private byte[] Func()
{
byte[] array = Utils_Int(m_block);
m_hmac.TransformBlock(m_salt, 0, m_salt.Length, null, 0);
m_hmac.TransformBlock(array, 0, array.Length, null, 0);
var _EmptyArray_byte_Value = new byte[0]; // EmptyArray<byte>.Value
m_hmac.TransformFinalBlock(_EmptyArray_byte_Value, 0, 0);
byte[] hashValue = m_hmac.Hash;
m_hmac.Initialize();
byte[] array2 = hashValue;
for (int i = 2; i <= m_iterations; i++)
{
m_hmac.TransformBlock(hashValue, 0, hashValue.Length, null, 0);
m_hmac.TransformFinalBlock(_EmptyArray_byte_Value, 0, 0);
hashValue = m_hmac.Hash;
for (int j = 0; j < m_blockSize; j++)
{
array2[j] ^= hashValue[j];
}
m_hmac.Initialize();
}
m_block++;
return(array2);
}
public override void Reset()
{
_md5HMAC.Initialize();
_md5Ai = _md5HMAC.ComputeHash(_seed);
_md5Hash = new byte[0];
_sha1HMAC.Initialize();
_sha1Ai = _sha1HMAC.ComputeHash(_seed);
_sha1Hash = new byte[0];
}
// This function is defined as follow :
// Func (S, i) = HMAC(S || i) | HMAC2(S || i) | ... | HMAC(iterations) (S || i)
// where i is the block number.
byte[] Func()
{
var intBlock = UintToBigEndianBytes(_block);
_hmac.TransformBlock(_salt, 0, _salt.Length, _salt, 0);
_hmac.TransformFinalBlock(intBlock, 0, intBlock.Length);
var temp = _hmac.Hash;
_hmac.Initialize();
var ret = temp;
for (var i = 2; i <= _iterations; i++)
{
temp = _hmac.ComputeHash(temp);
for (var j = 0; j < BlockSize; j++)
{
ret[j] ^= temp[j];
}
}
// increment the block count.
_block++;
return(ret);
}
public void ValidateBytes(ContentType contentType, ulong seqNum, int frameIndex,
byte[] plainBytes, byte[] mac, byte[] padding)
{
if (SecurityParameters.MACAlgorithm != MACAlgorithm.Null)
{
byte[] versionAndType = new byte[] { (byte)contentType, m_protocolVersion[0], m_protocolVersion[1] };
byte[] seqNumBytes = BitConverter.GetBytes(seqNum);
byte[] messageSize = BitConverter.GetBytes(plainBytes.Length);
byte[] frameIndexBytes = BitConverter.GetBytes(frameIndex);
m_decryptionHMAC.Initialize();
m_decryptionHMAC.TransformBlock(seqNumBytes, 0, seqNumBytes.Length, seqNumBytes, 0);
m_decryptionHMAC.TransformBlock(versionAndType, 0, versionAndType.Length, versionAndType, 0);
m_decryptionHMAC.TransformBlock(messageSize, 0, messageSize.Length, messageSize, 0);
m_decryptionHMAC.TransformBlock(frameIndexBytes, 0, frameIndexBytes.Length, frameIndexBytes, 0);
m_decryptionHMAC.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
if (!m_decryptionHMAC.Hash.SequenceEqual(mac))
{
throw new NetMQSecurityException(NetMQSecurityErrorCode.MACNotMatched, "MAC not matched message");
}
for (int i = 0; i < padding.Length; i++)
{
if (padding[i] != padding.Length - 1)
{
throw new NetMQSecurityException(NetMQSecurityErrorCode.MACNotMatched, "MAC not matched message");
}
}
}
}
/// <summary>
/// Check the given arguments and throw a <see cref="NetMQSecurityException"/> if something is amiss.
