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private pipeFrom ( |
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| src | ||
| lenLong | long | |
| return | long | |
public override Buf hmac(string algorithm, Buf keyBuf)
{
// get digest algorthim
string alg = algorithm;
if (alg == "SHA-1")
{
alg = "SHA1"; // to make .NET happy
}
HashAlgorithm ha = HashAlgorithm.Create(alg);
if (ha == null)
{
throw ArgErr.make("Unknown digest algorthm: " + algorithm).val;
}
// get secret key bytes
int blockSize = 64;
byte[] keyBytes = null;
int keySize = 0;
try
{
// get key bytes
MemBuf keyMemBuf = (MemBuf)keyBuf;
keyBytes = keyMemBuf.m_buf;
keySize = keyMemBuf.m_size;
// key is greater than block size we hash it first
if (keySize > blockSize)
{
keyBytes = ha.ComputeHash(keyBytes, 0, keySize);
keySize = keyBytes.Length;
}
}
catch (System.InvalidCastException)
{
throw UnsupportedErr.make("key parameter must be memory buffer").val;
}
// RFC 2104:
// ipad = the byte 0x36 repeated B times
// opad = the byte 0x5C repeated B times
// H(K XOR opad, H(K XOR ipad, text))
MemBuf acc = new MemBuf(1024);
// inner digest: H(K XOR ipad, text)
for (int i = 0; i < blockSize; ++i)
{
if (i < keySize)
{
acc.write((byte)(keyBytes[i] ^ 0x36));
}
else
{
acc.write((byte)0x36);
}
}
acc.pipeFrom(m_buf, 0, m_size);
byte[] innerDigest = ha.ComputeHash(acc.m_buf, 0, acc.m_size);
// outer digest: H(K XOR opad, innerDigest)
acc.clear();
for (int i = 0; i < blockSize; ++i)
{
if (i < keySize)
{
acc.write((byte)(keyBytes[i] ^ 0x5C));
}
else
{
acc.write((byte)0x5C);
}
}
acc.pipeFrom(innerDigest, 0, innerDigest.Length);
// return result
return(new MemBuf(ha.ComputeHash(acc.m_buf, 0, acc.m_size)));
}
public override Buf hmac(string algorithm, Buf keyBuf)
{
// get digest algorthim
string alg = algorithm;
if (alg == "SHA-1") alg = "SHA1"; // to make .NET happy
HashAlgorithm ha = HashAlgorithm.Create(alg);
if (ha == null)
throw ArgErr.make("Unknown digest algorthm: " + algorithm).val;
// get secret key bytes
int blockSize = 64;
byte[] keyBytes = null;
int keySize = 0;
try
{
// get key bytes
MemBuf keyMemBuf = (MemBuf)keyBuf;
keyBytes = keyMemBuf.m_buf;
keySize = keyMemBuf.m_size;
// key is greater than block size we hash it first
if (keySize > blockSize)
{
keyBytes = ha.ComputeHash(keyBytes, 0, keySize);
keySize = keyBytes.Length;
}
}
catch (System.InvalidCastException)
{
throw UnsupportedErr.make("key parameter must be memory buffer").val;
}
// RFC 2104:
// ipad = the byte 0x36 repeated B times
// opad = the byte 0x5C repeated B times
// H(K XOR opad, H(K XOR ipad, text))
MemBuf acc = new MemBuf(1024);
// inner digest: H(K XOR ipad, text)
for (int i=0; i<blockSize; ++i)
{
if (i < keySize)
acc.write((byte)(keyBytes[i] ^ 0x36));
else
acc.write((byte)0x36);
}
acc.pipeFrom(m_buf, 0, m_size);
byte[] innerDigest = ha.ComputeHash(acc.m_buf, 0, acc.m_size);
// outer digest: H(K XOR opad, innerDigest)
acc.clear();
for (int i=0; i<blockSize; ++i)
{
if (i < keySize)
acc.write((byte)(keyBytes[i] ^ 0x5C));
else
acc.write((byte)0x5C);
}
acc.pipeFrom(innerDigest, 0, innerDigest.Length);
// return result
return new MemBuf(ha.ComputeHash(acc.m_buf, 0, acc.m_size));
}
