(this.Yc);
sendClientKeyExchange(YcByte);
break;
}
case TlsCipherSuite.KE_SRP:
case TlsCipherSuite.KE_SRP_RSA:
case TlsCipherSuite.KE_SRP_DSS:
{
/*
* Send the Client Key Exchange message for
* SRP key exchange.
*/
byte[] bytes = BigIntegers.AsUnsignedByteArray(this.SRP_A);
sendClientKeyExchange(bytes);
break;
}
default:
/*
* Problem during handshake, we don't know
* how to handle this key exchange method.
*/
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
connection_state = CS_CLIENT_KEY_EXCHANGE_SEND;
/*
* Now, we send change cipher state
*/
byte[] cmessage = new byte[1];
cmessage[0] = 1;
rs.WriteMessage((short)RL_CHANGE_CIPHER_SPEC, cmessage, 0, cmessage.Length);
connection_state = CS_CLIENT_CHANGE_CIPHER_SPEC_SEND;
/*
* Calculate the ms
*/
this.ms = new byte[48];
byte[] randBytes = new byte[clientRandom.Length + serverRandom.Length];
Array.Copy(clientRandom, 0, randBytes, 0, clientRandom.Length);
Array.Copy(serverRandom, 0, randBytes, clientRandom.Length, serverRandom.Length);
TlsUtilities.PRF(pms, TlsUtilities.ToByteArray("master secret"), randBytes, this.ms);
/*
* Initialize our cipher suite
*/
rs.writeSuite = this.chosenCipherSuite;
rs.writeSuite.Init(this.ms, clientRandom, serverRandom);
/*
* Send our finished message.
*/
byte[] checksum = new byte[12];
byte[] md5andsha1 = new byte[16 + 20];
rs.hash1.DoFinal(md5andsha1, 0);
TlsUtilities.PRF(this.ms, TlsUtilities.ToByteArray("client finished"), md5andsha1, checksum);
MemoryStream bos2 = new MemoryStream();
TlsUtilities.WriteUint8(HP_FINISHED, bos2);
TlsUtilities.WriteUint24(12, bos2);
bos2.Write(checksum, 0, checksum.Length);
byte[] message2 = bos2.ToArray();
rs.WriteMessage((short)RL_HANDSHAKE, message2, 0, message2.Length);
this.connection_state = CS_CLIENT_FINISHED_SEND;
read = true;
break;
default:
this.FailWithError(AL_fatal, AP_handshake_failure);
break;
}
break;
case HP_SERVER_KEY_EXCHANGE:
{
switch (connection_state)
{
case CS_SERVER_HELLO_RECEIVED:
case CS_SERVER_CERTIFICATE_RECEIVED:
{
// NB: Original code used case label fall-through
if (connection_state == CS_SERVER_HELLO_RECEIVED)
{
/*
* There was no server certificate message, check
* that we are doing SRP key exchange.
*/
if (this.chosenCipherSuite.KeyExchangeAlgorithm != TlsCipherSuite.KE_SRP)
{
this.FailWithError(AL_fatal, AP_unexpected_message);
}
}
/*
* Check that we are doing DHE key exchange
*/
switch (this.chosenCipherSuite.KeyExchangeAlgorithm)
{
case TlsCipherSuite.KE_DHE_RSA:
{
processDHEKeyExchange(inStr, new TlsRsaSigner());
break;
}
case TlsCipherSuite.KE_DHE_DSS:
{
processDHEKeyExchange(inStr, new TlsDssSigner());
break;
}
case TlsCipherSuite.KE_SRP:
{
processSRPKeyExchange(inStr, null);
break;
}
case TlsCipherSuite.KE_SRP_RSA:
{
processSRPKeyExchange(inStr, new TlsRsaSigner());
break;
}
case TlsCipherSuite.KE_SRP_DSS:
{
processSRPKeyExchange(inStr, new TlsDssSigner());
break;
}
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
break;
}
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
this.connection_state = CS_SERVER_KEY_EXCHANGE_RECEIVED;
read = true;
break;
}
case HP_CERTIFICATE_REQUEST:
switch (connection_state)
{
case CS_SERVER_CERTIFICATE_RECEIVED:
case CS_SERVER_KEY_EXCHANGE_RECEIVED:
{
// NB: Original code used case label fall-through
if (connection_state == CS_SERVER_CERTIFICATE_RECEIVED)
{
/*
* There was no server key exchange message, check
* that we are doing RSA key exchange.
