public static byte[] HmacData(TpmAlgId hashAlgId, byte[] key, byte[] dataToHash)
{
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(hashAlgId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw <ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return(null);
}
var alg = new BCryptAlgorithm(algName, Native.BCRYPT_ALG_HANDLE_HMAC);
var digest = alg.HmacData(key, dataToHash);
alg.Close();
return(digest);
#else
switch (hashAlgId)
{
case TpmAlgId.Sha1:
using (var h = new HMACSHA1(key))
{
return(h.ComputeHash(dataToHash));
}
case TpmAlgId.Sha256:
using (var h2 = new HMACSHA256(key))
{
return(h2.ComputeHash(dataToHash));
}
case TpmAlgId.Sha384:
using (var h3 = new HMACSHA384(key))
{
return(h3.ComputeHash(dataToHash));
}
case TpmAlgId.Sha512:
using (var h4 = new HMACSHA512(key))
{
return(h4.ComputeHash(dataToHash));
}
default:
Globs.Throw <ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return(null);
}
#endif // !TSS_USE_BCRYPT
}
public static byte[] Mac(TpmAlgId symAlg, TpmAlgId macScheme, byte[] key, byte[] data)
{
if (symAlg != TpmAlgId.Aes)
{
Globs.Throw <ArgumentException>("CryptoLib.Mac(): Unsupported symmetric algorithm" + symAlg);
return(null);
}
if (macScheme != TpmAlgId.Cmac)
{
Globs.Throw <ArgumentException>("CryptoLib.Mac(): Unsupported MAC scheme " + macScheme);
return(null);
}
#if TSS_USE_BCRYPT
var alg = new BCryptAlgorithm(Native.BCRYPT_AES_CMAC_ALGORITHM);
var digest = alg.HmacData(key, data);
alg.Close();
return(digest);
#else
Globs.Throw <ArgumentException>("Mac(): .Net Crypto API does not support symmetric cipher based MAC." +
"Complile TSS.Net with BCrypt enabled.");
return(null);
#endif // !TSS_USE_BCRYPT
}
public static byte[] HmacData(TpmAlgId hashAlgId, byte[] key, byte[] dataToHash)
{
#if TSS_USE_BCRYPT
string algName = Native.BCryptHashAlgName(hashAlgId);
if (string.IsNullOrEmpty(algName))
{
Globs.Throw<ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return null;
}
var alg = new BCryptAlgorithm(algName, Native.BCRYPT_ALG_HANDLE_HMAC);
var digest = alg.HmacData(key, dataToHash);
alg.Close();
return digest;
#else
switch (hashAlgId)
{
case TpmAlgId.Sha1:
using (var h = new HMACSHA1(key))
{
return h.ComputeHash(dataToHash);
}
case TpmAlgId.Sha256:
using (var h2 = new HMACSHA256(key))
{
return h2.ComputeHash(dataToHash);
}
case TpmAlgId.Sha384:
using (var h3 = new HMACSHA384(key))
{
return h3.ComputeHash(dataToHash);
}
case TpmAlgId.Sha512:
using (var h4 = new HMACSHA512(key))
{
return h4.ComputeHash(dataToHash);
}
default:
Globs.Throw<ArgumentException>("HmacData(): Unsupported hash algorithm " + hashAlgId);
return null;
}
#endif // !TSS_USE_BCRYPT
}
