Java Code Examples for javax.crypto.KeyGenerator#init()

private static void addaccesskey(String keystorelocation, String password) throws Exception {
    KeyStore keystore = KeyStore.getInstance("BCFKS", BC_FIPS_PROVIDER);
    keystore.load(new FileInputStream(keystorelocation), password.toCharArray());
    KeyGenerator keygen = KeyGenerator.getInstance("AES", BC_FIPS_PROVIDER);
    keygen.init(128);
    SecretKey sk = keygen.generateKey();
    String secretkey = Hex.toHexString(sk.getEncoded());

    MessageDigest digest = MessageDigest.getInstance("SHA-1");
    digest.update(new Date().toString().getBytes());
    String accesskey = Hex.toHexString(digest.digest()).substring(0, 16);

    keystore.setKeyEntry(accesskey, sk, password.toCharArray(), null);
    keystore.store(new FileOutputStream(keystorelocation), password.toCharArray());
    System.out.println("Created new access/secret key:");
    System.out.println("Access key:" + accesskey);
    System.out.println("Secret key:" + secretkey);
}
 

@Override
public void create_key_if_not_available() throws KeyStoreException {
    if (get(alias) == null) {
        try {
            KeyGenerator kg = KeyGenerator.getInstance("AES");
            kg.init(KEY_LENGTH);
            SecretKey key = kg.generateKey();

            boolean success = put(getBytes(alias), key.getEncoded());
            if (!success) {
                throw new KeyStoreException("Keystore error");
            }
        } catch (Exception e) {
            throw new KeyStoreException(e);
        }
    }
}
 

/**
 * Initialize IV, IV with offset, plain text, AAD and SecretKey
 *
 * @param keyLength length of a secret key
 * @param tagLength tag length
 * @param IVlength IV length
 * @param offset offset in a buffer for IV
 * @param textLength plain text length
 * @param AADLength AAD length
 */
public GCMParameterSpecTest(int keyLength, int tagLength, int IVlength,
        int offset, int textLength, int AADLength)
        throws NoSuchAlgorithmException, NoSuchProviderException {
    this.tagLength = tagLength; // save tag length
    this.IVlength = IVlength; // save IV length
    this.offset = offset; // save IV offset

    // prepare IV
    IV = Helper.generateBytes(IVlength);

    // prepare IV with offset
    IVO = new byte[this.IVlength + this.offset];
    System.arraycopy(IV, 0, IVO, offset, this.IVlength);

    // prepare data
    data = Helper.generateBytes(textLength);

    // prepare AAD
    AAD = Helper.generateBytes(AADLength);

    // init a secret key
    KeyGenerator kg = KeyGenerator.getInstance("AES", "SunJCE");
    kg.init(keyLength);
    key = kg.generateKey();
}
 

/**
 * 获取256位的加密密钥
 * @param seed
 * @return
 * @throws Exception
 */
@SuppressLint("TrulyRandom")
private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    SecureRandom sr = null;
    // 在4.2以上版本中，SecureRandom获取方式发生了改变
    if (android.os.Build.VERSION.SDK_INT >= JELLY_BEAN_4_2) {
        sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
    } else {
        sr = SecureRandom.getInstance("SHA1PRNG");
    }
    sr.setSeed(seed);
    // 256 bits or 128 bits,192bits
    kgen.init(256, sr);
    SecretKey skey = kgen.generateKey();
    byte[] raw = skey.getEncoded();
    return raw;
}
 

/**
 * 生成密钥 <br>
 * Java 6 只支持56bit密钥 <br>
 * Bouncy Castle 支持64bit密钥 <br>
 *
 * @return byte[] 二进制密钥
 *
 * @throws Exception
 */
public static byte[] initKey() throws NoSuchAlgorithmException {

    /*
    实例化密钥生成器
    若要使用64bit密钥注意替换 将下述代码中的KeyGenerator.getInstance(CIPHER_ALGORITHM);
    替换为KeyGenerator.getInstance(CIPHER_ALGORITHM, "BC");
    */
    KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);

    /*初始化密钥生成器 若要使用64bit密钥注意替换 将下述代码kg.init(56); 替换为kg.init(64);*/
    kg.init(56, new SecureRandom());

    // 生成秘密密钥
    SecretKey secretKey = kg.generateKey();

