/// <summary>
/// bcrypt_hash
/// </summary>
/// <param name="blowfish">blowfish object to use</param>
/// <param name="sha2pass">SHA512 of password</param>
/// <param name="sha2salt">SHA512 of salt</param>
/// <returns></returns>
private byte[] BcryptHash(Blowfish blowfish, byte[] sha2pass, byte[] sha2salt)
{
// this code is based on OpenBSD's bcrypt_pbkdf.c
const int BLOCKSIZE = 8;
// key expansion
blowfish.InitializeState();
blowfish.ExpandState(sha2pass, sha2salt);
for (int i = 0; i < 64; ++i)
{
blowfish.ExpandState(sha2salt);
blowfish.ExpandState(sha2pass);
}
// encryption
byte[] cdata = (byte[])_bcryptCipherText.Clone();
for (int i = 0; i < 64; ++i)
{
for (int j = 0; j < 32; j += BLOCKSIZE)
{
blowfish.BlockEncrypt(cdata, j, cdata, j);
}
}
// copy out
for (int i = 0; i < 32; i += 4)
{
byte b0 = cdata[i + 0];
byte b1 = cdata[i + 1];
byte b2 = cdata[i + 2];
byte b3 = cdata[i + 3];
cdata[i + 3] = b0;
cdata[i + 2] = b1;
cdata[i + 1] = b2;
cdata[i + 0] = b3;
}
return(cdata);
}
