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Diffstat (limited to 'crypto/src/operators/utilities/DefaultDigestAlgorithmFinder.cs')
| -rw-r--r-- | crypto/src/operators/utilities/DefaultDigestAlgorithmFinder.cs | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/crypto/src/operators/utilities/DefaultDigestAlgorithmFinder.cs b/crypto/src/operators/utilities/DefaultDigestAlgorithmFinder.cs new file mode 100644 index 000000000..025b94622 --- /dev/null +++ b/crypto/src/operators/utilities/DefaultDigestAlgorithmFinder.cs @@ -0,0 +1,326 @@ +using System; +using System.Collections.Generic; + +using Org.BouncyCastle.Asn1; +using Org.BouncyCastle.Asn1.BC; +using Org.BouncyCastle.Asn1.Bsi; +using Org.BouncyCastle.Asn1.Cms; +using Org.BouncyCastle.Asn1.CryptoPro; +using Org.BouncyCastle.Asn1.Eac; +using Org.BouncyCastle.Asn1.EdEC; +using Org.BouncyCastle.Asn1.GM; +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.Utilities.Collections; + +namespace Org.BouncyCastle.Operators.Utilities +{ + public class DefaultDigestAlgorithmFinder + : IDigestAlgorithmFinder + { + public static readonly DefaultDigestAlgorithmFinder Instance = new DefaultDigestAlgorithmFinder(); + + private static readonly Dictionary<DerObjectIdentifier, DerObjectIdentifier> DigestOids = + new Dictionary<DerObjectIdentifier, DerObjectIdentifier>(); + private static readonly Dictionary<string, DerObjectIdentifier> DigestNameToOids = + new Dictionary<string, DerObjectIdentifier>(StringComparer.OrdinalIgnoreCase); + private static readonly Dictionary<DerObjectIdentifier, AlgorithmIdentifier> DigestOidToAlgIDs = + new Dictionary<DerObjectIdentifier, AlgorithmIdentifier>(); + + // signatures that use SHAKE-256 + private static readonly HashSet<DerObjectIdentifier> Shake256Oids = new HashSet<DerObjectIdentifier>(); + + static DefaultDigestAlgorithmFinder() + { + // + // digests + // + DigestOids.Add(OiwObjectIdentifiers.DsaWithSha1, OiwObjectIdentifiers.IdSha1); + DigestOids.Add(OiwObjectIdentifiers.MD4WithRsaEncryption, PkcsObjectIdentifiers.MD4); + DigestOids.Add(OiwObjectIdentifiers.MD4WithRsa, PkcsObjectIdentifiers.MD4); + DigestOids.Add(OiwObjectIdentifiers.MD5WithRsa, PkcsObjectIdentifiers.MD5); + DigestOids.Add(OiwObjectIdentifiers.Sha1WithRsa, OiwObjectIdentifiers.IdSha1); + + DigestOids.Add(PkcsObjectIdentifiers.Sha224WithRsaEncryption, NistObjectIdentifiers.IdSha224); + DigestOids.Add(PkcsObjectIdentifiers.Sha256WithRsaEncryption, NistObjectIdentifiers.IdSha256); + DigestOids.Add(PkcsObjectIdentifiers.Sha384WithRsaEncryption, NistObjectIdentifiers.IdSha384); + DigestOids.Add(PkcsObjectIdentifiers.Sha512WithRsaEncryption, NistObjectIdentifiers.IdSha512); + DigestOids.Add(PkcsObjectIdentifiers.Sha512_224WithRSAEncryption, NistObjectIdentifiers.IdSha512_224); + DigestOids.Add(PkcsObjectIdentifiers.Sha512_256WithRSAEncryption, NistObjectIdentifiers.IdSha512_256); + DigestOids.Add(PkcsObjectIdentifiers.MD2WithRsaEncryption, PkcsObjectIdentifiers.MD2); + DigestOids.Add(PkcsObjectIdentifiers.MD4WithRsaEncryption, PkcsObjectIdentifiers.MD4); + DigestOids.Add(PkcsObjectIdentifiers.MD5WithRsaEncryption, PkcsObjectIdentifiers.MD5); + DigestOids.Add(PkcsObjectIdentifiers.Sha1WithRsaEncryption, OiwObjectIdentifiers.IdSha1); + + DigestOids.Add(X9ObjectIdentifiers.ECDsaWithSha1, OiwObjectIdentifiers.IdSha1); + DigestOids.Add(X9ObjectIdentifiers.ECDsaWithSha224, NistObjectIdentifiers.IdSha224); + DigestOids.Add(X9ObjectIdentifiers.ECDsaWithSha256, NistObjectIdentifiers.IdSha256); + DigestOids.Add(X9ObjectIdentifiers.