/// <summary>Add a PBE encryption method to the encrypted object.</summary>
/// <remarks>
/// The passphrase is encoded to bytes using UTF8 (Encoding.UTF8.GetBytes).
/// </remarks>
public void AddMethodUtf8(char[] passPhrase, HashAlgorithmTag s2kDigest)
{
DoAddMethod(PgpUtilities.EncodePassPhrase(passPhrase, true), true, s2kDigest);
}
internal void DoAddMethod(byte[] rawPassPhrase, bool clearPassPhrase, HashAlgorithmTag s2kDigest)
{
S2k s2k = PgpUtilities.GenerateS2k(s2kDigest, 0x60, rand);
methods.Add(new PbeMethod(defAlgorithm, s2k, PgpUtilities.DoMakeKeyFromPassPhrase(defAlgorithm, s2k, rawPassPhrase, clearPassPhrase)));
}
private byte[] RecoverSessionData(PgpPrivateKey privKey)
{
byte[][] secKeyData = keyData.GetEncSessionKey();
if (keyData.Algorithm == PublicKeyAlgorithmTag.ECDH)
{
ECDHPublicBcpgKey ecKey = (ECDHPublicBcpgKey)privKey.PublicKeyPacket.Key;
X9ECParameters x9Params = ECKeyPairGenerator.FindECCurveByOid(ecKey.CurveOid);
byte[] enc = secKeyData[0];
int pLen = ((((enc[0] & 0xff) << 8) + (enc[1] & 0xff)) + 7) / 8;
byte[] pEnc = new byte[pLen];
Array.Copy(enc, 2, pEnc, 0, pLen);
byte[] keyEnc = new byte[enc[pLen + 2]];
Array.Copy(enc, 2 + pLen + 1, keyEnc, 0, keyEnc.Length);
ECPoint publicPoint = x9Params.Curve.DecodePoint(pEnc);
ECPrivateKeyParameters privKeyParams = (ECPrivateKeyParameters)privKey.Key;
ECPoint S = publicPoint.Multiply(privKeyParams.D).Normalize();
KeyParameter key = new KeyParameter(Rfc6637Utilities.CreateKey(privKey.PublicKeyPacket, S));
IWrapper w = PgpUtilities.CreateWrapper(ecKey.SymmetricKeyAlgorithm);
w.Init(false, key);
return(PgpPad.UnpadSessionData(w.Unwrap(keyEnc, 0, keyEnc.Length)));
}
IBufferedCipher cipher = GetKeyCipher(keyData.Algorithm);
try
{
cipher.Init(false, privKey.Key);
}
catch (InvalidKeyException e)
{
throw new PgpException("error setting asymmetric cipher", e);
}
if (keyData.Algorithm == PublicKeyAlgorithmTag.RsaEncrypt ||
keyData.Algorithm == PublicKeyAlgorithmTag.RsaGeneral)
{
byte[] bi = secKeyData[0];
cipher.ProcessBytes(bi, 2, bi.Length - 2);
}
else
{
ElGamalPrivateKeyParameters k = (ElGamalPrivateKeyParameters)privKey.Key;
int size = (k.Parameters.P.BitLength + 7) / 8;
ProcessEncodedMpi(cipher, size, secKeyData[0]);
ProcessEncodedMpi(cipher, size, secKeyData[1]);
}
try
{
return(cipher.DoFinal());
}
catch (Exception e)
{
throw new PgpException("exception decrypting secret key", e);
}
}
public PgpSecretKey(int certificationLevel, PgpKeyPair keyPair, string id, SymmetricKeyAlgorithmTag encAlgorithm, HashAlgorithmTag hashAlgorithm, bool utf8PassPhrase, char[] passPhrase, bool useSha1, PgpSignatureSubpacketVector hashedPackets, PgpSignatureSubpacketVector unhashedPackets, SecureRandom rand)
: this(certificationLevel, keyPair, id, encAlgorithm, hashAlgorithm, PgpUtilities.EncodePassPhrase(passPhrase, utf8PassPhrase), clearPassPhrase : true, useSha1, hashedPackets, unhashedPackets, rand)
{
}
/// <summary>Return the decrypted input stream, using the passed in passphrase.</summary>
public Stream GetDataStream(
char[] passPhrase)
{
try
{
SymmetricKeyAlgorithmTag keyAlgorithm = keyData.EncAlgorithm;
KeyParameter key = PgpUtilities.MakeKeyFromPassPhrase(
keyAlgorithm, keyData.S2k, passPhrase);
byte[] secKeyData = keyData.GetSecKeyData();
if (secKeyData != null && secKeyData.Length > 0)
{
IBufferedCipher keyCipher = CipherUtilities.GetCipher(
PgpUtilities.GetSymmetricCipherName(keyAlgorithm) + "/CFB/NoPadding");
keyCipher.Init(false,
new ParametersWithIV(key, new byte[keyCipher.GetBlockSize()]));
byte[] keyBytes = keyCipher.DoFinal(secKeyData);
keyAlgorithm = (SymmetricKeyAlgorithmTag)keyBytes[0];
key = ParameterUtilities.CreateKeyParameter(
PgpUtilities.GetSymmetricCipherName(keyAlgorithm),
keyBytes, 1, keyBytes.Length - 1);
}
IBufferedCipher c = CreateStreamCipher(keyAlgorithm);
byte[] iv = new byte[c.GetBlockSize()];
c.Init(false, new ParametersWithIV(key, iv));
encStream = BcpgInputStream.Wrap(new CipherStream(encData.GetInputStream(), c, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
encStream = new DigestStream(truncStream, digest, null);
}
if (Streams.ReadFully(encStream, iv, 0, iv.Length) < iv.Length)
{
throw new EndOfStreamException("unexpected end of stream.");
}
int v1 = encStream.ReadByte();
int v2 = encStream.ReadByte();
if (v1 < 0 || v2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
// Note: the oracle attack on the "quick check" bytes is not deemed
// a security risk for PBE (see PgpPublicKeyEncryptedData)
bool repeatCheckPassed =
iv[iv.Length - 2] == (byte)v1 &&
iv[iv.Length - 1] == (byte)v2;
// Note: some versions of PGP appear to produce 0 for the extra
// bytes rather than repeating the two previous bytes
bool zeroesCheckPassed =
v1 == 0 &&
v2 == 0;
if (!repeatCheckPassed && !zeroesCheckPassed)
{
throw new PgpDataValidationException("quick check failed.");
}
return(encStream);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
}
private byte[] EncryptSessionInfo(byte[] sessionInfo, SecureRandom random)
