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using System;
using System.IO;
using Org.BouncyCastle.Bcpg.OpenPgp;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Bcpg.OpenPgp.Examples
{
/**
* A simple utility class that encrypts/decrypts password based
* encryption files.
* <p>
* To encrypt a file: PBEFileProcessor -e [-ai] fileName passPhrase.<br/>
* If -a is specified the output file will be "ascii-armored".<br/>
* If -i is specified the output file will be "integrity protected".</p>
* <p>
* To decrypt: PBEFileProcessor -d fileName passPhrase.</p>
* <p>
* Note: this example will silently overwrite files, nor does it pay any attention to
* the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
* will have been used.</p>
*/
public sealed class PbeFileProcessor
{
private PbeFileProcessor() {}
private static void DecryptFile(string inputFileName, char[] passPhrase)
{
using (Stream input = File.OpenRead(inputFileName))
{
DecryptFile(input, passPhrase);
}
}
/**
* decrypt the passed in message stream
*/
private static void DecryptFile(
Stream inputStream,
char[] passPhrase)
{
inputStream = PgpUtilities.GetDecoderStream(inputStream);
PgpObjectFactory pgpF = new PgpObjectFactory(inputStream);
PgpObject o = pgpF.NextPgpObject();
//
// the first object might be a PGP marker packet.
//
PgpEncryptedDataList enc = o as PgpEncryptedDataList;
if (enc == null)
{
enc = (PgpEncryptedDataList)pgpF.NextPgpObject();
}
PgpPbeEncryptedData pbe = (PgpPbeEncryptedData)enc[0];
Stream clear = pbe.GetDataStream(passPhrase);
PgpObjectFactory pgpFact = new PgpObjectFactory(clear);
//
// if we're trying to read a file generated by someone other than us
// the data might not be compressed, so we check the return type from
// the factory and behave accordingly.
//
o = pgpFact.NextPgpObject();
if (o is PgpCompressedData)
{
PgpCompressedData cData = (PgpCompressedData) o;
pgpFact = new PgpObjectFactory(cData.GetDataStream());
o = pgpFact.NextPgpObject();
}
PgpLiteralData ld = (PgpLiteralData) o;
Stream unc = ld.GetInputStream();
Stream fOut = File.Create(ld.FileName);
Streams.PipeAll(unc, fOut);
fOut.Close();
if (pbe.IsIntegrityProtected())
{
if (!pbe.Verify())
{
Console.Error.WriteLine("message failed integrity check");
}
else
{
Console.Error.WriteLine("message integrity check passed");
}
}
else
{
Console.Error.WriteLine("no message integrity check");
}
}
private static void EncryptFile(
string outputFileName,
string inputFileName,
char[] passPhrase,
bool armor,
bool withIntegrityCheck)
{
using (Stream output = File.Create(outputFileName))
{
EncryptFile(output, inputFileName, passPhrase, armor, withIntegrityCheck);
}
}
private static void EncryptFile(
Stream outputStream,
string fileName,
char[] passPhrase,
bool armor,
bool withIntegrityCheck)
{
if (armor)
{
outputStream = new ArmoredOutputStream(outputStream);
}
try
{
byte[] compressedData = PgpExampleUtilities.CompressFile(fileName, CompressionAlgorithmTag.Zip);
PgpEncryptedDataGenerator encGen = new PgpEncryptedDataGenerator(
SymmetricKeyAlgorithmTag.Cast5, withIntegrityCheck, new SecureRandom());
encGen.AddMethod(passPhrase, HashAlgorithmTag.Sha1);
Stream encOut = encGen.Open(outputStream, compressedData.Length);
encOut.Write(compressedData, 0, compressedData.Length);
encOut.Close();
if (armor)
{
outputStream.Close();
}
}
catch (PgpException e)
{
Console.Error.WriteLine(e);
Exception underlyingException = e.InnerException;
if (underlyingException != null)
{
Console.Error.WriteLine(underlyingException.Message);
Console.Error.WriteLine(underlyingException.StackTrace);
}
}
}
public static void Main(
string[] args)
{
if (args[0].Equals("-e"))
{
if (args[1].Equals("-a") || args[1].Equals("-ai") || args[1].Equals("-ia"))
{
EncryptFile(args[2] + ".asc", args[2], args[3].ToCharArray(), true, (args[1].IndexOf('i') > 0));
}
else if (args[1].Equals("-i"))
{
EncryptFile(args[2] + ".bpg", args[2], args[3].ToCharArray(), false, true);
}
else
{
EncryptFile(args[1] + ".bpg", args[1], args[2].ToCharArray(), false, false);
}
}
else if (args[0].Equals("-d"))
{
DecryptFile(args[1], args[2].ToCharArray());
}
else
{
Console.Error.WriteLine("usage: PbeFileProcessor -e [-ai]|-d file passPhrase");
}
}
}
}
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