/// <summary>
/// Encrypt dataToEncrypt using the specified encodingParams (RSA only).
/// </summary>
/// <param name="plainText"></param>
/// <param name="label"></param>
/// <returns></returns>
public byte[] EncryptOaep(byte[] plainText, byte[] label)
{
if (plainText == null)
{
plainText = new byte[0];
}
if (label == null)
{
label = new byte[0];
}
#if TSS_USE_BCRYPT
var paddingInfo = new BCryptOaepPaddingInfo(OaepHash, label);
byte[] cipherText = Key.Encrypt(plainText, paddingInfo);
#elif false
var rr = new RawRsa(RsaProvider.ExportParameters(false), RsaProvider.KeySize);
byte[] cipherText = rr.OaepEncrypt(plainText, OaepHash, label);
#else
RSAParameters parms = RsaProvider.ExportParameters(false);
var alg = new BCryptAlgorithm(Native.BCRYPT_RSA_ALGORITHM);
var key = alg.LoadRSAKey(parms.Exponent, parms.Modulus);
var paddingInfo = new BCryptOaepPaddingInfo(OaepHash, label);
byte[] cipherText = key.Encrypt(plainText, paddingInfo);
key.Destroy();
alg.Close();
#endif
return(cipherText);
}
internal static BCryptKey Generate(string algName, uint numBits)
{
var alg = new BCryptAlgorithm(algName);
var key = alg.GenerateKeyPair(numBits);
alg.Close();
return(key);
}
public static byte[] Decrypt(byte[] bytes, Dictionary <ulong, Smb2CryptoInfo> cryptoInfoTable, Smb2Role role)
{
// Client: If the size of the message received from the server is not greater than the size of SMB2 TRANSFORM_HEADER as specified, the client MUST discard the message.
// Server: If the size of the message received from the client is not greater than the size of the SMB2 TRANSFORM_HEADER, the server MUST disconnect the connection.
int minimumLength = Marshal.SizeOf(typeof(Transform_Header));
if (bytes.Length < minimumLength)
{
throw new InvalidOperationException(
String.Format(
"Too less data for encrypted message. Expected length more than {0}, actual {1}.",
minimumLength,
bytes.Length
)
);
}
Transform_Header transformHeader = Smb2Utility.UnmarshalStructure <Transform_Header>(bytes);
// Client: If the Flags/EncryptionAlgorithm in the SMB2 TRANSFORM_HEADER is not 0x0001, the client MUST discard the message.
// Server: If the Flags/EncryptionAlgorithm in the SMB2 TRANSFORM_HEADER is not 0x0001, the server MUST disconnect the connection.
if (transformHeader.Flags != TransformHeaderFlags.Encrypted)
{
throw new InvalidOperationException(
String.Format(
"Flags/EncryptionAlgorithm field is invalid for encrypted message. Expected value 0x0001, actual {0}.",
(ushort)transformHeader.Flags
)
);
}
if (transformHeader.SessionId == 0 || !cryptoInfoTable.ContainsKey(transformHeader.SessionId))
{
throw new InvalidOperationException("Invalid SessionId in TRANSFORM_HEADER.");
}
Smb2CryptoInfo cryptoInfo = cryptoInfoTable[transformHeader.SessionId];
using (var bcrypt = new BCryptAlgorithm("AES"))
{
int nonceLength = 0;
BCryptCipherMode mode = BCryptCipherMode.NotAvailable;
GetCryptoParams(cryptoInfo, CryptoOperationType.Decrypt, out mode, out nonceLength);
bcrypt.Mode = mode;
bcrypt.Key = role == Smb2Role.Server ? cryptoInfo.ServerInKey : cryptoInfo.ServerOutKey;
return(bcrypt.Decrypt(bytes.Skip(52).ToArray(), transformHeader.Nonce.ToByteArray().Take(nonceLength).ToArray(), bytes.Skip(20).Take(32).ToArray(), transformHeader.Signature));
}
}
public static byte[] HmacData(TpmAlgId hashAlgId, byte[] key, byte[] dataToHash)
{
