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using System;
using System.Collections.Generic;
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;
using Org.BouncyCastle.Crypto.Operators;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.X509
{
internal static class X509Utilities
{
private static readonly Dictionary<string, DerObjectIdentifier> m_algorithms =
new Dictionary<string, DerObjectIdentifier>(StringComparer.OrdinalIgnoreCase);
private static readonly Dictionary<string, Asn1Encodable> m_exParams =
new Dictionary<string, Asn1Encodable>(StringComparer.OrdinalIgnoreCase);
private static readonly HashSet<DerObjectIdentifier> m_noParams = new HashSet<DerObjectIdentifier>();
static X509Utilities()
{
m_algorithms.Add("MD2WITHRSAENCRYPTION", PkcsObjectIdentifiers.MD2WithRsaEncryption);
m_algorithms.Add("MD2WITHRSA", PkcsObjectIdentifiers.MD2WithRsaEncryption);
m_algorithms.Add("MD5WITHRSAENCRYPTION", PkcsObjectIdentifiers.MD5WithRsaEncryption);
m_algorithms.Add("MD5WITHRSA", PkcsObjectIdentifiers.MD5WithRsaEncryption);
m_algorithms.Add("SHA1WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
m_algorithms.Add("SHA-1WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
m_algorithms.Add("SHA1WITHRSA", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
m_algorithms.Add("SHA-1WITHRSA", PkcsObjectIdentifiers.Sha1WithRsaEncryption);
m_algorithms.Add("SHA224WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
m_algorithms.Add("SHA-224WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
m_algorithms.Add("SHA224WITHRSA", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
m_algorithms.Add("SHA-224WITHRSA", PkcsObjectIdentifiers.Sha224WithRsaEncryption);
m_algorithms.Add("SHA256WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
m_algorithms.Add("SHA-256WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
m_algorithms.Add("SHA256WITHRSA", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
m_algorithms.Add("SHA-256WITHRSA", PkcsObjectIdentifiers.Sha256WithRsaEncryption);
m_algorithms.Add("SHA384WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
m_algorithms.Add("SHA-384WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
m_algorithms.Add("SHA384WITHRSA", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
m_algorithms.Add("SHA-384WITHRSA", PkcsObjectIdentifiers.Sha384WithRsaEncryption);
m_algorithms.Add("SHA512WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
m_algorithms.Add("SHA-512WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
m_algorithms.Add("SHA512WITHRSA", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
m_algorithms.Add("SHA-512WITHRSA", PkcsObjectIdentifiers.Sha512WithRsaEncryption);
m_algorithms.Add("SHA512(224)WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512_224WithRSAEncryption);
m_algorithms.Add("SHA-512(224)WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512_224WithRSAEncryption);
m_algorithms.Add("SHA512(224)WITHRSA", PkcsObjectIdentifiers.Sha512_224WithRSAEncryption);
m_algorithms.Add("SHA-512(224)WITHRSA", PkcsObjectIdentifiers.Sha512_224WithRSAEncryption);
m_algorithms.Add("SHA512(256)WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512_256WithRSAEncryption);
m_algorithms.Add("SHA-512(256)WITHRSAENCRYPTION", PkcsObjectIdentifiers.Sha512_256WithRSAEncryption);
m_algorithms.Add("SHA512(256)WITHRSA", PkcsObjectIdentifiers.Sha512_256WithRSAEncryption);
m_algorithms.Add("SHA-512(256)WITHRSA", PkcsObjectIdentifiers.Sha512_256WithRSAEncryption);
m_algorithms.Add("SHA1WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
m_algorithms.Add("SHA224WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
m_algorithms.Add("SHA256WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
m_algorithms.Add("SHA384WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
m_algorithms.Add("SHA512WITHRSAANDMGF1", PkcsObjectIdentifiers.IdRsassaPss);
m_algorithms.Add("RIPEMD160WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD160);
