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using System;
using System.IO;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Pkcs
{
/// <summary>
/// A holding class for a PKCS#8 encrypted private key info object that allows for its decryption.
/// </summary>
public class Pkcs8EncryptedPrivateKeyInfo
{
private EncryptedPrivateKeyInfo encryptedPrivateKeyInfo;
private static EncryptedPrivateKeyInfo parseBytes(byte[] pkcs8Encoding)
{
try
{
return EncryptedPrivateKeyInfo.GetInstance(pkcs8Encoding);
}
catch (ArgumentException e)
{
throw new PkcsIOException("malformed data: " + e.Message, e);
}
catch (Exception e)
{
throw new PkcsIOException("malformed data: " + e.Message, e);
}
}
/// <summary>
/// Base constructor from a PKCS#8 EncryptedPrivateKeyInfo object.
/// </summary>
/// <param name="encryptedPrivateKeyInfo">A PKCS#8 EncryptedPrivateKeyInfo object.</param>
public Pkcs8EncryptedPrivateKeyInfo(EncryptedPrivateKeyInfo encryptedPrivateKeyInfo)
{
this.encryptedPrivateKeyInfo = encryptedPrivateKeyInfo;
}
/// <summary>
/// Base constructor from a BER encoding of a PKCS#8 EncryptedPrivateKeyInfo object.
/// </summary>
/// <param name="encryptedPrivateKeyInfo">A BER encoding of a PKCS#8 EncryptedPrivateKeyInfo objects.</param>
public Pkcs8EncryptedPrivateKeyInfo(byte[] encryptedPrivateKeyInfo) : this(parseBytes(encryptedPrivateKeyInfo))
{
}
/// <summary>
/// Returns the underlying ASN.1 structure inside this object.
/// </summary>
/// <returns>Return the EncryptedPrivateKeyInfo structure in this object.</returns>
public EncryptedPrivateKeyInfo ToAsn1Structure()
{
return encryptedPrivateKeyInfo;
}
/// <summary>
/// Returns a copy of the encrypted data in this structure.
/// </summary>
/// <returns>Return a copy of the encrypted data in this object.</returns>
public byte[] GetEncryptedData()
{
return encryptedPrivateKeyInfo.GetEncryptedData();
}
/// <summary>
/// Return a binary ASN.1 encoding of the EncryptedPrivateKeyInfo structure in this object.
/// </summary>
/// <returns>A byte array containing the encoded object.</returns>
public byte[] GetEncoded()
{
return encryptedPrivateKeyInfo.GetEncoded();
}
/// <summary>
/// Get a decryptor from the passed in provider and decrypt the encrypted private key info, returning the result.
/// </summary>
/// <param name="inputDecryptorProvider">A provider to query for decryptors for the object.</param>
/// <returns>The decrypted private key info structure.</returns>
public PrivateKeyInfo DecryptPrivateKeyInfo(IDecryptorBuilderProvider inputDecryptorProvider)
{
try
{
ICipherBuilder decryptorBuilder = inputDecryptorProvider.CreateDecryptorBuilder(encryptedPrivateKeyInfo.EncryptionAlgorithm);
ICipher encIn = decryptorBuilder.BuildCipher(new MemoryInputStream(encryptedPrivateKeyInfo.GetEncryptedData()));
byte[] data;
using (var strm = encIn.Stream)
{
data = Streams.ReadAll(encIn.Stream);
}
return PrivateKeyInfo.GetInstance(data);
}
catch (Exception e)
{
throw new PkcsException("unable to read encrypted data: " + e.Message, e);
}
}
}
}
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