JAVA AES加密解密工具类

以你之姓@ 2022-10-01 12:59 149阅读 0赞

import javax.crypto.Cipher;
    import javax.crypto.spec.SecretKeySpec;
    
    public class AESUtil {
        
        private static final String KEY_AES = "AES";
    
        public static String encrypt(String src, String key) throws Exception {
            if (key == null || key.length() != 16) {
                throw new Exception("key不满足条件");
            }
            byte[] raw = key.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
            Cipher cipher = Cipher.getInstance(KEY_AES);
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
            byte[] encrypted = cipher.doFinal(src.getBytes());
            return byte2hex(encrypted);
        }
    
        public static String decrypt(String src, String key) throws Exception {
            if (key == null || key.length() != 16) {
                throw new Exception("key不满足条件");
            }
            byte[] raw = key.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
            Cipher cipher = Cipher.getInstance(KEY_AES);
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            byte[] encrypted1 = hex2byte(src);
            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString;
        }
    
        public static byte[] hex2byte(String strhex) {
            if (strhex == null) {
                return null;
            }
            int l = strhex.length();
            if (l % 2 == 1) {
                return null;
            }
            byte[] b = new byte[l / 2];
            for (int i = 0; i != l / 2; i++) {
                b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),
                        16);
            }
            return b;
        }
    
        public static String byte2hex(byte[] b) {
            StringBuilder hs = new StringBuilder();
            String stmp = "";
            for (int n = 0; n < b.length; n++) {
                stmp = (Integer.toHexString(b[n] & 0XFF));
                if (stmp.length() == 1) {
                    hs.append("0").append(stmp);
                } else {
                    hs.append(stmp);
                }
            }
            return hs.toString().toUpperCase();
        }
    
        public static void main(String[] args) throws Exception {
            String content = "testContext";
            System.out.println("原内容 = " + content);
            String encrypt = AESUtil.encrypt(content, "key_value_length");
            System.out.println("加密后 = " + encrypt);
            String decrypt = AESUtil.decrypt(encrypt, "key_value_length");
            System.out.println("解密后 = " + decrypt);
        }
    
    }