几周以来，我一直在努力想弄清楚为什么我们的银行无法解密使用 BouncyCastle PGP 进行单遍签名和加密的消息。该银行正在使用 McAfee E-Business Server 8.6 进行解密。
数据使用银行的公钥加密，并使用我们的私钥签名。
使用我们自己的公钥进行加密，我成功地解密并验证了使用以下代码生成的文件的签名。Gnupg 可以很好地解密和验证文件。
但是，银行无法解密该文件。我试过先关闭压缩，然后关闭 ASCII 装甲。这两个选项似乎都不起作用，无论我尝试什么选项，它们总是会收到相同的错误消息：
event 1: initial
event 13: BeginLex
event 8: Analyze
File is encrypted. event 9: Recipients
Secret key is required to read it.
Key for user ID "XXXXXXXXX <XXXXXX@XXXX>"
event 6: Passphrase
event 23: Decryption
symmetric cipher used: CAST5
event 3: error -11391
event 2: final
Error decrypting file '/somepath/FILENAME'.
Corrupt data.
Bad packet
exitcode = 32
这是我用来执行单通签名和加密的代码：
public class PGPService {
private static final Logger log = Logger.getLogger(PGPService.class);
static {
Security.addProvider(new BouncyCastleProvider());
}
/**
* A simple routine that opens a key ring file and loads the first available key
* suitable for signature generation.
*
* @param input stream to read the secret key ring collection from.
* @return a secret key.
* @throws IOException on a problem with using the input stream.
* @throws PGPException if there is an issue parsing the input stream.
*/
@SuppressWarnings("rawtypes")
private static PGPSecretKey readSecretKey(InputStream input) throws IOException, PGPException {
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(
PGPUtil.getDecoderStream(input));
// We just loop through the collection till we find a key suitable for encryption, in the real
// world you would probably want to be a bit smarter about this.
Iterator keyRingIter = pgpSec.getKeyRings();
while (keyRingIter.hasNext()) {
PGPSecretKeyRing keyRing = (PGPSecretKeyRing)keyRingIter.next();
Iterator keyIter = keyRing.getSecretKeys();
while (keyIter.hasNext()) {
PGPSecretKey key = (PGPSecretKey)keyIter.next();
if (key.isSigningKey()) {
return key;
}
}
}
throw new IllegalArgumentException("Can't find signing key in key ring.");
}
/**
* Single pass signs and encrypts the given file to the given output file using the provided keys.
*
* @param fileNameIn - The name and location of the source input file.
* @param fileNameOut - The name and location of the destination output file.
* @param privateKeyIn - The input stream for the private key file.
* @param privateKeyPassword - The password for the private key file.
* @param publicEncryptionKey - The public encryption key.
* @param armoredOutput - Whether or not to ASCII armor the output.
*/
@SuppressWarnings("rawtypes")
public static void signAndEncrypt(String fileNameIn, String fileNameOut, InputStream privateKeyIn, String privateKeyPassword, PGPPublicKey publicEncryptionKey, boolean armoredOutput, boolean compress) {
int bufferSize = 1<<16;
InputStream input = null;
OutputStream finalOut = null;
OutputStream encOut = null;
OutputStream compressedOut = null;
OutputStream literalOut = null;
PGPEncryptedDataGenerator encryptedDataGenerator = null;
PGPCompressedDataGenerator compressedDataGenerator = null;
PGPSignatureGenerator signatureGenerator = null;
PGPLiteralDataGenerator literalDataGenerator = null;
try {
File output = new File(fileNameOut);
OutputStream out = new FileOutputStream(output);
if (armoredOutput) out = new ArmoredOutputStream(out);
// ? Use BCPGOutputStreams ?
