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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Asn1.Eac;
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.Parameters;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Collections;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Cms
{
internal class CmsSignedHelper
{
internal static readonly CmsSignedHelper Instance = new CmsSignedHelper();
private static readonly string EncryptionECDsaWithSha1 = X9ObjectIdentifiers.ECDsaWithSha1.Id;
private static readonly string EncryptionECDsaWithSha224 = X9ObjectIdentifiers.ECDsaWithSha224.Id;
private static readonly string EncryptionECDsaWithSha256 = X9ObjectIdentifiers.ECDsaWithSha256.Id;
private static readonly string EncryptionECDsaWithSha384 = X9ObjectIdentifiers.ECDsaWithSha384.Id;
private static readonly string EncryptionECDsaWithSha512 = X9ObjectIdentifiers.ECDsaWithSha512.Id;
private static readonly IDictionary<string, string> m_encryptionAlgs = new Dictionary<string, string>();
private static readonly IDictionary<string, string> m_digestAlgs = new Dictionary<string, string>();
private static readonly IDictionary<string, string[]> m_digestAliases = new Dictionary<string, string[]>();
private static readonly HashSet<string> noParams = new HashSet<string>();
private static readonly IDictionary<string, string> m_ecAlgorithms = new Dictionary<string, string>();
private static void AddEntries(DerObjectIdentifier oid, string digest, string encryption)
{
string alias = oid.Id;
m_digestAlgs.Add(alias, digest);
m_encryptionAlgs.Add(alias, encryption);
}
static CmsSignedHelper()
{
AddEntries(NistObjectIdentifiers.DsaWithSha224, "SHA224", "DSA");
AddEntries(NistObjectIdentifiers.DsaWithSha256, "SHA256", "DSA");
AddEntries(NistObjectIdentifiers.DsaWithSha384, "SHA384", "DSA");
AddEntries(NistObjectIdentifiers.DsaWithSha512, "SHA512", "DSA");
AddEntries(OiwObjectIdentifiers.DsaWithSha1, "SHA1", "DSA");
AddEntries(OiwObjectIdentifiers.MD4WithRsa, "MD4", "RSA");
AddEntries(OiwObjectIdentifiers.MD4WithRsaEncryption, "MD4", "RSA");
AddEntries(OiwObjectIdentifiers.MD5WithRsa, "MD5", "RSA");
AddEntries(OiwObjectIdentifiers.Sha1WithRsa, "SHA1", "RSA");
AddEntries(PkcsObjectIdentifiers.MD2WithRsaEncryption, "MD2", "RSA");
AddEntries(PkcsObjectIdentifiers.MD4WithRsaEncryption, "MD4", "RSA");
AddEntries(PkcsObjectIdentifiers.MD5WithRsaEncryption, "MD5", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha1WithRsaEncryption, "SHA1", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha224WithRsaEncryption, "SHA224", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha256WithRsaEncryption, "SHA256", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha384WithRsaEncryption, "SHA384", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha512WithRsaEncryption, "SHA512", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha512_224WithRSAEncryption, "SHA512(224)", "RSA");
AddEntries(PkcsObjectIdentifiers.Sha512_256WithRSAEncryption, "SHA512(256)", "RSA");
AddEntries(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_224, "SHA3-224", "RSA");
AddEntries(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_256, "SHA3-256", "RSA");
AddEntries(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_384, "SHA3-384", "RSA");
AddEntries(NistObjectIdentifiers.IdRsassaPkcs1V15WithSha3_512, "SHA3-512", "RSA");
AddEntries(X9ObjectIdentifiers.ECDsaWithSha1, "SHA1", "ECDSA");
AddEntries(X9ObjectIdentifiers.ECDsaWithSha224, "SHA224", "ECDSA");
AddEntries(X9ObjectIdentifiers.ECDsaWithSha256, "SHA256", "ECDSA");
AddEntries(X9ObjectIdentifiers.ECDsaWithSha384, "SHA384", "ECDSA");
AddEntries(X9ObjectIdentifiers.ECDsaWithSha512, "SHA512", "ECDSA");
AddEntries(X9ObjectIdentifiers.IdDsaWithSha1, "SHA1", "DSA");
AddEntries(EacObjectIdentifiers.id_TA_ECDSA_SHA_1, "SHA1", "ECDSA");
AddEntries(EacObjectIdentifiers.id_TA_ECDSA_SHA_224, "SHA224", "ECDSA");
AddEntries(EacObjectIdentifiers.id_TA_ECDSA_SHA_256, "SHA256", "ECDSA");
AddEntries(EacObjectIdentifiers.id_TA_ECDSA_SHA_384, "SHA384", "ECDSA");
AddEntries(EacObjectIdentifiers.id_TA_ECDSA_SHA_512, "SHA512", "ECDSA");
