/// <summary>
/// Uses the cipher to generate a BCrypt hash.
/// </summary>
/// <returns>A BCrypt hash.</returns>
public byte[] BCrypt()
{
uint[] magicWords = null;
byte[] magicBytes = null;
try
{
magicWords = (uint[])Magic.Clone();
for (int j = 0; j < magicWords.Length; j += 2)
{
for (int i = 0; i < 64; i++)
{
Encipher(ref magicWords[j], ref magicWords[j + 1]);
}
}
magicBytes = new byte[magicWords.Length * 4];
for (int i = 0; i < magicWords.Length; i++)
{
BitPacking.BEBytesFromUInt32(magicWords[i], magicBytes, i * 4);
}
return(ByteArray.TruncateAndCopy(magicBytes, magicBytes.Length - 1));
}
finally
{
Security.Clear(magicWords);
Security.Clear(magicBytes);
}
}
/// <summary>
/// Reverses the encipherment of eight bytes of data from one buffer and places the result in another buffer.
/// </summary>
/// <param name="inputBuffer">The buffer to read enciphered data from.</param>
/// <param name="inputOffset">The offset of the first enciphered byte.</param>
/// <param name="outputBuffer">The buffer to write plaintext data to.</param>
/// <param name="outputOffset">The offset at which to place the first plaintext byte.</param>
public void Decipher
(byte[] inputBuffer, int inputOffset,
byte[] outputBuffer, int outputOffset)
{
CheckCipherBuffers(inputBuffer, inputOffset, outputBuffer, outputOffset);
uint xl = BitPacking.UInt32FromBEBytes(inputBuffer, inputOffset + 0);
uint xr = BitPacking.UInt32FromBEBytes(inputBuffer, inputOffset + 4);
Decipher(ref xl, ref xr);
BitPacking.BEBytesFromUInt32(xl, outputBuffer, outputOffset + 0);
BitPacking.BEBytesFromUInt32(xr, outputBuffer, outputOffset + 4);
}
void ComputeBlock(uint pos)
{
BitPacking.BEBytesFromUInt32(pos, _saltBuffer, _saltBuffer.Length - 4);
ComputeHmac(_saltBuffer, _digestT1);
Array.Copy(_digestT1, _digest, _digestT1.Length);
for (int i = 1; i < _iterations; i++)
{
ComputeHmac(_digestT1, _digestT1);
for (int j = 0; j < _digest.Length; j++)
{
_digest[j] ^= _digestT1[j];
}
}
NBitcoin.Crypto.Internal.Security.Clear(_digestT1);
}
private void ComputeBlock(uint pos)
{
BitPacking.BEBytesFromUInt32(pos, this._saltBuffer, this._saltBuffer.Length - 4);
ComputeHmac(this._saltBuffer, this._digestT1);
Array.Copy(this._digestT1, this._digest, this._digestT1.Length);
for (int i = 1; i < this._iterations; i++)
{
ComputeHmac(this._digestT1, this._digestT1);
for (int j = 0; j < this._digest.Length; j++)
{
this._digest[j] ^= this._digestT1[j];
}
}
Security.Clear(this._digestT1);
}
