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using System;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.TeleTrust;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
namespace Org.BouncyCastle.X509
{
internal class X509SignatureUtilities
{
private static readonly Asn1Null derNull = DerNull.Instance;
internal static void SetSignatureParameters(
ISigner signature,
Asn1Encodable parameters)
{
if (parameters != null && !derNull.Equals(parameters))
{
// TODO Put back in
// AlgorithmParameters sigParams = AlgorithmParameters.GetInstance(signature.getAlgorithm());
//
// try
// {
// sigParams.Init(parameters.ToAsn1Object().GetDerEncoded());
// }
// catch (IOException e)
// {
// throw new SignatureException("IOException decoding parameters: " + e.Message);
// }
//
// if (signature.getAlgorithm().EndsWith("MGF1"))
// {
// try
// {
// signature.setParameter(sigParams.getParameterSpec(PSSParameterSpec.class));
// }
// catch (GeneralSecurityException e)
// {
// throw new SignatureException("Exception extracting parameters: " + e.Message);
// }
// }
}
}
internal static string GetSignatureName(
AlgorithmIdentifier sigAlgId)
{
Asn1Encodable parameters = sigAlgId.Parameters;
if (parameters != null && !derNull.Equals(parameters))
{
if (sigAlgId.Algorithm.Equals(PkcsObjectIdentifiers.IdRsassaPss))
{
RsassaPssParameters rsaParams = RsassaPssParameters.GetInstance(parameters);
return GetDigestAlgName(rsaParams.HashAlgorithm.Algorithm) + "withRSAandMGF1";
}
if (sigAlgId.Algorithm.Equals(X9ObjectIdentifiers.ECDsaWithSha2))
{
Asn1Sequence ecDsaParams = Asn1Sequence.GetInstance(parameters);
return GetDigestAlgName((DerObjectIdentifier)ecDsaParams[0]) + "withECDSA";
}
}
return sigAlgId.Algorithm.Id;
}
/**
* Return the digest algorithm using one of the standard JCA string
* representations rather than the algorithm identifier (if possible).
*/
private static string GetDigestAlgName(
DerObjectIdentifier digestAlgOID)
{
if (PkcsObjectIdentifiers.MD5.Equals(digestAlgOID))
{
return "MD5";
}
else if (OiwObjectIdentifiers.IdSha1.Equals(digestAlgOID))
{
return "SHA1";
}
else if (NistObjectIdentifiers.IdSha224.Equals(digestAlgOID))
{
return "SHA224";
}
else if (NistObjectIdentifiers.IdSha256.Equals(digestAlgOID))
{
return "SHA256";
}
else if (NistObjectIdentifiers.IdSha384.Equals(digestAlgOID))
{
return "SHA384";
}
else if (NistObjectIdentifiers.IdSha512.Equals(digestAlgOID))
{
return "SHA512";
}
else if (TeleTrusTObjectIdentifiers.RipeMD128.Equals(digestAlgOID))
{
return "RIPEMD128";
}
else if (TeleTrusTObjectIdentifiers.RipeMD160.Equals(digestAlgOID))
{
return "RIPEMD160";
}
else if (TeleTrusTObjectIdentifiers.RipeMD256.Equals(digestAlgOID))
{
return "RIPEMD256";
}
else if (CryptoProObjectIdentifiers.GostR3411.Equals(digestAlgOID))
{
return "GOST3411";
}
else
{
return digestAlgOID.Id;
}
}
}
}
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