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(hashAlgId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw <ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return(null);
}
var alg = new BCryptAlgorithm(algName, Native.BCRYPT_ALG_HANDLE_HMAC);
var digest = alg.HmacData(key, dataToHash);
alg.Close();
return(digest);
#else
switch (hashAlgId)
{
case TpmAlgId.Sha1:
using (var h = new HMACSHA1(key))
{
return(h.ComputeHash(dataToHash));
}
case TpmAlgId.Sha256:
using (var h2 = new HMACSHA256(key))
{
return(h2.ComputeHash(dataToHash));
}
case TpmAlgId.Sha384:
using (var h3 = new HMACSHA384(key))
{
return(h3.ComputeHash(dataToHash));
}
case TpmAlgId.Sha512:
using (var h4 = new HMACSHA512(key))
{
return(h4.ComputeHash(dataToHash));
}
default:
Globs.Throw <ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return(null);
}
#endif // !TSS_USE_BCRYPT
}
public static byte[] HashData(TpmAlgId algId, byte[] dataToHash)
{
if (dataToHash == null)
{
dataToHash = new byte[0];
}
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(algId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw <ArgumentException>("HashData(): Unsupported hash algorithm " + algId);
return(null);
}
var alg = new BCryptAlgorithm(algName);
var digest = alg.HashData(dataToHash);
alg.Close();
return(digest);
#else
HashAlgorithm hashAlg = null;
switch (algId)
{
case TpmAlgId.Sha1:
hashAlg = new SHA1Managed();
break;
case TpmAlgId.Sha256:
hashAlg = new SHA256Managed();
break;
case TpmAlgId.Sha384:
hashAlg = new SHA384Managed();
break;
case TpmAlgId.Sha512:
hashAlg = new SHA512Managed();
break;
default:
Globs.Throw <ArgumentException>("AlgId is not a supported hash algorithm");
return(null);
}
return(hashAlg.ComputeHash(dataToHash));
#endif
}
public byte[] Export(string bcryptBlobType)
{
#if !TSS_USE_BCRYPT
if (RsaProvider == null)
{
return(null);
}
RSAParameters parms = RsaProvider.ExportParameters(bcryptBlobType == Native.BCRYPT_RSAPRIVATE_BLOB);
var alg = new BCryptAlgorithm(Native.BCRYPT_RSA_ALGORITHM);
var Key = alg.LoadRSAKey(parms.Exponent, parms.Modulus, parms.P, parms.Q);
#endif
byte[] keyBlob = Key.Export(bcryptBlobType);
#if !TSS_USE_BCRYPT
Key.Destroy();
alg.Close();
#endif
return(keyBlob);
}
public byte[] DecryptOaep(byte[] cipherText, byte[] label)
{
#if TSS_USE_BCRYPT
var paddingInfo = new BCryptOaepPaddingInfo(OaepHash, label);
byte[] plainText = Key.Decrypt(cipherText, paddingInfo);
#elif true
var rr = new RawRsa(RsaProvider.ExportParameters(true), RsaProvider.KeySize);
byte[] plainText = rr.OaepDecrypt(cipherText, OaepHash, label);
#else
RSAParameters parms = RsaProvider.ExportParameters(true);
var alg = new BCryptAlgorithm(Native.BCRYPT_RSA_ALGORITHM);
var key = alg.LoadRSAKey(parms.Exponent, parms.Modulus, parms.P, parms.Q);
var paddingInfo = new BCryptOaepPaddingInfo(OaepHash, label);
byte[] plainText = key.Decrypt(cipherText, paddingInfo);
key.Destroy();
alg.Close();
#endif
return(plainText);
}
public static byte[] Decrypt(byte[] bytes, Dictionary <ulong, Smb2CryptoInfo> cryptoInfoTable, Smb2Role role, out Transform_Header transformHeader)
{
var encryptedPacket = new Smb2EncryptedPacket();
int consumedLen;
int expectedLen;
encryptedPacket.FromBytes(bytes, out consumedLen, out expectedLen);
transformHeader = encryptedPacket.Header;
// For client: If the Flags/EncryptionAlgorithm in the SMB2 TRANSFORM_HEADER is not 0x0001, the client MUST discard the message.