*/
if (this.chosenCipherSuite.KeyExchangeAlgorithm != TlsCipherSuite.KE_RSA)
{
this.FailWithError(AL_fatal, AP_unexpected_message);
}
}
byte[] types = TlsUtilities.ReadOpaque8(inStr);
byte[] auths = TlsUtilities.ReadOpaque8(inStr);
// TODO Validate/process
AssertEmpty(inStr);
break;
}
default:
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
this.connection_state = CS_CERTIFICATE_REQUEST_RECEIVED;
read = true;
break;
case HP_HELLO_REQUEST:
case HP_CLIENT_KEY_EXCHANGE:
case HP_CERTIFICATE_VERIFY:
case HP_CLIENT_HELLO:
default:
// We do not support this!
this.FailWithError(AL_fatal, AP_unexpected_message);
break;
}
}
}
}
while (read);
}
private static void ReadFromRawKey(string rawKey)
{
Reset();
var encryptedKey = Convert.FromBase64String(Regex.Replace(rawKey, "-+.*?-+", "").Replace("\r", "").Replace("\n", ""));
var cipher = new Pkcs1Encoding(new RsaEngine());
cipher.Init(false, CreateCipherParameters());
var decryptedKey = cipher.ProcessBlock(encryptedKey, 0, encryptedKey.Length);
var licenseInfo = Encoding.UTF8.GetString(decryptedKey).Split('\n');
Product = licenseInfo[0];
Version = licenseInfo[1];
Date = string.Format("20{0}-{1}-{2}", licenseInfo[2].Substring(0, 2), licenseInfo[2].Substring(2, 2), licenseInfo[2].Substring(4, 2));
Id = licenseInfo[3];
Licensee = licenseInfo[4];
Validate();
Properties.Settings.Default.LicenseKey = IsValid() ? rawKey : "";
}
/// <summary>
/// Creates an asymmetric algorithm instance (RSA) with the public key of this instance,
/// ready for encryption
/// </summary>
/// <returns></returns>
public IAsymmetricBlockCipher CreateRSAEncrypter()
{
if (_keyParams.AlgorithmId == TPMAlgorithmId.TPM_ALG_RSA && _keyParams.EncScheme == TPMEncScheme.TPM_ES_RSAESOAEP_SHA1_MGF1)
{
IAsymmetricBlockCipher cipher = new OaepEncoding(new RsaEngine(), new Sha1Digest(), Encoding.ASCII.GetBytes("TCPA"));
RsaKeyParameters parameters =
new RsaKeyParameters( false,
new BigInteger(1, _publicKey.Pubkey),
new BigInteger(1, ((TPMRSAKeyParams)_keyParams.Params).GetExponent()));
cipher.Init(true, parameters);
return cipher;
}
else if (_keyParams.AlgorithmId == TPMAlgorithmId.TPM_ALG_RSA && _keyParams.EncScheme == TPMEncScheme.TPM_ES_RSAESPKCSv15)
{
IAsymmetricBlockCipher cipher = new Pkcs1Encoding(new RsaEngine());
RsaKeyParameters parameters =
new RsaKeyParameters( false,
new BigInteger(1, _publicKey.Pubkey),
new BigInteger(1, ((TPMRSAKeyParams)_keyParams.Params).GetExponent()));
cipher.Init(true, parameters);
return cipher;
}
else
throw new NotSupportedException(string.Format("Algorithm '{0}' with '{1}' is not supported", _keyParams.AlgorithmId, _keyParams.EncScheme));
}
public static IBufferedCipher GetCipher(
string algorithm)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
algorithm = Platform.ToUpperInvariant(algorithm);
{
string aliased = (string) algorithms[algorithm];
if (aliased != null)
algorithm = aliased;
}
IBasicAgreement iesAgreement = null;
if (algorithm == "IES")
{
iesAgreement = new DHBasicAgreement();
}
else if (algorithm == "ECIES")
{
iesAgreement = new ECDHBasicAgreement();
}
if (iesAgreement != null)
{
return new BufferedIesCipher(
new IesEngine(
iesAgreement,
new Kdf2BytesGenerator(
new Sha1Digest()),
new HMac(
new Sha1Digest())));
}
if (algorithm.StartsWith("PBE"))
{
if (algorithm.EndsWith("-CBC"))
{
if (algorithm == "PBEWITHSHA1ANDDES-CBC")
{
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEngine()));
}
else if (algorithm == "PBEWITHSHA1ANDRC2-CBC")
{
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine()));
}
else if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND2-KEYTRIPLEDES-CBC", "PBEWITHSHAAND3-KEYTRIPLEDES-CBC"))
{
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEdeEngine()));
}
else if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND128BITRC2-CBC", "PBEWITHSHAAND40BITRC2-CBC"))
{
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine()));
}
}
else if (algorithm.EndsWith("-BC") || algorithm.EndsWith("-OPENSSL"))
{
if (Strings.IsOneOf(algorithm,
"PBEWITHSHAAND128BITAES-CBC-BC",
"PBEWITHSHAAND192BITAES-CBC-BC",
"PBEWITHSHAAND256BITAES-CBC-BC",
"PBEWITHSHA256AND128BITAES-CBC-BC",
"PBEWITHSHA256AND192BITAES-CBC-BC",
"PBEWITHSHA256AND256BITAES-CBC-BC",
"PBEWITHMD5AND128BITAES-CBC-OPENSSL",