/// </summary>
/// <param name="contentType">This identifies the type of content: ChangeCipherSpec, Handshake, or ApplicationData.</param>
/// <param name="seqNum"></param>
/// <param name="frameIndex"></param>
/// <param name="plainBytes"></param>
/// <param name="mac"></param>
/// <param name="padding"></param>
/// <exception cref="NetMQSecurityException"><see cref="NetMQSecurityErrorCode.MACNotMatched"/>: MAC does not match message.</exception>
public void ValidateBytes(ContentType contentType, ulong seqNum, byte[] plainBytes, byte[] mac, byte[] padding)
{
if (SecurityParameters.MACAlgorithm != MACAlgorithm.Null)
{
byte[] typeAndVersion = new[] { (byte)contentType, m_SubProtocolVersion[0], m_SubProtocolVersion[1] };
byte[] seqNumBytes = BitConverter.GetBytes(seqNum).Reverse().ToArray();
byte[] messageSize = BitConverter.GetBytes(plainBytes.Length).Take(2).Reverse().ToArray();
//byte[] messageSize = plainBytes.LengthToBytes(2);
m_decryptionHMAC.Initialize();
m_decryptionHMAC.TransformBlock(seqNumBytes, 0, seqNumBytes.Length, seqNumBytes, 0);
m_decryptionHMAC.TransformBlock(typeAndVersion, 0, typeAndVersion.Length, typeAndVersion, 0);
m_decryptionHMAC.TransformBlock(messageSize, 0, messageSize.Length, messageSize, 0);
m_decryptionHMAC.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
//MAC(MAC_write_key, seq_num +
// TLSCompressed.type +
// TLSCompressed.version +
// TLSCompressed.length +
// TLSCompressed.fragment);
//where "+" denotes concatenation.
if (!m_decryptionHMAC.Hash.SequenceEqual(mac))
{
throw new NetMQSecurityException(NetMQSecurityErrorCode.MACNotMatched, "MAC does not match message");
}
for (int i = 0; i < padding.Length; i++)
{
if (padding[i] != padding.Length - 1)
{
throw new NetMQSecurityException(NetMQSecurityErrorCode.MACNotMatched, "MAC not matched message");
}
}
}
}
private static byte[] F(string password, Salt salt, int derivationIterations)
{
HMAC hmacsha512 = New <HMACSHA512>().Initialize(new SymmetricKey(new UTF8Encoding(false).GetBytes(password)));
hmacsha512.TransformBlock(salt.GetBytes(), 0, salt.Length, null, 0);
byte[] iBytes = 1.GetBigEndianBytes();
hmacsha512.TransformBlock(iBytes, 0, iBytes.Length, null, 0);
hmacsha512.TransformFinalBlock(_empty, 0, 0);
byte[] u = hmacsha512.Hash();
byte[] un = u;
for (int c = 2; c <= derivationIterations; ++c)
{
hmacsha512.Initialize();
hmacsha512.TransformBlock(u, 0, u.Length, null, 0);
hmacsha512.TransformFinalBlock(_empty, 0, 0);
u = hmacsha512.Hash();
for (int i = 0; i < u.Length; i++)
{
un[i] ^= u[i];
}
}
return(un);
}
protected void VerifyHmac(
int testCaseId,
string digest,
int truncateSize = -1)
{
byte[] digestBytes = ByteUtils.HexToByteArray(digest);
byte[] data = _testData[testCaseId];
byte[] computedDigest;
using (HMAC hmac = Create())
{
Assert.True(hmac.HashSize > 0);
byte[] key = (byte[])_testKeys[testCaseId].Clone();
hmac.Key = key;
// make sure the getter returns different objects each time
Assert.NotSame(key, hmac.Key);
Assert.NotSame(hmac.Key, hmac.Key);
// make sure the setter didn't cache the exact object we passed in