// For server: If the Flags/EncryptionAlgorithm in the SMB2 TRANSFORM_HEADER is not 0x0001, the server MUST disconnect the connection.
if (transformHeader.Flags != TransformHeaderFlags.Encrypted)
{
throw new InvalidOperationException(
String.Format(
"Flags/EncryptionAlgorithm field is invalid for encrypted message. Expected value 0x0001, actual {0}.",
(ushort)transformHeader.Flags
)
);
}
if (transformHeader.SessionId == 0 || !cryptoInfoTable.ContainsKey(transformHeader.SessionId))
{
throw new InvalidOperationException("Invalid SessionId in TRANSFORM_HEADER.");
}
Smb2CryptoInfo cryptoInfo = cryptoInfoTable[transformHeader.SessionId];
using (var bcrypt = new BCryptAlgorithm("AES"))
{
int nonceLength = 0;
BCryptCipherMode mode = BCryptCipherMode.NotAvailable;
GetCryptoParams(cryptoInfo, CryptoOperationType.Decrypt, out mode, out nonceLength);
bcrypt.Mode = mode;
bcrypt.Key = role == Smb2Role.Server ? cryptoInfo.ServerInKey : cryptoInfo.ServerOutKey;
// Auth data is Transform_Header start from Nonce, excluding ProtocolId and Signature.
var authData = Smb2Utility.MarshalStructure(transformHeader).Skip((int)Marshal.OffsetOf <Transform_Header>("Nonce")).ToArray();
return(bcrypt.Decrypt(encryptedPacket.EncryptdData, transformHeader.Nonce.ToByteArray().Take(nonceLength).ToArray(), authData, transformHeader.Signature));
}
}
public static byte[] Decrypt(byte[] bytes, Dictionary <ulong, Smb2CryptoInfo> cryptoInfoTable, Smb2Role role)
{
Transform_Header transformHeader = Smb2Utility.UnmarshalStructure <Transform_Header>(bytes);
if (transformHeader.SessionId == 0 || !cryptoInfoTable.ContainsKey(transformHeader.SessionId))
{
throw new InvalidOperationException("Invalid SessionId in TRANSFORM_HEADER.");
}
Smb2CryptoInfo cryptoInfo = cryptoInfoTable[transformHeader.SessionId];
using (var bcrypt = new BCryptAlgorithm("AES"))
{
int nonceLength = 0;
BCryptCipherMode mode = BCryptCipherMode.NotAvailable;
GetCryptoParams(cryptoInfo, CryptoOperationType.Decrypt, out mode, out nonceLength);
bcrypt.Mode = mode;
bcrypt.Key = role == Smb2Role.Server ? cryptoInfo.ServerInKey : cryptoInfo.ServerOutKey;
return(bcrypt.Decrypt(bytes.Skip(52).ToArray(), transformHeader.Nonce.ToByteArray().Take(nonceLength).ToArray(), bytes.Skip(20).Take(32).ToArray(), transformHeader.Signature));
}
}
public static byte[] HashData(TpmAlgId algId, byte[] dataToHash)
{
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(algId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw<ArgumentException>("HashData(): Unsupported hash algorithm " + algId);
return null;
}
var alg = new BCryptAlgorithm(algName);
var digest = alg.HashData(dataToHash);
alg.Close();
return digest;
#else
HashAlgorithm hashAlg = null;
switch (algId)
{
case TpmAlgId.Sha1:
hashAlg = new SHA1Managed();
break;
case TpmAlgId.Sha256:
hashAlg = new SHA256Managed();
break;
case TpmAlgId.Sha384:
hashAlg = new SHA384Managed();
break;
case TpmAlgId.Sha512:
hashAlg = new SHA512Managed();
break;
default:
Globs.Throw<ArgumentException>("AlgId is not a supported hash algorithm");
return null;
}
return hashAlg.ComputeHash(dataToHash);
#endif
}
public static byte[] Mac(TpmAlgId symAlg, TpmAlgId macScheme, byte[] key, byte[] data)
{
if (symAlg != TpmAlgId.Aes)
{
Globs.Throw <ArgumentException>("CryptoLib.Mac(): Unsupported symmetric algorithm" + symAlg);
return(null);
}
if (macScheme != TpmAlgId.Cmac)
{
Globs.Throw <ArgumentException>("CryptoLib.Mac(): Unsupported MAC scheme " + macScheme);
return(null);
}
#if TSS_USE_BCRYPT
var alg = new BCryptAlgorithm(Native.BCRYPT_AES_CMAC_ALGORITHM);
var digest = alg.HmacData(key, data);
alg.Close();
return(digest);
#else
Globs.Throw <ArgumentException>("Mac(): .Net Crypto API does not support symmetric cipher based MAC." +
"Complile TSS.Net with BCrypt enabled.");
return(null);
#endif // !TSS_USE_BCRYPT
}
/// <summary>
/// Create a new SymmCipher object with a random key based on the alg and mode supplied.