{
if (pubKey.Algorithm != PublicKeyAlgorithmTag.ECDH)
{
IBufferedCipher c;
switch (pubKey.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaGeneral:
c = CipherUtilities.GetCipher("RSA//PKCS1Padding");
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
c = CipherUtilities.GetCipher("ElGamal/ECB/PKCS1Padding");
break;
case PublicKeyAlgorithmTag.Dsa:
throw new PgpException("Can't use DSA for encryption.");
case PublicKeyAlgorithmTag.ECDsa:
throw new PgpException("Can't use ECDSA for encryption.");
default:
throw new PgpException("unknown asymmetric algorithm: " + pubKey.Algorithm);
}
AsymmetricKeyParameter akp = pubKey.GetKey();
c.Init(true, new ParametersWithRandom(akp, random));
return(c.DoFinal(sessionInfo));
}
ECDHPublicBcpgKey ecKey = (ECDHPublicBcpgKey)pubKey.PublicKeyPacket.Key;
// Generate the ephemeral key pair
IAsymmetricCipherKeyPairGenerator gen = GeneratorUtilities.GetKeyPairGenerator("ECDH");
gen.Init(new ECKeyGenerationParameters(ecKey.CurveOid, random));
AsymmetricCipherKeyPair ephKp = gen.GenerateKeyPair();
ECPrivateKeyParameters ephPriv = (ECPrivateKeyParameters)ephKp.Private;
ECPublicKeyParameters ephPub = (ECPublicKeyParameters)ephKp.Public;
ECPublicKeyParameters pub = (ECPublicKeyParameters)pubKey.GetKey();
ECPoint S = pub.Q.Multiply(ephPriv.D).Normalize();
KeyParameter key = new KeyParameter(Rfc6637Utilities.CreateKey(pubKey.PublicKeyPacket, S));
IWrapper w = PgpUtilities.CreateWrapper(ecKey.SymmetricKeyAlgorithm);
w.Init(true, new ParametersWithRandom(key, random));
byte[] paddedSessionData = PgpPad.PadSessionData(sessionInfo);
byte[] C = w.Wrap(paddedSessionData, 0, paddedSessionData.Length);
byte[] VB = new MPInteger(new BigInteger(1, ephPub.Q.GetEncoded(false))).GetEncoded();
byte[] rv = new byte[VB.Length + 1 + C.Length];
Array.Copy(VB, 0, rv, 0, VB.Length);
rv[VB.Length] = (byte)C.Length;
Array.Copy(C, 0, rv, VB.Length + 1, C.Length);
return(rv);
}
/// <summary>Return a signature object containing the current signature state.</summary>
public PgpSignature Generate()
{
ISignatureSubpacket[] hPkts = _hashed, unhPkts = _unhashed;
if (!PacketPresent(_hashed, SignatureSubpacketTag.CreationTime))
{
hPkts = InsertSubpacket(hPkts, new SignatureCreationTime(false, DateTime.UtcNow));
}
if (!PacketPresent(_hashed, SignatureSubpacketTag.IssuerKeyId) &&
!PacketPresent(_unhashed, SignatureSubpacketTag.IssuerKeyId))
{
unhPkts = InsertSubpacket(unhPkts, new IssuerKeyId(false, _privKey.KeyId));
}
const int version = 4;
byte[] hData;
try
{
using (var hOut = new MemoryStream())
{
for (var i = 0; i != hPkts.Length; i++)
{
hPkts[i].Encode(hOut);
}
var data = hOut.ToArray();
using (var sOut = new MemoryStream(data.Length + 6))
{
sOut.WriteByte(version);
sOut.WriteByte((byte)_signatureType);
sOut.WriteByte((byte)_keyAlgorithm);
sOut.WriteByte((byte)_hashAlgorithm);
sOut.WriteByte((byte)(data.Length >> 8));
sOut.WriteByte((byte)data.Length);
sOut.Write(data, 0, data.Length);
hData = sOut.ToArray();
}
}
}
catch (IOException e)
{
throw new PgpException("exception encoding hashed data.", e);
}
_sig.BlockUpdate(hData, 0, hData.Length);
_dig.BlockUpdate(hData, 0, hData.Length);
hData = new byte[]
{
version,
0xff,
(byte)(hData.Length >> 24),
(byte)(hData.Length >> 16),
(byte)(hData.Length >> 8),
(byte)hData.Length
};
_sig.BlockUpdate(hData, 0, hData.Length);
_dig.BlockUpdate(hData, 0, hData.Length);
var sigBytes = _sig.GenerateSignature();
var digest = DigestUtilities.DoFinal(_dig);
var fingerPrint = new[] { digest[0], digest[1] };
// an RSA signature
var isRsa = _keyAlgorithm == PublicKeyAlgorithmTag.RsaSign ||
_keyAlgorithm == PublicKeyAlgorithmTag.RsaGeneral;
var sigValues = isRsa
? PgpUtilities.RsaSigToMpi(sigBytes)
: PgpUtilities.DsaSigToMpi(sigBytes);
return(new PgpSignature(new SignaturePacket(_signatureType, _privKey.KeyId, _keyAlgorithm, _hashAlgorithm, hPkts, unhPkts, fingerPrint, sigValues)));
}
/// <summary>Return a signature object containing the current signature state.</summary>
public PgpSignature Generate()
{
SignatureSubpacket[] hPkts = hashed, unhPkts = unhashed;
if (!packetPresent(hashed, SignatureSubpacketTag.CreationTime))
{
hPkts = insertSubpacket(hPkts, new SignatureCreationTime(false, DateTime.UtcNow));
}
if (!packetPresent(hashed, SignatureSubpacketTag.IssuerKeyId) &&
!packetPresent(unhashed, SignatureSubpacketTag.IssuerKeyId))
{
unhPkts = insertSubpacket(unhPkts, new IssuerKeyId(false, privKey.KeyId));
}
int version = 4;
byte[] hData;
try
{
MemoryStream hOut = new MemoryStream();
for (int i = 0; i != hPkts.Length; i++)
{
hPkts[i].Encode(hOut);
}
byte[] data = hOut.ToArray();
MemoryStream sOut = new MemoryStream(data.Length + 6);
sOut.WriteByte((byte)version);
sOut.WriteByte((byte)signatureType);
sOut.WriteByte((byte)keyAlgorithm);
sOut.WriteByte((byte)hashAlgorithm);
sOut.WriteByte((byte)(data.Length >> 8));
sOut.WriteByte((byte)data.Length);
sOut.Write(data, 0, data.Length);
hData = sOut.ToArray();
}
catch (IOException e)
{