m_algorithms.Add("RIPEMD160WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD160);
m_algorithms.Add("RIPEMD128WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD128);
m_algorithms.Add("RIPEMD128WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD128);
m_algorithms.Add("RIPEMD256WITHRSAENCRYPTION", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD256);
m_algorithms.Add("RIPEMD256WITHRSA", TeleTrusTObjectIdentifiers.RsaSignatureWithRipeMD256);
m_algorithms.Add("SHA1WITHDSA", X9ObjectIdentifiers.IdDsaWithSha1);
m_algorithms.Add("DSAWITHSHA1", X9ObjectIdentifiers.IdDsaWithSha1);
m_algorithms.Add("SHA224WITHDSA", NistObjectIdentifiers.DsaWithSha224);
m_algorithms.Add("SHA256WITHDSA", NistObjectIdentifiers.DsaWithSha256);
m_algorithms.Add("SHA384WITHDSA", NistObjectIdentifiers.DsaWithSha384);
m_algorithms.Add("SHA512WITHDSA", NistObjectIdentifiers.DsaWithSha512);
m_algorithms.Add("SHA1WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha1);
m_algorithms.Add("ECDSAWITHSHA1", X9ObjectIdentifiers.ECDsaWithSha1);
m_algorithms.Add("SHA224WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha224);
m_algorithms.Add("SHA256WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha256);
m_algorithms.Add("SHA384WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha384);
m_algorithms.Add("SHA512WITHECDSA", X9ObjectIdentifiers.ECDsaWithSha512);
m_algorithms.Add("GOST3411WITHGOST3410", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
m_algorithms.Add("GOST3411WITHGOST3410-94", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
m_algorithms.Add("GOST3411WITHECGOST3410", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
m_algorithms.Add("GOST3411WITHECGOST3410-2001", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
m_algorithms.Add("GOST3411WITHGOST3410-2001", CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
//
// According to RFC 3279, the ASN.1 encoding SHALL (id-dsa-with-sha1) or MUST (ecdsa-with-SHA*) omit the parameters field.
// The parameters field SHALL be NULL for RSA based signature algorithms.
//
m_noParams.Add(X9ObjectIdentifiers.ECDsaWithSha1);
m_noParams.Add(X9ObjectIdentifiers.ECDsaWithSha224);
m_noParams.Add(X9ObjectIdentifiers.ECDsaWithSha256);
m_noParams.Add(X9ObjectIdentifiers.ECDsaWithSha384);
m_noParams.Add(X9ObjectIdentifiers.ECDsaWithSha512);
m_noParams.Add(X9ObjectIdentifiers.IdDsaWithSha1);
m_noParams.Add(OiwObjectIdentifiers.DsaWithSha1);
m_noParams.Add(NistObjectIdentifiers.DsaWithSha224);
m_noParams.Add(NistObjectIdentifiers.DsaWithSha256);
m_noParams.Add(NistObjectIdentifiers.DsaWithSha384);
m_noParams.Add(NistObjectIdentifiers.DsaWithSha512);
//
// RFC 4491
//
m_noParams.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x94);
m_noParams.Add(CryptoProObjectIdentifiers.GostR3411x94WithGostR3410x2001);
//
// explicit params
//
AlgorithmIdentifier sha1AlgId = new AlgorithmIdentifier(OiwObjectIdentifiers.IdSha1, DerNull.Instance);
m_exParams.Add("SHA1WITHRSAANDMGF1", CreatePssParams(sha1AlgId, 20));
AlgorithmIdentifier sha224AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha224, DerNull.Instance);
m_exParams.Add("SHA224WITHRSAANDMGF1", CreatePssParams(sha224AlgId, 28));
AlgorithmIdentifier sha256AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha256, DerNull.Instance);
m_exParams.Add("SHA256WITHRSAANDMGF1", CreatePssParams(sha256AlgId, 32));
AlgorithmIdentifier sha384AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha384, DerNull.Instance);
m_exParams.Add("SHA384WITHRSAANDMGF1", CreatePssParams(sha384AlgId, 48));
AlgorithmIdentifier sha512AlgId = new AlgorithmIdentifier(NistObjectIdentifiers.IdSha512, DerNull.Instance);
m_exParams.Add("SHA512WITHRSAANDMGF1", CreatePssParams(sha512AlgId, 64));
}
internal static byte[] CalculateDigest(AlgorithmIdentifier digestAlgorithm, Asn1Encodable asn1Encodable)
{
var digest = DigestUtilities.GetDigest(digestAlgorithm.Algorithm);
