How to create a V3 signature msg using BouncyCastle OpenPGP

Question

Our Unix PGP v2.x created a signed and encrypted message with the following sequence of packets::
encrypted data packet:
length: 342
gpg: encrypted with 2048-bit RSA key, ID 630C97A1, created 2006-05-25"
rcashxsign <[email protected]>"
gpg: IDEA encrypted data
:compressed packet: algo=1, keyid BC19C7E5630C97A1
version 3, created 1168632782, md5len 5, sigclass 00
digest algo 1, begin of digest 4f 7e
data: [2047 bits]
:literal data packet:
mode b (62), created 0, name="testyong",
raw data: 29 bytes
gpg: WARNING: message was not integrity protected
Looking at the signature part, you see there is no one-pass signature packet, the signature is before the literal data.
The test method generateV3BinarySig() in \src\org\bouncycastle\openpgp\test\PGPSignatureTest.java obviously does a different job.
Does anyone know how to create such a PGP v2.x signature message?
We are close to product release. I greatly appreciate your help

Answer 1

It turns out I put the following literal packet generation code before the signature packet generation code:
//Then output the literature data
  PGPLiteralDataGenerator lGen = new PGPLiteralDataGenerator(true);
  OutputStream lOut = lGen.open(bcOut, PGPLiteralData.BINARY, file);   
  lOut.write(bOut.toByteArray());They should be put after the signature packet generation code because the lGen.open(...) actually writes out the literal data packet header.
Here is the sample code to make a PGP 2.x signature (or version 3 signature):
//Compress data
      PGPCompressedDataGenerator cGen = new PGPCompressedDataGenerator(CompressionAlgorithmTags.ZIP);
      BCPGOutputStream bcOut = new BCPGOutputStream(cGen.open(out));
      File file = new File(inFileName);
      FileInputStream fIn = new FileInputStream(file);
      int ch = 0;
      ByteArrayOutputStream bOut = new ByteArrayOutputStream();
      while ((ch = fIn.read()) >= 0) {
        bOut.write(ch);
        sGen.update((byte) ch);
      //First output the signature
      sGen.generate().encode(bcOut);
      //Then output the literature data
      PGPLiteralDataGenerator lGen = new PGPLiteralDataGenerator(true);
      OutputStream lOut = lGen.open(bcOut, PGPLiteralData.BINARY, file);
      lOut.write(bOut.toByteArray());
      lGen.close(); 
      cGen.close();