AddEntries(EacObjectIdentifiers.id_TA_RSA_v1_5_SHA_1, "SHA1", "RSA");
AddEntries(EacObjectIdentifiers.id_TA_RSA_v1_5_SHA_256, "SHA256", "RSA");
AddEntries(EacObjectIdentifiers.id_TA_RSA_PSS_SHA_1, "SHA1", "RSAandMGF1");
AddEntries(EacObjectIdentifiers.id_TA_RSA_PSS_SHA_256, "SHA256", "RSAandMGF1");
m_encryptionAlgs.Add(X9ObjectIdentifiers.IdDsa.Id, "DSA");
m_encryptionAlgs.Add(PkcsObjectIdentifiers.RsaEncryption.Id, "RSA");
m_encryptionAlgs.Add(TeleTrusTObjectIdentifiers.TeleTrusTRsaSignatureAlgorithm.Id, "RSA");
m_encryptionAlgs.Add(X509ObjectIdentifiers.IdEARsa.Id, "RSA");
m_encryptionAlgs.Add(CmsSignedGenerator.EncryptionRsaPss, "RSAandMGF1");
m_encryptionAlgs.Add(CryptoProObjectIdentifiers.GostR3410x94.Id, "GOST3410");
m_encryptionAlgs.Add(CryptoProObjectIdentifiers.GostR3410x2001.Id, "ECGOST3410");
m_encryptionAlgs.Add("1.3.6.1.4.1.5849.1.6.2", "ECGOST3410");
m_encryptionAlgs.Add("1.3.6.1.4.1.5849.1.1.5", "GOST3410");
m_digestAlgs.Add(PkcsObjectIdentifiers.MD2.Id, "MD2");
m_digestAlgs.Add(PkcsObjectIdentifiers.MD4.Id, "MD4");
m_digestAlgs.Add(PkcsObjectIdentifiers.MD5.Id, "MD5");
m_digestAlgs.Add(OiwObjectIdentifiers.IdSha1.Id, "SHA1");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha224.Id, "SHA224");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha256.Id, "SHA256");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha384.Id, "SHA384");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha512.Id, "SHA512");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha512_224.Id, "SHA512(224)");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha512_256.Id, "SHA512(256)");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha3_224.Id, "SHA3-224");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha3_256.Id, "SHA3-256");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha3_384.Id, "SHA3-384");
m_digestAlgs.Add(NistObjectIdentifiers.IdSha3_512.Id, "SHA3-512");
m_digestAlgs.Add(TeleTrusTObjectIdentifiers.RipeMD128.Id, "RIPEMD128");
m_digestAlgs.Add(TeleTrusTObjectIdentifiers.RipeMD160.Id, "RIPEMD160");
m_digestAlgs.Add(TeleTrusTObjectIdentifiers.RipeMD256.Id, "RIPEMD256");
m_digestAlgs.Add(CryptoProObjectIdentifiers.GostR3411.Id, "GOST3411");
m_digestAlgs.Add("1.3.6.1.4.1.5849.1.2.1", "GOST3411");
m_digestAliases.Add("SHA1", new string[]{ "SHA-1" });
m_digestAliases.Add("SHA224", new string[]{ "SHA-224" });
m_digestAliases.Add("SHA256", new string[]{ "SHA-256" });
m_digestAliases.Add("SHA384", new string[]{ "SHA-384" });
m_digestAliases.Add("SHA512", new string[]{ "SHA-512" });
noParams.Add(CmsSignedGenerator.EncryptionDsa);
// noParams.Add(EncryptionECDsa);
noParams.Add(EncryptionECDsaWithSha1);
noParams.Add(EncryptionECDsaWithSha224);
noParams.Add(EncryptionECDsaWithSha256);
noParams.Add(EncryptionECDsaWithSha384);
noParams.Add(EncryptionECDsaWithSha512);
m_ecAlgorithms.Add(CmsSignedGenerator.DigestSha1, EncryptionECDsaWithSha1);
m_ecAlgorithms.Add(CmsSignedGenerator.DigestSha224, EncryptionECDsaWithSha224);
m_ecAlgorithms.Add(CmsSignedGenerator.DigestSha256, EncryptionECDsaWithSha256);
m_ecAlgorithms.Add(CmsSignedGenerator.DigestSha384, EncryptionECDsaWithSha384);
m_ecAlgorithms.Add(CmsSignedGenerator.DigestSha512, EncryptionECDsaWithSha512);
}
/**
* Return the digest algorithm using one of the standard JCA string
* representations rather than the algorithm identifier (if possible).
*/
internal string GetDigestAlgName(string digestAlgOid)
{
return m_digestAlgs.TryGetValue(digestAlgOid, out var algName) ? algName : digestAlgOid;
}
internal AlgorithmIdentifier GetEncAlgorithmIdentifier(DerObjectIdentifier encOid,
Asn1Encodable sigX509Parameters)
{
if (noParams.Contains(encOid.Id))
{
return new AlgorithmIdentifier(encOid);
}
return new AlgorithmIdentifier(encOid, sigX509Parameters);
}
internal string[] GetDigestAliases(string algName)
{
return m_digestAliases.TryGetValue(algName, out var aliases) ? (string[])aliases.Clone() : new string[0];
}
/**
* Return the digest encryption algorithm using one of the standard
* JCA string representations rather than the algorithm identifier (if
* possible).