    // 获得密钥的二进制编码形式
    return secretKey.getEncoded();
}
 

/**
 * 生成加密秘钥
 *
 * @return
 */
private static SecretKeySpec getSecretKey(final String password) throws NoSuchAlgorithmException {
    //返回生成指定算法密钥生成器的 KeyGenerator 对象
    KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    // javax.crypto.BadPaddingException: Given final block not properly padded解决方案
    // https://www.cnblogs.com/zempty/p/4318902.html - 用此法解决的
    // https://www.cnblogs.com/digdeep/p/5580244.html - 留作参考吧
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
    random.setSeed(password.getBytes());
    //AES 要求密钥长度为 128
    kg.init(128, random);

    //生成一个密钥
    SecretKey secretKey = kg.generateKey();
    // 转换为AES专用密钥
    return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);
}
 

/**
 * 生成一个密钥
 *
 * @return 密钥的二进制形式
 */
public byte[] initKey() {
    KeyGenerator kg = getKeyGenerator();
    kg.init(getConfiguration().getKeySize());
    SecretKey secretKey = kg.generateKey();
    return secretKey.getEncoded();
}
 

/**
 * 生成密钥
 * @return 密钥 byte[]
 */
public static byte[] initKey() {
    try {
        KeyGenerator keyGen = KeyGenerator.getInstance("AES");
        keyGen.init(256); // 192 256
        SecretKey secretKey = keyGen.generateKey();
        return secretKey.getEncoded();
    } catch (Exception e) {
        JCLogUtils.eTag(TAG, e, "initKey");
    }
    return null;
}
 

/**
 * 
 * AES CBC加密
 * 
 * 数据块：128位
 * 
 * @param strMsg
 *            ： 需要加密的字符串
 * @param sKey
 *            :加密key(16位)
 * @param sKeyFormat
 *            :skey是否格式处理
 * @param ivParameter
 *            :偏移量(16位)使用CBC模式，需要一个向量iv，可增加加密算法的强度
 * @param encoding
 *            :编码
 * @return ：16进制的加密字符串
 */
public static String encryptByAesCBC(String strMsg, String sKey, boolean sKeyFormat, String ivParameter,
        String encoding) {

    try {
        byte[] keyByte = null;
        if (sKeyFormat) {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(sKey.getBytes()));
            SecretKey secretKey = kgen.generateKey();
            keyByte = secretKey.getEncoded();

        }
        else {
            keyByte = sKey.getBytes(encoding);
        }

        SecretKeySpec skeySpec = new SecretKeySpec(keyByte, "AES");
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// 算法/模式/补码方式
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
        byte[] resultByte = cipher.doFinal(strMsg.getBytes(encoding));

        // 传输过程,转成16进制
        String resultStr = parseByte2HexStr(resultByte);
        return resultStr;
    }
    catch (Exception ex) {
        ex.printStackTrace();
        return "";
    }
}
 

private static void test(KeyGenerator kg,
        int clientVersion, int serverVersion) throws Exception {

    System.out.printf(
            "Testing RSA pre-master secret key generation between " +
            "client (0x%04X) and server(0x%04X)%n",
            clientVersion, serverVersion);
    kg.init(new TlsRsaPremasterSecretParameterSpec(
                                clientVersion, serverVersion));
    SecretKey key = kg.generateKey();
    byte[] encoded = key.getEncoded();
    if (encoded != null) {  // raw key material may be not extractable
        if (encoded.length != 48) {
            throw new Exception("length: " + encoded.length);
        }
        int v = versionOf(encoded[0], encoded[1]);
        if (clientVersion != v) {
            if (serverVersion != v || clientVersion >= 0x0302) {
                throw new Exception(String.format(
                    "version mismatch: (0x%04X) rather than (0x%04X) " +
                    "is used in pre-master secret", v, clientVersion));
            }
            System.out.printf("Use compatible version (0x%04X)%n", v);
        }
        System.out.println("Passed, version matches!");
   } else {
        System.out.println("Raw key material is not extractable");
   }
}
 

private static byte[] getRawKey(byte[] seed) throws Exception {
    KeyGenerator kGen = KeyGenerator.getInstance("AES");
    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
    sr.setSeed(seed);
    kGen.init(128, sr); // 192 and 256 bits may not be available
    SecretKey sKey = kGen.generateKey();
    return sKey.getEncoded();
}
 