"PBEWITHMD5AND192BITAES-CBC-OPENSSL",
"PBEWITHMD5AND256BITAES-CBC-OPENSSL"))
{
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new AesFastEngine()));
}
}
}
string[] parts = algorithm.Split('/');
IBlockCipher blockCipher = null;
IAsymmetricBlockCipher asymBlockCipher = null;
IStreamCipher streamCipher = null;
string algorithmName = parts[0];
{
string aliased = (string)algorithms[algorithmName];
if (aliased != null)
algorithmName = aliased;
}
CipherAlgorithm cipherAlgorithm;
try
{
cipherAlgorithm = (CipherAlgorithm)Enums.GetEnumValue(typeof(CipherAlgorithm), algorithmName);
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
switch (cipherAlgorithm)
{
case CipherAlgorithm.AES:
blockCipher = new AesFastEngine();
break;
case CipherAlgorithm.ARC4:
streamCipher = new RC4Engine();
break;
case CipherAlgorithm.BLOWFISH:
blockCipher = new BlowfishEngine();
break;
case CipherAlgorithm.CAMELLIA:
blockCipher = new CamelliaEngine();
break;
case CipherAlgorithm.CAST5:
blockCipher = new Cast5Engine();
break;
case CipherAlgorithm.CAST6:
blockCipher = new Cast6Engine();
break;
case CipherAlgorithm.DES:
blockCipher = new DesEngine();
break;
case CipherAlgorithm.DESEDE:
blockCipher = new DesEdeEngine();
break;
case CipherAlgorithm.ELGAMAL:
asymBlockCipher = new ElGamalEngine();
break;
case CipherAlgorithm.GOST28147:
blockCipher = new Gost28147Engine();
break;
case CipherAlgorithm.HC128:
streamCipher = new HC128Engine();
break;
case CipherAlgorithm.HC256:
streamCipher = new HC256Engine();
break;
case CipherAlgorithm.IDEA:
blockCipher = new IdeaEngine();
break;
case CipherAlgorithm.NOEKEON:
blockCipher = new NoekeonEngine();
break;
case CipherAlgorithm.PBEWITHSHAAND128BITRC4:
case CipherAlgorithm.PBEWITHSHAAND40BITRC4:
streamCipher = new RC4Engine();
break;
case CipherAlgorithm.RC2:
blockCipher = new RC2Engine();
break;
case CipherAlgorithm.RC5:
blockCipher = new RC532Engine();
break;
case CipherAlgorithm.RC5_64:
blockCipher = new RC564Engine();
break;
case CipherAlgorithm.RC6:
blockCipher = new RC6Engine();
break;
case CipherAlgorithm.RIJNDAEL:
blockCipher = new RijndaelEngine();
break;
case CipherAlgorithm.RSA:
asymBlockCipher = new RsaBlindedEngine();
break;
case CipherAlgorithm.SALSA20:
streamCipher = new Salsa20Engine();
break;
case CipherAlgorithm.SEED:
blockCipher = new SeedEngine();
break;
case CipherAlgorithm.SERPENT:
blockCipher = new SerpentEngine();
break;
case CipherAlgorithm.SKIPJACK:
blockCipher = new SkipjackEngine();
break;
case CipherAlgorithm.TEA:
blockCipher = new TeaEngine();
break;
case CipherAlgorithm.TWOFISH:
blockCipher = new TwofishEngine();
break;
case CipherAlgorithm.VMPC:
streamCipher = new VmpcEngine();
break;
case CipherAlgorithm.VMPC_KSA3:
streamCipher = new VmpcKsa3Engine();
break;
case CipherAlgorithm.XTEA:
blockCipher = new XteaEngine();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
if (streamCipher != null)
{
if (parts.Length > 1)
throw new ArgumentException("Modes and paddings not used for stream ciphers");
return new BufferedStreamCipher(streamCipher);
}
bool cts = false;
bool padded = true;
IBlockCipherPadding padding = null;
IAeadBlockCipher aeadBlockCipher = null;
if (parts.Length > 2)
{
if (streamCipher != null)
throw new ArgumentException("Paddings not used for stream ciphers");
string paddingName = parts[2];
CipherPadding cipherPadding;
if (paddingName == "")
{
cipherPadding = CipherPadding.RAW;
}
else if (paddingName == "X9.23PADDING")
{
cipherPadding = CipherPadding.X923PADDING;
}
else
{
try
{
cipherPadding = (CipherPadding)Enums.GetEnumValue(typeof(CipherPadding), paddingName);
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
switch (cipherPadding)
{
case CipherPadding.NOPADDING:
padded = false;
break;
case CipherPadding.RAW:
break;
case CipherPadding.ISO10126PADDING:
case CipherPadding.ISO10126D2PADDING:
case CipherPadding.ISO10126_2PADDING:
padding = new ISO10126d2Padding();
break;
case CipherPadding.ISO7816_4PADDING:
case CipherPadding.ISO9797_1PADDING:
padding = new ISO7816d4Padding();
break;
case CipherPadding.ISO9796_1:
case CipherPadding.ISO9796_1PADDING:
asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher);
break;
case CipherPadding.OAEP:
case CipherPadding.OAEPPADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher);
break;