key[0] = (byte)(key[0] + 1);
Assert.NotEqual <byte>(key, hmac.Key);
computedDigest = hmac.ComputeHash(data);
}
if (truncateSize != -1)
{
byte[] tmp = new byte[truncateSize];
Array.Copy(computedDigest, tmp, truncateSize);
computedDigest = tmp;
}
Assert.Equal(digestBytes, computedDigest);
using (HMAC hmac = Create())
{
byte[] key = (byte[])_testKeys[testCaseId].Clone();
hmac.Key = key;
hmac.TransformBlock(data, 0, data.Length, null, 0);
hmac.Initialize();
hmac.TransformBlock(data, 0, data.Length, null, 0);
hmac.TransformFinalBlock(Array.Empty <byte>(), 0, 0);
computedDigest = hmac.Hash;
}
if (truncateSize != -1)
{
byte[] tmp = new byte[truncateSize];
Array.Copy(computedDigest, tmp, truncateSize);
computedDigest = tmp;
}
Assert.Equal(digestBytes, computedDigest);
}
public void CheckE(string testName, HMAC algo, byte[] data, byte[] result)
{
byte[] copy = new byte[data.Length];
for (int i = 0; i < data.Length - 1; i++)
{
algo.TransformBlock(data, i, 1, copy, i);
}
algo.TransformFinalBlock(data, data.Length - 1, 1);
Compare(result, algo.Hash, testName + "e");
algo.Initialize();
}
private byte[] EncryptBytes(ICryptoTransform encryptor, ContentType contentType, ulong seqNum,
int frameIndex, byte[] plainBytes)
{
byte[] mac;
if (SecurityParameters.MACAlgorithm != MACAlgorithm.Null)
{
byte[] versionAndType = new byte[] { (byte)contentType, m_protocolVersion[0], m_protocolVersion[1] };
byte[] seqNumBytes = BitConverter.GetBytes(seqNum);
byte[] messageSize = BitConverter.GetBytes(plainBytes.Length);
byte[] frameIndexBytes = BitConverter.GetBytes(frameIndex);
m_encryptionHMAC.Initialize();
m_encryptionHMAC.TransformBlock(seqNumBytes, 0, seqNumBytes.Length, seqNumBytes, 0);
m_encryptionHMAC.TransformBlock(versionAndType, 0, versionAndType.Length, versionAndType, 0);
m_encryptionHMAC.TransformBlock(messageSize, 0, messageSize.Length, messageSize, 0);
m_encryptionHMAC.TransformBlock(frameIndexBytes, 0, frameIndexBytes.Length, frameIndexBytes, 0);
m_encryptionHMAC.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
mac = m_encryptionHMAC.Hash;
}
else
{
mac = new byte[0];
}
int length = plainBytes.Length + SecurityParameters.MACLength;
byte padding = 0;
if (SecurityParameters.BulkCipherAlgorithm != BulkCipherAlgorithm.Null)
{
padding = (byte)((encryptor.OutputBlockSize -
(plainBytes.Length + SecurityParameters.MACLength + 1) % encryptor.OutputBlockSize) %
encryptor.OutputBlockSize);
length += padding + 1;
}
byte[] cipherBytes = new byte[length];
Buffer.BlockCopy(plainBytes, 0, cipherBytes, 0, plainBytes.Length);
Buffer.BlockCopy(mac, 0, cipherBytes, plainBytes.Length, SecurityParameters.MACLength);
if (SecurityParameters.BulkCipherAlgorithm != BulkCipherAlgorithm.Null)
{
for (int i = plainBytes.Length + SecurityParameters.MACLength; i < cipherBytes.Length; i++)
{
cipherBytes[i] = padding;
}
encryptor.TransformBlock(cipherBytes, 0, cipherBytes.Length, cipherBytes, 0);
}
return(cipherBytes);
}
public static byte[] ComputeHash(this HMAC hmac, params byte[][] blobs)
{
hmac.Initialize();
// TODO: generalize to allow encodings other than UTF-8.
