public override string Crypt(byte[] key, string salt)
{
CheckKey(key); Helper.CheckNull("salt", salt);
Match saltMatch = _regex.Match(salt);
if (!saltMatch.Success)
{
throw new ArgumentException("Invalid salt.", "salt");
}
int rounds = int.Parse(saltMatch.Groups[1].Value);
if (rounds < 4 || rounds > 31)
{
throw new ArgumentException("Invalid number of rounds.", "salt");
}
byte[] saltBytes = UnixBase64.Decode(saltMatch.Groups[2].Value, 128);
bool resized = key.Length < MaxKeyLength;
if (resized)
{
Array.Resize(ref key, key.Length + 1);
} // The ending null terminator is vital for compatibility
byte[] crypt = BlowfishCipher.BCrypt(key, saltBytes, rounds);
string result = string.Format("$2a${0}${1}{2}", rounds.ToString("00"),
new string(UnixBase64.Encode(saltBytes)),
new string(UnixBase64.Encode(crypt)));
Array.Clear(crypt, 0, crypt.Length); Array.Clear(saltBytes, 0, saltBytes.Length);
if (resized)
{
Array.Clear(key, 0, key.Length);
} // This is new since we resized it.
return(result);
}
public override string GenerateSalt(int rounds)
{
Helper.CheckRange("rounds", rounds, 4, 31);
return(string.Format("$2a${0}${1}", rounds.ToString("00"),
new string(UnixBase64.Encode(Crypter.GenerateSaltBytes(16)))));
}