/** * Creates a new instance with the given parameters. * * @param params PBES2 parameters describing the key derivation function and encryption scheme. * @param password Password used to derive key. */ public PBES2EncryptionScheme(final PBES2Parameters params, final char[] password) { final PBKDF2Params kdfParams = PBKDF2Params.getInstance(params.getKeyDerivationFunc().getParameters()); final byte[] salt = kdfParams.getSalt(); final int iterations = kdfParams.getIterationCount().intValue(); if (kdfParams.getKeyLength() != null) { keyLength = kdfParams.getKeyLength().intValue() * 8; } final PKCS5S2ParametersGenerator generator = new PKCS5S2ParametersGenerator(); generator.init(PBEParametersGenerator.PKCS5PasswordToUTF8Bytes(password), salt, iterations); initCipher(generator, params.getEncryptionScheme()); }
byte[] keyBytes = generateKey(pbes2Parameters.getKeyDerivationFunc(), purpose, ((password != null) ? password : new char[0]), 32);
private static byte[] decrypt(EncryptedValue ev, char[] password) throws XiSecurityException { AlgorithmIdentifier symmAlg = ev.getSymmAlg(); if (!PKCSObjectIdentifiers.id_PBES2.equals(symmAlg.getAlgorithm())) { throw new XiSecurityException("unsupported symmAlg " + symmAlg.getAlgorithm().getId()); } PBES2Parameters alg = PBES2Parameters.getInstance(symmAlg.getParameters()); PBKDF2Params func = PBKDF2Params.getInstance(alg.getKeyDerivationFunc().getParameters()); AlgorithmIdentifier encScheme = AlgorithmIdentifier.getInstance(alg.getEncryptionScheme()); try { SecretKeyFactory keyFact = SecretKeyFactory.getInstance(alg.getKeyDerivationFunc().getAlgorithm().getId()); SecretKey key; int iterations = func.getIterationCount().intValue(); key = keyFact.generateSecret(new PBKDF2KeySpec(password, func.getSalt(), iterations, KEYSIZE_PROVIDER.getKeySize(encScheme), func.getPrf())); key = new SecretKeySpec(key.getEncoded(), "AES"); String cipherAlgOid = alg.getEncryptionScheme().getAlgorithm().getId(); Cipher cipher = Cipher.getInstance(cipherAlgOid); ASN1Encodable encParams = alg.getEncryptionScheme().getParameters(); GCMParameters gcmParameters = GCMParameters.getInstance(encParams); GCMParameterSpec gcmParamSpec = new GCMParameterSpec(gcmParameters.getIcvLen() * 8, gcmParameters.getNonce()); cipher.init(Cipher.DECRYPT_MODE, key, gcmParamSpec); return cipher.doFinal(ev.getEncValue().getOctets()); } catch (IllegalBlockSizeException | BadPaddingException | NoSuchAlgorithmException | InvalidKeySpecException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException ex) { throw new XiSecurityException("Error while decrypting the EncryptedValue", ex); } }
PBKDF2Params func = PBKDF2Params.getInstance(alg.getKeyDerivationFunc().getParameters()); AlgorithmIdentifier encScheme = AlgorithmIdentifier.getInstance(alg.getEncryptionScheme()); SecretKeyFactory.getInstance(alg.getKeyDerivationFunc().getAlgorithm().getId()); SecretKey key;
private Cipher createCipher(int mode, char[] password, AlgorithmIdentifier algId) throws NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, NoSuchProviderException { PBES2Parameters alg = PBES2Parameters.getInstance(algId.getParameters()); PBKDF2Params func = PBKDF2Params.getInstance(alg.getKeyDerivationFunc().getParameters()); AlgorithmIdentifier encScheme = AlgorithmIdentifier.getInstance(alg.getEncryptionScheme()); SecretKeyFactory keyFact = helper.createSecretKeyFactory(alg.getKeyDerivationFunc().getAlgorithm().getId()); SecretKey key; if (func.isDefaultPrf()) { key = keyFact.generateSecret(new PBEKeySpec(password, func.getSalt(), validateIterationCount(func.getIterationCount()), keySizeProvider.getKeySize(encScheme))); } else { key = keyFact.generateSecret(new PBKDF2KeySpec(password, func.getSalt(), validateIterationCount(func.getIterationCount()), keySizeProvider.getKeySize(encScheme), func.getPrf())); } Cipher cipher = Cipher.getInstance(alg.getEncryptionScheme().getAlgorithm().getId()); ASN1Encodable encParams = alg.getEncryptionScheme().getParameters(); if (encParams instanceof ASN1OctetString) { cipher.init(mode, key, new IvParameterSpec(ASN1OctetString.getInstance(encParams).getOctets())); } else { // TODO: at the moment it's just GOST, but... GOST28147Parameters gParams = GOST28147Parameters.getInstance(encParams); cipher.init(mode, key, new GOST28147ParameterSpec(gParams.getEncryptionParamSet(), gParams.getIV())); } return cipher; }