// Init encrypted data generator
encryptedDataGenerator = new PGPEncryptedDataGenerator(PGPEncryptedDataGenerator.CAST5, true, new SecureRandom(), "BC");
encryptedDataGenerator.addMethod(publicEncryptionKey);
finalOut = new BufferedOutputStream(out, bufferSize);
encOut = encryptedDataGenerator.open(finalOut, new byte[bufferSize]);
// Init compression
if (compress) {
compressedDataGenerator = new PGPCompressedDataGenerator(PGPCompressedData.ZLIB);
compressedOut = new BufferedOutputStream(compressedDataGenerator.open(encOut));
}
// Init signature
PGPSecretKey pgpSec = readSecretKey(privateKeyIn);
PGPPrivateKey pgpPrivKey = pgpSec.extractPrivateKey(privateKeyPassword.toCharArray(), "BC");
signatureGenerator = new PGPSignatureGenerator(pgpSec.getPublicKey().getAlgorithm(), PGPUtil.SHA1, "BC");
signatureGenerator.initSign(PGPSignature.CANONICAL_TEXT_DOCUMENT, pgpPrivKey);
Iterator it = pgpSec.getPublicKey().getUserIDs();
if (it.hasNext()) {
PGPSignatureSubpacketGenerator spGen = new PGPSignatureSubpacketGenerator();
spGen.setSignerUserID(false, (String)it.next());
signatureGenerator.setHashedSubpackets(spGen.generate());
}
PGPOnePassSignature onePassSignature = signatureGenerator.generateOnePassVersion(false);
if (compress) onePassSignature.encode(compressedOut);
else onePassSignature.encode(encOut);
// Create the Literal Data generator Output stream which writes to the compression stream
literalDataGenerator = new PGPLiteralDataGenerator(true);
if (compress) literalOut = literalDataGenerator.open(compressedOut, PGPLiteralData.BINARY, output.getName(), new Date(), new byte[bufferSize]);
else literalOut = literalDataGenerator.open(encOut, PGPLiteralData.TEXT, fileNameIn, new Date(), new byte[bufferSize]);
// Update sign and encrypt
byte[] buffer = new byte[bufferSize];
int bytesRead = 0;
input = new FileInputStream(fileNameIn);
while((bytesRead = input.read(buffer)) != -1) {
literalOut.write(buffer,0,bytesRead);
signatureGenerator.update(buffer,0,bytesRead);
literalOut.flush();
}
// Close Literal data stream and add signature
literalOut.close();
literalDataGenerator.close();
if (compress) signatureGenerator.generate().encode(compressedOut);
else signatureGenerator.generate().encode(encOut);
} catch (Exception e) {
log.error(e);
throw new RuntimeException(e);
} finally {
// Close all streams
if (literalOut != null) try { literalOut.close(); } catch (IOException e) {}
if (literalDataGenerator != null) try { literalDataGenerator.close(); } catch (IOException e) {}
if (compressedOut != null) try { compressedOut.close(); } catch (IOException e) {}
if (compressedDataGenerator != null) try { compressedDataGenerator.close(); } catch (IOException e) {}
if (encOut != null) try { encOut.close(); } catch (IOException e) {}
if (encryptedDataGenerator != null) try { encryptedDataGenerator.close(); } catch (IOException e) {}
if (finalOut != null) try { finalOut.close(); } catch (IOException e) {}
if (input != null) try { input.close(); } catch (IOException e) {}
}
}
@SuppressWarnings("rawtypes")
private static PGPPublicKey readPublicKeyFromCol(InputStream in) throws Exception {
PGPPublicKeyRing pkRing = null;
PGPPublicKeyRingCollection pkCol = new PGPPublicKeyRingCollection(in);
log.info("Key ring size = " + pkCol.size());
Iterator it = pkCol.getKeyRings();
while (it.hasNext()) {
pkRing = (PGPPublicKeyRing) it.next();
Iterator pkIt = pkRing.getPublicKeys();
while (pkIt.hasNext()) {
PGPPublicKey key = (PGPPublicKey) pkIt.next();
log.info("Encryption key = " + key.isEncryptionKey() + ", Master key = " +
key.isMasterKey());
if (key.isEncryptionKey()) {
// Find out a little about the keys in the public key ring.
log.info("Key Strength = " + key.getBitStrength());
log.info("Algorithm = " + key.getAlgorithm());
log.info("Bit strength = " + key.getBitStrength());
log.info("Version = " + key.getVersion());
return key;
}
}
}
return null;
}
private static PGPPrivateKey findSecretKey(InputStream keyIn, long keyID, char[] pass)
throws IOException, PGPException, NoSuchProviderException {
PGPSecretKeyRingCollection pgpSec = new PGPSecretKeyRingCollection(PGPUtil.getDecoderStream(keyIn));
PGPSecretKey pgpSecKey = pgpSec.getSecretKey(keyID);
if (pgpSecKey == null) {
return null;
}
return pgpSecKey.extractPrivateKey(pass, "BC");
}
}
知道是什么原因造成的吗？我使用 Google 找到了许多报告，但没有解决方案或后续行动。