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using System;
using System.Collections;
using System.IO;
using System.Text;
using Org.BouncyCastle.Bcpg.OpenPgp;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.Encoders;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Bcpg.OpenPgp.Examples
{
/**
* Simple routine to encrypt and decrypt using a passphrase.
* This service routine provides the basic PGP services between
* byte arrays.
*
* Note: this code plays no attention to -Console in the file name
* the specification of "_CONSOLE" in the filename.
* It also expects that a single pass phrase will have been used.
*
*/
public sealed class ByteArrayHandler
{
private ByteArrayHandler()
{
}
/**
* decrypt the passed in message stream
*
* @param encrypted The message to be decrypted.
* @param passPhrase Pass phrase (key)
*
* @return Clear text as a byte array. I18N considerations are
* not handled by this routine
* @exception IOException
* @exception PgpException
*/
public static byte[] Decrypt(
byte[] encrypted,
char[] passPhrase)
{
Stream inputStream = new MemoryStream(encrypted);
inputStream = PgpUtilities.GetDecoderStream(inputStream);
PgpObjectFactory pgpF = new PgpObjectFactory(inputStream);
PgpEncryptedDataList enc = null;
PgpObject o = pgpF.NextPgpObject();
//
// the first object might be a PGP marker packet.
//
if (o is PgpEncryptedDataList)
{
enc = (PgpEncryptedDataList) o;
}
else
{
enc = (PgpEncryptedDataList) pgpF.NextPgpObject();
}
PgpPbeEncryptedData pbe = (PgpPbeEncryptedData)enc[0];
Stream clear = pbe.GetDataStream(passPhrase);
PgpObjectFactory pgpFact = new PgpObjectFactory(clear);
PgpCompressedData cData = (PgpCompressedData) pgpFact.NextPgpObject();
pgpFact = new PgpObjectFactory(cData.GetDataStream());
PgpLiteralData ld = (PgpLiteralData) pgpFact.NextPgpObject();
Stream unc = ld.GetInputStream();
return Streams.ReadAll(unc);
}
/**
* Simple PGP encryptor between byte[].
*
* @param clearData The test to be encrypted
* @param passPhrase The pass phrase (key). This method assumes that the
* key is a simple pass phrase, and does not yet support
* RSA or more sophisiticated keying.
* @param fileName File name. This is used in the Literal Data Packet (tag 11)
* which is really inly important if the data is to be
* related to a file to be recovered later. Because this
* routine does not know the source of the information, the
* caller can set something here for file name use that
* will be carried. If this routine is being used to
* encrypt SOAP MIME bodies, for example, use the file name from the
* MIME type, if applicable. Or anything else appropriate.
*
* @param armor
*
* @return encrypted data.
* @exception IOException
* @exception PgpException
*/
public static byte[] Encrypt(
byte[] clearData,
char[] passPhrase,
string fileName,
SymmetricKeyAlgorithmTag algorithm,
bool armor)
{
if (fileName == null)
{
fileName = PgpLiteralData.Console;
}
byte[] compressedData = Compress(clearData, fileName, CompressionAlgorithmTag.Zip);
MemoryStream bOut = new MemoryStream();
Stream output = bOut;
if (armor)
{
output = new ArmoredOutputStream(output);
}
PgpEncryptedDataGenerator encGen = new PgpEncryptedDataGenerator(algorithm, new SecureRandom());
encGen.AddMethod(passPhrase, HashAlgorithmTag.Sha1);
Stream encOut = encGen.Open(output, compressedData.Length);
encOut.Write(compressedData, 0, compressedData.Length);
encOut.Close();
if (armor)
{
output.Close();
}
return bOut.ToArray();
}
private static byte[] Compress(byte[] clearData, string fileName, CompressionAlgorithmTag algorithm)
{
MemoryStream bOut = new MemoryStream();
PgpCompressedDataGenerator comData = new PgpCompressedDataGenerator(algorithm);
Stream cos = comData.Open(bOut); // open it with the final destination
PgpLiteralDataGenerator lData = new PgpLiteralDataGenerator();
// we want to Generate compressed data. This might be a user option later,
// in which case we would pass in bOut.
Stream pOut = lData.Open(
cos, // the compressed output stream
PgpLiteralData.Binary,
fileName, // "filename" to store
clearData.Length, // length of clear data
DateTime.UtcNow // current time
);
pOut.Write(clearData, 0, clearData.Length);
pOut.Close();
comData.Close();
return bOut.ToArray();
}
private static string GetAsciiString(byte[] bs)
{
return Encoding.ASCII.GetString(bs, 0, bs.Length);
}
public static void Main(
string[] args)
{
string passPhrase = "Dick Beck";
char[] passArray = passPhrase.ToCharArray();
byte[] original = Encoding.ASCII.GetBytes("Hello world");
Console.WriteLine("Starting PGP test");
byte[] encrypted = Encrypt(original, passArray, "iway", SymmetricKeyAlgorithmTag.Cast5, true);
Console.WriteLine("\nencrypted data = '"+Hex.ToHexString(encrypted)+"'");
byte[] decrypted= Decrypt(encrypted,passArray);
Console.WriteLine("\ndecrypted data = '"+GetAsciiString(decrypted)+"'");
encrypted = Encrypt(original, passArray, "iway", SymmetricKeyAlgorithmTag.Aes256, false);
Console.WriteLine("\nencrypted data = '"+Hex.ToHexString(encrypted)+"'");
decrypted= Decrypt(encrypted, passArray);
Console.WriteLine("\ndecrypted data = '"+GetAsciiString(decrypted)+"'");
}
}
}
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