/// <summary>
/// Initializes a new instance of the <see cref="HmacAuthenticationParameters"/> class.
/// </summary>
/// <param name="algorithm">The hash algorithm to use for the computation.</param>
/// <param name="privateKey">The secret key for the hashed encryption. The key can be any length, but it is strongly recommended to use a size of either 64 bytes (for <see cref="HmacAlgorithmType.SHA1"/> and <see cref="HmacAlgorithmType.SHA256"/>) or 128 bytes (for <see cref="HmacAlgorithmType.SHA384"/> and <see cref="HmacAlgorithmType.SHA512"/>).</param>
/// <param name="message">The <see cref="string"/> value to compute a hash code for.</param>
internal HmacAuthenticationParameters(HmacAlgorithmType algorithm, byte[] privateKey, string message)
{
Algorithm = algorithm;
Message = message;
PrivateKey = privateKey;
}
private static HashResult ComputeHashCore(Stream value, byte[] hash, byte[] sharedKey, HmacAlgorithmType algorithmType, bool leaveStreamOpen)
{
if (algorithmType > HmacAlgorithmType.SHA512 || algorithmType < HmacAlgorithmType.SHA1)
{
throw new ArgumentOutOfRangeException(nameof(algorithmType), "Specified argument was out of the range of valid values.");
}
HashAlgorithm algorithm;
switch (algorithmType)
{
case HmacAlgorithmType.SHA1:
goto default;
case HmacAlgorithmType.SHA256:
algorithm = new HMACSHA256(sharedKey);
break;
case HmacAlgorithmType.SHA384:
algorithm = new HMACSHA384(sharedKey);
break;
case HmacAlgorithmType.SHA512:
algorithm = new HMACSHA512(sharedKey);
break;
default:
algorithm = new HMACSHA1(sharedKey);
break;
}
return(HashUtility.ComputeHashCore(value, hash, leaveStreamOpen, algorithm));
}