/// </summary>
/// <param name="algId"></param>
/// <param name="numBits"></param>
/// <param name="mode"></param>
/// <returns></returns>
public static SymmCipher Create(SymDefObject symDef = null, byte[] keyData = null, byte[] iv = null)
{
if (symDef == null)
{
symDef = new SymDefObject(TpmAlgId.Aes, 128, TpmAlgId.Cfb);
}
#if TSS_USE_BCRYPT
BCryptAlgorithm alg = null;
switch (symDef.Algorithm)
{
case TpmAlgId.Aes:
alg = new BCryptAlgorithm(Native.BCRYPT_AES_ALGORITHM);
break;
case TpmAlgId.Tdes:
alg = new BCryptAlgorithm(Native.BCRYPT_3DES_ALGORITHM);
break;
default:
Globs.Throw<ArgumentException>("Unsupported symmetric algorithm " + symDef.Algorithm);
break;
}
if (keyData == null)
{
keyData = Globs.GetRandomBytes(symDef.KeyBits / 8);
}
var key = alg.GenerateSymKey(symDef, keyData, GetBlockSize(symDef));
//key = BCryptInterface.ExportSymKey(keyHandle);
//keyHandle = alg.LoadSymKey(key, symDef, GetBlockSize(symDef));
alg.Close();
return key == null ? null : new SymmCipher(key, keyData, iv);
#else
SymmetricAlgorithm alg = null; // = new RijndaelManaged();
bool limitedSupport = false;
// DES and __3DES are not supported in TPM 2.0 rev. 0.96 to 1.30
switch (symDef.Algorithm) {
case TpmAlgId.Aes:
alg = new RijndaelManaged();
break;
case TpmAlgId.Tdes:
alg = new TripleDESCryptoServiceProvider();
limitedSupport = true;
break;
default:
Globs.Throw<ArgumentException>("Unsupported symmetric algorithm " + symDef.Algorithm);
break;
}
int blockSize = GetBlockSize(symDef);
alg.KeySize = symDef.KeyBits;
alg.BlockSize = blockSize * 8;
alg.Padding = PaddingMode.None;
alg.Mode = GetCipherMode(symDef.Mode);
// REVISIT: Get this right for other modes
if (symDef.Algorithm == TpmAlgId.Tdes && symDef.Mode == TpmAlgId.Cfb)
{
alg.FeedbackSize = 8;
}
else
{
alg.FeedbackSize = alg.BlockSize;
}
if (keyData == null)
{
// Generate random key
alg.IV = Globs.GetZeroBytes(blockSize);
try
{
alg.GenerateKey();
}
catch (Exception)
{
alg.Dispose();
throw;
}
}
else
{
// Use supplied key bits
alg.Key = keyData;
if (iv == null)
{
iv = Globs.GetZeroBytes(blockSize);
}
else if (iv.Length != blockSize)
{
Array.Resize(ref iv, blockSize);
}
alg.IV = iv;
}
var symCipher = new SymmCipher(alg);
symCipher.LimitedSupport = limitedSupport;
return symCipher;
#endif
}
/// <summary>
/// Create a new SymCipher object with a random key based on the alg and mode supplied.