case CipherPadding.OAEPWITHMD5ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest());
break;
case CipherPadding.OAEPWITHSHA1ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_1ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest());
break;
case CipherPadding.OAEPWITHSHA224ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_224ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest());
break;
case CipherPadding.OAEPWITHSHA256ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_256ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest());
break;
case CipherPadding.OAEPWITHSHA384ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_384ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest());
break;
case CipherPadding.OAEPWITHSHA512ANDMGF1PADDING:
case CipherPadding.OAEPWITHSHA_512ANDMGF1PADDING:
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest());
break;
case CipherPadding.PKCS1:
case CipherPadding.PKCS1PADDING:
asymBlockCipher = new Pkcs1Encoding(asymBlockCipher);
break;
case CipherPadding.PKCS5:
case CipherPadding.PKCS5PADDING:
case CipherPadding.PKCS7:
case CipherPadding.PKCS7PADDING:
padding = new Pkcs7Padding();
break;
case CipherPadding.TBCPADDING:
padding = new TbcPadding();
break;
case CipherPadding.WITHCTS:
cts = true;
break;
case CipherPadding.X923PADDING:
padding = new X923Padding();
break;
case CipherPadding.ZEROBYTEPADDING:
padding = new ZeroBytePadding();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
string mode = "";
if (parts.Length > 1)
{
mode = parts[1];
int di = GetDigitIndex(mode);
string modeName = di >= 0 ? mode.Substring(0, di) : mode;
try
{
CipherMode cipherMode = modeName == ""
? CipherMode.NONE
: (CipherMode)Enums.GetEnumValue(typeof(CipherMode), modeName);
switch (cipherMode)
{
case CipherMode.ECB:
case CipherMode.NONE:
break;
case CipherMode.CBC:
blockCipher = new CbcBlockCipher(blockCipher);
break;
case CipherMode.CCM:
aeadBlockCipher = new CcmBlockCipher(blockCipher);
break;
case CipherMode.CFB:
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new CfbBlockCipher(blockCipher, bits);
break;
}
case CipherMode.CTR:
blockCipher = new SicBlockCipher(blockCipher);
break;
case CipherMode.CTS:
cts = true;
blockCipher = new CbcBlockCipher(blockCipher);
break;
case CipherMode.EAX:
aeadBlockCipher = new EaxBlockCipher(blockCipher);
break;
case CipherMode.GCM:
aeadBlockCipher = new GcmBlockCipher(blockCipher);
break;
case CipherMode.GOFB:
blockCipher = new GOfbBlockCipher(blockCipher);
break;
case CipherMode.OCB:
aeadBlockCipher = new OcbBlockCipher(blockCipher, CreateBlockCipher(cipherAlgorithm));
break;
case CipherMode.OFB:
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new OfbBlockCipher(blockCipher, bits);
break;
}
case CipherMode.OPENPGPCFB:
blockCipher = new OpenPgpCfbBlockCipher(blockCipher);
break;
case CipherMode.SIC:
if (blockCipher.GetBlockSize() < 16)
{
throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)");
}
blockCipher = new SicBlockCipher(blockCipher);
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
catch (ArgumentException)
{
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
if (aeadBlockCipher != null)
{
if (cts)
throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers.");
if (padded && parts.Length > 2 && parts[2] != "")
throw new SecurityUtilityException("Bad padding specified for AEAD cipher.");
return new BufferedAeadBlockCipher(aeadBlockCipher);
}
if (blockCipher != null)
{
if (cts)
{
return new CtsBlockCipher(blockCipher);
}
if (padding != null)
{
return new PaddedBufferedBlockCipher(blockCipher, padding);
}
if (!padded || blockCipher.IsPartialBlockOkay)
{
return new BufferedBlockCipher(blockCipher);
}
return new PaddedBufferedBlockCipher(blockCipher);
}
if (asymBlockCipher != null)
{
return new BufferedAsymmetricBlockCipher(asymBlockCipher);
}
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
public static IBufferedCipher GetCipher(
string algorithm)
{
if (algorithm == null)
throw new ArgumentNullException("algorithm");
algorithm = algorithm.ToUpper(CultureInfo.InvariantCulture);
string aliased = (string) algorithms[algorithm];
if (aliased != null)
algorithm = aliased;
IBasicAgreement iesAgreement = null;
if (algorithm == "IES")
{
iesAgreement = new DHBasicAgreement();
