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using System;
using System.Collections.Generic;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.IO;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Cms
{
class CmsEnvelopedHelper
{
internal static readonly CmsEnvelopedHelper Instance = new CmsEnvelopedHelper();
private static readonly IDictionary<string, int> KeySizes = new Dictionary<string, int>();
private static readonly IDictionary<string, string> BaseCipherNames = new Dictionary<string, string>();
static CmsEnvelopedHelper()
{
KeySizes.Add(CmsEnvelopedGenerator.DesEde3Cbc, 192);
KeySizes.Add(CmsEnvelopedGenerator.Aes128Cbc, 128);
KeySizes.Add(CmsEnvelopedGenerator.Aes192Cbc, 192);
KeySizes.Add(CmsEnvelopedGenerator.Aes256Cbc, 256);
BaseCipherNames.Add(CmsEnvelopedGenerator.DesEde3Cbc, "DESEDE");
BaseCipherNames.Add(CmsEnvelopedGenerator.Aes128Cbc, "AES");
BaseCipherNames.Add(CmsEnvelopedGenerator.Aes192Cbc, "AES");
BaseCipherNames.Add(CmsEnvelopedGenerator.Aes256Cbc, "AES");
}
private string GetAsymmetricEncryptionAlgName(
string encryptionAlgOid)
{
if (Asn1.Pkcs.PkcsObjectIdentifiers.RsaEncryption.Id.Equals(encryptionAlgOid))
{
return "RSA/ECB/PKCS1Padding";
}
return encryptionAlgOid;
}
internal IBufferedCipher CreateAsymmetricCipher(
string encryptionOid)
{
string asymName = GetAsymmetricEncryptionAlgName(encryptionOid);
if (!asymName.Equals(encryptionOid))
{
try
{
return CipherUtilities.GetCipher(asymName);
}
catch (SecurityUtilityException)
{
// Ignore
}
}
return CipherUtilities.GetCipher(encryptionOid);
}
internal IWrapper CreateWrapper(
string encryptionOid)
{
try
{
return WrapperUtilities.GetWrapper(encryptionOid);
}
catch (SecurityUtilityException)
{
return WrapperUtilities.GetWrapper(GetAsymmetricEncryptionAlgName(encryptionOid));
}
}
internal string GetRfc3211WrapperName(string oid)
{
if (oid == null)
throw new ArgumentNullException(nameof(oid));
if (!BaseCipherNames.TryGetValue(oid, out var alg))
throw new ArgumentException("no name for " + oid, nameof(oid));
return alg + "RFC3211Wrap";
}
internal int GetKeySize(string oid)
{
if (oid == null)
throw new ArgumentNullException(nameof(oid));
if (!KeySizes.TryGetValue(oid, out var keySize))
throw new ArgumentException("no keysize for " + oid, "oid");
return keySize;
}
internal static RecipientInformationStore BuildRecipientInformationStore(
Asn1Set recipientInfos, CmsSecureReadable secureReadable)
{
var infos = new List<RecipientInformation>();
for (int i = 0; i != recipientInfos.Count; i++)
{
RecipientInfo info = RecipientInfo.GetInstance(recipientInfos[i]);
ReadRecipientInfo(infos, info, secureReadable);
}
return new RecipientInformationStore(infos);
}
private static void ReadRecipientInfo(IList<RecipientInformation> infos, RecipientInfo info,
CmsSecureReadable secureReadable)
{
Asn1Encodable recipInfo = info.Info;
if (recipInfo is KeyTransRecipientInfo keyTransRecipientInfo)
{
infos.Add(new KeyTransRecipientInformation(keyTransRecipientInfo, secureReadable));
}
else if (recipInfo is KekRecipientInfo kekRecipientInfo)
{
infos.Add(new KekRecipientInformation(kekRecipientInfo, secureReadable));
}
else if (recipInfo is KeyAgreeRecipientInfo keyAgreeRecipientInfo)
{
KeyAgreeRecipientInformation.ReadRecipientInfo(infos, keyAgreeRecipientInfo, secureReadable);
}
else if (recipInfo is PasswordRecipientInfo passwordRecipientInfo)
{
infos.Add(new PasswordRecipientInformation(passwordRecipientInfo, secureReadable));
}
}
internal class CmsAuthenticatedSecureReadable : CmsSecureReadable
{
private AlgorithmIdentifier algorithm;
private IMac mac;
private CmsReadable readable;
internal CmsAuthenticatedSecureReadable(AlgorithmIdentifier algorithm, CmsReadable readable)
{
