/// <summary>
/// Creates parameters for the CKM_RSA_PKCS_PSS mechanism
/// </summary>
/// <param name='hashAlg'>Hash algorithm used in the PSS encoding (CKM)</param>
/// <param name='mgf'>Mask generation function to use on the encoded block (CKG)</param>
/// <param name='len'>Length, in bytes, of the salt value used in the PSS encoding</param>
/// <returns>Parameters for the CKM_RSA_PKCS_PSS mechanism</returns>
public ICkRsaPkcsPssParams CreateCkRsaPkcsPssParams(ulong hashAlg, ulong mgf, ulong len)
{
return _factory.CreateCkRsaPkcsPssParams(hashAlg, mgf, len);
}
/// <summary>
/// Creates parameters for CKM_RSA_PKCS_PSS mechanism
/// </summary>
/// <param name="mechanismParamsFactory">Factory for creation of IMechanismParams instances</param>
/// <param name="hash">Hash value</param>
/// <param name="hashAlgorithm">Hash algorithm</param>
/// <returns>Parameters for CKM_RSA_PKCS_PSS mechanism or null</returns>
private static ICkRsaPkcsPssParams CreateCkRsaPkcsPssParams(IMechanismParamsFactory mechanismParamsFactory, byte[] hash, HashAlgorithmName hashAlgorithm)
{
if (hash == null || hash.Length == 0)
{
throw new ArgumentNullException(nameof(hash));
}
ICkRsaPkcsPssParams pssParams = null;
if (hashAlgorithm == HashAlgorithmName.SHA1)
{
if (hash.Length != 20)
{
throw new ArgumentException("Invalid lenght of hash value");
}
pssParams = mechanismParamsFactory.CreateCkRsaPkcsPssParams(
hashAlg: (ulong)CKM.CKM_SHA_1,
mgf: (ulong)CKG.CKG_MGF1_SHA1,
len: (ulong)hash.Length
);
}
else if (hashAlgorithm == HashAlgorithmName.SHA256)
{
if (hash.Length != 32)
{
throw new ArgumentException("Invalid lenght of hash value");
}
pssParams = mechanismParamsFactory.CreateCkRsaPkcsPssParams(
hashAlg: (ulong)CKM.CKM_SHA256,
mgf: (ulong)CKG.CKG_MGF1_SHA256,
len: (ulong)hash.Length
);
}
else if (hashAlgorithm == HashAlgorithmName.SHA384)
{
if (hash.Length != 48)
{
throw new ArgumentException("Invalid lenght of hash value");
}
pssParams = mechanismParamsFactory.CreateCkRsaPkcsPssParams(
hashAlg: (ulong)CKM.CKM_SHA384,
mgf: (ulong)CKG.CKG_MGF1_SHA384,
len: (ulong)hash.Length
);
}
else if (hashAlgorithm == HashAlgorithmName.SHA512)
{
if (hash.Length != 64)
{
throw new ArgumentException("Invalid lenght of hash value");
}
pssParams = mechanismParamsFactory.CreateCkRsaPkcsPssParams(
hashAlg: (ulong)CKM.CKM_SHA512,
mgf: (ulong)CKG.CKG_MGF1_SHA512,
len: (ulong)hash.Length
);
}
return(pssParams);
}