foreach (var blob in blobs.Take(blobs.Length - 1))
{
hmac.TransformBlock(blob, 0, blob.Length, null, 0);
}
var lastBlob = blobs[blobs.Length - 1];
hmac.TransformFinalBlock(lastBlob, 0, lastBlob.Length);
return(hmac.Hash);
}
static byte[] Compute_PHash(int bytes, byte[][] seeds, HMAC hmac, int blockSize)
{
int blocks = (bytes / blockSize) + (bytes % blockSize == 0 ? 0 : 1);
byte[] ret = new byte[blockSize * blocks];
byte[] prev = null;
for (int i = 0; i < blocks; i++)
{
hmac.Initialize();
if (prev == null)
{
for (int q = 0; q < seeds.Length; q++)
{
hmac.TransformBlock(seeds[q], 0, seeds[q].Length, seeds[q], 0);
}
}
else
{
hmac.TransformBlock(prev, 0, prev.Length, prev, 0);
}
hmac.TransformFinalBlock(Utility.EmptyByteArray, 0, 0);
prev = hmac.Hash;
hmac.Initialize();
hmac.TransformBlock(prev, 0, prev.Length, prev, 0);
for (int q = 0; q < seeds.Length; q++)
{
hmac.TransformBlock(seeds[q], 0, seeds[q].Length, seeds[q], 0);
}
hmac.TransformFinalBlock(Utility.EmptyByteArray, 0, 0);
for (int q = 0; q < blockSize; q++)
{
ret[i * blockSize + q] = hmac.Hash[q];
}
}
return(ret);
}
protected void VerifyHmac(int testCaseId, byte[] digestBytes)
{
byte[] data = _testData[testCaseId];
byte[] computedDigest;
int truncateSize = digestBytes.Length;
AssertExtensions.LessThanOrEqualTo(truncateSize, MacSize);
using (HMAC hmac = Create())
{
Assert.Equal(MacSize, hmac.HashSize / 8);
byte[] key = (byte[])_testKeys[testCaseId].Clone();
hmac.Key = key;
// make sure the getter returns different objects each time
Assert.NotSame(key, hmac.Key);
Assert.NotSame(hmac.Key, hmac.Key);
// make sure the setter didn't cache the exact object we passed in
key[0] = (byte)(key[0] + 1);
Assert.NotEqual <byte>(key, hmac.Key);
computedDigest = hmac.ComputeHash(data);
}
computedDigest = Truncate(computedDigest, truncateSize);
Assert.Equal(digestBytes, computedDigest);
using (HMAC hmac = Create())
{
byte[] key = (byte[])_testKeys[testCaseId].Clone();
hmac.Key = key;
hmac.TransformBlock(data, 0, data.Length, null, 0);
hmac.Initialize();
hmac.TransformBlock(data, 0, data.Length, null, 0);
hmac.TransformFinalBlock(Array.Empty <byte>(), 0, 0);
computedDigest = hmac.Hash;
}
computedDigest = Truncate(computedDigest, truncateSize);
Assert.Equal(digestBytes, computedDigest);
// One shot - allocating and byte array inputs
computedDigest = HashDataOneShot(_testKeys[testCaseId], data);
computedDigest = Truncate(computedDigest, truncateSize);
Assert.Equal(digestBytes, computedDigest);
static readonly byte[] emptyArray64 = new byte[64]; // for SHA-512
public HKDF(Func<HMAC> hmacFactory, byte[] ikm, byte[] salt = null, byte[] context = null)
{
hmac = hmacFactory();
hmac2 = hmac as HMAC2;
hashLength = hmac.HashSize >> 3;
// a malicious implementation of HMAC could conceivably mess up the shared static empty byte arrays, which are still writeable...
hmac.Key = salt ?? (hashLength == 48 ? emptyArray48 : hashLength == 64 ? emptyArray64 : hashLength == 32 ? emptyArray32 : hashLength == 20 ? emptyArray20 : new byte[hashLength]);
// re-keying hmac with PRK
hmac.TransformBlock(ikm, 0, ikm.Length, null, 0);
hmac.TransformFinalBlock(ikm, 0, 0);
hmac.Key = (hmac2 != null) ? hmac2.HashInner : hmac.Hash;
hmac.Initialize();
this.context = context;
Reset();
}
/// <summary>
/// Generates PIN code based on given Base32 secret code, interval length, and desired PIN code length
/// </summary>
/// <param name="secret">Base32 Secret Code</param>
/// <returns>PIN code with desired number of digits</returns>
public string computePin(string secret)
{
string strToReturn = "";
try
{
byte[] keyBytes = FromBase32String(secret);
mac = new HMACSHA1(keyBytes);
mac.Initialize();
strToReturn = generateResponseCode(getCurrentInterval());
}
catch (Exception e)
{
return(e.Message);
}
return(strToReturn);
}
/// <summary>
/// Creates the signature.
