private protected HashAlgorithm(string mechanism, KeySizes[] hashSizes, int hashSize)
{
if (!DetectionUtilities.ValidSize(hashSizes, hashSize))
{
throw new CryptographicException("Unsupported hash size.");
}
this.Mechanism = mechanism;
this.HashSize = hashSize;
}
private protected BlockAlgorithm(string mechanism, KeySizes[] blockSizes, int blockSize, KeySizes[] keySizes) : base(mechanism)
{
if (!DetectionUtilities.ValidSize(blockSizes, blockSize))
{
throw new CryptographicException("Unsupported block size.");
}
this.BlockSize = blockSize;
_keySizes = keySizes;
}
internal static bool TryGetNanoAlgorithm(string mechanism, out IHashAlgorithm algorithm)
{
string[] splits = mechanism.Split('-');
if (splits.Length >= 2 && splits.Length <= 3)
{
mechanism = string.Empty;
int hashSize = 0;
int stateSize = 0;
switch (splits[0])
{
case "BLAKE2B":
case "BLAKE2S":
if (int.TryParse(splits[1], out hashSize))
{
mechanism = splits[0];
}
break;
case "SHA":
if (splits.Length == 3)
{
if (splits[1] == "512" && int.TryParse(splits[2], out hashSize))
{
mechanism = "SHA512T";
}
}
break;
case "SHA512":
if (int.TryParse(splits[1], out hashSize))
{
mechanism = "SHA512T";
}
break;
case "SKEIN":
if (splits.Length == 3)
{
if (int.TryParse(splits[1], out stateSize) && int.TryParse(splits[2], out hashSize))
{
mechanism = splits[0];
}
}
break;
default: break;
}
if (mechanism.Length > 0)
{
bool legal;
switch (mechanism)
{
case "BLAKE2B":
{
legal = DetectionUtilities.ValidSize(BLAKE2b.HashSizes, hashSize);
algorithm = legal ? new BLAKE2b(hashSize) : null;
return(legal);
}
case "BLAKE2S":
{
legal = DetectionUtilities.ValidSize(BLAKE2s.HashSizes, hashSize);
algorithm = legal ? new BLAKE2s(hashSize) : null;
return(legal);
}
case "SHA512T":
{
legal = DetectionUtilities.ValidSize(SHA512T.HashSizes, hashSize);
algorithm = legal ? new SHA512T(hashSize) : null;
return(legal);
}
case "SKEIN":
{
legal = DetectionUtilities.ValidSize(Skein.HashSizes, hashSize);
legal &= DetectionUtilities.ValidSize(Skein.StateSizes, stateSize);
algorithm = legal ? new Skein(hashSize, stateSize) : null;
return(legal);
}
default: algorithm = null; return(false);
}
}
}
algorithm = null;
return(false);
}