}
else if (algorithm == "ECIES")
{
iesAgreement = new ECDHBasicAgreement();
}
if (iesAgreement != null)
{
return new BufferedIesCipher(
new IesEngine(
iesAgreement,
new Kdf2BytesGenerator(
new Sha1Digest()),
new HMac(
new Sha1Digest())));
}
if (algorithm.StartsWith("PBE"))
{
switch (algorithm)
{
case "PBEWITHSHAAND2-KEYTRIPLEDES-CBC":
case "PBEWITHSHAAND3-KEYTRIPLEDES-CBC":
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEdeEngine()));
case "PBEWITHSHAAND128BITRC2-CBC":
case "PBEWITHSHAAND40BITRC2-CBC":
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine()));
case "PBEWITHSHAAND128BITAES-CBC-BC":
case "PBEWITHSHAAND192BITAES-CBC-BC":
case "PBEWITHSHAAND256BITAES-CBC-BC":
case "PBEWITHSHA256AND128BITAES-CBC-BC":
case "PBEWITHSHA256AND192BITAES-CBC-BC":
case "PBEWITHSHA256AND256BITAES-CBC-BC":
case "PBEWITHMD5AND128BITAES-CBC-OPENSSL":
case "PBEWITHMD5AND192BITAES-CBC-OPENSSL":
case "PBEWITHMD5AND256BITAES-CBC-OPENSSL":
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new AesFastEngine()));
case "PBEWITHSHA1ANDDES-CBC":
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new DesEngine()));
case "PBEWITHSHA1ANDRC2-CBC":
return new PaddedBufferedBlockCipher(
new CbcBlockCipher(new RC2Engine()));
}
}
string[] parts = algorithm.Split('/');
IBlockCipher blockCipher = null;
IAsymmetricBlockCipher asymBlockCipher = null;
IStreamCipher streamCipher = null;
switch (parts[0])
{
case "AES":
blockCipher = new AesFastEngine();
break;
case "ARC4":
streamCipher = new RC4Engine();
break;
case "BLOWFISH":
blockCipher = new BlowfishEngine();
break;
case "CAMELLIA":
blockCipher = new CamelliaEngine();
break;
case "CAST5":
blockCipher = new Cast5Engine();
break;
case "CAST6":
blockCipher = new Cast6Engine();
break;
case "DES":
blockCipher = new DesEngine();
break;
case "DESEDE":
blockCipher = new DesEdeEngine();
break;
case "ELGAMAL":
asymBlockCipher = new ElGamalEngine();
break;
case "GOST28147":
blockCipher = new Gost28147Engine();
break;
case "HC128":
streamCipher = new HC128Engine();
break;
case "HC256":
streamCipher = new HC256Engine();
break;
#if INCLUDE_IDEA
case "IDEA":
blockCipher = new IdeaEngine();
break;
#endif
case "NOEKEON":
blockCipher = new NoekeonEngine();
break;
case "PBEWITHSHAAND128BITRC4":
case "PBEWITHSHAAND40BITRC4":
streamCipher = new RC4Engine();
break;
case "RC2":
blockCipher = new RC2Engine();
break;
case "RC5":
blockCipher = new RC532Engine();
break;
case "RC5-64":
blockCipher = new RC564Engine();
break;
case "RC6":
blockCipher = new RC6Engine();
break;
case "RIJNDAEL":
blockCipher = new RijndaelEngine();
break;
case "RSA":
asymBlockCipher = new RsaBlindedEngine();
break;
case "SALSA20":
streamCipher = new Salsa20Engine();
break;
case "SEED":
blockCipher = new SeedEngine();
break;
case "SERPENT":
blockCipher = new SerpentEngine();
break;
case "SKIPJACK":
blockCipher = new SkipjackEngine();
break;
case "TEA":
blockCipher = new TeaEngine();
break;
case "TWOFISH":
blockCipher = new TwofishEngine();
break;
case "VMPC":
streamCipher = new VmpcEngine();
break;
case "VMPC-KSA3":
streamCipher = new VmpcKsa3Engine();
break;
case "XTEA":
blockCipher = new XteaEngine();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
if (streamCipher != null)
{
if (parts.Length > 1)
throw new ArgumentException("Modes and paddings not used for stream ciphers");
return new BufferedStreamCipher(streamCipher);
}
bool cts = false;
bool padded = true;
IBlockCipherPadding padding = null;
IAeadBlockCipher aeadBlockCipher = null;
if (parts.Length > 2)
{
if (streamCipher != null)
throw new ArgumentException("Paddings not used for stream ciphers");
switch (parts[2])
{
case "NOPADDING":
padded = false;
break;
case "":
case "RAW":
break;
case "ISO10126PADDING":
case "ISO10126D2PADDING":
case "ISO10126-2PADDING":
padding = new ISO10126d2Padding();
break;
case "ISO7816-4PADDING":
case "ISO9797-1PADDING":
padding = new ISO7816d4Padding();
break;
case "ISO9796-1":
case "ISO9796-1PADDING":
asymBlockCipher = new ISO9796d1Encoding(asymBlockCipher);
break;
case "OAEP":
case "OAEPPADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher);
break;
case "OAEPWITHMD5ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new MD5Digest());
break;
case "OAEPWITHSHA1ANDMGF1PADDING":