throw new PgpException("exception encoding hashed data.", e);
}
sig.BlockUpdate(hData, 0, hData.Length);
dig.BlockUpdate(hData, 0, hData.Length);
hData = new byte[]
{
(byte)version,
0xff,
(byte)(hData.Length >> 24),
(byte)(hData.Length >> 16),
(byte)(hData.Length >> 8),
(byte)hData.Length
};
sig.BlockUpdate(hData, 0, hData.Length);
dig.BlockUpdate(hData, 0, hData.Length);
byte[] sigBytes = sig.GenerateSignature();
byte[] digest = DigestUtilities.DoFinal(dig);
byte[] fingerPrint = new byte[] { digest[0], digest[1] };
// an RSA signature
bool isRsa = keyAlgorithm == PublicKeyAlgorithmTag.RsaSign ||
keyAlgorithm == PublicKeyAlgorithmTag.RsaGeneral;
MPInteger[] sigValues = isRsa
? PgpUtilities.RsaSigToMpi(sigBytes)
: PgpUtilities.DsaSigToMpi(sigBytes);
return(new PgpSignature(
new SignaturePacket(signatureType, privKey.KeyId, keyAlgorithm,
hashAlgorithm, hPkts, unhPkts, fingerPrint, sigValues)));
}
public static PgpSecretKey ParseSecretKeyFromSExprUtf8(Stream inputStream, char[] passPhrase)
{
return(DoParseSecretKeyFromSExpr(inputStream, PgpUtilities.EncodePassPhrase(passPhrase, utf8: true), clearPassPhrase: true));
}
private byte[] ExtractKeyData(
char[] passPhrase)
{
SymmetricKeyAlgorithmTag encAlgorithm = secret.EncAlgorithm;
byte[] encData = secret.GetSecretKeyData();
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
// TODO Check checksum here?
return(encData);
}
// TODO Factor this block out as 'decryptData'
try
{
KeyParameter key = PgpUtilities.MakeKeyFromPassPhrase(secret.EncAlgorithm, secret.S2k, passPhrase);
byte[] iv = secret.GetIV();
byte[] data;
if (secret.PublicKeyPacket.Version >= 4)
{
data = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iv, encData, 0, encData.Length);
bool useSha1 = secret.S2kUsage == SecretKeyPacket.UsageSha1;
byte[] check = Checksum(useSha1, data, (useSha1) ? data.Length - 20 : data.Length - 2);
for (int i = 0; i != check.Length; i++)
{
if (check[i] != data[data.Length - check.Length + i])
{
throw new PgpException("Checksum mismatch at " + i + " of " + check.Length);
}
}
}
else // version 2 or 3, RSA only.
{
data = new byte[encData.Length];
iv = Arrays.Clone(iv);
//
// read in the four numbers
//
int pos = 0;
for (int i = 0; i != 4; i++)
{
int encLen = (((encData[pos] << 8) | (encData[pos + 1] & 0xff)) + 7) / 8;
data[pos] = encData[pos];
data[pos + 1] = encData[pos + 1];
pos += 2;
byte[] tmp = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iv, encData, pos, encLen);
Array.Copy(tmp, 0, data, pos, encLen);
pos += encLen;
if (i != 3)
{
Array.Copy(encData, pos - iv.Length, iv, 0, iv.Length);
}
}
//
// verify and copy checksum
//
data[pos] = encData[pos];
data[pos + 1] = encData[pos + 1];
int cs = ((encData[pos] << 8) & 0xff00) | (encData[pos + 1] & 0xff);
int calcCs = 0;
for (int j = 0; j < pos; j++)
{
calcCs += data[j] & 0xff;
}
calcCs &= 0xffff;
if (calcCs != cs)
{
throw new PgpException("Checksum mismatch: passphrase wrong, expected "
+ cs.ToString("X")
+ " found " + calcCs.ToString("X"));
}
}
return(data);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception decrypting key", e);
}
}
public static PgpSecretKey CopyWithNewPasswordUtf8(PgpSecretKey key, char[] oldPassPhrase, char[] newPassPhrase, SymmetricKeyAlgorithmTag newEncAlgorithm, SecureRandom rand)
{
return(DoCopyWithNewPassword(key, PgpUtilities.EncodePassPhrase(oldPassPhrase, utf8: true), PgpUtilities.EncodePassPhrase(newPassPhrase, utf8: true), clearPassPhrase: true, newEncAlgorithm, rand));
}
public PgpPrivateKey ExtractPrivateKeyUtf8(char[] passPhrase)
{
return(DoExtractPrivateKey(PgpUtilities.EncodePassPhrase(passPhrase, utf8: true), clearPassPhrase: true));
}
private byte[] ExtractKeyData(byte[] rawPassPhrase, bool clearPassPhrase)
{
SymmetricKeyAlgorithmTag encAlgorithm = secret.EncAlgorithm;
byte[] secretKeyData = secret.GetSecretKeyData();
if (encAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
return(secretKeyData);
}
try
{
KeyParameter key = PgpUtilities.DoMakeKeyFromPassPhrase(secret.EncAlgorithm, secret.S2k, rawPassPhrase, clearPassPhrase);
byte[] iV = secret.GetIV();
byte[] array;
if (secret.PublicKeyPacket.Version >= 4)
{
array = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iV, secretKeyData, 0, secretKeyData.Length);
bool flag = secret.S2kUsage == 254;
byte[] array2 = Checksum(flag, array, flag ? (array.Length - 20) : (array.Length - 2));
for (int i = 0; i != array2.Length; i++)
{
if (array2[i] != array[array.Length - array2.Length + i])
{
throw new PgpException(string.Concat(new object[4] {
"Checksum mismatch at ", i, " of ", array2.Length
}));
}
}
}
else
{
array = new byte[secretKeyData.Length];
iV = Arrays.Clone(iV);
int num = 0;
for (int j = 0; j != 4; j++)
{
int num2 = (((secretKeyData[num] << 8) | (secretKeyData[num + 1] & 0xFF)) + 7) / 8;
array[num] = secretKeyData[num];
array[num + 1] = secretKeyData[num + 1];
num += 2;
byte[] array3 = RecoverKeyData(encAlgorithm, "/CFB/NoPadding", key, iV, secretKeyData, num, num2);