/// </summary>
/// <returns>The signature.</returns>
/// <param name="message">Message.</param>
public string CreateSignature(Message message)
{
_signatureGenerator.Initialize();
var messages = GetMessagesToAddForDigest(message);
// For all items update the signature
foreach (var item in messages)
{
var sourceBytes = _encoder.GetBytes(item);
_signatureGenerator.TransformBlock(sourceBytes, 0, sourceBytes.Length, null, 0);
}
_signatureGenerator.TransformFinalBlock(new byte[0], 0, 0);
// Calculate the digest and remove -
return(BitConverter.ToString(_signatureGenerator.Hash).Replace("-", "").ToLower());
}
/// <summary>
/// Creates the signature.
/// </summary>
/// <returns>The signature.</returns>
/// <param name="message">Message.</param>
public string CreateSignature(params string[] messages)
{
byte[] sourceBytes;
_signatureGenerator.Initialize();
// For all items update the signature
var last = messages.Length - 1;
for (var i = 0; i < last; i++)
{
sourceBytes = this._encoder.GetBytes(messages[i]);
_signatureGenerator.TransformBlock(sourceBytes, 0, sourceBytes.Length, null, 0);
}
sourceBytes = _encoder.GetBytes(messages[last]);
_signatureGenerator.TransformFinalBlock(sourceBytes, 0, sourceBytes.Length);
// Calculate the digest and remove -
return(BitConverter.ToString(_signatureGenerator.Hash).Replace("-", "").ToLower());
}
/**
* Computes RFC 2104-compliant HMAC signature.
*/
public static String sign(String data, String key, String signatureMethod)// throws SignatureException
{
try
{
ASCIIEncoding encoding = new ASCIIEncoding();
HMAC Hmac = HMAC.Create(signatureMethod);
Hmac.Key = encoding.GetBytes(key);
Hmac.Initialize();
CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write);
cs.Write(encoding.GetBytes(data), 0, encoding.GetBytes(data).Length);
cs.Close();
byte[] rawResult = Hmac.Hash;
String sig = Convert.ToBase64String(rawResult, 0, rawResult.Length);
return(sig);
}
catch (Exception e)
{
throw new AmazonFPSException("Failed to generate signature: " + e.Message);
}
}
private static String Sign(String data, String key, String signatureMethod)
{
try
{
var encoding = new ASCIIEncoding();
HMAC hmac = HMAC.Create(signatureMethod);
hmac.Key = encoding.GetBytes(key);
hmac.Initialize();
var cs = new CryptoStream(Stream.Null, hmac, CryptoStreamMode.Write);
var bytes = encoding.GetBytes(data);
cs.Write(bytes, 0, bytes.Length);
cs.Close();
byte[] rawResult = hmac.Hash;
String sig = Convert.ToBase64String(rawResult, 0, rawResult.Length);
return(sig);
}
catch (Exception e)
{
throw new Exception("Failed to generate signature: " + e.Message);
}
}
private void HmacDescriptionTest()
{
CSPPrng rng = new CSPPrng();
byte[] data = rng.GetBytes(rng.Next(100, 400));
byte[] key = rng.GetBytes(64);
HMAC mac = new HMAC(Digests.SHA256);
mac.Initialize(key);
byte[] c1 = mac.ComputeMac(data);
MacDescription mds = new MacDescription(64, Digests.SHA256);
MacStream mst = new MacStream(mds, new KeyParams(key));
mst.Initialize(new MemoryStream(data));
byte[] c2 = mst.ComputeMac();
