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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cryptlib;
using Org.BouncyCastle.Asn1.CryptoPro;
using Org.BouncyCastle.Asn1.EdEC;
using Org.BouncyCastle.Asn1.Gnu;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.Rosstandart;
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Security
{
public static class PrivateKeyFactory
{
public static AsymmetricKeyParameter CreateKey(
byte[] privateKeyInfoData)
{
return CreateKey(
PrivateKeyInfo.GetInstance(
Asn1Object.FromByteArray(privateKeyInfoData)));
}
public static AsymmetricKeyParameter CreateKey(
Stream inStr)
{
return CreateKey(
PrivateKeyInfo.GetInstance(
Asn1Object.FromStream(inStr)));
}
public static AsymmetricKeyParameter CreateKey(
PrivateKeyInfo keyInfo)
{
AlgorithmIdentifier algID = keyInfo.PrivateKeyAlgorithm;
DerObjectIdentifier algOid = algID.Algorithm;
// TODO See RSAUtil.isRsaOid in Java build
if (algOid.Equals(PkcsObjectIdentifiers.RsaEncryption)
|| algOid.Equals(X509ObjectIdentifiers.IdEARsa)
|| algOid.Equals(PkcsObjectIdentifiers.IdRsassaPss)
|| algOid.Equals(PkcsObjectIdentifiers.IdRsaesOaep))
{
RsaPrivateKeyStructure keyStructure = RsaPrivateKeyStructure.GetInstance(keyInfo.ParsePrivateKey());
return new RsaPrivateCrtKeyParameters(
keyStructure.Modulus,
keyStructure.PublicExponent,
keyStructure.PrivateExponent,
keyStructure.Prime1,
keyStructure.Prime2,
keyStructure.Exponent1,
keyStructure.Exponent2,
keyStructure.Coefficient);
}
// TODO?
// else if (algOid.Equals(X9ObjectIdentifiers.DHPublicNumber))
else if (algOid.Equals(PkcsObjectIdentifiers.DhKeyAgreement))
{
DHParameter para = DHParameter.GetInstance(algID.Parameters);
DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey();
BigInteger lVal = para.L;
int l = lVal == null ? 0 : lVal.IntValue;
DHParameters dhParams = new DHParameters(para.P, para.G, null, l);
return new DHPrivateKeyParameters(derX.Value, dhParams, algOid);
}
else if (algOid.Equals(OiwObjectIdentifiers.ElGamalAlgorithm))
{
ElGamalParameter para = new ElGamalParameter(
Asn1Sequence.GetInstance(algID.Parameters.ToAsn1Object()));
DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey();
return new ElGamalPrivateKeyParameters(
derX.Value,
new ElGamalParameters(para.P, para.G));
}
else if (algOid.Equals(X9ObjectIdentifiers.IdDsa))
{
DerInteger derX = (DerInteger)keyInfo.ParsePrivateKey();
Asn1Encodable ae = algID.Parameters;
DsaParameters parameters = null;
if (ae != null)
{
DsaParameter para = DsaParameter.GetInstance(ae.ToAsn1Object());
parameters = new DsaParameters(para.P, para.Q, para.G);
}
return new DsaPrivateKeyParameters(derX.Value, parameters);
}
else if (algOid.Equals(X9ObjectIdentifiers.IdECPublicKey))
{
X962Parameters para = X962Parameters.GetInstance(algID.Parameters.ToAsn1Object());
X9ECParameters x9;
if (para.IsNamedCurve)
{
x9 = ECKeyPairGenerator.FindECCurveByOid((DerObjectIdentifier)para.Parameters);
}
else
{
x9 = new X9ECParameters((Asn1Sequence)para.Parameters);
}
ECPrivateKeyStructure ec = ECPrivateKeyStructure.GetInstance(keyInfo.ParsePrivateKey());
BigInteger d = ec.GetKey();
if (para.IsNamedCurve)
{
return new ECPrivateKeyParameters("EC", d, (DerObjectIdentifier)para.Parameters);
}
ECDomainParameters dParams = new ECDomainParameters(x9.Curve, x9.G, x9.N, x9.H, x9.GetSeed());
return new ECPrivateKeyParameters(d, dParams);
}
else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x2001) ||
algOid.Equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512) ||
algOid.Equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256))
{
Asn1Object p = algID.Parameters.ToAsn1Object();
Gost3410PublicKeyAlgParameters gostParams = Gost3410PublicKeyAlgParameters.GetInstance(p);
ECGost3410Parameters ecSpec;
BigInteger d;
if (p is Asn1Sequence seq && (seq.Count == 2 || seq.Count == 3))
{