*/
internal string GetEncryptionAlgName(string encryptionAlgOid)
{
return m_encryptionAlgs.TryGetValue(encryptionAlgOid, out var algName) ? algName : encryptionAlgOid;
}
internal IDigest GetDigestInstance(
string algorithm)
{
try
{
return DigestUtilities.GetDigest(algorithm);
}
catch (SecurityUtilityException e)
{
// This is probably superfluous on C#, since no provider infrastructure,
// assuming DigestUtilities already knows all the aliases
foreach (string alias in GetDigestAliases(algorithm))
{
try { return DigestUtilities.GetDigest(alias); }
catch (SecurityUtilityException) {}
}
throw e;
}
}
internal ISigner GetSignatureInstance(
string algorithm)
{
return SignerUtilities.GetSigner(algorithm);
}
internal AlgorithmIdentifier FixAlgID(
AlgorithmIdentifier algId)
{
if (algId.Parameters == null)
return new AlgorithmIdentifier(algId.Algorithm, DerNull.Instance);
return algId;
}
internal string GetEncOid(
AsymmetricKeyParameter key,
string digestOID)
{
string encOID = null;
if (key is RsaKeyParameters rsaKeyParameters)
{
if (!rsaKeyParameters.IsPrivate)
throw new ArgumentException("Expected RSA private key");
encOID = CmsSignedGenerator.EncryptionRsa;
}
else if (key is DsaPrivateKeyParameters)
{
if (digestOID.Equals(CmsSignedGenerator.DigestSha1))
{
encOID = CmsSignedGenerator.EncryptionDsa;
}
else if (digestOID.Equals(CmsSignedGenerator.DigestSha224))
{
encOID = NistObjectIdentifiers.DsaWithSha224.Id;
}
else if (digestOID.Equals(CmsSignedGenerator.DigestSha256))
{
encOID = NistObjectIdentifiers.DsaWithSha256.Id;
}
else if (digestOID.Equals(CmsSignedGenerator.DigestSha384))
{
encOID = NistObjectIdentifiers.DsaWithSha384.Id;
}
else if (digestOID.Equals(CmsSignedGenerator.DigestSha512))
{
encOID = NistObjectIdentifiers.DsaWithSha512.Id;
}
else
{
throw new ArgumentException("can't mix DSA with anything but SHA1/SHA2");
}
}
else if (key is ECPrivateKeyParameters ecPrivKey)
{
string algName = ecPrivKey.AlgorithmName;
if (algName == "ECGOST3410")
{
encOID = CmsSignedGenerator.EncryptionECGost3410;
}
else
{
// TODO Should we insist on algName being one of "EC" or "ECDSA", as Java does?
if (!m_ecAlgorithms.TryGetValue(digestOID, out encOID))
throw new ArgumentException("can't mix ECDSA with anything but SHA family digests");
}
}
else if (key is Gost3410PrivateKeyParameters)
{
encOID = CmsSignedGenerator.EncryptionGost3410;
}
else
{
throw new ArgumentException("Unknown algorithm in CmsSignedGenerator.GetEncOid");
}
return encOID;
}
internal IStore<X509V2AttributeCertificate> GetAttributeCertificates(Asn1Set attrCertSet)
{
var contents = new List<X509V2AttributeCertificate>();
if (attrCertSet != null)
{
foreach (Asn1Encodable ae in attrCertSet)
{
if (ae != null && ae.ToAsn1Object() is Asn1TaggedObject t)
{
if (t.HasContextTag(2))
{
Asn1Sequence s = Asn1Sequence.GetInstance(t, false);
contents.Add(new X509V2AttributeCertificate(AttributeCertificate.GetInstance(s)));
}
}
}
}
return CollectionUtilities.CreateStore(contents);
}
internal IStore<X509Certificate> GetCertificates(Asn1Set certSet)
{
var contents = new List<X509Certificate>();
if (certSet != null)
{
foreach (Asn1Encodable ae in certSet)
{
if (ae != null && ae.ToAsn1Object() is Asn1Sequence s)
{
contents.Add(new X509Certificate(X509CertificateStructure.GetInstance(s)));
}
}
}
return CollectionUtilities.CreateStore(contents);
}
internal IStore<X509Crl> GetCrls(Asn1Set crlSet)
{
var contents = new List<X509Crl>();
if (crlSet != null)
{
foreach (Asn1Encodable ae in crlSet)
{
if (ae != null && ae.ToAsn1Object() is Asn1Sequence s)
{
contents.Add(new X509Crl(CertificateList.GetInstance(s)));
}
}
}
return CollectionUtilities.CreateStore(contents);
}
}
}
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