/// </summary>
/// <param name="symDef"></param>
/// <param name="keyData"></param>
/// <param name="iv"></param>
/// <returns></returns>
public static SymCipher Create(SymDefObject symDef = null,
byte[] keyData = null, byte[] iv = null)
{
if (symDef == null)
{
symDef = new SymDefObject(TpmAlgId.Aes, 128, TpmAlgId.Cfb);
}
#if TSS_USE_BCRYPT
BCryptAlgorithm alg = null;
switch (symDef.Algorithm)
{
case TpmAlgId.Aes:
alg = new BCryptAlgorithm(Native.BCRYPT_AES_ALGORITHM);
break;
case TpmAlgId.Tdes:
alg = new BCryptAlgorithm(Native.BCRYPT_3DES_ALGORITHM);
break;
default:
Globs.Throw <ArgumentException>("Unsupported symmetric algorithm "
+ symDef.Algorithm);
return(null);
}
if (keyData == null)
{
keyData = Globs.GetRandomBytes(symDef.KeyBits / 8);
}
var key = alg.GenerateSymKey(symDef, keyData, GetBlockSize(symDef));
//key = BCryptInterface.ExportSymKey(keyHandle);
//keyHandle = alg.LoadSymKey(key, symDef, GetBlockSize(symDef));
alg.Close();
return(key == null ? null : new SymCipher(key, keyData, iv, GetBlockSize(symDef)));
#else // !TSS_USE_BCRYPT
if (symDef.Mode == TpmAlgId.Ofb)
{
return(null);
}
var mode = GetCipherMode(symDef.Mode);
if (mode == CipherMode_None)
{
return(null);
}
SymmetricAlgorithm alg = null; // = new RijndaelManaged();
bool limitedSupport = false;
int feedbackSize = 0;
switch (symDef.Algorithm)
{
case TpmAlgId.Aes:
alg = new RijndaelManaged();
alg.Mode = mode == CipherMode.CFB ? CipherMode.ECB : mode;
break;
case TpmAlgId.Tdes:
// DES and __3DES are not supported in TPM 2.0 rev. < 1.32
alg = new TripleDESCryptoServiceProvider();
alg.Mode = mode;
if (mode == CipherMode.CFB)
{
feedbackSize = 8;
}
limitedSupport = true;
break;
default:
//Globs.Throw<ArgumentException>("Unsupported symmetric algorithm " + symDef.Algorithm);
return(null);
}
int blockSize = GetBlockSize(symDef);
alg.KeySize = symDef.KeyBits;
alg.BlockSize = blockSize * 8;
alg.Padding = PaddingMode.None;
alg.FeedbackSize = feedbackSize == 0 ? alg.BlockSize : feedbackSize;
if (keyData == null)
{
// Generate random key
alg.IV = Globs.GetZeroBytes(blockSize);
try
{
alg.GenerateKey();
}
catch (Exception)
{
alg.Dispose();
throw;
}
}
else
{
// Use supplied key bits
alg.Key = keyData;
if (iv == null)
{
iv = Globs.GetZeroBytes(blockSize);
}
else if (iv.Length != blockSize)
{
Array.Resize(ref iv, blockSize);
}
alg.IV = iv;
}
var symCipher = new SymCipher(alg, mode);
symCipher.LimitedSupport = limitedSupport;
return(symCipher);
#endif // !TSS_USE_BCRYPT
} // Create()
private static byte[] Encrypt(ulong sessionId, Smb2CryptoInfo cryptoInfo, Smb2Role role, Smb2Packet originalPacket)
{
Packet_Header header;
if (originalPacket is Smb2SinglePacket)
{
header = (originalPacket as Smb2SinglePacket).Header;
}
else
{
header = (originalPacket as Smb2CompoundPacket).Packets[0].Header;
}
// Encrypt all messages after session setup if global encryption enabled.
