Introduction

This is an example of using Bouncy Castle's OpenPGP utility to encrypt and decrypt files.

This project is a refactory of the Bouncy Castle example which you can find here

Code snippet to encrypt a file without signing

    BCPGPEncryptor encryptor = new BCPGPEncryptor();
    encryptor.setArmored(false);
    encryptor.setCheckIntegrity(true);
    encryptor.setPublicKeyFilePath("./test.gpg.pub");
    encryptor.encryptFile("./test.txt", "./test.txt.enc");

Code snippet to decrypt a file without verifying signature;

    BCPGPDecryptor decryptor = new BCPGPDecryptor(); 
    decryptor.setPrivateKeyFilePath("test.gpg.prv");
    decryptor.setPassword("password");
    decryptor.decryptFile("test.txt.enc", "test.txt.dec");

Code snippet to encrypt and sign a file

    BCPGPEncryptor encryptor = new BCPGPEncryptor();
    encryptor.setArmored(false);
    encryptor.setCheckIntegrity(true);
    encryptor.setPublicKeyFilePath("./test.gpg.pub");
    encryptor.setSigning(true);
    encryptor.setSigningPrivateKeyFilePath("wahaha.gpg.prv");
    encryptor.setSigningPrivateKeyPassword("password");
    encryptor.encryptFile("./test.txt", "./test.txt.signed.enc");

Code snippet to decrypt a file and verify signature;

    BCPGPDecryptor decryptor = new BCPGPDecryptor(); 
    decryptor.setPrivateKeyFilePath("test.gpg.prv");
    decryptor.setPassword("password");
    decryptor.setSigned(true);
    decryptor.setSigningPublicKeyFilePath("wahaha.gpg.pub");

    // this file is encrypted with weili's public key and signed using wahaha's private key
    decryptor.decryptFile("test.txt.signed.enc", "test.txt.signed.dec");

Try it

This project contains a test pgp public and private key which are used for test purpose so that you can try it out right away. You can run the following mvn command from command line:

    >mvn exec:java -Dexec.mainClass=com.test.pgp.bc.BCPGPTest

Note

If you get error "java.security.InvalidKeyException: Illegal key size", you may need to install the unrestricted policy files for the JVM you are using. See details here