bc-csharp/crypto/src/x509/X509SignatureUtil.cs at master · bcgit/bc-csharp · GitHub

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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.Rosstandart;
using Org.BouncyCastle.Asn1.TeleTrust;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Security;

namespace Org.BouncyCastle.X509
{
    internal class X509SignatureUtilities
    {
        /// <summary>
        /// Return the digest algorithm using one of the standard JCA string representations rather than the algorithm
        /// identifier (if possible).
        /// </summary>
        private static string GetDigestName(DerObjectIdentifier digestAlgOid)
        {
            /*
             * Note that this can't simply redirect to DigestUtilities because I think the Asn1Signature stuff
             * depends on particular digest names in some cases (e.g. non-hyphenated SHA algorithms).
             */

            if (PkcsObjectIdentifiers.MD5.Equals(digestAlgOid))
                return "MD5";

            if (OiwObjectIdentifiers.IdSha1.Equals(digestAlgOid))
                return "SHA1";

            if (NistObjectIdentifiers.IdSha224.Equals(digestAlgOid))
                return "SHA224";

            if (NistObjectIdentifiers.IdSha256.Equals(digestAlgOid))
                return "SHA256";

            if (NistObjectIdentifiers.IdSha384.Equals(digestAlgOid))
                return "SHA384";

            if (NistObjectIdentifiers.IdSha512.Equals(digestAlgOid))
                return "SHA512";

            if (NistObjectIdentifiers.IdSha512_224.Equals(digestAlgOid))
                return "SHA512(224)";

            if (NistObjectIdentifiers.IdSha512_256.Equals(digestAlgOid))
                return "SHA512(256)";

            if (TeleTrusTObjectIdentifiers.RipeMD128.Equals(digestAlgOid))
                return "RIPEMD128";

            if (TeleTrusTObjectIdentifiers.RipeMD160.Equals(digestAlgOid))
                return "RIPEMD160";

            if (TeleTrusTObjectIdentifiers.RipeMD256.Equals(digestAlgOid))
                return "RIPEMD256";

            if (CryptoProObjectIdentifiers.GostR3411.Equals(digestAlgOid))
                return "GOST3411";

            if (RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256.Equals(digestAlgOid))
                return "GOST3411-2012-256";

            if (RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512.Equals(digestAlgOid))
                return "GOST3411-2012-512";

            return digestAlgOid.GetID();
        }

        internal static string GetSignatureName(AlgorithmIdentifier sigAlgID)
        {
            DerObjectIdentifier sigAlgOid = sigAlgID.Algorithm;
            Asn1Encodable sigAlgParams = sigAlgID.Parameters;

            if (!X509Utilities.IsAbsentParameters(sigAlgParams))
            {
                if (PkcsObjectIdentifiers.IdRsassaPss.Equals(sigAlgOid))
                {
                    var rsassaPssParameters = RsassaPssParameters.GetInstance(sigAlgParams);

                    return GetDigestName(rsassaPssParameters.HashAlgorithm.Algorithm) + "withRSAandMGF1";
                }
                if (X9ObjectIdentifiers.ECDsaWithSha2.Equals(sigAlgOid))
                {
                    AlgorithmIdentifier ecDsaParams = AlgorithmIdentifier.GetInstance(sigAlgParams);

                    return GetDigestName(ecDsaParams.Algorithm) + "withECDSA";
                }
            }

            return SignerUtilities.GetEncodingName(sigAlgOid) ?? sigAlgOid.GetID();
        }
    }
}