global::System.Array.Copy((global::System.Array)array3, 0, (global::System.Array)array, num, num2);
num += num2;
if (j != 3)
{
global::System.Array.Copy((global::System.Array)secretKeyData, num - iV.Length, (global::System.Array)iV, 0, iV.Length);
}
}
array[num] = secretKeyData[num];
array[num + 1] = secretKeyData[num + 1];
int num3 = ((secretKeyData[num] << 8) & 0xFF00) | (secretKeyData[num + 1] & 0xFF);
int num4 = 0;
for (int k = 0; k < num; k++)
{
num4 += array[k] & 0xFF;
}
num4 &= 0xFFFF;
if (num4 != num3)
{
throw new PgpException("Checksum mismatch: passphrase wrong, expected " + num3.ToString("X") + " found " + num4.ToString("X"));
}
}
return(array);
}
catch (PgpException ex)
{
throw ex;
}
catch (global::System.Exception exception)
{
throw new PgpException("Exception decrypting key", exception);
}
}
/// <summary>Return a signature object containing the current signature state.</summary>
public PgpSignature Generate()
{
MPInteger[] sigValues;
int version = 4;
MemoryStream sOut = new MemoryStream();
// int index = 0;
//
// if (!creationTimeFound)
// {
// hashed[index++] = new SignatureCreationTime(false, DateTime.UtcNow);
// }
//
// if (!issuerKeyIDFound)
// {
// hashed[index++] = new IssuerKeyId(false, privKey.KeyId);
// }
SignatureSubpacket[] hPkts, unhPkts;
if (!packetPresent(hashed, SignatureSubpacketTag.CreationTime))
{
hPkts = insertSubpacket(hashed, new SignatureCreationTime(false, DateTime.UtcNow));
}
else
{
hPkts = hashed;
}
if (!packetPresent(hashed, SignatureSubpacketTag.IssuerKeyId) &&
!packetPresent(unhashed, SignatureSubpacketTag.IssuerKeyId))
{
unhPkts = insertSubpacket(unhashed, new IssuerKeyId(false, privKey.KeyId));
}
else
{
unhPkts = unhashed;
}
try
{
sOut.WriteByte((byte)version);
sOut.WriteByte((byte)signatureType);
sOut.WriteByte((byte)keyAlgorithm);
sOut.WriteByte((byte)hashAlgorithm);
MemoryStream hOut = new MemoryStream();
for (int i = 0; i != hPkts.Length; i++)
{
hPkts[i].Encode(hOut);
}
byte[] data = hOut.ToArray();
sOut.WriteByte((byte)(data.Length >> 8));
sOut.WriteByte((byte)data.Length);
sOut.Write(data, 0, data.Length);
}
catch (IOException e)
{
throw new PgpException("exception encoding hashed data.", e);
}
byte[] hData = sOut.ToArray();
sig.BlockUpdate(hData, 0, hData.Length);
dig.BlockUpdate(hData, 0, hData.Length);
sOut = new MemoryStream();
sOut.WriteByte((byte)version);
sOut.WriteByte((byte)0xff);
sOut.WriteByte((byte)(hData.Length >> 24));
sOut.WriteByte((byte)(hData.Length >> 16));
sOut.WriteByte((byte)(hData.Length >> 8));
sOut.WriteByte((byte)(hData.Length));
hData = sOut.ToArray();
sig.BlockUpdate(hData, 0, hData.Length);
dig.BlockUpdate(hData, 0, hData.Length);
byte[] sigBytes = sig.GenerateSignature();
byte[] digest = DigestUtilities.DoFinal(dig);
byte[] fingerPrint = new byte[] { digest[0], digest[1] };
if (keyAlgorithm == PublicKeyAlgorithmTag.RsaSign ||
keyAlgorithm == PublicKeyAlgorithmTag.RsaGeneral) // an RSA signature
{
sigValues = new MPInteger[] { new MPInteger(new BigInteger(1, sigBytes)) };
}
else
{
sigValues = PgpUtilities.DsaSigToMpi(sigBytes);
}
return(new PgpSignature(
new SignaturePacket(signatureType, privKey.KeyId, keyAlgorithm,
hashAlgorithm, hPkts, unhPkts, fingerPrint, sigValues)));
}
public PgpSignature Generate()
{
//IL_006b: Unknown result type (might be due to invalid IL or missing references)
//IL_0072: Expected O, but got Unknown
//IL_009e: Unknown result type (might be due to invalid IL or missing references)
//IL_00a5: Expected O, but got Unknown
//IL_010c: Expected O, but got Unknown
SignatureSubpacket[] array = hashed;
SignatureSubpacket[] array2 = unhashed;
if (!packetPresent(hashed, SignatureSubpacketTag.CreationTime))
{
array = insertSubpacket(array, new SignatureCreationTime(critical: false, global::System.DateTime.get_UtcNow()));
}
if (!packetPresent(hashed, SignatureSubpacketTag.IssuerKeyId) && !packetPresent(unhashed, SignatureSubpacketTag.IssuerKeyId))
{
array2 = insertSubpacket(array2, new IssuerKeyId(critical: false, privKey.KeyId));
}
int num = 4;
byte[] array4;
try
{
MemoryStream val = new MemoryStream();
for (int i = 0; i != array.Length; i++)
{
array[i].Encode((Stream)(object)val);
}
byte[] array3 = val.ToArray();
MemoryStream val2 = new MemoryStream(array3.Length + 6);
((Stream)val2).WriteByte((byte)num);
((Stream)val2).WriteByte((byte)signatureType);
((Stream)val2).WriteByte((byte)keyAlgorithm);
((Stream)val2).WriteByte((byte)hashAlgorithm);
((Stream)val2).WriteByte((byte)(array3.Length >> 8));
((Stream)val2).WriteByte((byte)array3.Length);
((Stream)val2).Write(array3, 0, array3.Length);
array4 = val2.ToArray();
}
catch (IOException val3)
{
IOException exception = val3;
throw new PgpException("exception encoding hashed data.", (global::System.Exception)(object) exception);
}
sig.BlockUpdate(array4, 0, array4.Length);
dig.BlockUpdate(array4, 0, array4.Length);
array4 = new byte[6]
{
(byte)num,
255,
(byte)(array4.Length >> 24),
(byte)(array4.Length >> 16),
(byte)(array4.Length >> 8),