X9ECParameters ecP = ECGost3410NamedCurves.GetByOid(gostParams.PublicKeyParamSet);
if (ecP == null)
throw new ArgumentException("Unrecognized curve OID for GostR3410x2001 private key");
ecSpec = new ECGost3410Parameters(
new ECNamedDomainParameters(gostParams.PublicKeyParamSet, ecP),
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
int privateKeyLength = keyInfo.PrivateKeyLength;
if (privateKeyLength == 32 || privateKeyLength == 64)
{
d = new BigInteger(1, keyInfo.PrivateKey.GetOctets(), bigEndian: false);
}
else
{
Asn1Object privKey = keyInfo.ParsePrivateKey();
if (privKey is DerInteger derInteger)
{
d = derInteger.PositiveValue;
}
else
{
byte[] dVal = Asn1OctetString.GetInstance(privKey).GetOctets();
d = new BigInteger(1, dVal, bigEndian: false);
}
}
}
else
{
X962Parameters x962Parameters = X962Parameters.GetInstance(p);
if (x962Parameters.IsNamedCurve)
{
DerObjectIdentifier oid = DerObjectIdentifier.GetInstance(x962Parameters.Parameters);
X9ECParameters ecP = ECNamedCurveTable.GetByOid(oid);
if (ecP == null)
throw new ArgumentException("Unrecognized curve OID for GostR3410x2001 private key");
ecSpec = new ECGost3410Parameters(
new ECNamedDomainParameters(oid, ecP),
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
}
else if (x962Parameters.IsImplicitlyCA)
{
ecSpec = null;
}
else
{
X9ECParameters ecP = X9ECParameters.GetInstance(x962Parameters.Parameters);
ecSpec = new ECGost3410Parameters(
new ECNamedDomainParameters(algOid, ecP),
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
}
Asn1Object privKey = keyInfo.ParsePrivateKey();
if (privKey is DerInteger derD)
{
d = derD.Value;
}
else
{
ECPrivateKeyStructure ec = ECPrivateKeyStructure.GetInstance(privKey);
d = ec.GetKey();
}
}
return new ECPrivateKeyParameters(
d,
new ECGost3410Parameters(
ecSpec,
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet));
}
else if (algOid.Equals(CryptoProObjectIdentifiers.GostR3410x94))
{
Gost3410PublicKeyAlgParameters gostParams = Gost3410PublicKeyAlgParameters.GetInstance(algID.Parameters);
Asn1Object privKey = keyInfo.ParsePrivateKey();
BigInteger x;
if (privKey is DerInteger)
{
x = DerInteger.GetInstance(privKey).PositiveValue;
}
else
{
x = new BigInteger(1, Asn1OctetString.GetInstance(privKey).GetOctets(), bigEndian: false);
}
return new Gost3410PrivateKeyParameters(x, gostParams.PublicKeyParamSet);
}
else if (algOid.Equals(EdECObjectIdentifiers.id_X25519)
|| algOid.Equals(CryptlibObjectIdentifiers.curvey25519))
{
// Java 11 bug: exact length of X25519/X448 secret used in Java 11
if (X25519PrivateKeyParameters.KeySize == keyInfo.PrivateKeyLength)
return new X25519PrivateKeyParameters(keyInfo.PrivateKey.GetOctets());
return new X25519PrivateKeyParameters(GetRawKey(keyInfo));
}
else if (algOid.Equals(EdECObjectIdentifiers.id_X448))
{
// Java 11 bug: exact length of X25519/X448 secret used in Java 11
if (X448PrivateKeyParameters.KeySize == keyInfo.PrivateKeyLength)
return new X448PrivateKeyParameters(keyInfo.PrivateKey.GetOctets());
return new X448PrivateKeyParameters(GetRawKey(keyInfo));
}
else if (algOid.Equals(EdECObjectIdentifiers.id_Ed25519)
|| algOid.Equals(GnuObjectIdentifiers.Ed25519))
{
return new Ed25519PrivateKeyParameters(GetRawKey(keyInfo));
}
else if (algOid.Equals(EdECObjectIdentifiers.id_Ed448))
{
return new Ed448PrivateKeyParameters(GetRawKey(keyInfo));
}
else if (algOid.Equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_256)
|| algOid.Equals(RosstandartObjectIdentifiers.id_tc26_gost_3410_12_512)
|| algOid.Equals(RosstandartObjectIdentifiers.id_tc26_agreement_gost_3410_12_256)
|| algOid.Equals(RosstandartObjectIdentifiers.id_tc26_agreement_gost_3410_12_512))
{
Gost3410PublicKeyAlgParameters gostParams = Gost3410PublicKeyAlgParameters.GetInstance(
keyInfo.PrivateKeyAlgorithm.Parameters);
ECGost3410Parameters ecSpec;
BigInteger d;
