Java Code Examples for org.bouncycastle.openpgp.PGPSignatureList#get()

/**
 * Extracts a {@link PGPSignature} object from a blob of {@code .sig} data.
 *
 * @throws SignatureException if a signature object couldn't be extracted for any reason.
 */
private static PGPSignature pgpExtractSignature(@Tainted byte[] signature)
    throws SignatureException {
  try {
    ByteArrayInputStream input = new ByteArrayInputStream(signature);
    PGPObjectFactory decoder = new BcPGPObjectFactory(PGPUtil.getDecoderStream(input));
    Object object = decoder.nextObject();
    if (object == null) {
      throw new SignatureException(String.format(
          "No OpenPGP packets found in signature.\n%s",
          dumpHex(signature)));
    }
    if (!(object instanceof PGPSignatureList)) {
      throw new SignatureException(String.format(
          "Expected PGPSignatureList packet but got %s\n%s",
          object.getClass().getSimpleName(),
          dumpHex(signature)));
    }
    PGPSignatureList sigs = (PGPSignatureList) object;
    if (sigs.isEmpty()) {
      throw new SignatureException(String.format(
          "PGPSignatureList doesn't have a PGPSignature.\n%s",
          dumpHex(signature)));
    }
    return sigs.get(0);
  } catch (IOException e) {
    throw new SignatureException(String.format(
        "Failed to extract PGPSignature object from .sig blob.\n%s",
        dumpHex(signature)), e);
  }
}
 

@Test
public void testSignVerify_Detached() throws Exception {
  // Load the keys.
  PGPPublicKeyRing publicKeyRing = new BcPGPPublicKeyRing(PUBLIC_KEY);
  PGPSecretKeyRing privateKeyRing = new BcPGPSecretKeyRing(PRIVATE_KEY);
  PGPPublicKey publicKey = publicKeyRing.getPublicKey();
  PGPPrivateKey privateKey = extractPrivateKey(privateKeyRing.getSecretKey());

  // Sign the data and write signature data to "signatureFile".
  // Note: RSA_GENERAL will encrypt AND sign. RSA_SIGN and RSA_ENCRYPT are deprecated.
  PGPSignatureGenerator signer = new PGPSignatureGenerator(
      new BcPGPContentSignerBuilder(RSA_GENERAL, SHA256));
  signer.init(PGPSignature.BINARY_DOCUMENT, privateKey);
  addUserInfoToSignature(publicKey, signer);
  signer.update(FALL_OF_HYPERION_A_DREAM.getBytes(UTF_8));
  ByteArrayOutputStream output = new ByteArrayOutputStream();
  signer.generate().encode(output);
  byte[] signatureFileData = output.toByteArray();
  logger.atInfo().log(".sig file data: %s", dumpHex(signatureFileData));

  // Load algorithm information and signature data from "signatureFileData".
  PGPSignature sig;
  try (ByteArrayInputStream input = new ByteArrayInputStream(signatureFileData)) {
    PGPObjectFactory pgpFact = new BcPGPObjectFactory(input);
    PGPSignatureList sigList = (PGPSignatureList) pgpFact.nextObject();
    assertThat(sigList.size()).isEqualTo(1);
    sig = sigList.get(0);
  }

  // Use "onePass" and "sig" to verify "publicKey" signed the text.
  sig.init(new BcPGPContentVerifierBuilderProvider(), publicKey);
  sig.update(FALL_OF_HYPERION_A_DREAM.getBytes(UTF_8));
  assertThat(sig.verify()).isTrue();

  // Verify that they DIDN'T sign the text "hello monster".
  sig.init(new BcPGPContentVerifierBuilderProvider(), publicKey);
  sig.update("hello monster".getBytes(UTF_8));
  assertThat(sig.verify()).isFalse();
}
 

private static DecryptionResult verifySignature(DecryptionResult result,
        PGPObjectFactory pgpFact, PGPOnePassSignature ops) throws PGPException, IOException {
    Object object = pgpFact.nextObject(); // nullable
    if (!(object instanceof PGPSignatureList)) {
        LOGGER.warning("invalid signature packet");
        result.errors.add(Coder.Error.INVALID_SIGNATURE_DATA);
        return result;
    }

    PGPSignatureList signatureList = (PGPSignatureList) object;
    if (signatureList.isEmpty()) {
        LOGGER.warning("no signature in signature list");
        result.errors.add(Coder.Error.INVALID_SIGNATURE_DATA);
        return result;
    }

    PGPSignature signature = signatureList.get(0);
    // TODO signature.getCreationTime()
    if (ops.verify(signature)) {
        // signature verification successful!
        result.signing = Coder.Signing.VERIFIED;
    } else {
        LOGGER.warning("signature verification failed");
        result.errors.add(Coder.Error.INVALID_SIGNATURE);
    }
    return result;
}
 

public static boolean verifyClearSign( byte[] message, PGPPublicKeyRing pgpRings )
        throws IOException, PGPException, SignatureException
{
    ArmoredInputStream aIn = new ArmoredInputStream( new ByteArrayInputStream( message ) );
    ByteArrayOutputStream bout = new ByteArrayOutputStream();


    //
    // write out signed section using the local line separator.
    // note: trailing white space needs to be removed from the end of
    // each line RFC 4880 Section 7.1
    //
    ByteArrayOutputStream lineOut = new ByteArrayOutputStream();

    boolean isFirstLineClearText = aIn.isClearText();
    int lookAhead = readInputLine( lineOut, aIn );

    if ( lookAhead != -1 && isFirstLineClearText )
    {
        bout.write( lineOut.toByteArray() );
        while ( lookAhead != -1 && aIn.isClearText() )
        {
            lookAhead = readInputLine( lineOut, lookAhead, aIn );
            bout.write( lineOut.toByteArray() );
        }
    }