(byte)array4.Length
};
sig.BlockUpdate(array4, 0, array4.Length);
dig.BlockUpdate(array4, 0, array4.Length);
byte[] encoding = sig.GenerateSignature();
byte[] array5 = DigestUtilities.DoFinal(dig);
byte[] fingerprint = new byte[2]
{
array5[0],
array5[1]
};
MPInteger[] signature = ((keyAlgorithm == PublicKeyAlgorithmTag.RsaSign || keyAlgorithm == PublicKeyAlgorithmTag.RsaGeneral) ? PgpUtilities.RsaSigToMpi(encoding) : PgpUtilities.DsaSigToMpi(encoding));
return(new PgpSignature(new SignaturePacket(signatureType, privKey.KeyId, keyAlgorithm, hashAlgorithm, array, array2, fingerprint, signature)));
}
private byte[] ExtractKeyData(
char[] passPhrase)
{
SymmetricKeyAlgorithmTag alg = secret.EncAlgorithm;
byte[] encData = secret.GetSecretKeyData();
if (alg == SymmetricKeyAlgorithmTag.Null)
{
return(encData);
}
byte[] data;
IBufferedCipher c = null;
try
{
string cName = PgpUtilities.GetSymmetricCipherName(alg);
c = CipherUtilities.GetCipher(cName + "/CFB/NoPadding");
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
// TODO Factor this block out as 'encryptData'
try
{
KeyParameter key = PgpUtilities.MakeKeyFromPassPhrase(secret.EncAlgorithm, secret.S2k, passPhrase);
byte[] iv = secret.GetIV();
if (secret.PublicKeyPacket.Version == 4)
{
c.Init(false, new ParametersWithIV(key, iv));
data = c.DoFinal(encData);
bool useSha1 = secret.S2kUsage == SecretKeyPacket.UsageSha1;
byte[] check = Checksum(useSha1, data, (useSha1) ? data.Length - 20 : data.Length - 2);
for (int i = 0; i != check.Length; i++)
{
if (check[i] != data[data.Length - check.Length + i])
{
throw new PgpException("Checksum mismatch at " + i + " of " + check.Length);
}
}
}
else // version 2 or 3, RSA only.
{
data = new byte[encData.Length];
//
// read in the four numbers
//
int pos = 0;
for (int i = 0; i != 4; i++)
{
c.Init(false, new ParametersWithIV(key, iv));
int encLen = (((encData[pos] << 8) | (encData[pos + 1] & 0xff)) + 7) / 8;
data[pos] = encData[pos];
data[pos + 1] = encData[pos + 1];
pos += 2;
c.DoFinal(encData, pos, encLen, data, pos);
pos += encLen;
if (i != 3)
{
Array.Copy(encData, pos - iv.Length, iv, 0, iv.Length);
}
}
//
// verify Checksum
//
int cs = ((encData[pos] << 8) & 0xff00) | (encData[pos + 1] & 0xff);
int calcCs = 0;
for (int j = 0; j < data.Length - 2; j++)
{
calcCs += data[j] & 0xff;
}
calcCs &= 0xffff;
if (calcCs != cs)
{
throw new PgpException("Checksum mismatch: passphrase wrong, expected "
+ cs.ToString("X")
+ " found " + calcCs.ToString("X"));
}
}
return(data);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception decrypting key", e);
}
}
internal PgpSecretKey(
PgpKeyPair keyPair,
SymmetricKeyAlgorithmTag encAlgorithm,
char[] passPhrase,
bool useSHA1,
SecureRandom rand)
{
PublicKeyPacket pubPk = keyPair.PublicKey.publicPk;
BcpgObject secKey;
switch (keyPair.PublicKey.Algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaSign:
case PublicKeyAlgorithmTag.RsaGeneral:
RsaPrivateCrtKeyParameters rsK = (RsaPrivateCrtKeyParameters)keyPair.PrivateKey.Key;
secKey = new RsaSecretBcpgKey(rsK.Exponent, rsK.P, rsK.Q);
break;
case PublicKeyAlgorithmTag.Dsa:
DsaPrivateKeyParameters dsK = (DsaPrivateKeyParameters)keyPair.PrivateKey.Key;
secKey = new DsaSecretBcpgKey(dsK.X);
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
ElGamalPrivateKeyParameters esK = (ElGamalPrivateKeyParameters)keyPair.PrivateKey.Key;
secKey = new ElGamalSecretBcpgKey(esK.X);
break;
default:
throw new PgpException("unknown key class");
}
string cName = PgpUtilities.GetSymmetricCipherName(encAlgorithm);
IBufferedCipher c = null;
if (cName != null)
{
try
{
c = CipherUtilities.GetCipher(cName + "/CFB/NoPadding");
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
}
try
{
MemoryStream bOut = new MemoryStream();
BcpgOutputStream pOut = new BcpgOutputStream(bOut);
pOut.WriteObject(secKey);
byte[] keyData = bOut.ToArray();
byte[] checksumBytes = Checksum(useSHA1, keyData, keyData.Length);
pOut.Write(checksumBytes);
byte[] bOutData = bOut.ToArray();
if (c != null)
{
byte[] iv = new byte[8];
rand.NextBytes(iv);
S2k s2k = new S2k(HashAlgorithmTag.Sha1, iv, 0x60);
KeyParameter key = PgpUtilities.MakeKeyFromPassPhrase(encAlgorithm, s2k, passPhrase);
iv = new byte[c.GetBlockSize()];
rand.NextBytes(iv);
c.Init(true, new ParametersWithIV(key, iv));
byte[] encData = c.DoFinal(bOutData);
int usage = useSHA1
? SecretKeyPacket.UsageSha1
: SecretKeyPacket.UsageChecksum;
this.secret = new SecretKeyPacket(pubPk, encAlgorithm, usage, s2k, iv, encData);
}
else
{
this.secret = new SecretKeyPacket(pubPk, encAlgorithm, null, null, bOutData);
}
this.trust = null;
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception encrypting key", e);
}
this.keySigs = new ArrayList();
}
private void GetSig()
{
this.sig = SignerUtilities.GetSigner(
PgpUtilities.GetSignatureName(sigPck.KeyAlgorithm, sigPck.HashAlgorithm));
}
/// <summary>
/// Return a copy of the passed in secret key, encrypted using a new password
/// and the passed in algorithm.
