/// <summary>
/// Get the HashAlgorithmName from the given ALG_ID
/// </summary>
private static HashAlgorithmName?GetHashAlgorithmName(Interop.BCrypt.ECC_CURVE_ALG_ID_ENUM hashId)
{
Interop.Crypt32.CRYPT_OID_INFO oid = Interop.Crypt32.FindAlgIdOidInfo((int)hashId);
if (oid.AlgId == -1)
{
// The original hash algorithm may not be found and is optional
return(null);
}
return(new HashAlgorithmName(oid.Name));
}
/// <summary>
/// Get the ALG_ID from the given HashAlgorithmName
/// </summary>
private static Interop.BCrypt.ECC_CURVE_ALG_ID_ENUM GetHashAlgorithmId(HashAlgorithmName?name)
{
if (name.HasValue == false || string.IsNullOrEmpty(name.Value.Name))
{
return(Interop.BCrypt.ECC_CURVE_ALG_ID_ENUM.BCRYPT_NO_CURVE_GENERATION_ALG_ID);
}
Interop.Crypt32.CRYPT_OID_INFO oid = Interop.Crypt32.FindOidInfo(
Interop.Crypt32.CryptOidInfoKeyType.CRYPT_OID_INFO_NAME_KEY,
name.Value.Name,
OidGroup.HashAlgorithm,
false);
if (oid.AlgId == -1)
{
throw new CryptographicException(SR.GetString(SR.Cryptography_UnknownHashAlgorithm, name.Value.Name));
}
return((Interop.BCrypt.ECC_CURVE_ALG_ID_ENUM)oid.AlgId);
}