case "OAEPWITHSHA-1ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha1Digest());
break;
case "OAEPWITHSHA224ANDMGF1PADDING":
case "OAEPWITHSHA-224ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha224Digest());
break;
case "OAEPWITHSHA256ANDMGF1PADDING":
case "OAEPWITHSHA-256ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha256Digest());
break;
case "OAEPWITHSHA384ANDMGF1PADDING":
case "OAEPWITHSHA-384ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha384Digest());
break;
case "OAEPWITHSHA512ANDMGF1PADDING":
case "OAEPWITHSHA-512ANDMGF1PADDING":
asymBlockCipher = new OaepEncoding(asymBlockCipher, new Sha512Digest());
break;
case "PKCS1":
case "PKCS1PADDING":
asymBlockCipher = new Pkcs1Encoding(asymBlockCipher);
break;
case "PKCS5":
case "PKCS5PADDING":
case "PKCS7":
case "PKCS7PADDING":
padding = new Pkcs7Padding();
break;
case "TBCPADDING":
padding = new TbcPadding();
break;
case "WITHCTS":
cts = true;
break;
case "X9.23PADDING":
case "X923PADDING":
padding = new X923Padding();
break;
case "ZEROBYTEPADDING":
padding = new ZeroBytePadding();
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
string mode = "";
if (parts.Length > 1)
{
mode = parts[1];
int di = GetDigitIndex(mode);
string modeName = di >= 0 ? mode.Substring(0, di) : mode;
switch (modeName)
{
case "":
case "ECB":
case "NONE":
break;
case "CBC":
blockCipher = new CbcBlockCipher(blockCipher);
break;
case "CCM":
aeadBlockCipher = new CcmBlockCipher(blockCipher);
break;
case "CFB":
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new CfbBlockCipher(blockCipher, bits);
break;
}
case "CTR":
blockCipher = new SicBlockCipher(blockCipher);
break;
case "CTS":
cts = true;
blockCipher = new CbcBlockCipher(blockCipher);
break;
case "EAX":
aeadBlockCipher = new EaxBlockCipher(blockCipher);
break;
case "GCM":
aeadBlockCipher = new GcmBlockCipher(blockCipher);
break;
case "GOFB":
blockCipher = new GOfbBlockCipher(blockCipher);
break;
case "OFB":
{
int bits = (di < 0)
? 8 * blockCipher.GetBlockSize()
: int.Parse(mode.Substring(di));
blockCipher = new OfbBlockCipher(blockCipher, bits);
break;
}
case "OPENPGPCFB":
blockCipher = new OpenPgpCfbBlockCipher(blockCipher);
break;
case "SIC":
if (blockCipher.GetBlockSize() < 16)
{
throw new ArgumentException("Warning: SIC-Mode can become a twotime-pad if the blocksize of the cipher is too small. Use a cipher with a block size of at least 128 bits (e.g. AES)");
}
blockCipher = new SicBlockCipher(blockCipher);
break;
default:
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
}
if (aeadBlockCipher != null)
{
if (cts)
throw new SecurityUtilityException("CTS mode not valid for AEAD ciphers.");
if (padded && parts.Length > 2 && parts[2] != "")
throw new SecurityUtilityException("Bad padding specified for AEAD cipher.");
return new BufferedAeadBlockCipher(aeadBlockCipher);
}
if (blockCipher != null)
{
if (cts)
{
return new CtsBlockCipher(blockCipher);
}
if (padding != null)
{
return new PaddedBufferedBlockCipher(blockCipher, padding);
}
if (!padded || blockCipher.IsPartialBlockOkay)
{
return new BufferedBlockCipher(blockCipher);
}
return new PaddedBufferedBlockCipher(blockCipher);
}
if (asymBlockCipher != null)
{
return new BufferedAsymmetricBlockCipher(asymBlockCipher);
}
throw new SecurityUtilityException("Cipher " + algorithm + " not recognised.");
}
/// <summary>
/// Answers the message.
/// </summary>
/// <param name='messageStream'>Message stream.</param>
/// <param name="process">The calling process or <c>null</c> if the process
/// could not be obtained.</param>
/// <remarks>code based on winpgnt.c from PuTTY source code</remarks>
public void AnswerMessage(Stream messageStream, Process process = null)
{
if (messageStream.CanTimeout) {
messageStream.ReadTimeout = 5000;
}
var messageParser = new BlobParser(messageStream);
var responseBuilder = new BlobBuilder();
BlobHeader header;
try {
header = messageParser.ReadHeader();
if (MessageReceived != null) {
var eventArgs = new MessageReceivedEventArgs(header);
MessageReceived(this, eventArgs);
if (eventArgs.Fail) {
throw new Exception ();
}
}
} catch (Exception) {
header = new BlobHeader();
header.Message = Message.UNKNOWN;
// this will cause the switch statement below to use the default case
// which returns an error to the stream.
