/// <summary>
/// MAC.
/// <para/>Legal mac size is between 8 and block size (8 bits increments).
/// <para/>Legal mac size must be at least 24 bits (FIPS Publication 81) or 16 bits if being used as a data authenticator (FIPS Publication 113).
/// <para/>Used (block size / 2) as mac size by default.
/// </summary>
/// <param name="blockAlgorithm">Symmetric block algorithm.</param>
/// <param name="macSize">MAC size bits.</param>
public MAC(IBlockAlgorithm blockAlgorithm, int macSize)
{
if (macSize < 8 || macSize > blockAlgorithm.BlockSize || macSize % 8 != 0)
{
throw new CryptographicException("Legal mac size is between 8 and block size (8 bits increments).");
}
this.Mechanism = string.Format(CultureInfo.InvariantCulture, "{0}/MAC", blockAlgorithm.Mechanism);
this.BlockAlgorithm = (BlockAlgorithm)blockAlgorithm;
this.HashSize = macSize;
}
/// <summary>
/// CMAC.
/// <para/>Legal mac size is between 8 and block size (8 bits increments).
/// <para/>Used block size as mac size by default.
/// </summary>
/// <param name="blockAlgorithm">Symmetric block algorithm.</param>
public CMAC(IBlockAlgorithm blockAlgorithm) : this(blockAlgorithm, blockAlgorithm.BlockSize)
{
}
/// <summary>
/// Try get algorithm from mechanism.
/// </summary>
/// <param name="mechanism">Algorithm mechanism.</param>
/// <param name="algorithm">Algorithm.</param>
/// <returns></returns>
public static bool TryGetAlgorithm(string mechanism, out IBlockAlgorithm algorithm)
{
mechanism = mechanism.Replace('_', '-').Replace('/', '-').ToUpperInvariant();
switch (mechanism)
{
case "AES": algorithm = AES; return(true);
case "BLOWFISH": algorithm = Blowfish; return(true);
case "CAMELLIA": algorithm = Camellia; return(true);
case "CAST5": algorithm = CAST5; return(true);
case "CAST6": algorithm = CAST6; return(true);
case "DES": algorithm = DES; return(true);
case "DESEDE":
case "DESEDE3":
case "TDEA":
case "TRIPLEDES":
case "3DES": algorithm = DESede; return(true);
case "DSTU7624-128": algorithm = DSTU7624_128; return(true);
case "DSTU7624-256": algorithm = DSTU7624_256; return(true);
case "DSTU7624-512": algorithm = DSTU7624_512; return(true);
case "GOST28147": algorithm = GOST28147; return(true);
case "IDEA": algorithm = IDEA; return(true);
case "NOEKEON": algorithm = Noekeon; return(true);
case "RC2": algorithm = RC2; return(true);
case "RC5":
case "RC5-32": algorithm = RC5; return(true);
case "RC5-64": algorithm = RC5_64; return(true);
case "RC6": algorithm = RC6; return(true);
case "RIJNDAEL-128":
case "RIJNDAEL128": algorithm = Rijndael_128; return(true);
case "RIJNDAEL-160":
case "RIJNDAEL160": algorithm = Rijndael_160; return(true);
case "RIJNDAEL-192":
case "RIJNDAEL192": algorithm = Rijndael_192; return(true);
case "RIJNDAEL-224":
case "RIJNDAEL224": algorithm = Rijndael_224; return(true);
case "RIJNDAEL-256":
case "RIJNDAEL256": algorithm = Rijndael_256; return(true);
case "SEED": algorithm = SEED; return(true);
case "SERPENT": algorithm = Serpent; return(true);
case "SKIPJACK": algorithm = SKIPJACK; return(true);
case "SM4": algorithm = SM4; return(true);
case "TEA": algorithm = TEA; return(true);
case "THREEFISH-256":
case "THREEFISH256": algorithm = Threefish_256; return(true);
case "THREEFISH-512":
case "THREEFISH512": algorithm = Threefish_512; return(true);
case "THREEFISH-1024":
case "THREEFISH1024": algorithm = Threefish_1024; return(true);
case "TNEPRES": algorithm = Tnepres; return(true);
case "TWOFISH": algorithm = Twofish; return(true);
case "XTEA": algorithm = XTEA; return(true);
default: algorithm = null; return(false);
}
}