ECDsaWithSha384, NistObjectIdentifiers.IdSha384); + DigestOids.Add(X9ObjectIdentifiers.ECDsaWithSha512, NistObjectIdentifiers.IdSha512); + DigestOids.Add(X9ObjectIdentifiers.IdDsaWithSha1, OiwObjectIdentifiers.IdSha1); + + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA1, OiwObjectIdentifiers.IdSha1); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA224, NistObjectIdentifiers.IdSha224); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA256, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA384, NistObjectIdentifiers.IdSha384); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA512, NistObjectIdentifiers.IdSha512); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA3_224, NistObjectIdentifiers.IdSha3_224); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA3_256, NistObjectIdentifiers.IdSha3_256); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA3_384, NistObjectIdentifiers.IdSha3_384); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_SHA3_512, NistObjectIdentifiers.IdSha3_512); + DigestOids.Add(BsiObjectIdentifiers.ecdsa_plain_RIPEMD160, TeleTrusTObjectIdentifiers.RipeMD160); + + DigestOids.Add(EacObjectIdentifiers.id_TA_ECDSA_SHA_1, OiwObjectIdentifiers.IdSha1); + DigestOids.Add(EacObjectIdentifiers.id_TA_ECDSA_SHA_224, NistObjectIdentifiers.IdSha224); + DigestOids.Add(EacObjectIdentifiers.id_TA_ECDSA_SHA_256, NistObjectIdentifiers.IdSha256); + DigestOids.Add(EacObjectIdentifiers.id_TA_ECDSA_SHA_384, NistObjectIdentifiers.IdSha384); + DigestOids.Add(EacObjectIdentifiers.id_TA_ECDSA_SHA_512, NistObjectIdentifiers.IdSha512); + + DigestOids.Add(NistObjectIdentifiers.DsaWithSha224, NistObjectIdentifiers.IdSha224); + DigestOids.Add(NistObjectIdentifiers.DsaWithSha256, NistObjectIdentifiers.IdSha256); + DigestOids.Add(NistObjectIdentifiers.DsaWithSha384, NistObjectIdentifiers.IdSha384); + DigestOids.Add(NistObjectIdentifiers.DsaWithSha512, NistObjectIdentifiers.IdSha512); + + DigestOids.Add(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_224, NistObjectIdentifiers.IdSha3_224); + DigestOids.Add(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_256, NistObjectIdentifiers.IdSha3_256); + DigestOids.Add(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_384, NistObjectIdentifiers.IdSha3_384); + DigestOids.Add(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_512, NistObjectIdentifiers.IdSha3_512); + DigestOids.Add(NistObjectIdentifiers.IdDsaWithSha3_224, NistObjectIdentifiers.IdSha3_224); + DigestOids.Add(NistObjectIdentifiers.IdDsaWithSha3_256, NistObjectIdentifiers.IdSha3_256); + DigestOids.Add(NistObjectIdentifiers.IdDsaWithSha3_384, NistObjectIdentifiers.IdSha3_384); + DigestOids.Add(NistObjectIdentifiers.IdDsaWithSha3_512, NistObjectIdentifiers.IdSha3_512); + DigestOids.Add(NistObjectIdentifiers.IdEcdsaWithSha3_224, NistObjectIdentifiers.IdSha3_224); + DigestOids.Add(NistObjectIdentifiers.IdEcdsaWithSha3_256, NistObjectIdentifiers.IdSha3_256); + DigestOids.Add(NistObjectIdentifiers.IdEcdsaWithSha3_384, NistObjectIdentifiers.IdSha3_384); + DigestOids.Add(NistObjectIdentifiers.IdEcdsaWithSha3_512, NistObjectIdentifiers.IdSha3_512); + + DigestOids.Add(TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD128, TeleTrusTObjectIdentifiers.RipeMD128); + DigestOids.Add(TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD160, TeleTrusTObjectIdentifiers.RipeMD160); + DigestOids.Add(TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD256, TeleTrusTObjectIdentifiers.RipeMD256); + + DigestOids.