if (!Evaluate.AreEqual(c1, c2))
{
throw new Exception("MacStreamTest: HMAC code arrays are not equal!");
}
}
// iterative hash function
private byte[] Func()
{
byte[] INT_block = _block.GetBigEndianBytes();
_hmac.TransformBlock(_salt, 0, _salt.Length, _salt, 0);
_hmac.TransformFinalBlock(INT_block, 0, INT_block.Length);
byte[] temp = _hmac.Hash;
_hmac.Initialize();
byte[] ret = temp;
for (int i = 2; i <= _iterationCount; i++)
{
temp = _hmac.ComputeHash(temp);
for (int j = 0; j < _blockSize; j++)
{
ret[j] ^= temp[j];
}
}
_block++;
return(ret);
}
private Boolean ValidateSignatureV1(IDictionary <String, String> parameters)
{
if (awsSecretKey == null)
{
throw new Exception("Secret key should be set");
}
string signature;
if (!String.IsNullOrEmpty(parameters[SIGNATURE_KEYNAME]))
{
signature = parameters[SIGNATURE_KEYNAME];
}
else
{
throw new Exception("'signature' is missing from the parameters.");
}
String sig;
try
{
var encoding = new ASCIIEncoding();
HMAC hmac = HMAC.Create("HmacSHA1");
hmac.Key = encoding.GetBytes(awsSecretKey);
hmac.Initialize();
var cs = new CryptoStream(Stream.Null, hmac, CryptoStreamMode.Write);
String stringToSign = CalculateStringToSignV1(parameters);
cs.Write(encoding.GetBytes(stringToSign), 0, encoding.GetBytes(stringToSign).Length);
cs.Close();
byte[] rawResult = hmac.Hash;
sig = Convert.ToBase64String(rawResult, 0, rawResult.Length);
}
catch (Exception e)
{
throw new Exception("Failed to generate HMAC : " + e.Message);
}
return(sig.Equals(signature));
}
private static bool IsSignatureValid(ByteArrayPart requestUri, string password)
{
if (string.IsNullOrEmpty(password))
{
return(false);
}
hmac.Initialize();
hmac.Key = Encoding.UTF8.GetBytes(password);
var part = requestUri;
var signature = hmac.ComputeHash(part.Bytes, part.Offset, part.Length - 5 - 32);
for (int i = 0; i < 16; i++)
{
if (HexEncoding.ParseHex2(parser.Signature, i * 2) != signature[i])
{
return(false);
}
}
return(true);
}
private byte[] ComputeBlock(int block, int size)
{
byte[] inputBuffer = BitConverter.GetBytes(block);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(inputBuffer, 0, 4);
}
_hashAlgo.TransformBlock(_salt, 0, _salt.Length, _salt, 0);
_hashAlgo.TransformFinalBlock(inputBuffer, 0, inputBuffer.Length);
byte[] hash = _hashAlgo.Hash;
_hashAlgo.Initialize();
byte[] result = hash;
for (int i = 2; i <= _iterations; i++)
{
hash = _hashAlgo.ComputeHash(hash);
for (int j = 0; j < size; j++)
{
result[j] = (byte)(result[j] ^ hash[j]);
}
}
return(result);
}
private static bool ValidateSignatureV1(NameValueCollection parameters)
{
String stringToSign = CalculateSignV1(parameters);
String signature = parameters[SIGNATURE_KEYNAME];
String sig;
try
{
ASCIIEncoding encoding = new ASCIIEncoding();
HMAC Hmac = HMAC.Create("HmacSHA1");
Hmac.Key = encoding.GetBytes(SimplePaySettings.SecretKey);
Hmac.Initialize();
CryptoStream cs = new CryptoStream(Stream.Null, Hmac, CryptoStreamMode.Write);
cs.Write(encoding.GetBytes(stringToSign), 0, encoding.GetBytes(stringToSign).Length);
cs.Close();
