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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Nist;
using Org.BouncyCastle.Asn1.Oiw;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
namespace Org.BouncyCastle.Crypto.Operators
{
public class Asn1KeyWrapper
: IKeyWrapper
{
private string algorithm;
private IKeyWrapper wrapper;
public Asn1KeyWrapper(string algorithm, X509Certificate cert)
{
this.algorithm = algorithm;
wrapper = KeyWrapperUtil.WrapperForName(algorithm, cert.GetPublicKey());
}
public Asn1KeyWrapper(DerObjectIdentifier algorithm, X509Certificate cert)
: this(algorithm, null, cert.GetPublicKey())
{
}
public Asn1KeyWrapper(DerObjectIdentifier algorithm, ICipherParameters key)
: this(algorithm, null, key)
{
}
public Asn1KeyWrapper(AlgorithmIdentifier algorithm, X509Certificate cert)
: this(algorithm.Algorithm, algorithm.Parameters, cert.GetPublicKey())
{
}
public Asn1KeyWrapper(DerObjectIdentifier algorithm, Asn1Encodable parameters, X509Certificate cert)
: this(algorithm, parameters, cert.GetPublicKey())
{
}
public Asn1KeyWrapper(AlgorithmIdentifier algorithm, ICipherParameters key)
: this(algorithm.Algorithm, algorithm.Parameters, key)
{
}
public Asn1KeyWrapper(DerObjectIdentifier algorithm, Asn1Encodable parameters, ICipherParameters key)
{
this.algorithm = algorithm.Id;
if (algorithm.Equals(PkcsObjectIdentifiers.IdRsaesOaep))
{
RsaesOaepParameters oaepParams = RsaesOaepParameters.GetInstance(parameters);
WrapperProvider provider;
if (oaepParams.MaskGenAlgorithm.Algorithm.Equals(PkcsObjectIdentifiers.IdMgf1))
{
AlgorithmIdentifier digAlg = AlgorithmIdentifier.GetInstance(oaepParams.MaskGenAlgorithm.Parameters);
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, digAlg.Algorithm);
}
else
{
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, oaepParams.MaskGenAlgorithm.Algorithm);
}
wrapper = (IKeyWrapper)provider.CreateWrapper(true, key);
}
else if (algorithm.Equals(PkcsObjectIdentifiers.RsaEncryption))
{
wrapper = (IKeyWrapper)new RsaPkcs1Wrapper(true, key);
}
else
{
throw new ArgumentException("unknown algorithm: " + algorithm.Id);
}
}
public object AlgorithmDetails
{
get { return wrapper.AlgorithmDetails; }
}
public IBlockResult Wrap(byte[] keyData)
{
return wrapper.Wrap(keyData);
}
}
public class Asn1KeyUnwrapper
: IKeyUnwrapper
{
private string algorithm;
private IKeyUnwrapper wrapper;
public Asn1KeyUnwrapper(string algorithm, ICipherParameters key)
{
this.algorithm = algorithm;
wrapper = KeyWrapperUtil.UnwrapperForName(algorithm, key);
}
public Asn1KeyUnwrapper(DerObjectIdentifier algorithm, ICipherParameters key)
: this(algorithm, null, key)
{
}
public Asn1KeyUnwrapper(DerObjectIdentifier algorithm, Asn1Encodable parameters, ICipherParameters key)
{
this.algorithm = algorithm.Id;
if (algorithm.Equals(PkcsObjectIdentifiers.IdRsaesOaep))
{
RsaesOaepParameters oaepParams = RsaesOaepParameters.GetInstance(parameters);
WrapperProvider provider;
if (oaepParams.MaskGenAlgorithm.Algorithm.Equals(PkcsObjectIdentifiers.IdMgf1))
{
AlgorithmIdentifier digAlg = AlgorithmIdentifier.GetInstance(oaepParams.MaskGenAlgorithm.Parameters);
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, digAlg.Algorithm);