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94, CryptoProObjectIdentifiers.GostR3411); + DigestOids.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001, CryptoProObjectIdentifiers.GostR3411); + DigestOids.Add(RosstandartObjectIdentifiers.id_tc26_signwithdigest_gost_3410_12_256, RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256); + DigestOids.Add(RosstandartObjectIdentifiers.id_tc26_signwithdigest_gost_3410_12_512, RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512); + + DigestOids.Add(BCObjectIdentifiers.sphincs256_with_SHA3_512, NistObjectIdentifiers.IdSha3_512); + DigestOids.Add(BCObjectIdentifiers.sphincs256_with_SHA512, NistObjectIdentifiers.IdSha512); + + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_128s_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_128f_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_128s_r3, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_128f_r3, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_192s_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_192f_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_192s_r3, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_192f_r3, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_256s_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_256f_r3, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_256s_r3, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_256f_r3, NistObjectIdentifiers.IdShake256); + + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_128s_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_128f_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_128s_r3_simple, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_128f_r3_simple, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_192s_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_192f_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_192s_r3_simple, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_192f_r3_simple, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_256s_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_sha2_256f_r3_simple, NistObjectIdentifiers.IdSha256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_256s_r3_simple, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.sphincsPlus_shake_256f_r3_simple, NistObjectIdentifiers.IdShake256); + + DigestOids.Add(BCObjectIdentifiers.falcon, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.falcon_512, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.falcon_1024, NistObjectIdentifiers.IdShake256); + + DigestOids.Add(BCObjectIdentifiers.picnic_signature, NistObjectIdentifiers.IdShake256); + DigestOids.Add(BCObjectIdentifiers.picnic_with_sha512, NistObjectIdentifiers.IdSha512); + DigestOids.Add(BCObjectIdentifiers.picnic_with_sha3_512, NistObjectIdentifiers.IdSha3_512); + DigestOids.Add(BCObjectIdentifiers.picnic_with_shake256, NistObjectIdentifiers.IdShake256); + + //DigestOids.Add(GMObjectIdentifiers.sm2sign_with_rmd160, TeleTrusTObjectIdentifiers.RipeMD160); + //DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sha1, OiwObjectIdentifiers.IdSha1); + //DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sha224, NistObjectIdentifiers.IdSha224); + DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sha256, NistObjectIdentifiers.IdSha256); + //DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sha384, NistObjectIdentifiers.IdSha384); + //DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sha512, NistObjectIdentifiers.IdSha512); + DigestOids.Add(GMObjectIdentifiers.sm2sign_with_sm3, GMObjectIdentifiers.sm3); + + DigestOids.Add(CmsObjectIdentifiers.id_RSASSA_PSS_SHAKE128, NistObjectIdentifiers.IdShake128); + DigestOids.Add(CmsObjectIdentifiers.id_RSASSA_PSS_SHAKE256, NistObjectIdentifiers.IdShake256); + DigestOids.Add(CmsObjectIdentifiers.id_ecdsa_with_shake128, NistObjectIdentifiers.IdShake128); + DigestOids.Add(CmsObjectIdentifiers.id_ecdsa_with_shake256, NistObjectIdentifiers.IdShake256); + + DigestNameToOids.Add("SHA-1", OiwObjectIdentifiers.IdSha1); + DigestNameToOids.Add("SHA-224", NistObjectIdentifiers.IdSha224); + DigestNameToOids.Add("SHA-256", NistObjectIdentifiers.IdSha256); + DigestNameToOids.Add("SHA-384", NistObjectIdentifiers.IdSha384); + DigestNameToOids.Add("SHA-512", NistObjectIdentifiers.IdSha512); + DigestNameToOids.Add("SHA-512-224", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA-512/224", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA-512(224)", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA-512-256", NistObjectIdentifiers.IdSha512_256); + DigestNameToOids.Add("SHA-512/256", NistObjectIdentifiers.IdSha512_256); + DigestNameToOids.Add("SHA-512(256)", NistObjectIdentifiers.IdSha512_256); + + DigestNameToOids.Add("SHA1", OiwObjectIdentifiers.IdSha1); + DigestNameToOids.Add("SHA224", NistObjectIdentifiers.IdSha224); + DigestNameToOids.Add("SHA256", NistObjectIdentifiers.IdSha256); + DigestNameToOids.Add("SHA384", NistObjectIdentifiers.IdSha384); + DigestNameToOids.Add("SHA512", NistObjectIdentifiers.IdSha512); + DigestNameToOids.Add("SHA512-224", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA512/224", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA512(224)", NistObjectIdentifiers.IdSha512_224); + DigestNameToOids.Add("SHA512-256", NistObjectIdentifiers.IdSha512_256); + DigestNameToOids.Add("SHA512/256", NistObjectIdentifiers.IdSha512_256); + DigestNameToOids.Add("SHA512(256)", NistObjectIdentifiers.IdSha512_256); + + DigestNameToOids.Add("SHA3-224", NistObjectIdentifiers.IdSha3_224); + DigestNameToOids.Add("SHA3-256", NistObjectIdentifiers.IdSha3_256); + DigestNameToOids.Add("SHA3-384", NistObjectIdentifiers.IdSha3_384); + DigestNameToOids.Add("SHA3-512", NistObjectIdentifiers.IdSha3_512); + + DigestNameToOids.Add("SHAKE128", NistObjectIdentifiers.IdShake128); + DigestNameToOids.Add("SHAKE256", NistObjectIdentifiers.IdShake256); + DigestNameToOids.Add("SHAKE-128", NistObjectIdentifiers.IdShake128); + DigestNameToOids.Add("SHAKE-256", NistObjectIdentifiers.IdShake256); + + DigestNameToOids.Add("GOST3411", CryptoProObjectIdentifiers.GostR3411); + DigestNameToOids.Add("GOST3411-2012-256", RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256); + DigestNameToOids.Add("GOST3411-2012-512", RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512); + + DigestNameToOids.Add("MD2", PkcsObjectIdentifiers.MD2); + DigestNameToOids.Add("MD4", PkcsObjectIdentifiers.MD4); + DigestNameToOids.Add("MD5", PkcsObjectIdentifiers.MD5); + + DigestNameToOids.Add("RIPEMD128", TeleTrusTObjectIdentifiers.RipeMD128); + DigestNameToOids.Add("RIPEMD160", TeleTrusTObjectIdentifiers.RipeMD160); + DigestNameToOids.Add("RIPEMD256", TeleTrusTObjectIdentifiers.RipeMD256); + + DigestNameToOids.Add("SM3", GMObjectIdentifiers.sm3); + + // IETF RFC 3370 + AddDigestAlgID(OiwObjectIdentifiers.IdSha1, true); + // IETF RFC 5754 + AddDigestAlgID(NistObjectIdentifiers.IdSha224, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha256, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha384, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha512, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha512_224, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha512_256, false); + + // NIST