byte[] rawResult = Hmac.Hash;
sig = Convert.ToBase64String(rawResult, 0, rawResult.Length);
}
catch (Exception e)
{
throw new Exception("Failed to generate HMAC : " + e.Message);
}
return(sig.Equals(signature));
}
/// <summary>
/// Test the MacStream class implementation
/// <para>Throws an Exception on failure</</para>
/// </summary>
public static void StreamMacTest()
{
byte[] data;
byte[] key;
MemoryStream instrm;
MemoryStream outstrm = new MemoryStream();
using (KeyGenerator kg = new KeyGenerator())
{
data = kg.GetBytes(512);
key = kg.GetBytes(64);
}
// data to digest
instrm = new MemoryStream(data);
byte[] code1;
byte[] code2;
using (MacStream sm = new MacStream(new HMAC(new SHA512(), key)))
{
sm.Initialize(instrm);
code1 = sm.ComputeMac();
}
using (HMAC hm = new HMAC(new SHA512()))
{
hm.Initialize(key);
code2 = hm.ComputeMac(data);
}
// compare the hash codes
if (!Evaluate.AreEqual(code1, code2))
{
throw new Exception();
}
}
private void HMACTest(IDigest Digest, String[] Expected, byte[] TruncExpected)
{
HMAC mac = new HMAC(Digest);
byte[] macV2 = new byte[mac.MacSize];
for (int i = 0; i != _macKeys.Length; i++)
{
mac.Initialize(_macKeys[i]);
byte[] mData = HexConverter.Decode(_macData[i]);
byte[] macV = new byte[mac.MacSize];
mac.BlockUpdate(mData, 0, mData.Length);
mac.DoFinal(macV, 0);
if (Evaluate.AreEqual(HexConverter.Decode(Expected[i]), macV) == false)
{
throw new Exception("Keccak HMAC: Expected hash is not equal! Expected: " + Expected[i] + " Received: " + HexConverter.ToString(macV));
}
}
// test truncated keys
mac = new HMAC(Digest);
mac.Initialize(_truncKey);
mac.BlockUpdate(_truncData, 0, _truncData.Length);
mac.DoFinal(macV2, 0);
for (int i = 0; i != TruncExpected.Length; i++)
{
if (macV2[i] != TruncExpected[i])
{
throw new Exception("Keccak HMAC: Expected hash is not equal!");
}
}
}
private byte[] EncryptBytes(ICryptoTransform encryptor, ContentType contentType, ulong seqNum, byte[] plainBytes)
{
byte[] mac;
//记录有效负载保护
//加密和 MAC 功能将 TLS 压缩结构转换为 TLSCipher 文本。 解密功能反转该过程。
//记录的 MAC 还包括一个序列号，以便可检测到缺失、额外或重复的消息。
// struct {
// ContentType type;
// ProtocolVersion version;
// uint16 length;
// opaque fragment[TLSPlaintext.length];
// }
// TLSPlaintext;
if (SecurityParameters.MACAlgorithm != MACAlgorithm.Null)
{
byte[] versionAndType = new[] { (byte)contentType, m_SubProtocolVersion[0], m_SubProtocolVersion[1] };
byte[] seqNumBytes = BitConverter.GetBytes(seqNum).Reverse().ToArray(); //大端
byte[] messageSize = BitConverter.GetBytes((ushort)plainBytes.Length).Take(2).Reverse().ToArray(); //长度2字节
m_encryptionHMAC.Initialize();
m_encryptionHMAC.TransformBlock(seqNumBytes, 0, seqNumBytes.Length, seqNumBytes, 0);
m_encryptionHMAC.TransformBlock(versionAndType, 0, versionAndType.Length, versionAndType, 0);
m_encryptionHMAC.TransformBlock(messageSize, 0, messageSize.Length, messageSize, 0);
m_encryptionHMAC.TransformFinalBlock(plainBytes, 0, plainBytes.Length);
mac = m_encryptionHMAC.Hash;
}
else
{
mac = EmptyArray <byte> .Instance;
}