/// </summary>
/// <param name="key">The PgpSecretKey to be copied.</param>
/// <param name="oldPassPhrase">The current password for the key.</param>
/// <param name="newPassPhrase">The new password for the key.</param>
/// <param name="newEncAlgorithm">The algorithm to be used for the encryption.</param>
/// <param name="rand">Source of randomness.</param>
public static PgpSecretKey CopyWithNewPassword(
PgpSecretKey key,
char[] oldPassPhrase,
char[] newPassPhrase,
SymmetricKeyAlgorithmTag newEncAlgorithm,
SecureRandom rand)
{
byte[] rawKeyData = key.ExtractKeyData(oldPassPhrase);
int s2kUsage = key.secret.S2kUsage;
byte[] iv = null;
S2k s2k = null;
byte[] keyData = null;
if (newEncAlgorithm == SymmetricKeyAlgorithmTag.Null)
{
s2kUsage = SecretKeyPacket.UsageNone;
if (key.secret.S2kUsage == SecretKeyPacket.UsageSha1) // SHA-1 hash, need to rewrite Checksum
{
keyData = new byte[rawKeyData.Length - 18];
Array.Copy(rawKeyData, 0, keyData, 0, keyData.Length - 2);
byte[] check = Checksum(false, keyData, keyData.Length - 2);
keyData[keyData.Length - 2] = check[0];
keyData[keyData.Length - 1] = check[1];
}
else
{
keyData = rawKeyData;
}
}
else
{
IBufferedCipher c;
try
{
string cName = PgpUtilities.GetSymmetricCipherName(newEncAlgorithm);
c = CipherUtilities.GetCipher(cName + "/CFB/NoPadding");
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
iv = new byte[8];
rand.NextBytes(iv);
s2k = new S2k(HashAlgorithmTag.Sha1, iv, 0x60);
try
{
KeyParameter sKey = PgpUtilities.MakeKeyFromPassPhrase(newEncAlgorithm, s2k, newPassPhrase);
iv = new byte[c.GetBlockSize()];
rand.NextBytes(iv);
c.Init(true, new ParametersWithIV(sKey, iv));
keyData = c.DoFinal(rawKeyData);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception encrypting key", e);
}
}
SecretKeyPacket secret;
if (key.secret is SecretSubkeyPacket)
{
secret = new SecretSubkeyPacket(key.secret.PublicKeyPacket,
newEncAlgorithm, s2kUsage, s2k, iv, keyData);
}
else
{
secret = new SecretKeyPacket(key.secret.PublicKeyPacket,
newEncAlgorithm, s2kUsage, s2k, iv, keyData);
}
if (key.subSigs == null)
{
return(new PgpSecretKey(secret, key.trust, key.keySigs, key.ids,
key.idTrusts, key.idSigs, key.pub));
}
return(new PgpSecretKey(secret, key.trust, key.subSigs, key.pub));
}
/// <summary>Return the decrypted data stream for the packet.</summary>
public Stream GetDataStream(
PgpPrivateKey privKey)
{
IBufferedCipher c1 = GetKeyCipher(keyData.Algorithm);
try
{
c1.Init(false, privKey.Key);
}
catch (InvalidKeyException e)
{
throw new PgpException("error setting asymmetric cipher", e);
}
BigInteger[] keyD = keyData.GetEncSessionKey();
if (keyData.Algorithm == PublicKeyAlgorithmTag.RsaEncrypt ||
keyData.Algorithm == PublicKeyAlgorithmTag.RsaGeneral)
{
byte[] bi = keyD[0].ToByteArray();
if (bi[0] == 0)
{
c1.ProcessBytes(bi, 1, bi.Length - 1);
}
else
{
c1.ProcessBytes(bi, 0, bi.Length);
}
}
else
{
ElGamalPrivateKeyParameters k = (ElGamalPrivateKeyParameters)privKey.Key;
int size = (k.Parameters.P.BitLength + 7) / 8;
byte[] bi = keyD[0].ToByteArray();
int diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
bi = keyD[1].ToByteArray();
diff = bi.Length - size;
if (diff >= 0)
{
c1.ProcessBytes(bi, diff, size);
}
else
{
byte[] zeros = new byte[-diff];
c1.ProcessBytes(zeros);
c1.ProcessBytes(bi);
}
}
byte[] plain;
try
{
plain = c1.DoFinal();
}
catch (Exception e)
{
throw new PgpException("exception decrypting secret key", e);
}
if (!ConfirmCheckSum(plain))
{
throw new PgpKeyValidationException("key checksum failed");
}
IBufferedCipher c2;
string cipherName = PgpUtilities.GetSymmetricCipherName((SymmetricKeyAlgorithmTag)plain[0]);
string cName = cipherName;
try
{
if (encData is SymmetricEncIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c2 = CipherUtilities.GetCipher(cName);
}
// catch (NoSuchProviderException e)
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("exception creating cipher", e);
}
if (c2 == null)
{
return(encData.GetInputStream());
}
try
{
byte[] keyBytes = new byte[plain.Length - 3];
Array.Copy(plain, 1, keyBytes, 0, keyBytes.Length);
KeyParameter key = ParameterUtilities.CreateKeyParameter(
cipherName, keyBytes);
byte[] iv = new byte[c2.GetBlockSize()];
c2.Init(false, new ParametersWithIV(key, iv));
encStream = BcpgInputStream.Wrap(new CipherStream(encData.GetInputStream(), c2, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
encStream = new DigestStream(truncStream,
DigestUtilities.GetDigest(PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1)), null);
}
for (int i = 0; i != iv.Length; i++)
{
int ch = encStream.ReadByte();
if (ch < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
iv[i] = (byte)ch;
}
int v1 = encStream.ReadByte();
int v2 = encStream.ReadByte();
if (v1 < 0 || v2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
// Note: the oracle attack on the "quick check" bytes is deemed
// a security risk for typical public key encryption usages,
// therefore we do not perform the check.