// Encrypt all messages after tree connect if global encryption disabled but share encryption enabled.
if ((cryptoInfo.EnableSessionEncryption ||
(cryptoInfo.EnableTreeEncryption.Contains(header.TreeId) &&
header.Command != Smb2Command.TREE_CONNECT
)
)
)
{
using (var bcrypt = new BCryptAlgorithm("AES"))
{
byte[] originalBinary = originalPacket.ToBytes();
Transform_Header transformHeader = new Transform_Header
{
ProtocolId = Smb2Consts.ProtocolIdInTransformHeader,
OriginalMessageSize = (uint)originalBinary.Length,
SessionId = sessionId,
Signature = new byte[16]
};
if (cryptoInfo.Dialect == DialectRevision.Smb311)
{
transformHeader.Flags = TransformHeaderFlags.Encrypted;
}
else
{
transformHeader.EncryptionAlgorithm = EncryptionAlgorithm.ENCRYPTION_AES128_CCM;
}
byte[] tag;
int nonceLength = 0;
BCryptCipherMode mode = BCryptCipherMode.NotAvailable;
GetCryptoParams(cryptoInfo, CryptoOperationType.Encrypt, out mode, out nonceLength);
bcrypt.Mode = mode;
bcrypt.Key = role == Smb2Role.Server ? cryptoInfo.ServerOutKey : cryptoInfo.ServerInKey;
// The reserved field (5 bytes for CCM, 4 bytes for GCM) must be set to zero.
byte[] nonce = new byte[16];
Buffer.BlockCopy(Guid.NewGuid().ToByteArray(), 0, nonce, 0, nonceLength);
transformHeader.Nonce = new Guid(nonce);
byte[] output = bcrypt.Encrypt(
originalBinary,
transformHeader.Nonce.ToByteArray().Take(nonceLength).ToArray(),
// Use the fields including and after Nonce field as auth data
Smb2Utility.MarshalStructure(transformHeader).Skip(20).ToArray(),
// Signature is 16 bytes in length
16,
out tag);
transformHeader.Signature = tag;
return(Smb2Utility.MarshalStructure(transformHeader).Concat(output).ToArray());
}
}
// Return null if the message is not required to be encrypted.
return(null);
}
private static string HashPassword(string password, string salt)
{
return(BCryptAlgorithm.HashPassword(password, salt));
}
public static string HashPassword(string password, uint rounds)
{
return(BCryptAlgorithm.HashPassword(password, BCryptAlgorithm.GenerateSalt(rounds)));
}
/// <summary>
/// Create a new AsymCryptoSystem from TPM public parameter. This can then
/// be used to validate TPM signatures or encrypt data destined for a TPM.
/// </summary>
/// <param name="pubKey"></param>
/// <param name="privKey"></param>
/// <returns></returns>
public static AsymCryptoSystem CreateFrom(TpmPublic pubKey, TpmPrivate privKey = null)
{
var cs = new AsymCryptoSystem();
TpmAlgId keyAlgId = pubKey.type;
cs.PublicParms = pubKey.Copy();
// Create an algorithm provider from the provided PubKey
switch (keyAlgId)
{
case TpmAlgId.Rsa:
{
RawRsa rr = null;
byte[] prime1 = null,
prime2 = null;
if (privKey != null)
{
rr = new RawRsa(pubKey, privKey);
prime1 = RawRsa.ToBigEndian(rr.P);
prime2 = RawRsa.ToBigEndian(rr.Q);
}
var rsaParams = (RsaParms)pubKey.parameters;
var exponent = rsaParams.exponent != 0