}
switch (header.Message) {
case Message.SSH1_AGENTC_REQUEST_RSA_IDENTITIES:
/*
* Reply with SSH1_AGENT_RSA_IDENTITIES_ANSWER.
*/
try {
if (header.BlobLength > 1) {
// ruby net-ssh tries to send a SSH2_AGENT_REQUEST_VERSION message
// which has the same id number as SSH1_AGENTC_REQUEST_RSA_IDENTITIES
// with a string tacked on. We need to read the string from the
// stream, but it is not used for anything.
messageParser.ReadString ();
}
var keyList = ListKeys(SshVersion.SSH1);
if (FilterKeyListCallback != null) {
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList) {
responseBuilder.AddBytes(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_REQUEST_IDENTITIES:
/*
* Reply with SSH2_AGENT_IDENTITIES_ANSWER.
*/
try {
var keyList = ListKeys(SshVersion.SSH2);
if (FilterKeyListCallback != null) {
keyList = FilterKeyListCallback(keyList);
}
foreach (SshKey key in keyList) {
responseBuilder.AddBlob(key.GetPublicKeyBlob());
responseBuilder.AddStringBlob(key.Comment);
}
responseBuilder.InsertHeader(Message.SSH2_AGENT_IDENTITIES_ANSWER,
keyList.Count);
// TODO may want to check that there is enough room in the message stream
break; // succeeded
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_RSA_CHALLENGE:
/*
* Reply with either SSH1_AGENT_RSA_RESPONSE or
* SSH_AGENT_FAILURE, depending on whether we have that key
* or not.
*/
try {
//Reading publicKey information
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(true);
//Searching for Key here
var matchingKey = mKeyList.Where(key => key.Version == SshVersion.SSH1
&& (key.GetPublicKeyParameters().Equals(publicKeyParams))).Single();
//Reading challenge
var encryptedChallenge = messageParser.ReadSsh1BigIntBlob();
var sessionId = messageParser.ReadBytes(16);
//Checking responseType field
if (messageParser.ReadInt() != 1) {
goto default; //responseType !=1 is not longer supported
}
//Answering to the challenge
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(false /* decrypt */, matchingKey.GetPrivateKeyParameters());
var decryptedChallenge = engine.ProcessBlock(encryptedChallenge,
0, encryptedChallenge.Length);
using (MD5 md5 = MD5.Create()) {
var md5Buffer = new byte[48];
decryptedChallenge.CopyTo(md5Buffer, 0);
sessionId.CopyTo(md5Buffer, 32);
responseBuilder.AddBytes(md5.ComputeHash(md5Buffer));
responseBuilder.InsertHeader(Message.SSH1_AGENT_RSA_RESPONSE);
break;
}
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_SIGN_REQUEST:
/*
* Reply with either SSH2_AGENT_SIGN_RESPONSE or SSH_AGENT_FAILURE,
* depending on whether we have that key or not.
*/
try {
var keyBlob = messageParser.ReadBlob();
var reqData = messageParser.ReadBlob();
var flags = new SignRequestFlags();
try {
// usually, there are no flags, so parser will throw
flags = (SignRequestFlags)messageParser.ReadInt();
} catch { }
var matchingKey =
mKeyList.Where(key => key.Version == SshVersion.SSH2 &&
key.GetPublicKeyBlob().SequenceEqual(keyBlob)).First();
var confirmConstraints = matchingKey.Constraints
.Where(constraint => constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_CONFIRM);
if (confirmConstraints.Count() > 0) {
if (!ConfirmUserPermissionCallback.Invoke(matchingKey, process)) {
goto default;
}
}
/* create signature */
var signKey = matchingKey;
var signer = signKey.GetSigner();
var algName = signKey.Algorithm.GetIdentifierString();
signer.Init(true, signKey.GetPrivateKeyParameters());
signer.BlockUpdate(reqData, 0, reqData.Length);
byte[] signature = signer.GenerateSignature();
signature = signKey.FormatSignature(signature);
BlobBuilder signatureBuilder = new BlobBuilder();
if (!flags.HasFlag(SignRequestFlags.SSH_AGENT_OLD_SIGNATURE)) {
signatureBuilder.AddStringBlob(algName);
}
signatureBuilder.AddBlob(signature);
responseBuilder.AddBlob(signatureBuilder.GetBlob());
responseBuilder.InsertHeader(Message.SSH2_AGENT_SIGN_RESPONSE);
try {
KeyUsed(this, new KeyUsedEventArgs(signKey, process));
} catch { }
break; // succeeded
} catch (InvalidOperationException) {
// this is expected if there is not a matching key
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failure
case Message.SSH1_AGENTC_ADD_RSA_IDENTITY:
case Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked) {
goto default;
}
bool ssh1constrained = (header.Message == Message.SSH1_AGENTC_ADD_RSA_ID_CONSTRAINED);
try {
var publicKeyParams = messageParser.ReadSsh1PublicKeyData(false);
var keyPair = messageParser.ReadSsh1KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH1, keyPair);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (ssh1constrained) {
while (messageStream.Position < header.BlobLength + 4) {
KeyConstraint constraint = new KeyConstraint();
constraint.Type = (KeyConstraintType)messageParser.ReadByte();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME) {
constraint.Data = messageParser.ReadInt();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH2_AGENTC_ADD_IDENTITY:
case Message.SSH2_AGENTC_ADD_ID_CONSTRAINED:
/*
* Add to the list and return SSH_AGENT_SUCCESS, or
* SSH_AGENT_FAILURE if the key was malformed.