var digestCalculator = new DefaultDigestCalculator(digest);
var digestResult = CalculateResult(digestCalculator, asn1Encodable);
return digestResult.Collect();
}
internal static byte[] CalculateDigest(IDigestFactory digestFactory,
Asn1Encodable asn1Encodable)
{
var digestCalculator = digestFactory.CreateCalculator();
var digestResult = CalculateResult(digestCalculator, asn1Encodable);
return digestResult.Collect();
}
internal static TResult CalculateResult<TResult>(IStreamCalculator<TResult> streamCalculator,
Asn1Encodable asn1Encodable)
{
using (var stream = streamCalculator.Stream)
{
asn1Encodable.EncodeTo(stream, Asn1Encodable.Der);
}
return streamCalculator.GetResult();
}
private static RsassaPssParameters CreatePssParams(
AlgorithmIdentifier hashAlgId,
int saltSize)
{
return new RsassaPssParameters(
hashAlgId,
new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, hashAlgId),
new DerInteger(saltSize),
new DerInteger(1));
}
internal static DerBitString CollectDerBitString(IBlockResult result)
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
var maxResultLength = result.GetMaxResultLength();
Span<byte> data = maxResultLength <= 512
? stackalloc byte[maxResultLength]
: new byte[maxResultLength];
int resultLength = result.Collect(data);
data = data[..resultLength];
#else
var data = result.Collect();
#endif
return new DerBitString(data);
}
internal static DerObjectIdentifier GetAlgorithmOid(string algorithmName)
{
if (m_algorithms.TryGetValue(algorithmName, out var oid))
return oid;
return new DerObjectIdentifier(algorithmName);
}
internal static AlgorithmIdentifier GetSigAlgID(DerObjectIdentifier sigOid, string algorithmName)
{
if (m_noParams.Contains(sigOid))
return new AlgorithmIdentifier(sigOid);
if (m_exParams.TryGetValue(algorithmName, out var explicitParameters))
return new AlgorithmIdentifier(sigOid, explicitParameters);
return new AlgorithmIdentifier(sigOid, DerNull.Instance);
}
internal static IEnumerable<string> GetAlgNames()
{
return CollectionUtilities.Proxy(m_algorithms.Keys);
}
internal static DerBitString GenerateBitString(IStreamCalculator<IBlockResult> streamCalculator,
Asn1Encodable asn1Encodable)
{
var result = CalculateResult(streamCalculator, asn1Encodable);
return CollectDerBitString(result);
}
internal static DerBitString GenerateDigest(IDigestFactory digestFactory, Asn1Encodable asn1Encodable)
{
return GenerateBitString(digestFactory.CreateCalculator(), asn1Encodable);
}
internal static DerBitString GenerateMac(IMacFactory macFactory, Asn1Encodable asn1Encodable)
{
return GenerateBitString(macFactory.CreateCalculator(), asn1Encodable);
}
internal static DerBitString GenerateSignature(ISignatureFactory signatureFactory, Asn1Encodable asn1Encodable)
{
return GenerateBitString(signatureFactory.CreateCalculator(), asn1Encodable);
}
internal static bool VerifyMac(IMacFactory macFactory, Asn1Encodable asn1Encodable, DerBitString expected)
{
var result = CalculateResult(macFactory.CreateCalculator(), asn1Encodable);
return Arrays.FixedTimeEquals(result.Collect(), expected.GetOctets());
}
internal static bool VerifySignature(IVerifierFactory verifierFactory, Asn1Encodable asn1Encodable,
DerBitString signature)
{
var result = CalculateResult(verifierFactory.CreateCalculator(), asn1Encodable);
// TODO[api] Use GetOctetsSpan() once IsVerified(ReadOnlySpan<byte>) is available
return result.IsVerified(signature.GetOctets());
}
internal static Asn1TaggedObject TrimExtensions(int tagNo, X509Extensions exts)
{
Asn1Sequence extSeq = Asn1Sequence.GetInstance(exts.ToAsn1Object());
Asn1EncodableVector extV = new Asn1EncodableVector();
foreach (var extEntry in extSeq)
{
Asn1Sequence ext = Asn1Sequence.GetInstance(extEntry);
if (!X509Extensions.AltSignatureValue.Equals(ext[0]))
{
extV.Add(ext);
}
}
return new DerTaggedObject(true, tagNo, new DerSequence(extV));
}
}
}
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