? Globs.HostToNet(rsaParams.exponent)
: RsaParms.DefaultExponent;
var modulus = (pubKey.unique as Tpm2bPublicKeyRsa).buffer;
#if TSS_USE_BCRYPT
var alg = new BCryptAlgorithm(Native.BCRYPT_RSA_ALGORITHM);
cs.Key = alg.LoadRSAKey(exponent, modulus, prime1, prime2);
alg.Close();
#else
var dotNetPubParms = new RSAParameters()
{
Exponent = exponent, Modulus = modulus
};
if (privKey != null)
{
dotNetPubParms.P = prime1;
dotNetPubParms.Q = prime2;
dotNetPubParms.D = RawRsa.ToBigEndian(rr.D);
dotNetPubParms.InverseQ = RawRsa.ToBigEndian(rr.InverseQ);
dotNetPubParms.DP = RawRsa.ToBigEndian(rr.DP);
dotNetPubParms.DQ = RawRsa.ToBigEndian(rr.DQ);
}
cs.RsaProvider = new RSACryptoServiceProvider();
cs.RsaProvider.ImportParameters(dotNetPubParms);
#endif
break;
}
#if !__MonoCS__
case TpmAlgId.Ecc:
{
var eccParms = (EccParms)pubKey.parameters;
var eccPub = (EccPoint)pubKey.unique;
var algId = RawEccKey.GetEccAlg(pubKey);
if (algId == null)
{
return(null);
}
bool isEcdsa = eccParms.scheme.GetUnionSelector() == TpmAlgId.Ecdsa;
byte[] keyBlob = RawEccKey.GetKeyBlob(eccPub.x, eccPub.y, keyAlgId,
!isEcdsa, eccParms.curveID);
#if TSS_USE_BCRYPT
var alg = new BCryptAlgorithm(algId);
cs.Key = alg.ImportKeyPair(Native.BCRYPT_ECCPUBLIC_BLOB, keyBlob);
alg.Close();
if (cs.Key == UIntPtr.Zero)
{
Globs.Throw("Failed to create new RSA key");
return(null);
}
#else
CngKey eccKey = CngKey.Import(keyBlob, CngKeyBlobFormat.EccPublicBlob);
if (pubKey.objectAttributes.HasFlag(ObjectAttr.Sign))
{
cs.EcdsaProvider = new ECDsaCng(eccKey);
}
else
{
cs.EcDhProvider = new ECDiffieHellmanCng(eccKey);
}
#endif // !TSS_USE_BCRYPT
break;
}
#endif // !__MonoCS__
default:
Globs.Throw <ArgumentException>("Algorithm not supported");
cs = null;
break;
}
return(cs);
}
public static bool VerifyPassword(string password, string hashed)
{
return(BCryptAlgorithm.VerifyPassword(password, hashed));
}
public static byte[] HmacData(TpmAlgId hashAlgId, byte[] key, byte[] dataToHash)
{
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(hashAlgId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw<ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return null;
}
var alg = new BCryptAlgorithm(algName, Native.BCRYPT_ALG_HANDLE_HMAC);
var digest = alg.HmacData(key, dataToHash);
alg.Close();
return digest;
#else
switch (hashAlgId)
{
case TpmAlgId.Sha1:
using (var h = new HMACSHA1(key))
{
return h.ComputeHash(dataToHash);
}
case TpmAlgId.Sha256:
using (var h2 = new HMACSHA256(key))
{
return h2.ComputeHash(dataToHash);
}
case TpmAlgId.Sha384:
using (var h3 = new HMACSHA384(key))
{
return h3.ComputeHash(dataToHash);
}
case TpmAlgId.Sha512:
using (var h4 = new HMACSHA512(key))
{
return h4.ComputeHash(dataToHash);
}
default:
Globs.Throw<ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return null;
}
#endif // !TSS_USE_BCRYPT
}
/// <summary>
/// Hash a password using the OpenBSD bcrypt scheme.