/**
 * 获取密钥
 *
 * @return
 * @throws Exception
 */
public static Key getKey() throws Exception {
    //实例化
    KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
    //AES 要求密钥长度为128位、192位或256位
    kg.init(KEY_SIZE);
    //生成密钥
    SecretKey secretKey = kg.generateKey();
    return secretKey;
}
 

public static byte[] createBlob(String keyAlias, byte[] data, byte[] applicationId, long sid) {
    try {
        KeyGenerator keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES);
        keyGenerator.init(new SecureRandom());
        SecretKey secretKey = keyGenerator.generateKey();
        KeyStore keyStore = KeyStore.getInstance("AndroidKeyStore");
        keyStore.load(null);
        KeyProtection.Builder builder = new KeyProtection.Builder(KeyProperties.PURPOSE_DECRYPT)
                .setBlockModes(KeyProperties.BLOCK_MODE_GCM)
                .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
                .setCriticalToDeviceEncryption(true);
        if (sid != 0) {
            builder.setUserAuthenticationRequired(true)
                    .setBoundToSpecificSecureUserId(sid)
                    .setUserAuthenticationValidityDurationSeconds(USER_AUTHENTICATION_VALIDITY);
        }

        keyStore.setEntry(keyAlias,
                new KeyStore.SecretKeyEntry(secretKey),
                builder.build());
        byte[] intermediate = encrypt(applicationId, APPLICATION_ID_PERSONALIZATION, data);
        return encrypt(secretKey, intermediate);
    } catch (CertificateException | IOException | BadPaddingException
            | IllegalBlockSizeException
            | KeyStoreException | NoSuchPaddingException | NoSuchAlgorithmException
            | InvalidKeyException e) {
        e.printStackTrace();
        throw new RuntimeException("Failed to encrypt blob", e);
    }
}
 

/**
 * @param provider Security provider
 * @param algorithm Security algorithm to test
 * @param mode The mode (GCM is only expected)
 * @param padding Algorithm padding
 * @param keyStrength key length
 * @param textLength Plain text length
 * @param AADLength Additional data length
 */
public Encrypt(Provider provider, String algorithm, String mode,
        String padding, int keyStrength, int textLength, int AADLength)
        throws Exception {

    // init a secret Key
    KeyGenerator kg = KeyGenerator.getInstance(algorithm, provider);
    kg.init(keyStrength);
    key = kg.generateKey();

    this.provider = provider;
    this.transformation = algorithm + "/" + mode + "/" + padding;
    this.textLength = textLength;
    this.AADLength = AADLength;
}
 

private static void doTest(String provider, String algo) throws Exception {
    SecretKey key;
    SecretKey keyToWrap;

    // init a secret Key
    KeyGenerator kg = KeyGenerator.getInstance(AES, PROVIDER);
    kg.init(KEY_LENGTH);
    key = kg.generateKey();
    keyToWrap = kg.generateKey();

    // initialization
    Cipher cipher = Cipher.getInstance(algo, provider);
    cipher.init(Cipher.WRAP_MODE, key);
    AlgorithmParameters params = cipher.getParameters();

    // wrap the key
    byte[] keyWrapper = cipher.wrap(keyToWrap);
    try {
        // check if we can't wrap it again with the same key/IV
        keyWrapper = cipher.wrap(keyToWrap);
        throw new RuntimeException(
                "FAILED: expected IllegalStateException hasn't "
                        + "been thrown ");
    } catch (IllegalStateException ise) {
        System.out.println(ise.getMessage());
        System.out.println("Expected exception");
    }

    // unwrap the key
    cipher.init(Cipher.UNWRAP_MODE, key, params);
    cipher.unwrap(keyWrapper, algo, Cipher.SECRET_KEY);

    // check if we can unwrap second time
    Key unwrapKey = cipher.unwrap(keyWrapper, algo, Cipher.SECRET_KEY);

    if (!Arrays.equals(keyToWrap.getEncoded(), unwrapKey.getEncoded())) {
        throw new RuntimeException(
                "FAILED: original and unwrapped keys are not equal");
    }
}
 

public static void main(String[] args) throws Exception {
    Provider provider = Security.getProvider("SunJCE");

    InputStream in = new FileInputStream(new File(BASE, "masterdata.txt"));
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));

    int n = 0;
    int lineNumber = 0;

    String algorithm = null;
    byte[] premaster = null;
    byte[] clientRandom = null;
    byte[] serverRandom = null;
    int protoMajor = 0;
    int protoMinor = 0;
    int preMajor = 0;
    int preMinor = 0;
    byte[] master = null;

    while (true) {
        String line = reader.readLine();
        lineNumber++;
        if (line == null) {
            break;
        }
        if (line.startsWith("m-") == false) {
            continue;
        }
        String data = line.substring(PREFIX_LENGTH);
        if (line.startsWith("m-algorithm:")) {
            algorithm = data;
        } else if (line.startsWith("m-premaster:")) {
            premaster = parse(data);
        } else if (line.startsWith("m-crandom:")) {
            clientRandom = parse(data);
        } else if (line.startsWith("m-srandom:")) {
            serverRandom = parse(data);
        } else if (line.startsWith("m-protomajor:")) {
            protoMajor = Integer.parseInt(data);
        } else if (line.startsWith("m-protominor:")) {
            protoMinor = Integer.parseInt(data);
        } else if (line.startsWith("m-premajor:")) {
            preMajor = Integer.parseInt(data);
        } else if (line.startsWith("m-preminor:")) {
            preMinor = Integer.parseInt(data);
        } else if (line.startsWith("m-master:")) {
            master = parse(data);

