EncryptedPrivateKeyInfoFactory.cs :  » PDF » iTextSharp » Org » BouncyCastle » Pkcs » C# / CSharp Open Source

using System;

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;

namespace Org.BouncyCastle.Pkcs{
    public sealed class EncryptedPrivateKeyInfoFactory
    {
        private EncryptedPrivateKeyInfoFactory()
        {
        }

        public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
            DerObjectIdentifier    algorithm,
            char[]          passPhrase,
            byte[]          salt,
            int            iterationCount,
            AsymmetricKeyParameter  key)
        {
            return CreateEncryptedPrivateKeyInfo(
        algorithm.Id, passPhrase, salt, iterationCount,
        PrivateKeyInfoFactory.CreatePrivateKeyInfo(key));
        }

    public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
      string          algorithm,
      char[]          passPhrase,
      byte[]          salt,
      int            iterationCount,
      AsymmetricKeyParameter  key)
    {
      return CreateEncryptedPrivateKeyInfo(
        algorithm, passPhrase, salt, iterationCount,
        PrivateKeyInfoFactory.CreatePrivateKeyInfo(key));
    }

    public static EncryptedPrivateKeyInfo CreateEncryptedPrivateKeyInfo(
            string      algorithm,
            char[]      passPhrase,
            byte[]      salt,
            int        iterationCount,
            PrivateKeyInfo  keyInfo)
        {
            if (!PbeUtilities.IsPbeAlgorithm(algorithm))
                throw new ArgumentException("attempt to use non-PBE algorithm with PBE EncryptedPrivateKeyInfo generation");

      IBufferedCipher cipher = PbeUtilities.CreateEngine(algorithm) as IBufferedCipher;

      if (cipher == null)
      {
        // TODO Throw exception?
      }

      Asn1Encodable parameters = PbeUtilities.GenerateAlgorithmParameters(
        algorithm, salt, iterationCount);

      ICipherParameters keyParameters = PbeUtilities.GenerateCipherParameters(
        algorithm, passPhrase, parameters);

      cipher.Init(true, keyParameters);

      byte[] keyBytes = keyInfo.GetEncoded();
      byte[] encoding = cipher.DoFinal(keyBytes);

      DerObjectIdentifier oid = PbeUtilities.GetObjectIdentifier(algorithm);
      AlgorithmIdentifier algID = new AlgorithmIdentifier(oid, parameters);

      return new EncryptedPrivateKeyInfo(algID, encoding);
        }
    }
}