CSOR + AddDigestAlgID(NistObjectIdentifiers.IdSha3_224, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha3_256, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha3_384, false); + AddDigestAlgID(NistObjectIdentifiers.IdSha3_512, false); + + // RFC 8702 + AddDigestAlgID(NistObjectIdentifiers.IdShake128, false); + AddDigestAlgID(NistObjectIdentifiers.IdShake256, false); + + // RFC 4357 + AddDigestAlgID(CryptoProObjectIdentifiers.GostR3411, true); + + // draft-deremin-rfc4491 + AddDigestAlgID(RosstandartObjectIdentifiers.id_tc26_gost_3411_12_256, false); + AddDigestAlgID(RosstandartObjectIdentifiers.id_tc26_gost_3411_12_512, false); + + // IETF RFC 1319 + AddDigestAlgID(PkcsObjectIdentifiers.MD2, true); + // IETF RFC 1320 + AddDigestAlgID(PkcsObjectIdentifiers.MD4, true); + // IETF RFC 1321 + AddDigestAlgID(PkcsObjectIdentifiers.MD5, true); + + // found no standard which specified the handle of AlgorithmIdentifier.parameters, + // so let it as before. + AddDigestAlgID(TeleTrusTObjectIdentifiers.RipeMD128, true); + AddDigestAlgID(TeleTrusTObjectIdentifiers.RipeMD160, true); + AddDigestAlgID(TeleTrusTObjectIdentifiers.RipeMD256, true); + + Shake256Oids.Add(EdECObjectIdentifiers.id_Ed448); + + Shake256Oids.Add(BCObjectIdentifiers.dilithium2); + Shake256Oids.Add(BCObjectIdentifiers.dilithium3); + Shake256Oids.Add(BCObjectIdentifiers.dilithium5); + Shake256Oids.Add(BCObjectIdentifiers.dilithium2_aes); + Shake256Oids.Add(BCObjectIdentifiers.dilithium3_aes); + Shake256Oids.Add(BCObjectIdentifiers.dilithium5_aes); + + Shake256Oids.Add(BCObjectIdentifiers.falcon_512); + Shake256Oids.Add(BCObjectIdentifiers.falcon_1024); + } + + private static void AddDigestAlgID(DerObjectIdentifier oid, bool withNullParams) => + DigestOidToAlgIDs.Add(oid, new AlgorithmIdentifier(oid, withNullParams ? DerNull.Instance : null)); + + protected DefaultDigestAlgorithmFinder() + { + } + + public virtual AlgorithmIdentifier Find(AlgorithmIdentifier signatureAlgorithm) + { + DerObjectIdentifier signatureOid = signatureAlgorithm.Algorithm; + + if (Shake256Oids.Contains(signatureOid)) + return new AlgorithmIdentifier(NistObjectIdentifiers.IdShake256Len, new DerInteger(512)); + + DerObjectIdentifier digestOid; + if (PkcsObjectIdentifiers.IdRsassaPss.Equals(signatureOid)) + { + digestOid = RsassaPssParameters.GetInstance(signatureAlgorithm.Parameters).HashAlgorithm.Algorithm; + } + else if (EdECObjectIdentifiers.id_Ed25519.Equals(signatureOid)) + { + digestOid = NistObjectIdentifiers.IdSha512; + } + else if (PkcsObjectIdentifiers.IdAlgHssLmsHashsig.Equals(signatureOid)) + { + digestOid = NistObjectIdentifiers.IdSha256; + } + else + { + digestOid = CollectionUtilities.GetValueOrNull(DigestOids, signatureOid); + } + + return Find(digestOid); + } + + public virtual AlgorithmIdentifier Find(DerObjectIdentifier digestOid) + { + if (digestOid == null) + throw new ArgumentNullException(nameof(digestOid)); + + if (DigestOidToAlgIDs.TryGetValue(digestOid, out var digestAlgorithm)) + return digestAlgorithm; + + return new AlgorithmIdentifier(digestOid); + } + + public virtual AlgorithmIdentifier Find(string digestName) + { + if (DigestNameToOids.TryGetValue(digestName, out var digestOid)) + return Find(digestOid); + + try + { + return Find(new DerObjectIdentifier(digestName)); + } + catch (Exception) + { + // ignore - tried it but it didn't work... + } + + return null; + } + } +} |