int length = plainBytes.Length + SecurityParameters.MACLength;
byte padding = 0;
if (SecurityParameters.BulkCipherAlgorithm != BulkCipherAlgorithm.Null)
{
padding = (byte)((encryptor.OutputBlockSize -
(plainBytes.Length + SecurityParameters.MACLength + 1) % encryptor.OutputBlockSize) %
encryptor.OutputBlockSize);
length += padding + 1;
}
byte[] cipherBytes = new byte[length];
Buffer.BlockCopy(plainBytes, 0, cipherBytes, 0, plainBytes.Length);
Buffer.BlockCopy(mac, 0, cipherBytes, plainBytes.Length, SecurityParameters.MACLength);
#if DEBUG
Debug.WriteLine("[TLSPlaintext]:" + BitConverter.ToString(cipherBytes));
Debug.WriteLine("[TLSPlaintext.data]:" + BitConverter.ToString(plainBytes));
Debug.WriteLine("[TLSPlaintext.mac]:" + BitConverter.ToString(mac));
Debug.WriteLine("[TLSPlaintext.padding]:" + padding);
#endif
if (SecurityParameters.BulkCipherAlgorithm != BulkCipherAlgorithm.Null)
{
for (int i = plainBytes.Length + SecurityParameters.MACLength; i < cipherBytes.Length; i++)
{
cipherBytes[i] = padding;
}
encryptor.TransformBlock(cipherBytes, 0, cipherBytes.Length, cipherBytes, 0);
}
return(cipherBytes);
}
public void CheckD(string testName, HMAC algo, byte[] data, byte[] result)
{
algo.TransformFinalBlock(data, 0, data.Length);
Compare(result, algo.Hash, testName + "d");
algo.Initialize();
}
void DecryptStream(Stream encryptedStream, Stream output)
{
using (BinaryReader reader = new BinaryReader(encryptedStream))
using (BinaryWriter writer = new BinaryWriter(output))
{
//Read file header
byte[] headerNonce;
byte[] ciphertextPayload;
byte[] mac;
byte[] contentKey;
byte[] cleartextPayload;
headerNonce = reader.ReadBytes(16);
ciphertextPayload = reader.ReadBytes(40);
mac = reader.ReadBytes(32);
HMAC headerHmac = new HMAC(macKey);
headerHmac.Update(headerNonce);
headerHmac.DoFinal(ciphertextPayload);
if (!headerHmac.Hash.SequenceEqual(mac))
{
throw new IOException("Encrypted file fails integrity check.");
}
cleartextPayload = AesCtr(ciphertextPayload, masterKey, headerNonce);
contentKey = Slice(cleartextPayload, 8, 32);
HMAC chunkHmac = new HMAC(macKey);
//Process all chunks
for (int blocknum = 0; ; ++blocknum)
{
//read file content payload
byte[] chunk;
chunk = reader.ReadBytes(32768 + 48);
if (chunk.Length == 0)
{
break;
}
var chunkNonce = Slice(chunk, 0, 16);
var chunkpayload = Slice(chunk, chunkNonce.Length, chunk.Length - 48);
var chunkmac = Slice(chunk, chunkNonce.Length + chunkpayload.Length, 32);
byte[] beBlockNum = BitConverter.GetBytes((long)blocknum);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(beBlockNum);
}
chunkHmac.Initialize();
chunkHmac.Update(headerNonce);
chunkHmac.Update(beBlockNum);
chunkHmac.Update(chunkNonce);
chunkHmac.DoFinal(chunkpayload);
if (!chunkHmac.Hash.SequenceEqual(chunkmac))
{
throw new IOException("Encrypted file fails integrity check.");
}
var decryptedContent = AesCtr(chunkpayload, contentKey, chunkNonce);
writer.Write(decryptedContent);
}
}
}
private static byte[] hmacSha(byte[] data, HMAC hmac)
{
hmac.Initialize();
return(hmac.ComputeHash(data));
}
