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6.3

Decrypt pgp file using bouncycastle api

Asked by alexk23 in Java Programming Language

Tags: decrypt bouncycastle pgp

Hello, I am trying to decrypt PGP encrypted file. The file was encrypted using my public key that I generated. I could encrypt and decrypt the files that I created locally using bouncycastle API, but when my client encrypts the file on his side I am not able to decrypt it using bouncycastle API but could decrypt it manually using gnupg on command prompt.

When run decryption in my class I am not able to find secret key to decrypt the file. And I am not sure how my client decrypts it.

Please let me know if you have any suggestions.

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             import org.bouncycastle.openpgp.*;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
 
 
 
import java.io.*;
import java.util.Iterator;
import java.security.NoSuchProviderException;
import java.security.Security;
 
 
 
public class PGPSecurityService {
    public PGPSecurityService(){}
 
    public static  void main(String[] args){
        try{
            Security.addProvider(new BouncyCastleProvider());
            FileInputStream privKey = new FileInputStream("C:\\apps\\private\\secring.gpg");
            InputStream file = new BufferedInputStream (new FileInputStream("C:\\apps\\private\\encrypted.pgp"));
            System.out.println(decryptFile(file, privKey, "mykey".toCharArray()));
        } catch (Exception ex){
            ex.printStackTrace();
        }
    }
 
 
    private static String decryptFile(InputStream in, InputStream keyIn, char[] passwd) throws Exception {
        try {
            PGPObjectFactory pgpF = new PGPObjectFactory(PGPUtil.getDecoderStream(in));
            Object o = pgpF.nextObject();
            PGPEncryptedDataList enc = o instanceof  PGPEncryptedDataList ? (PGPEncryptedDataList) o :(PGPEncryptedDataList) pgpF.nextObject();
            Iterator it = enc.getEncryptedDataObjects();
            PGPPrivateKey sKey = null;
            PGPPublicKeyEncryptedData pbe = null;
 
            while (sKey == null && it.hasNext()) {
                pbe = (PGPPublicKeyEncryptedData) it.next();
                sKey =findSecretKey(keyIn, pbe.getKeyID(), passwd);
            }
            if (sKey == null) {
 
                throw new IllegalArgumentException("secret key for message not found.");
            }
 
            InputStream clear = pbe.getDataStream(sKey, "BC");
            PGPObjectFactory plainFact = new PGPObjectFactory(clear);
            Object message = plainFact.nextObject();
            if (message instanceof  PGPCompressedData) {
                PGPCompressedData cData = (PGPCompressedData) message;
                PGPObjectFactory pgpFact = new PGPObjectFactory(cData.getDataStream());
                message = pgpFact.nextObject();
            }
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            if (message instanceof PGPLiteralData) {
                PGPLiteralData ld = (PGPLiteralData) message;
                InputStream unc = ld.getInputStream();
                int ch;
                while ((ch = unc.read()) >= 0) {
                    baos.write(ch);
                }
            } else if (message instanceof  PGPOnePassSignatureList) {
                throw new PGPException("encrypted message contains a signed message - not literal data.");
            } else {
                throw new PGPException("message is not a simple encrypted file - type unknown.");
            }
 
            if (pbe.isIntegrityProtected()) {
               if (!pbe.verify()) {
                    System.err.println("message failed integrity check");
               }
            } else {
                System.err.println("no message integrity check");
            }
            return baos.toString();
        } catch (PGPException e) {
            e.printStackTrace();
        }
        return null;
    }
 
    private static PGPPrivateKey findSecretKey(InputStream keyIn, long keyID, char[] pass) throws IOException, PGPException, NoSuchProviderException {
        PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyIn));
        System.out.println("pgpSec size="+pgpSec);
        System.out.println(keyID);
        PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);
        return pgpSecKey != null? pgpSecKey.extractPrivateKey(pass, "BC"): null;
    }
    /*
    public static String decrypt(byte[] encdata, String keyLocation, String phrase) {
            try {
                ByteArrayInputStream bais = new ByteArrayInputStream(encdata);
                FileInputStream privKey = new FileInputStream(keyLocation);
                return decryptFile(bais, privKey, phrase.toCharArray());
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
        */
  
 
}

           
         

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Decrypt pgp file using bouncycastle api

Asked by alexk23 in Java Programming Language

Tags: decrypt bouncycastle pgp

About this solution