            System.out.print(".");
            n++;

            KeyGenerator kg =
                KeyGenerator.getInstance("SunTlsMasterSecret", provider);
            SecretKey premasterKey =
                new SecretKeySpec(premaster, algorithm);
            TlsMasterSecretParameterSpec spec =
                new TlsMasterSecretParameterSpec(premasterKey, protoMajor,
                    protoMinor, clientRandom, serverRandom,
                    null, -1, -1);
            kg.init(spec);
            TlsMasterSecret key = (TlsMasterSecret)kg.generateKey();
            byte[] enc = key.getEncoded();
            if (Arrays.equals(master, enc) == false) {
                throw new Exception("mismatch line: " + lineNumber);
            }
            if ((preMajor != key.getMajorVersion()) ||
                    (preMinor != key.getMinorVersion())) {
                throw new Exception("version mismatch line: " + lineNumber);
            }
        } else {
            throw new Exception("Unknown line: " + line);
        }
    }
    if (n == 0) {
        throw new Exception("no tests");
    }
    in.close();
    System.out.println();
    System.out.println("OK: " + n + " tests");
}
 

/**
 * 为密钥文件目录自动创建密钥, 只能从管理节点调用
 * @param keyFileIni INI格式Key文件
 */
public static void createKeyFile(File keyFile) throws Exception
{
    if ( keyFile.length()>0 ) {
        logger.debug("Encryption key file "+keyFile+" exists, length "+keyFile.length());
        return;
    }
    Base64.Encoder encoder = Base64.getEncoder();

    KeyGenerator aesGen = KeyGenerator.getInstance("AES");
    aesGen.init(256); // 192 and 256 bits may not be available
    SecretKey aesKey = aesGen.generateKey();

    KeyPairGenerator rsaGenerator = KeyPairGenerator.getInstance("RSA");
    rsaGenerator.initialize(1024);

    KeyPair keyPair = rsaGenerator.generateKeyPair();
    PublicKey pub = keyPair.getPublic();
    PrivateKey priv = keyPair.getPrivate();
    String pubBase64 = encoder.encodeToString(pub.getEncoded());
    SecureRandom random = new SecureRandom();
    byte[] salt = new byte[20];
    random.nextBytes(salt);
    StringBuilder saltStr = new StringBuilder(128);
    for(int i=0;i<salt.length;i++) {
        if ( i>0 )
            saltStr.append(",");
        saltStr.append( Integer.toHexString( ((salt[i])&0XFF)) );
    }
    Cipher pbeCipher = getPBECipher(salt, Cipher.ENCRYPT_MODE);
    String aesBase64 = encoder.encodeToString(pbeCipher.doFinal(aesKey.getEncoded()));
    String privBase64 = encoder.encodeToString(pbeCipher.doFinal(priv.getEncoded()));
    String aesId = "key_"+Base58.compressedUUID(UUID.randomUUID());
    String rsaId = "key_"+Base58.compressedUUID(UUID.randomUUID());
    IniWriter iniWrite = new IniWriter(FileUtil.bufferedWrite(keyFile));
    iniWrite.writeSection("info");
    iniWrite.writeProperty("aesId", aesId);
    iniWrite.writeProperty("rsaId", rsaId);
    iniWrite.writeProperty("createdTime", LocalDateTime.now());
    iniWrite.writeProperty("publicFormat", pub.getFormat());
    iniWrite.writeProperty("privateFormat", priv.getFormat());
    iniWrite.writeProperty("salt", saltStr.toString());
    iniWrite.writeSection("aes");
    iniWrite.write(aesBase64);
    iniWrite.writeSection("public");
    iniWrite.write(pubBase64);
    iniWrite.writeSection("private");
    iniWrite.write(privBase64);
    iniWrite.close();
    logger.info("Create encryption file "+keyFile+" with key ids: "+aesId+", "+rsaId);
}
 

