protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { CipherParameters param; this.pbeSpec = null; this.pbeAlgorithm = null; this.engineParams = null; // // basic key check // if (!(key instanceof SecretKey)) { throw new InvalidKeyException( "Key for algorithm " + key.getAlgorithm() + " not suitable for symmetric enryption."); } if (key instanceof BCPBEKey) { BCPBEKey k = (BCPBEKey) key; if (k.getOID() != null) { pbeAlgorithm = k.getOID().getId(); } else { pbeAlgorithm = k.getAlgorithm(); } if (k.getParam() != null) { param = k.getParam(); pbeSpec = new PBEParameterSpec(k.getSalt(), k.getIterationCount()); } else if (params instanceof PBEParameterSpec) { param = PBE.Util.makePBEParameters(k, params, cipher.getAlgorithmName()); pbeSpec = (PBEParameterSpec) params; } else { throw new InvalidAlgorithmParameterException("PBE requires PBE parameters to be set."); } if (k.getIvSize() != 0) { ivParam = (ParametersWithIV) param; } } else if (params == null) { param = new KeyParameter(key.getEncoded()); } else if (params instanceof IvParameterSpec) { param = new ParametersWithIV( new KeyParameter(key.getEncoded()), ((IvParameterSpec) params).getIV()); ivParam = (ParametersWithIV) param; } else { throw new IllegalArgumentException("unknown parameter type."); } if ((ivLength != 0) && !(param instanceof ParametersWithIV)) { SecureRandom ivRandom = random; if (ivRandom == null) { ivRandom = new SecureRandom(); } if ((opmode == Cipher.ENCRYPT_MODE) || (opmode == Cipher.WRAP_MODE)) { byte[] iv = new byte[ivLength]; ivRandom.nextBytes(iv); param = new ParametersWithIV(param, iv); ivParam = (ParametersWithIV) param; } else { throw new InvalidAlgorithmParameterException("no IV set when one expected"); } } switch (opmode) { case Cipher.ENCRYPT_MODE: case Cipher.WRAP_MODE: cipher.init(true, param); break; case Cipher.DECRYPT_MODE: case Cipher.UNWRAP_MODE: cipher.init(false, param); break; default: System.out.println("eeek!"); } }