/// </summary>
/// <param name="password">The password to hash.</param>
/// <param name="salt">The salt to hash with (perhaps generated
/// using <c>BCrypt.GenerateSalt</c>).</param>
/// <returns>The hashed password.</returns>
public static string HashPassword(string password, string salt)
{
if (password == null)
{
throw new ArgumentNullException("password");
}
if (salt == null)
{
throw new ArgumentNullException("salt");
}
char minor = (char)0;
if (salt[0] != '$' || salt[1] != '2')
{
throw new ArgumentException("Invalid salt version");
}
int offset;
if (salt[1] != '$')
{
minor = salt[2];
if (minor != 'a' || salt[3] != '$')
{
throw new ArgumentException("Invalid salt revision");
}
offset = 4;
}
else
{
offset = 3;
}
// Extract number of rounds
if (salt[offset + 2] > '$')
{
throw new ArgumentException("Missing salt rounds");
}
int rounds = Int32.Parse(salt.Substring(offset, 2), NumberFormatInfo.InvariantInfo);
byte[] passwordBytes = Encoding.UTF8.GetBytes(password + (minor >= 'a' ? "\0" : String.Empty));
byte[] saltBytes = DecodeBase64(salt.Substring(offset + 3, 22),
BCRYPT_SALT_LEN);
BCryptAlgorithm bcrypt = new BCryptAlgorithm();
byte[] hashed = bcrypt.CryptRaw(passwordBytes, saltBytes, rounds);
StringBuilder rs = new StringBuilder();
rs.Append("$2");
if (minor >= 'a')
{
rs.Append(minor);
}
rs.Append('$');
if (rounds < 10)
{
rs.Append('0');
}
rs.Append(rounds);
rs.Append('$');
rs.Append(EncodeBase64(saltBytes, saltBytes.Length));
rs.Append(EncodeBase64(hashed,
(bf_crypt_ciphertext.Length * 4) - 1));
return(rs.ToString());
}
public static string HashPassword(string password)
{
return(HashPassword(password, BCryptAlgorithm.GenerateSalt()));
}
/// <summary>
/// Create a new SymmCipher object with a random key based on the alg and mode supplied.
/// </summary>
/// <param name="algId"></param>
/// <param name="numBits"></param>
/// <param name="mode"></param>
/// <returns></returns>
public static SymmCipher Create(SymDefObject symDef = null, byte[] keyData = null, byte[] iv = null)
{
if (symDef == null)
{
symDef = new SymDefObject(TpmAlgId.Aes, 128, TpmAlgId.Cfb);
}
else if (symDef.Algorithm != TpmAlgId.Aes)
{
Globs.Throw <ArgumentException>("Unsupported symmetric algorithm " + symDef.Algorithm);
return(null);
}
#if TSS_USE_BCRYPT
var alg = new BCryptAlgorithm(Native.BCRYPT_AES_ALGORITHM);
if (keyData == null)
{
keyData = Globs.GetRandomBytes(symDef.KeyBits / 8);
}
var key = alg.GenerateSymKey(symDef, keyData, GetBlockSize(symDef));
//key = BCryptInterface.ExportSymKey(keyHandle);
//keyHandle = alg.LoadSymKey(key, symDef, GetBlockSize(symDef));
alg.Close();
return(new SymmCipher(key, keyData, iv));
#else
SymmetricAlgorithm alg = new RijndaelManaged();
// DES and __3DES are not supported in TPM 2.0 v 0.96 and above
//switch (algId) {
// case TpmAlgId.Aes: alg = new RijndaelManaged(); break;
// case TpmAlgId.__3DES: alg = new TripleDESCryptoServiceProvider(); break;
// case TpmAlgId.Des: alg = new DESCryptoServiceProvider(); break;
//}
int blockSize = GetBlockSize(symDef);
alg.KeySize = symDef.KeyBits;
alg.BlockSize = blockSize * 8;
alg.Padding = PaddingMode.None;
alg.Mode = GetCipherMode(symDef.Mode);
// REVISIT: Get this right for other modes
alg.FeedbackSize = alg.BlockSize;
if (keyData == null)
{
// Generate random key
alg.IV = Globs.GetZeroBytes(blockSize);
try
{
alg.GenerateKey();
}
catch (Exception)
{
alg.Dispose();
throw;
}
}
else
{
// Use supplied key bits
alg.Key = keyData;
if (iv == null)
{
iv = Globs.GetZeroBytes(blockSize);
}
else if (iv.Length != blockSize)
{
Array.Resize(ref iv, blockSize);
}
alg.IV = iv;
}
return(new SymmCipher(alg));
#endif
}