private void wrapperBlowfishKeyTest() throws InvalidKeyException,
        NoSuchAlgorithmException, NoSuchPaddingException,
        IllegalBlockSizeException, InvalidAlgorithmParameterException {
    // how many kinds of padding mode
    int padKinds;
    // Keysize should be multiple of 8 bytes.
    int KeyCutter = 8;
    int kSize = BLOWFISH_MIN_KEYSIZE;
    String algorithm = "Blowfish";
    int maxAllowKeyLength = Cipher.getMaxAllowedKeyLength(algorithm);
    boolean unLimitPolicy = maxAllowKeyLength == Integer.MAX_VALUE;
    SecretKey key = null;
    while (kSize <= BLOWFISH_MAX_KEYSIZE) {
        for (String mode : MODEL_AR) {
            // PKCS5padding is meaningful only for ECB, CBC, PCBC
            if (mode.equalsIgnoreCase(MODEL_AR[0])
                    || mode.equalsIgnoreCase(MODEL_AR[1])
                    || mode.equalsIgnoreCase(MODEL_AR[2])) {
                padKinds = PADDING_AR.length;
            } else {
                padKinds = 1;
            }
            // Initialization
            KeyGenerator kg = KeyGenerator.getInstance(algorithm);
            for (int k = 0; k < padKinds; k++) {
                String transformation = algorithm + "/" + mode + "/"
                        + PADDING_AR[k];
                if (NOPADDING.equals(PADDING_AR[k]) && kSize % 64 != 0) {
                    out.println(transformation
                            + " will not run if input length not multiple"
                            + " of 8 bytes when padding is " + NOPADDING);
                    continue;
                }
                kg.init(kSize);
                key = kg.generateKey();
                // only run the tests on longer key lengths if unlimited
                // version of JCE jurisdiction policy files are installed
                if (!unLimitPolicy && kSize > LINIMITED_KEYSIZE) {
                    out.println("keyStrength > 128 within " + algorithm
                            + " will not run under global policy");
                } else {
                    wrapTest(transformation, transformation, key, key,
                            Cipher.SECRET_KEY, false);
                }
            }
        }
        if (kSize <= LINIMITED_KEYSIZE) {
            KeyCutter = 8;
        } else {
            KeyCutter = 48;
        }
        kSize += KeyCutter;
    }
}
 

/**
 * Initialize the private key for given algorithm+keySize once in the lifetime
 * of distributed system.
 */
public static String initializePrivateKey(String algo, int keySize,
    final LanguageConnectionContext lcc) throws Exception {
  // create the private key used for symmetric encryption of user provided
  // passwords and other secrets, if not created yet; this is done only
  // once in the entire lifetime of a distributed system for a particular
  // algorithm+keySize combination
  final GemFireStore store = Misc.getMemStoreBooting();
  if (algo == null) {
    algo = GfxdConstants.PASSWORD_PRIVATE_KEY_ALGO_DEFAULT;
  }
  if (keySize <= 0) {
    keySize = GfxdConstants.PASSWORD_PRIVATE_KEY_SIZE_DEFAULT;
  }
  final String secretProp = GemFireXDUtils.getPrivateKeyDBKey(algo, keySize);
  String secret = PropertyUtil.getDatabaseProperty(store, secretProp);
  if (secret == null) {
    final GfxdDataDictionary dd = store.getDatabase().getDataDictionary();
    // acquire DD write lock first
    final TransactionController tc = lcc != null ? lcc
        .getTransactionExecute() : null;
    final boolean ddLocked = dd.lockForWriting(tc, false);
    try {
      // check again
      secret = PropertyUtil.getDatabaseProperty(store, secretProp);
      if (secret == null) {
        // generate new private key
        KeyGenerator gen = KeyGenerator.getInstance(algo);
        gen.init(keySize);
        byte[] key = gen.generateKey().getEncoded();
        secret = ClientSharedUtils.toHexString(key, 0, key.length);
        store.setProperty(secretProp, secret, false);
        // lets publish this database property so that all JVMs see it
        GfxdSystemProcedures.publishMessage(
            new Object[] { secretProp, secret }, false,
            GfxdSystemProcedureMessage.SysProcMethod.setDatabaseProperty,
            true, true);
      }
    } finally {
      if (ddLocked) {
        dd.unlockAfterWriting(tc, false);
      }
    }
  }
  return secret;
}
 

/**
 * Generate a new AES key used to encrypt the message.
 *
 * @param keyType Key Type
 * @param keyLength Key Length in bit
 * @return new AES key
 *
 * @throws NoSuchAlgorithmException if no such algorithm is available.
 */
public static byte[] generateKey(String keyType, int keyLength) throws NoSuchAlgorithmException {
    KeyGenerator generator = KeyGenerator.getInstance(keyType);
    generator.init(keyLength);
    return generator.generateKey().getEncoded();
}