}
else
{
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, oaepParams.MaskGenAlgorithm.Algorithm);
}
wrapper = (IKeyUnwrapper)provider.CreateWrapper(false, key);
}
else if (algorithm.Equals(PkcsObjectIdentifiers.RsaEncryption))
{
RsaesOaepParameters oaepParams = RsaesOaepParameters.GetInstance(parameters);
WrapperProvider provider;
if (oaepParams.MaskGenAlgorithm.Algorithm.Equals(PkcsObjectIdentifiers.IdMgf1))
{
AlgorithmIdentifier digAlg = AlgorithmIdentifier.GetInstance(oaepParams.MaskGenAlgorithm.Parameters);
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, digAlg.Algorithm);
}
else
{
provider = new RsaOaepWrapperProvider(oaepParams.HashAlgorithm.Algorithm, oaepParams.MaskGenAlgorithm.Algorithm);
}
wrapper = (IKeyUnwrapper)new RsaPkcs1Wrapper(false, key);
}
else
{
throw new ArgumentException("unknown algorithm: " + algorithm.Id);
}
}
public object AlgorithmDetails
{
get { return wrapper.AlgorithmDetails; }
}
public IBlockResult Unwrap(byte[] keyData, int offSet, int length)
{
return wrapper.Unwrap(keyData, offSet, length);
}
}
internal class KeyWrapperUtil
{
//
// Provider
//
private static readonly Dictionary<string, WrapperProvider> m_providerMap =
new Dictionary<string, WrapperProvider>(StringComparer.OrdinalIgnoreCase);
static KeyWrapperUtil()
{
m_providerMap.Add("RSA/ECB/PKCS1PADDING", new RsaOaepWrapperProvider(OiwObjectIdentifiers.IdSha1));
m_providerMap.Add("RSA/NONE/PKCS1PADDING", new RsaOaepWrapperProvider(OiwObjectIdentifiers.IdSha1));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA1ANDMGF1PADDING", new RsaOaepWrapperProvider(OiwObjectIdentifiers.IdSha1));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA224ANDMGF1PADDING", new RsaOaepWrapperProvider(NistObjectIdentifiers.IdSha224));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA256ANDMGF1PADDING", new RsaOaepWrapperProvider(NistObjectIdentifiers.IdSha256));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA384ANDMGF1PADDING", new RsaOaepWrapperProvider(NistObjectIdentifiers.IdSha384));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA512ANDMGF1PADDING", new RsaOaepWrapperProvider(NistObjectIdentifiers.IdSha512));
m_providerMap.Add("RSA/NONE/OAEPWITHSHA256ANDMGF1WITHSHA1PADDING", new RsaOaepWrapperProvider(NistObjectIdentifiers.IdSha256, OiwObjectIdentifiers.IdSha1));
}
public static IKeyWrapper WrapperForName(string algorithm, ICipherParameters parameters)
{
if (!m_providerMap.TryGetValue(algorithm, out var provider))
throw new ArgumentException("could not resolve " + algorithm + " to a KeyWrapper");
return (IKeyWrapper)provider.CreateWrapper(true, parameters);
}
public static IKeyUnwrapper UnwrapperForName(string algorithm, ICipherParameters parameters)
{
if (!m_providerMap.TryGetValue(algorithm, out var provider))
throw new ArgumentException("could not resolve " + algorithm + " to a KeyUnwrapper");
return (IKeyUnwrapper)provider.CreateWrapper(false, parameters);
}
}
internal interface WrapperProvider
{
object CreateWrapper(bool forWrapping, ICipherParameters parameters);
}
internal class RsaPkcs1Wrapper : IKeyWrapper, IKeyUnwrapper
{
private readonly AlgorithmIdentifier algId;
