使用 PGP Public 密钥块实例 PGPPublicKey

Question

我得到了一个 PGP Public 密钥块，我应该用它来加密 csv 文件。使用 BouncyCastle 库，这是我正在使用的方法：

public static void encryptFile(
        OutputStream out,
        String fileName,
        PGPPublicKey encKey,
        boolean armor,
        boolean withIntegrityCheck)
        throws IOException, NoSuchProviderException, PGPException {
    Security.addProvider(new BouncyCastleProvider());

    if (armor) {
        out = new ArmoredOutputStream(out);
    }

    ByteArrayOutputStream bOut = new ByteArrayOutputStream();
    PGPCompressedDataGenerator comData = new PGPCompressedDataGenerator(PGPCompressedData.ZIP);

    PGPUtil.writeFileToLiteralData(
            comData.open(bOut),
            PGPLiteralData.BINARY,
            new File(fileName));

    comData.close();

    BcPGPDataEncryptorBuilder dataEncryptor = new BcPGPDataEncryptorBuilder(PGPEncryptedData.TRIPLE_DES);
    dataEncryptor.setWithIntegrityPacket(withIntegrityCheck);
    dataEncryptor.setSecureRandom(new SecureRandom());

    PGPEncryptedDataGenerator encryptedDataGenerator = new PGPEncryptedDataGenerator(dataEncryptor);
    encryptedDataGenerator.addMethod(new BcPublicKeyKeyEncryptionMethodGenerator(encKey));

    byte[] bytes = bOut.toByteArray();
    OutputStream cOut = encryptedDataGenerator.open(out, bytes.length);
    cOut.write(bytes);
    cOut.close();
    out.close();
}

当涉及到 PGPPublicKey 时，我不太确定如何为该方法提供参数。如何仅在给定 Key 块的情况下实例化该对象？

Answer 1

将您的密钥文件（假设您将密钥作为文件）传递给此方法，它将 return PGPPublicKey

  /** The fingerprint calculator to use whenever it is needed. */ 
  static final KeyFingerPrintCalculator FP_CALC = new BcKeyFingerprintCalculator(); 

  // Private class method readPublicKeyFromCol
  private static PGPPublicKey readPublicKeyFromCol(InputStream in)
                 throws Exception {
          PGPPublicKeyRing pkRing = null;
          PGPPublicKeyRingCollection pkCol = new PGPPublicKeyRingCollection(in, FP_CALC);
          System.out.println("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();
                          System.out.println("Encryption key = " + key.isEncryptionKey() + ", Master key = " + 
                                             key.isMasterKey());
                          if (key.isEncryptionKey())
                                  return key;
                  }
          }
          return null;
  }

!!!代码复制自sample code

使用 PGP Public 密钥块实例 PGPPublicKey

Instance PGPPublicKey using a PGP Public Key Block

java

encryption

bouncycastle

pgp