コード例 #1
0
 private static byte[] decrypt(byte[] decoded, String dekInfo, char[] passwd)
     throws IOException, GeneralSecurityException {
   if (passwd == null) {
     throw new IOException("Password is null, but a password is required");
   }
   StringTokenizer tknz = new StringTokenizer(dekInfo, ",");
   String algorithm = tknz.nextToken();
   byte[] iv = Hex.decode(tknz.nextToken());
   if (!CipherModule.isSupportedCipher(algorithm)) {
     throw new IOException("Unknown algorithm: " + algorithm);
   }
   String[] cipher = org.jruby.ext.openssl.Cipher.Algorithm.osslToJsse(algorithm);
   String realName = cipher[3];
   int[] lengths = org.jruby.ext.openssl.Cipher.Algorithm.osslKeyIvLength(algorithm);
   int keyLen = lengths[0];
   int ivLen = lengths[1];
   if (iv.length != ivLen) {
     throw new IOException("Illegal IV length");
   }
   byte[] salt = new byte[8];
   System.arraycopy(iv, 0, salt, 0, 8);
   OpenSSLPBEParametersGenerator pGen = new OpenSSLPBEParametersGenerator();
   pGen.init(PBEParametersGenerator.PKCS5PasswordToBytes(passwd), salt);
   KeyParameter param = (KeyParameter) pGen.generateDerivedParameters(keyLen * 8);
   SecretKey secretKey = new javax.crypto.spec.SecretKeySpec(param.getKey(), realName);
   Cipher c = Cipher.getInstance(realName);
   c.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iv));
   return c.doFinal(decoded);
 }
コード例 #2
0
 private static void writePemEncrypted(
     BufferedWriter out, String pemHeader, byte[] encoding, CipherSpec cipher, char[] passwd)
     throws IOException {
   Cipher c = cipher.getCipher();
   byte[] iv = new byte[c.getBlockSize()];
   random.nextBytes(iv);
   byte[] salt = new byte[8];
   System.arraycopy(iv, 0, salt, 0, 8);
   OpenSSLPBEParametersGenerator pGen = new OpenSSLPBEParametersGenerator();
   pGen.init(PBEParametersGenerator.PKCS5PasswordToBytes(passwd), salt);
   KeyParameter param = (KeyParameter) pGen.generateDerivedParameters(cipher.getKeyLenInBits());
   SecretKey secretKey =
       new SecretKeySpec(
           param.getKey(), org.jruby.ext.openssl.Cipher.Algorithm.getAlgorithmBase(c));
   byte[] encData = null;
   try {
     c.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(iv));
     encData = c.doFinal(encoding);
   } catch (GeneralSecurityException gse) {
     throw new IOException("exception using cipher: " + gse.toString());
   }
   out.write(BEF_G + pemHeader + AFT);
   out.newLine();
   out.write("Proc-Type: 4,ENCRYPTED");
   out.newLine();
   out.write("DEK-Info: " + cipher.getOsslName() + ",");
   writeHexEncoded(out, iv);
   out.newLine();
   out.newLine();
   writeEncoded(out, encData);
   out.write(BEF_E + pemHeader + AFT);
   out.flush();
 }