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using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Utilities;
using Org.BouncyCastle.Security;
namespace Org.BouncyCastle.Cms
{
internal class EnvelopedDataHelper
{
//private static readonly IDictionary<DerObjectIdentifier, string> BaseCipherNames =
// new Dictionary<DerObjectIdentifier, string>();
//private static readonly IDictionary<DerObjectIdentifier, string> MacAlgNames =
// new Dictionary<DerObjectIdentifier, string>();
//private static readonly IDictionary<DerObjectIdentifier, string> PrfDigests =
// new Dictionary<DerObjectIdentifier, string>();
//static EnvelopedDataHelper()
//{
// PrfDigests.Add(PkcsObjectIdentifiers.IdHmacWithSha1, "SHA-1");
// PrfDigests.Add(PkcsObjectIdentifiers.IdHmacWithSha224, "SHA-224");
// PrfDigests.Add(PkcsObjectIdentifiers.IdHmacWithSha256, "SHA-256");
// PrfDigests.Add(PkcsObjectIdentifiers.IdHmacWithSha384, "SHA-384");
// PrfDigests.Add(PkcsObjectIdentifiers.IdHmacWithSha512, "SHA-512");
// BaseCipherNames.Add(PkcsObjectIdentifiers.DesEde3Cbc, "DESEDE");
// BaseCipherNames.Add(NistObjectIdentifiers.IdAes128Cbc, "AES");
// BaseCipherNames.Add(NistObjectIdentifiers.IdAes192Cbc, "AES");
// BaseCipherNames.Add(NistObjectIdentifiers.IdAes256Cbc, "AES");
// MacAlgNames.Add(PkcsObjectIdentifiers.DesEde3Cbc, "DESEDEMac");
// MacAlgNames.Add(NistObjectIdentifiers.IdAes128Cbc, "AESMac");
// MacAlgNames.Add(NistObjectIdentifiers.IdAes192Cbc, "AESMac");
// MacAlgNames.Add(NistObjectIdentifiers.IdAes256Cbc, "AESMac");
// MacAlgNames.Add(PkcsObjectIdentifiers.RC2Cbc, "RC2Mac");
//}
//internal static IDigest GetPrf(AlgorithmIdentifier algID)
//{
// string digestName = (string)PrfDigests[algID];
// return DigestUtilities.GetDigest(digestName);
//}
//internal static IWrapper CreateRfc3211Wrapper(DerObjectIdentifier algorithm)
//{
// if (NistObjectIdentifiers.IdAes128Cbc.Equals(algorithm)
// || NistObjectIdentifiers.IdAes192Cbc.Equals(algorithm)
// || NistObjectIdentifiers.IdAes256Cbc.Equals(algorithm))
// {
// return new Rfc3211WrapEngine(AesUtilities.CreateEngine());
// }
// else if (PkcsObjectIdentifiers.DesEde3Cbc.Equals(algorithm))
// {
// return new Rfc3211WrapEngine(new DesEdeEngine());
// }
// else if (OiwObjectIdentifiers.DesCbc.Equals(algorithm))
// {
// return new Rfc3211WrapEngine(new DesEngine());
// }
// else if (PkcsObjectIdentifiers.RC2Cbc.Equals(algorithm))
// {
// return new Rfc3211WrapEngine(new RC2Engine());
// }
// else
// {
// throw new CmsException("cannot recognise wrapper: " + algorithm);
// }
//}
public static object CreateContentCipher(bool forEncryption, ICipherParameters encKey,
AlgorithmIdentifier encryptionAlgID)
{
return CipherFactory.CreateContentCipher(forEncryption, encKey, encryptionAlgID);
}
public AlgorithmIdentifier GenerateEncryptionAlgID(DerObjectIdentifier encryptionOID, KeyParameter encKey,
SecureRandom random)
{
return AlgorithmIdentifierFactory.GenerateEncryptionAlgID(encryptionOID, encKey.KeyLength * 8, random);
}
public CipherKeyGenerator CreateKeyGenerator(DerObjectIdentifier algorithm, SecureRandom random)
{
return CipherKeyGeneratorFactory.CreateKeyGenerator(algorithm, random);
}
}
}
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