Asn1Object p = keyInfo.PrivateKeyAlgorithm.Parameters.ToAsn1Object();
if (p is Asn1Sequence && (Asn1Sequence.GetInstance(p).Count == 2 || Asn1Sequence.GetInstance(p).Count == 3))
{
X9ECParameters ecP = ECGost3410NamedCurves.GetByOid(gostParams.PublicKeyParamSet);
ecSpec = new ECGost3410Parameters(
new ECNamedDomainParameters(
gostParams.PublicKeyParamSet, ecP),
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
int privateKeyLength = keyInfo.PrivateKeyLength;
if (privateKeyLength == 32 || privateKeyLength == 64)
{
d = new BigInteger(1, keyInfo.PrivateKey.GetOctets(), bigEndian: false);
}
else
{
Asn1Encodable privKey = keyInfo.ParsePrivateKey();
if (privKey is DerInteger)
{
d = DerInteger.GetInstance(privKey).PositiveValue;
}
else
{
byte[] dVal = Asn1OctetString.GetInstance(privKey).GetOctets();
d = new BigInteger(1, dVal, bigEndian: false);
}
}
}
else
{
X962Parameters parameters = X962Parameters.GetInstance(keyInfo.PrivateKeyAlgorithm.Parameters);
if (parameters.IsNamedCurve)
{
DerObjectIdentifier oid = DerObjectIdentifier.GetInstance(parameters.Parameters);
X9ECParameters ecP = ECKeyPairGenerator.FindECCurveByOid(oid);
ecSpec = new ECGost3410Parameters(new ECNamedDomainParameters(oid, ecP),
gostParams.PublicKeyParamSet, gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
}
else if (parameters.IsImplicitlyCA)
{
ecSpec = null;
}
else
{
X9ECParameters ecP = X9ECParameters.GetInstance(parameters.Parameters);
ecSpec = new ECGost3410Parameters(new ECNamedDomainParameters(algOid, ecP),
gostParams.PublicKeyParamSet, gostParams.DigestParamSet,
gostParams.EncryptionParamSet);
}
Asn1Encodable privKey = keyInfo.ParsePrivateKey();
if (privKey is DerInteger)
{
DerInteger derD = DerInteger.GetInstance(privKey);
d = derD.Value;
}
else
{
ECPrivateKeyStructure ec = ECPrivateKeyStructure.GetInstance(privKey);
d = ec.GetKey();
}
}
return new ECPrivateKeyParameters(
d,
new ECGost3410Parameters(
ecSpec,
gostParams.PublicKeyParamSet,
gostParams.DigestParamSet,
gostParams.EncryptionParamSet));
}
else
{
throw new SecurityUtilityException("algorithm identifier in private key not recognised");
}
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
private static ReadOnlySpan<byte> GetRawKey(PrivateKeyInfo keyInfo)
{
return Asn1OctetString.GetInstance(keyInfo.ParsePrivateKey()).GetOctetsSpan();
}
#else
private static byte[] GetRawKey(PrivateKeyInfo keyInfo)
{
return Asn1OctetString.GetInstance(keyInfo.ParsePrivateKey()).GetOctets();
}
#endif
public static AsymmetricKeyParameter DecryptKey(
char[] passPhrase,
EncryptedPrivateKeyInfo encInfo)
{
return CreateKey(PrivateKeyInfoFactory.CreatePrivateKeyInfo(passPhrase, encInfo));
}
public static AsymmetricKeyParameter DecryptKey(
char[] passPhrase,
byte[] encryptedPrivateKeyInfoData)
{
return DecryptKey(passPhrase, Asn1Object.FromByteArray(encryptedPrivateKeyInfoData));
}
public static AsymmetricKeyParameter DecryptKey(
char[] passPhrase,
Stream encryptedPrivateKeyInfoStream)
{
return DecryptKey(passPhrase, Asn1Object.FromStream(encryptedPrivateKeyInfoStream));
}
private static AsymmetricKeyParameter DecryptKey(
char[] passPhrase,
Asn1Object asn1Object)
{
return DecryptKey(passPhrase, EncryptedPrivateKeyInfo.GetInstance(asn1Object));
}
public static byte[] EncryptKey(
DerObjectIdentifier algorithm,
char[] passPhrase,
byte[] salt,
int iterationCount,
AsymmetricKeyParameter key)
{
return EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo(
algorithm, passPhrase, salt, iterationCount, key).GetEncoded();
}
public static byte[] EncryptKey(
string algorithm,
char[] passPhrase,
byte[] salt,
int iterationCount,
AsymmetricKeyParameter key)
{
return EncryptedPrivateKeyInfoFactory.CreateEncryptedPrivateKeyInfo(
algorithm, passPhrase, salt, iterationCount, key).GetEncoded();
}
}
}
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