this.algorithm = algorithm;
this.readable = readable;
}
public AlgorithmIdentifier Algorithm
{
get { return this.algorithm; }
}
public object CryptoObject
{
get { return this.mac; }
}
public CmsReadable GetReadable(KeyParameter sKey)
{
string macAlg = this.algorithm.Algorithm.Id;
// Asn1Object sParams = this.algorithm.Parameters.ToAsn1Object();
try
{
this.mac = MacUtilities.GetMac(macAlg);
// FIXME Support for MAC algorithm parameters similar to cipher parameters
// ASN1Object sParams = (ASN1Object)macAlg.getParameters();
//
// if (sParams != null && !(sParams instanceof ASN1Null))
// {
// AlgorithmParameters params = CMSEnvelopedHelper.INSTANCE.createAlgorithmParameters(macAlg.getObjectId().getId(), provider);
//
// params.init(sParams.getEncoded(), "ASN.1");
//
// mac.init(sKey, params.getParameterSpec(IvParameterSpec.class));
// }
// else
{
mac.Init(sKey);
}
// Asn1Object asn1Params = asn1Enc == null ? null : asn1Enc.ToAsn1Object();
//
// ICipherParameters cipherParameters = sKey;
//
// if (asn1Params != null && !(asn1Params is Asn1Null))
// {
// cipherParameters = ParameterUtilities.GetCipherParameters(
// macAlg.Algorithm, cipherParameters, asn1Params);
// }
// else
// {
// string alg = macAlg.Algorithm.Id;
// if (alg.Equals(CmsEnvelopedGenerator.DesEde3Cbc)
// || alg.Equals(CmsEnvelopedGenerator.IdeaCbc)
// || alg.Equals(CmsEnvelopedGenerator.Cast5Cbc))
// {
// cipherParameters = new ParametersWithIV(cipherParameters, new byte[8]);
// }
// }
//
// mac.Init(cipherParameters);
}
catch (SecurityUtilityException e)
{
throw new CmsException("couldn't create cipher.", e);
}
catch (InvalidKeyException e)
{
throw new CmsException("key invalid in message.", e);
}
catch (IOException e)
{
throw new CmsException("error decoding algorithm parameters.", e);
}
try
{
return new CmsProcessableInputStream(
new TeeInputStream(
readable.GetInputStream(),
new MacSink(this.mac)));
}
catch (IOException e)
{
throw new CmsException("error reading content.", e);
}
}
}
internal class CmsEnvelopedSecureReadable : CmsSecureReadable
{
private AlgorithmIdentifier algorithm;
private IBufferedCipher cipher;
private CmsReadable readable;
internal CmsEnvelopedSecureReadable(AlgorithmIdentifier algorithm, CmsReadable readable)
{
this.algorithm = algorithm;
this.readable = readable;
}
public AlgorithmIdentifier Algorithm
{
get { return this.algorithm; }
}
public object CryptoObject
{
get { return this.cipher; }
}
public CmsReadable GetReadable(KeyParameter sKey)
{
try
{
this.cipher = CipherUtilities.GetCipher(this.algorithm.Algorithm);
Asn1Encodable asn1Enc = this.algorithm.Parameters;
Asn1Object asn1Params = asn1Enc == null ? null : asn1Enc.ToAsn1Object();
ICipherParameters cipherParameters = sKey;
if (asn1Params != null && !(asn1Params is Asn1Null))
{
cipherParameters = ParameterUtilities.GetCipherParameters(
this.algorithm.Algorithm, cipherParameters, asn1Params);
}
else
{
string alg = this.algorithm.Algorithm.Id;
if (alg.Equals(CmsEnvelopedGenerator.DesEde3Cbc)
|| alg.Equals(CmsEnvelopedGenerator.IdeaCbc)
|| alg.Equals(CmsEnvelopedGenerator.Cast5Cbc))
{
cipherParameters = new ParametersWithIV(cipherParameters, new byte[8]);
}
}
cipher.Init(false, cipherParameters);
}
catch (SecurityUtilityException e)
{
throw new CmsException("couldn't create cipher.", e);
}
catch (InvalidKeyException e)
{
throw new CmsException("key invalid in message.", e);
}
catch (IOException e)
{
throw new CmsException("error decoding algorithm parameters.", e);
}
try
{
return new CmsProcessableInputStream(
new CipherStream(readable.GetInputStream(), cipher, null));
}
catch (IOException e)
{
throw new CmsException("error reading content.", e);
}
}
}
}
}
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