Example #1
0
  PGPDataDecryptor createDataDecryptor(boolean withIntegrityPacket, int encAlgorithm, byte[] key)
      throws PGPException {
    try {
      SecretKey secretKey = new SecretKeySpec(key, PGPUtil.getSymmetricCipherName(encAlgorithm));

      final Cipher c = createStreamCipher(encAlgorithm, withIntegrityPacket);

      if (withIntegrityPacket) {
        byte[] iv = new byte[c.getBlockSize()];

        c.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iv));
      } else {
        c.init(Cipher.DECRYPT_MODE, secretKey);
      }

      return new PGPDataDecryptor() {
        public InputStream getInputStream(InputStream in) {
          return new CipherInputStream(in, c);
        }

        public int getBlockSize() {
          return c.getBlockSize();
        }

        public PGPDigestCalculator getIntegrityCalculator() {
          return new SHA1PGPDigestCalculator();
        }
      };
    } catch (PGPException e) {
      throw e;
    } catch (Exception e) {
      throw new PGPException("Exception creating cipher", e);
    }
  }
Example #2
0
  Cipher createStreamCipher(int encAlgorithm, boolean withIntegrityPacket) throws PGPException {
    String mode = (withIntegrityPacket) ? "CFB" : "OpenPGPCFB";

    String cName = PGPUtil.getSymmetricCipherName(encAlgorithm) + "/" + mode + "/NoPadding";

    return createCipher(cName);
  }