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作为程序员的你必须了解的常用加密算法( 三 )

加密算法

//非对称密钥算法public static final String KEY_ALGORITHM = "RSA";/*** 密钥长度，DH算法的默认密钥长度是1024* 密钥长度必须是64的倍数，在512到65536位之间*/private static final int KEY_SIZE = 1024;//公钥private static final String PUBLIC_KEY = "RSAPublicKey";//私钥private static final String PRIVATE_KEY = "RSAPrivateKey";/*** 初始化密钥对** @return Map 甲方密钥的Map*/public static Map<String, Object> initKey() throws Exception {//实例化密钥生成器KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);//初始化密钥生成器keyPairGenerator.initialize(KEY_SIZE);//生成密钥对KeyPair keyPair = keyPairGenerator.generateKeyPair();//甲方公钥RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();//甲方私钥RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();//将密钥存储在map中Map<String, Object> keyMap = new HashMap<String, Object>();keyMap.put(PUBLIC_KEY, publicKey);keyMap.put(PRIVATE_KEY, privateKey);return keyMap;}/*** 私钥加密** @param data 待加密数据* @param key密钥* @return byte[] 加密数据*/public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {//取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//生成私钥PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);//数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, privateKey);return cipher.doFinal(data);}/*** 公钥加密** @param data 待加密数据* @param key密钥* @return byte[] 加密数据*/public static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {//实例化密钥工厂KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//初始化公钥//密钥材料转换X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);//产生公钥PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);//数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, pubKey);return cipher.doFinal(data);}/*** 私钥解密** @param data 待解密数据* @param key密钥* @return byte[] 解密数据*/public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {//取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//生成私钥PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);//数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, privateKey);return cipher.doFinal(data);}/*** 公钥解密** @param data 待解密数据* @param key密钥* @return byte[] 解密数据*/public static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {//实例化密钥工厂KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//初始化公钥//密钥材料转换X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);//产生公钥PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);//数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, pubKey);return cipher.doFinal(data);}/*** 取得私钥** @param keyMap 密钥map* @return byte[] 私钥*/public static byte[] getPrivateKey(Map<String, Object> keyMap) {Key key = (Key) keyMap.get(PRIVATE_KEY);return key.getEncoded();}/*** 取得公钥** @param keyMap 密钥map* @return byte[] 公钥*/public static byte[] getPublicKey(Map<String, Object> keyMap) throws Exception {Key key = (Key) keyMap.get(PUBLIC_KEY);return key.getEncoded();}//非对称密钥算法public static final String KEY_ALGORITHM = "RSA";/*** 密钥长度，DH算法的默认密钥长度是1024* 密钥长度必须是64的倍数，在512到65536位之间*/private static final int KEY_SIZE = 1024;//公钥private static final String PUBLIC_KEY = "RSAPublicKey";//私钥private static final String PRIVATE_KEY = "RSAPrivateKey";/*** 初始化密钥对** @return Map 甲方密钥的Map*/public static Map<String, Object> initKey() throws Exception {//实例化密钥生成器KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(KEY_ALGORITHM);//初始化密钥生成器keyPairGenerator.initialize(KEY_SIZE);//生成密钥对KeyPair keyPair = keyPairGenerator.generateKeyPair();//甲方公钥RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();//甲方私钥RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();//将密钥存储在map中Map<String, Object> keyMap = new HashMap<String, Object>();keyMap.put(PUBLIC_KEY, publicKey);keyMap.put(PRIVATE_KEY, privateKey);return keyMap;}/*** 私钥加密** @param data 待加密数据* @param key密钥* @return byte[] 加密数据*/public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {//取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//生成私钥PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);//数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, privateKey);return cipher.doFinal(data);}/*** 公钥加密** @param data 待加密数据* @param key密钥* @return byte[] 加密数据*/public static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {//实例化密钥工厂KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//初始化公钥//密钥材料转换X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);//产生公钥PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);//数据加密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.ENCRYPT_MODE, pubKey);return cipher.doFinal(data);}/*** 私钥解密** @param data 待解密数据* @param key密钥* @return byte[] 解密数据*/public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {//取得私钥PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//生成私钥PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);//数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, privateKey);return cipher.doFinal(data);}/*** 公钥解密** @param data 待解密数据* @param key密钥* @return byte[] 解密数据*/public static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {//实例化密钥工厂KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);//初始化公钥//密钥材料转换X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);//产生公钥PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);//数据解密Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());cipher.init(Cipher.DECRYPT_MODE, pubKey);return cipher.doFinal(data);}/*** 取得私钥** @param keyMap 密钥map* @return byte[] 私钥*/public static byte[] getPrivateKey(Map<String, Object> keyMap) {Key key = (Key) keyMap.get(PRIVATE_KEY);return key.getEncoded();}/*** 取得公钥** @param keyMap 密钥map* @return byte[] 公钥*/public static byte[] getPublicKey(Map<String, Object> keyMap) throws Exception {Key key = (Key) keyMap.get(PUBLIC_KEY);return key.getEncoded();}


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