/// <summary>
/// Gets the BCrypt (or NCrypt) algorithm identifier for an asymmetric algorithm.
/// </summary>
/// <param name="algorithm">The PCL asymmetric algorithm.</param>
/// <returns>The BCrypt/NCrypt compatible algorithm identifier.</returns>
internal static string GetAlgorithmId(AsymmetricAlgorithm algorithm)
{
switch (algorithm.GetName())
{
case AsymmetricAlgorithmName.Dsa:
return(BCrypt.AlgorithmIdentifiers.BCRYPT_DSA_ALGORITHM);
case AsymmetricAlgorithmName.Ecdsa:
switch (GetAlgorithmKeySize(algorithm))
{
case 256:
return(BCrypt.AlgorithmIdentifiers.BCRYPT_ECDSA_P256_ALGORITHM);
case 384:
return(BCrypt.AlgorithmIdentifiers.BCRYPT_ECDSA_P384_ALGORITHM);
case 521:
return(BCrypt.AlgorithmIdentifiers.BCRYPT_ECDSA_P521_ALGORITHM);
default:
throw new ArgumentOutOfRangeException();
}
case AsymmetricAlgorithmName.Rsa:
case AsymmetricAlgorithmName.RsaSign:
return(BCrypt.AlgorithmIdentifiers.BCRYPT_RSA_ALGORITHM);
default:
throw new NotSupportedException();
}
}
/// <summary>Initializes a new instance of the <see cref="RsaAsymmetricKeyAlgorithmProvider"/> class.</summary>
/// <param name="algorithm">The algorithm.</param>
public RsaAsymmetricKeyAlgorithmProvider(AsymmetricAlgorithm algorithm)
: base(algorithm)
{
var algorithmName = algorithm.GetName();
Requires.Argument(algorithmName == AsymmetricAlgorithmName.Rsa || algorithmName == AsymmetricAlgorithmName.RsaSign, nameof(algorithm), "RSA algorithm expected.");
}
/// <inheritdoc />
public IAsymmetricKeyAlgorithmProvider OpenAlgorithm(AsymmetricAlgorithm algorithm)
{
switch (algorithm.GetName())
{
case AsymmetricAlgorithmName.Ecdsa:
return(new ECDsaKeyProvider(algorithm));
case AsymmetricAlgorithmName.Rsa:
case AsymmetricAlgorithmName.RsaSign:
return(new RsaAsymmetricKeyAlgorithmProvider(algorithm));
case AsymmetricAlgorithmName.Dsa:
default:
throw new NotSupportedException();
}
}