private readonly IAsymmetricBlockCipher engine;
public RsaPkcs1Wrapper(bool forWrapping, ICipherParameters parameters)
{
this.algId = new AlgorithmIdentifier(
PkcsObjectIdentifiers.RsaEncryption,
DerNull.Instance);
this.engine = new Pkcs1Encoding(new RsaBlindedEngine());
this.engine.Init(forWrapping, parameters);
}
public object AlgorithmDetails
{
get { return algId; }
}
public IBlockResult Unwrap(byte[] cipherText, int offset, int length)
{
return new SimpleBlockResult(engine.ProcessBlock(cipherText, offset, length));
}
public IBlockResult Wrap(byte[] keyData)
{
return new SimpleBlockResult(engine.ProcessBlock(keyData, 0, keyData.Length));
}
}
internal class RsaPkcs1WrapperProvider
: WrapperProvider
{
internal RsaPkcs1WrapperProvider()
{
}
object WrapperProvider.CreateWrapper(bool forWrapping, ICipherParameters parameters)
{
return new RsaPkcs1Wrapper(forWrapping, parameters);
}
}
internal class RsaOaepWrapper : IKeyWrapper, IKeyUnwrapper
{
private readonly AlgorithmIdentifier algId;
private readonly IAsymmetricBlockCipher engine;
public RsaOaepWrapper(bool forWrapping, ICipherParameters parameters, DerObjectIdentifier digestOid)
: this(forWrapping, parameters, digestOid, digestOid)
{
}
public RsaOaepWrapper(bool forWrapping, ICipherParameters parameters, DerObjectIdentifier digestOid, DerObjectIdentifier mgfOid)
{
AlgorithmIdentifier digestAlgId = new AlgorithmIdentifier(digestOid, DerNull.Instance);
if (mgfOid.Equals(NistObjectIdentifiers.IdShake128) || mgfOid.Equals(NistObjectIdentifiers.IdShake256))
{
this.algId = new AlgorithmIdentifier(
PkcsObjectIdentifiers.IdRsaesOaep,
new RsaesOaepParameters(
digestAlgId,
new AlgorithmIdentifier(mgfOid),
RsaesOaepParameters.DefaultPSourceAlgorithm));
}
else
{
this.algId = new AlgorithmIdentifier(
PkcsObjectIdentifiers.IdRsaesOaep,
new RsaesOaepParameters(
digestAlgId,
new AlgorithmIdentifier(PkcsObjectIdentifiers.IdMgf1, new AlgorithmIdentifier(mgfOid, DerNull.Instance)),
RsaesOaepParameters.DefaultPSourceAlgorithm));
}
this.engine = new OaepEncoding(new RsaBlindedEngine(), DigestUtilities.GetDigest(digestOid), DigestUtilities.GetDigest(mgfOid), null);
this.engine.Init(forWrapping, parameters);
}
public object AlgorithmDetails
{
get { return algId; }
}
public IBlockResult Unwrap(byte[] cipherText, int offset, int length)
{
return new SimpleBlockResult(engine.ProcessBlock(cipherText, offset, length));
}
public IBlockResult Wrap(byte[] keyData)
{
return new SimpleBlockResult(engine.ProcessBlock(keyData, 0, keyData.Length));
}
}
internal class RsaOaepWrapperProvider
: WrapperProvider
{
private readonly DerObjectIdentifier digestOid;
private readonly DerObjectIdentifier mgfOid;
internal RsaOaepWrapperProvider(DerObjectIdentifier digestOid)
{
this.digestOid = digestOid;
this.mgfOid = digestOid;
}
internal RsaOaepWrapperProvider(DerObjectIdentifier digestOid, DerObjectIdentifier mgfOid)
{
this.digestOid = digestOid;
this.mgfOid = mgfOid;
}
object WrapperProvider.CreateWrapper(bool forWrapping, ICipherParameters parameters)
{
return new RsaOaepWrapper(forWrapping, parameters, digestOid, mgfOid);
}
}
}
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