// bool repeatCheckPassed =
// iv[iv.Length - 2] == (byte)v1
// && iv[iv.Length - 1] == (byte)v2;
//
// // Note: some versions of PGP appear to produce 0 for the extra
// // bytes rather than repeating the two previous bytes
// bool zeroesCheckPassed =
// v1 == 0
// && v2 == 0;
//
// if (!repeatCheckPassed && !zeroesCheckPassed)
// {
// throw new PgpDataValidationException("quick check failed.");
// }
return(encStream);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception starting decryption", e);
}
}
/// <summary>
/// Gets the data stream.
/// </summary>
/// <param name="privKey">The priv key.</param>
/// <param name="encryptionAlgorithm">The encryption algorithm.</param>
/// <returns></returns>
/// <exception cref="Org.BouncyCastle.Bcpg.OpenPgp.PgpException">
/// exception creating cipher
/// or
/// Exception starting decryption
/// </exception>
/// <exception cref="System.IO.EndOfStreamException">
/// unexpected end of stream.
/// or
/// unexpected end of stream.
/// </exception>
public Stream GetDataStream(IPgpPrivateKey privKey, out SymmetricKeyAlgorithmTag encryptionAlgorithm)
{
var plain = this.FetchSymmetricKeyData(privKey);
encryptionAlgorithm = (SymmetricKeyAlgorithmTag)plain[0];
IBufferedCipher c2;
var cipherName = PgpUtilities.GetSymmetricCipherName(encryptionAlgorithm);
var cName = cipherName;
try
{
if (EncData is SymmetricEncIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c2 = CipherUtilities.GetCipher(cName);
}
catch (PgpException)
{
throw;
}
catch (Exception e)
{
throw new PgpException("exception creating cipher", e);
}
if (c2 == null)
{
return(EncData.GetInputStream());
}
try
{
var key = ParameterUtilities.CreateKeyParameter(cipherName, plain, 1, plain.Length - 3);
var iv = new byte[c2.GetBlockSize()];
c2.Init(false, new ParametersWithIV(key, iv));
this.EncStream = BcpgInputStream.Wrap(new CipherStream(EncData.GetInputStream(), c2, null));
if (this.EncData is SymmetricEncIntegrityPacket)
{
this.TruncStream = new TruncatedStream(this.EncStream);
var digest = DigestUtilities.GetDigest(PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1));
EncStream = new DigestStream(TruncStream, digest, null);
}
if (Streams.ReadFully(EncStream, iv, 0, iv.Length) < iv.Length)
{
throw new EndOfStreamException("unexpected end of stream.");
}
var v1 = this.EncStream.ReadByte();
var v2 = this.EncStream.ReadByte();
if (v1 < 0 || v2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
// Note: the oracle attack on the "quick check" bytes is deemed
// a security risk for typical public key encryption usages,
// therefore we do not perform the check.
// bool repeatCheckPassed =
// iv[iv.Length - 2] == (byte)v1
// && iv[iv.Length - 1] == (byte)v2;
//
// // Note: some versions of PGP appear to produce 0 for the extra
// // bytes rather than repeating the two previous bytes
// bool zeroesCheckPassed =
// v1 == 0
// && v2 == 0;
//
// if (!repeatCheckPassed && !zeroesCheckPassed)
// {
// throw new PgpDataValidationException("quick check failed.");
// }
return(this.EncStream);
}
catch (PgpException)
{
throw;
}
catch (Exception e)
{
throw new PgpException("Exception starting decryption", e);
}
}
/// <summary>
/// <p>
/// If buffer is non null stream assumed to be partial, otherwise the length will be used
/// to output a fixed length packet.
/// </p>
/// <p>
/// The stream created can be closed off by either calling Close()
/// on the stream or Close() on the generator. Closing the returned
/// stream does not close off the Stream parameter <c>outStr</c>.
/// </p>
/// </summary>
private Stream Open(
Stream outStr,
long length,
byte[] buffer)
{
if (cOut != null)
{
throw new InvalidOperationException("generator already in open state");
}
if (methods.Count == 0)
{
throw new InvalidOperationException("No encryption methods specified");
}
if (outStr == null)
{
throw new ArgumentNullException("outStr");
}
pOut = new BcpgOutputStream(outStr);
KeyParameter key;
if (methods.Count == 1)
{
if (methods[0] is PbeMethod)
{
PbeMethod m = (PbeMethod)methods[0];
key = m.GetKey();
}
else
{
key = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] sessionInfo = CreateSessionInfo(defAlgorithm, key);
PubMethod m = (PubMethod)methods[0];
try
{
m.AddSessionInfo(sessionInfo, rand);
}
catch (Exception e)
{
throw new PgpException("exception encrypting session key", e);
}
}
pOut.WritePacket((ContainedPacket)methods[0]);
}
else // multiple methods
{
key = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] sessionInfo = CreateSessionInfo(defAlgorithm, key);
for (int i = 0; i != methods.Count; i++)
{
EncMethod m = (EncMethod)methods[i];
try
{
m.AddSessionInfo(sessionInfo, rand);
}
catch (Exception e)
{
throw new PgpException("exception encrypting session key", e);
}
pOut.WritePacket(m);
}
}
string cName = PgpUtilities.GetSymmetricCipherName(defAlgorithm);
if (cName == null)
{
throw new PgpException("null cipher specified");
}
try
{
if (withIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c = CipherUtilities.GetCipher(cName);
// TODO Confirm the IV should be all zero bytes (not inLineIv - see below)
byte[] iv = new byte[c.GetBlockSize()];
c.Init(true, new ParametersWithRandom(new ParametersWithIV(key, iv), rand));
if (buffer == null)
{
//
// we have to Add block size + 2 for the Generated IV and + 1 + 22 if integrity protected
//
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, length + c.GetBlockSize() + 2 + 1 + 22);
pOut.WriteByte(1); // version number
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, length + c.GetBlockSize() + 2, oldFormat);