    JcaPGPObjectFactory pgpFact = new JcaPGPObjectFactory( aIn );
    PGPSignatureList p3 = ( PGPSignatureList ) pgpFact.nextObject();
    PGPSignature sig = p3.get( 0 );


    PGPPublicKey publicKey = pgpRings.getPublicKey( sig.getKeyID() );
    sig.init( new JcaPGPContentVerifierBuilderProvider().setProvider( "BC" ), publicKey );

    //
    // read the input, making sure we ignore the last newline.
    //

    InputStream sigIn = new ByteArrayInputStream( bout.toByteArray() );

    lookAhead = readInputLine( lineOut, sigIn );

    processLine( sig, lineOut.toByteArray() );

    if ( lookAhead != -1 )
    {
        do
        {
            lookAhead = readInputLine( lineOut, lookAhead, sigIn );

            sig.update( ( byte ) '\r' );
            sig.update( ( byte ) '\n' );

            processLine( sig, lineOut.toByteArray() );
        }
        while ( lookAhead != -1 );
    }

    sigIn.close();

    return sig.verify();
}
 

public boolean verifyInReleaseFilePgpSignature(final InputStream fileContent, final InputStream publicKeyString)
    throws Exception
{

  PGPPublicKeyRingCollection pgpRings =
      new PGPPublicKeyRingCollection(PGPUtil.getDecoderStream(publicKeyString),
          new JcaKeyFingerprintCalculator());
  ArmoredInputStream aIn = new ArmoredInputStream(fileContent);
  ByteArrayOutputStream releaseContent = new ByteArrayOutputStream();
  ByteArrayOutputStream lineOut = new ByteArrayOutputStream();

  int fromPositon = -1;
  if (aIn.isClearText()) {
    do {
      fromPositon = readStreamLine(lineOut, fromPositon, aIn);
      releaseContent.write(lineOut.toByteArray());
    }
    while (fromPositon != -1 && aIn.isClearText());
  }

  PGPObjectFactory pgpFact = new PGPObjectFactory(aIn, new JcaKeyFingerprintCalculator());
  PGPSignatureList p3 = (PGPSignatureList) pgpFact.nextObject();
  PGPSignature sig = p3.get(0);

  PGPPublicKey publicKey = pgpRings.getPublicKey(sig.getKeyID());
  sig.init(new JcaPGPContentVerifierBuilderProvider().setProvider("BC"), publicKey);
  InputStream sigIn = new ByteArrayInputStream(releaseContent.toByteArray());

  fromPositon = -1;
  do {
    int length;
    if (fromPositon != -1) {
      sig.update((byte) '\r');
      sig.update((byte) '\n');
    }
    fromPositon = readStreamLine(lineOut, fromPositon, sigIn);
    length = lineOut.toString(StandardCharsets.UTF_8.name()).replaceAll("\\s*$", "").length();
    if (length > 0) {
      sig.update(lineOut.toByteArray(), 0, length);
    }
  }
  while (fromPositon != -1);

  return sig.verify();
}
 

@Test
public void testSignVerify_OnePass() throws Exception {
  // Load the keys.
  PGPPublicKeyRing publicKeyRing = new BcPGPPublicKeyRing(PUBLIC_KEY);
  PGPSecretKeyRing privateKeyRing = new BcPGPSecretKeyRing(PRIVATE_KEY);
  PGPPublicKey publicKey = publicKeyRing.getPublicKey();
  PGPPrivateKey privateKey = extractPrivateKey(privateKeyRing.getSecretKey());

  // Sign the data and write signature data to "signatureFile".
  PGPSignatureGenerator signer = new PGPSignatureGenerator(
      new BcPGPContentSignerBuilder(RSA_GENERAL, SHA256));
  signer.init(PGPSignature.BINARY_DOCUMENT, privateKey);
  addUserInfoToSignature(publicKey, signer);
  ByteArrayOutputStream output = new ByteArrayOutputStream();
  signer.generateOnePassVersion(false).encode(output);
  signer.update(FALL_OF_HYPERION_A_DREAM.getBytes(UTF_8));
  signer.generate().encode(output);
  byte[] signatureFileData = output.toByteArray();
  logger.atInfo().log(".sig file data: %s", dumpHex(signatureFileData));

  // Load algorithm information and signature data from "signatureFileData".
  PGPSignature sig;
  PGPOnePassSignature onePass;
  try (ByteArrayInputStream input = new ByteArrayInputStream(signatureFileData)) {
    PGPObjectFactory pgpFact = new BcPGPObjectFactory(input);
    PGPOnePassSignatureList onePassList = (PGPOnePassSignatureList) pgpFact.nextObject();
    PGPSignatureList sigList = (PGPSignatureList) pgpFact.nextObject();
    assertThat(onePassList.size()).isEqualTo(1);
    assertThat(sigList.size()).isEqualTo(1);
    onePass = onePassList.get(0);
    sig = sigList.get(0);
  }

  // Use "onePass" and "sig" to verify "publicKey" signed the text.
  onePass.init(new BcPGPContentVerifierBuilderProvider(), publicKey);
  onePass.update(FALL_OF_HYPERION_A_DREAM.getBytes(UTF_8));
  assertThat(onePass.verify(sig)).isTrue();

  // Verify that they DIDN'T sign the text "hello monster".
  onePass.init(new BcPGPContentVerifierBuilderProvider(), publicKey);
  onePass.update("hello monster".getBytes(UTF_8));
  assertThat(onePass.verify(sig)).isFalse();
}