*/
if (IsLocked) {
goto default;
}
bool constrained = (header.Message ==
Message.SSH2_AGENTC_ADD_ID_CONSTRAINED);
try {
var publicKeyParams = messageParser.ReadSsh2PublicKeyData();
var keyPair = messageParser.ReadSsh2KeyData(publicKeyParams);
SshKey key = new SshKey(SshVersion.SSH2, keyPair);
key.Comment = messageParser.ReadString();
key.Source = "External client";
if (constrained) {
while (messageStream.Position < header.BlobLength + 4) {
KeyConstraint constraint = new KeyConstraint();
constraint.Type =
(KeyConstraintType)messageParser.ReadByte();
if (constraint.Type ==
KeyConstraintType.SSH_AGENT_CONSTRAIN_LIFETIME) {
constraint.Data = messageParser.ReadInt();
}
key.AddConstraint(constraint);
}
}
AddKey(key);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; // success!
} catch (CallbackNullException) {
// this is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY:
case Message.SSH2_AGENTC_REMOVE_IDENTITY:
/*
* Remove from the list and return SSH_AGENT_SUCCESS, or
* perhaps SSH_AGENT_FAILURE if it wasn't in the list to
* start with.
*/
if (IsLocked) {
goto default;
}
SshVersion removeVersion;
byte[] rKeyBlob;
if (header.Message == Message.SSH1_AGENTC_REMOVE_RSA_IDENTITY) {
removeVersion = SshVersion.SSH1;
rKeyBlob = messageParser.ReadBytes(header.BlobLength - 1);
} else if (header.Message == Message.SSH2_AGENTC_REMOVE_IDENTITY) {
removeVersion = SshVersion.SSH2;
rKeyBlob = messageParser.ReadBlob();
} else {
Debug.Fail("Should not get here.");
goto default;
}
try {
var matchingKey = mKeyList.Get(removeVersion, rKeyBlob);
var startKeyListLength = mKeyList.Count;
RemoveKey(matchingKey);
// only succeed if key was removed
if (mKeyList.Count == startKeyListLength - 1) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
}
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES:
case Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES:
/*
* Remove all SSH-1 or SSH-2 keys.
*/
if (IsLocked) {
goto default;
}
SshVersion removeAllVersion;
if (header.Message == Message.SSH1_AGENTC_REMOVE_ALL_RSA_IDENTITIES) {
removeAllVersion = SshVersion.SSH1;
} else if (header.Message == Message.SSH2_AGENTC_REMOVE_ALL_IDENTITIES) {
removeAllVersion = SshVersion.SSH2;
} else {
Debug.Fail("Should not get here.");
goto default;
}
try {
RemoveAllKeys(removeAllVersion);
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break; //success!
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default; // failed
case Message.SSH_AGENTC_LOCK:
try {
var passphrase = new PinnedArray<byte>(messageParser.ReadBlob());
try {
Lock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (IsLocked) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
case Message.SSH_AGENTC_UNLOCK:
try {
var passphrase = new PinnedArray<byte>(messageParser.ReadBlob());
try {
Unlock(passphrase.Data);
} finally {
passphrase.Clear();
}
if (!IsLocked) {
responseBuilder.InsertHeader(Message.SSH_AGENT_SUCCESS);
break;
}
} catch (AgentLockedException) {
// This is expected
} catch (PassphraseException) {
// This is expected
} catch (Exception ex) {
Debug.Fail(ex.ToString());
}
goto default;
default:
responseBuilder.Clear();
responseBuilder.InsertHeader(Message.SSH_AGENT_FAILURE);
break;
}
/* write response to stream */
if (messageStream.CanSeek)
messageStream.Position = 0;
messageStream.Write(responseBuilder.GetBlob(), 0, responseBuilder.Length);
messageStream.Flush();
}
private string EncryptDESKey()
{
var pemReader = new PemReader(_clientKeys.AbenityPublicKeyFileStream);
var key = (AsymmetricKeyParameter)pemReader.ReadObject();
var engine = new Pkcs1Encoding(new RsaEngine());
engine.Init(true, key);
var data = engine.ProcessBlock(_desKey, 0, _desKey.Length);
return Utility.UrlEncode(Utility.Base64String(data)) + "decode";
}
