Java加密技术（二）—— AES128&DES&3DES

小鱼儿 2022-05-20 00:20 146阅读 0赞

public class AES128 {
        static String AES = "AES/ECB/NoPadding";
    
        public AES128() {
        }
    
        public static byte[] encrypt(byte[] key, byte[] data) {
            try {
                byte[] Encrypt_conn = null;
                if (data.length % 16 != 0) {
                    Encrypt_conn = new byte[(data.length / 16 + 1) * 16];
                    System.arraycopy(data, 0, Encrypt_conn, 0, data.length);
                } else {
                    Encrypt_conn = data;
                }
    
                SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
                Cipher cipher = Cipher.getInstance(AES);
                cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
                byte[] encrypted = cipher.doFinal(Encrypt_conn);
                return encrypted;
            } catch (Exception var6) {
                var6.printStackTrace();
                return null;
            }
        }
    
        public static byte[] decrypt(byte[] key, byte[] encrypted1) {
            try {
                SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
                Cipher cipher = Cipher.getInstance(AES);
                cipher.init(Cipher.DECRYPT_MODE, skeySpec);
                byte[] original = cipher.doFinal(encrypted1);
                return original;
            } catch (Exception var5) {
                var5.printStackTrace();
                return null;
            }
        }
    }

public class MyDES { 
        static String DES = "DES/ECB/NoPadding";
        static String TriDes = "DESede/ECB/NoPadding";
    
        public MyDES() {
        }
    
        /** * DES 加密 * @param key 8密钥 * @param data * @return */
        public static byte[] des_encrypt(byte[] key, byte[] data) {
            try {
                byte[] enc = null;
                byte[] bytReserve = null;
                KeySpec ks = new DESKeySpec(key);
                SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");
                SecretKey ky = kf.generateSecret(ks);
                Cipher c = Cipher.getInstance(DES);
                c.init(1, ky);
                if (data.length % 8 != 0) {
                    bytReserve = new byte[(data.length / 8 + 1) * 8];
                    System.arraycopy(data, 0, bytReserve, 0, data.length);
                    enc = c.doFinal(bytReserve);
                } else {
                    enc = c.doFinal(data);
                }
                return enc;
            } catch (Exception var8) {
                var8.printStackTrace();
                return null;
            }
        }
    
        /** * DES 解密 * @param key 密钥8 * @param data * @return */
        public static byte[] des_decrypt(byte[] key, byte[] data) {
            try {
                KeySpec ks = new DESKeySpec(key);
                System.out.println("KeySpec"+ks);
                SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");
                SecretKey ky = kf.generateSecret(ks);
                Cipher c = Cipher.getInstance(DES);
                c.init(2, ky);
                byte[] dec = c.doFinal(data);
                return dec;
            } catch (Exception var7) {
                return null;
            }
        }
    
        /** * 3DES * @param key 密钥16 * @param data * @return */
        public static byte[] trides_encrypt(byte[] key, byte[] data) {
            try {
                byte[] k = new byte[24];
                int len = data.length;
                if (data.length % 8 != 0) {
                    len = data.length - data.length % 8 + 8;
                }
    
                byte[] needData = null;
                if (len != 0) {
                    needData = new byte[len];
                }
    
                for (int i = 0; i < len; ++i) {
                    needData[i] = 0;
                }
    
                System.arraycopy(data, 0, needData, 0, data.length);
                System.out.println(Utils.byte2HexStr(key)+"传入密钥长度:"+key.length);
                if (key.length == 16) {
                    System.arraycopy(key, 0, k, 0, key.length);
                    System.arraycopy(key, 0, k, 16, 8);
                } else {
                    System.arraycopy(key, 0, k, 0, 24);
                }
                System.out.println(new String(k)+"密钥长度:"+k.length);
                KeySpec ks = new DESedeKeySpec(k);
                SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");
                SecretKey ky = kf.generateSecret(ks);
                Cipher c = Cipher.getInstance(TriDes);
                c.init(1, ky);
                byte[] enc = c.doFinal(needData);
                return enc;
            } catch (Exception var10) {
                var10.printStackTrace();
                return null;
            }
        }
    
        /** * 3DES解密 * @param key 密钥16 * @param data * @return */
        public static byte[] trides_decrypt(byte[] key, byte[] data) {
            try {
                byte[] k = new byte[24];
                int len = data.length;
                if (data.length % 8 != 0) {
                    len = data.length - data.length % 8 + 8;
                }
    
                byte[] needData = null;
                if (len != 0) {
                    needData = new byte[len];
                }
    
                for (int i = 0; i < len; ++i) {
                    needData[i] = 0;
                }
    
                System.arraycopy(data, 0, needData, 0, data.length);
                if (key.length == 16) {
                    System.arraycopy(key, 0, k, 0, key.length);
                    System.arraycopy(key, 0, k, 16, 8);
                } else {
                    System.arraycopy(key, 0, k, 0, 24);
                }
    
                KeySpec ks = new DESedeKeySpec(k);
                SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");
                SecretKey ky = kf.generateSecret(ks);
                Cipher c = Cipher.getInstance(TriDes);
                c.init(2, ky);
                byte[] dec = c.doFinal(needData);
                return dec;
            } catch (Exception var10) {
                return null;
            }
        }
    }