}
}
else
{
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, buffer);
pOut.WriteByte(1); // version number
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, buffer);
}
}
int blockSize = c.GetBlockSize();
byte[] inLineIv = new byte[blockSize + 2];
rand.NextBytes(inLineIv, 0, blockSize);
Array.Copy(inLineIv, inLineIv.Length - 4, inLineIv, inLineIv.Length - 2, 2);
Stream myOut = cOut = new CipherStream(pOut, null, c);
if (withIntegrityPacket)
{
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
myOut = digestOut = new DigestStream(myOut, null, digest);
}
myOut.Write(inLineIv, 0, inLineIv.Length);
return(new WrappedGeneratorStream(this, myOut));
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
}
public Stream GetDataStream(PgpPrivateKey privKey)
{
//IL_012b: Unknown result type (might be due to invalid IL or missing references)
//IL_015a: Unknown result type (might be due to invalid IL or missing references)
byte[] array = RecoverSessionData(privKey);
if (!ConfirmCheckSum(array))
{
throw new PgpKeyValidationException("key checksum failed");
}
SymmetricKeyAlgorithmTag symmetricKeyAlgorithmTag = (SymmetricKeyAlgorithmTag)array[0];
if (symmetricKeyAlgorithmTag == SymmetricKeyAlgorithmTag.Null)
{
return((Stream)(object)encData.GetInputStream());
}
string symmetricCipherName = PgpUtilities.GetSymmetricCipherName(symmetricKeyAlgorithmTag);
string text = symmetricCipherName;
IBufferedCipher cipher;
try
{
text = ((!(encData is SymmetricEncIntegrityPacket)) ? (text + "/OpenPGPCFB/NoPadding") : (text + "/CFB/NoPadding"));
cipher = CipherUtilities.GetCipher(text);
}
catch (PgpException ex)
{
throw ex;
}
catch (global::System.Exception exception)
{
throw new PgpException("exception creating cipher", exception);
}
try
{
KeyParameter parameters = ParameterUtilities.CreateKeyParameter(symmetricCipherName, array, 1, array.Length - 3);
byte[] array2 = new byte[cipher.GetBlockSize()];
cipher.Init(forEncryption: false, new ParametersWithIV(parameters, array2));
encStream = (Stream)(object)BcpgInputStream.Wrap((Stream)(object)new CipherStream((Stream)(object)encData.GetInputStream(), cipher, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
encStream = (Stream)(object)new DigestStream((Stream)(object)truncStream, digest, null);
}
if (Streams.ReadFully(encStream, array2, 0, array2.Length) < array2.Length)
{
throw new EndOfStreamException("unexpected end of stream.");
}
int num = encStream.ReadByte();
int num2 = encStream.ReadByte();
if (num < 0 || num2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
return(encStream);
}
catch (PgpException ex2)
{
throw ex2;
}
catch (global::System.Exception exception2)
{
throw new PgpException("Exception starting decryption", exception2);
}
}
/// <summary>Return the decrypted data stream for the packet.</summary>
public Stream GetDataStream(
PgpPrivateKey privKey)
{
byte[] sessionData = RecoverSessionData(privKey);
if (!ConfirmCheckSum(sessionData))
{
throw new PgpKeyValidationException("key checksum failed");
}
SymmetricKeyAlgorithmTag symmAlg = (SymmetricKeyAlgorithmTag)sessionData[0];
if (symmAlg == SymmetricKeyAlgorithmTag.Null)
{
return(encData.GetInputStream());
}
IBufferedCipher cipher;
string cipherName = PgpUtilities.GetSymmetricCipherName(symmAlg);
string cName = cipherName;
try
{
if (encData is SymmetricEncIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
cipher = CipherUtilities.GetCipher(cName);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("exception creating cipher", e);
}
try
{
KeyParameter key = ParameterUtilities.CreateKeyParameter(
cipherName, sessionData, 1, sessionData.Length - 3);
byte[] iv = new byte[cipher.GetBlockSize()];
cipher.Init(false, new ParametersWithIV(key, iv));
encStream = BcpgInputStream.Wrap(new CipherStream(encData.GetInputStream(), cipher, null));
if (encData is SymmetricEncIntegrityPacket)
{
truncStream = new TruncatedStream(encStream);
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
encStream = new DigestStream(truncStream, digest, null);
}
if (Streams.ReadFully(encStream, iv, 0, iv.Length) < iv.Length)
{
throw new EndOfStreamException("unexpected end of stream.");
}
int v1 = encStream.ReadByte();
int v2 = encStream.ReadByte();
if (v1 < 0 || v2 < 0)
{
throw new EndOfStreamException("unexpected end of stream.");
}
// Note: the oracle attack on the "quick check" bytes is deemed
// a security risk for typical public key encryption usages,
// therefore we do not perform the check.
// bool repeatCheckPassed =
// iv[iv.Length - 2] == (byte)v1
// && iv[iv.Length - 1] == (byte)v2;
//
// // Note: some versions of PGP appear to produce 0 for the extra
// // bytes rather than repeating the two previous bytes
// bool zeroesCheckPassed =
// v1 == 0
// && v2 == 0;
//
// if (!repeatCheckPassed && !zeroesCheckPassed)
// {
// throw new PgpDataValidationException("quick check failed.");
// }
return(encStream);
}
catch (PgpException e)
{
throw e;
}
catch (Exception e)
{
throw new PgpException("Exception starting decryption", e);
}
}
public PgpKeyRingGenerator(int certificationLevel, PgpKeyPair masterKey, string id, SymmetricKeyAlgorithmTag encAlgorithm, HashAlgorithmTag hashAlgorithm, bool utf8PassPhrase, char[] passPhrase, bool useSha1, PgpSignatureSubpacketVector hashedPackets, PgpSignatureSubpacketVector unhashedPackets, SecureRandom rand)
: this(certificationLevel, masterKey, id, encAlgorithm, hashAlgorithm, PgpUtilities.EncodePassPhrase(passPhrase, utf8PassPhrase), useSha1, hashedPackets, unhashedPackets, rand)
{
}
