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  • AES 加密解密

    package com.bmcc.open.portal.auth.demo.test;
    import javax.crypto.Cipher;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    
    import com.bmcc.open.portal.auth.demo.util.AESUtil;
    
    import Decoder.BASE64Decoder;
    import Decoder.BASE64Encoder;
    
    
    
    /**
     * AES 是一种可逆加密算法,对用户的敏感信息加密处理 对原始数据进行AES加密后,在进行Base64编码转化;
     */
    public class EncryptionAndDecryption {
    
        /*
         * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式,key需要为16位。
         */
        private String sKey = "9231547690624328";//key,可自行修改
        private String ivParameter = "0102030405060708";//偏移量,可自行修改
        private static EncryptionAndDecryption instance = null;
    
        private EncryptionAndDecryption() {
    
        }
    
        public static EncryptionAndDecryption getInstance() {
            if (instance == null)
                instance = new EncryptionAndDecryption();
            return instance;
        }
    
        public static String Encrypt(String encData ,String secretKey,String vector) throws Exception {
    
            if(secretKey == null) {
                return null;
            }
            if(secretKey.length() != 16) {
                return null;
            }
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            byte[] raw = secretKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            IvParameterSpec iv = new IvParameterSpec(vector.getBytes());// 使用CBC模式,需要一个向量iv,可增加加密算法的强度
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(encData.getBytes("utf-8"));
            return new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
        }
        /**将二进制转换成16进制 
         * @param buf 
         * @return 
         */  
        public static String parseByte2HexStr(byte buf[]) {  
            StringBuffer sb = new StringBuffer();  
            for (int i = 0; i < buf.length; i++) {  
                String hex = Integer.toHexString(buf[i] & 0xFF);  
                if (hex.length() == 1) {  
                    hex = '0' + hex;  
                }  
                sb.append(hex.toUpperCase());  
            }  
            return sb.toString();  
        } 
    
        // 加密
        public byte[] encrypt(String sSrc) throws Exception {
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            byte[] raw = sKey.getBytes();
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式,需要一个向量iv,可增加加密算法的强度
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
            return encrypted;//new BASE64Encoder().encode(encrypted);// 此处使用BASE64做转码。
        }
    
        // 解密
        public String decrypt(byte sSrc[]) throws Exception {
            try {
                byte[] raw = sKey.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
                byte[] encrypted1 = sSrc;//new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception ex) {
                return null;
            }
        }
    
        public String decrypt(String sSrc,String key,String ivs) throws Exception {
            try {
                byte[] raw = key.getBytes("ASCII");
                SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                IvParameterSpec iv = new IvParameterSpec(ivs.getBytes());
                cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
                byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception ex) {
                return null;
            }
        }
          /**将16进制转换为二进制 
         * @param hexStr 
         * @return 
         */  
        public static byte[] parseHexStr2Byte(String hexStr) {  
                if (hexStr.length() < 1)  
                        return null;  
                byte[] result = new byte[hexStr.length()/2];  
                for (int i = 0;i< hexStr.length()/2; i++) {  
                        int high = Integer.parseInt(hexStr.substring(i*2, i*2+1), 16);  
                        int low = Integer.parseInt(hexStr.substring(i*2+1, i*2+2), 16);  
                        result[i] = (byte) (high * 16 + low);  
                }  
                return result;  
        }
        
        
        public static String encodeBytes(byte[] bytes) {
            StringBuffer strBuf = new StringBuffer();
    
            for (int i = 0; i < bytes.length; i++) {
                strBuf.append((char) (((bytes[i] >> 4) & 0xF) + ((int) 'a')));
                strBuf.append((char) (((bytes[i]) & 0xF) + ((int) 'a')));
            }
    
            return strBuf.toString();
        }
    
        public static void main(String[] args) throws Exception {
            // 需要加密的字串
            String cSrc = "斯蒂芬地方";
            // 加密
            byte[] enString = EncryptionAndDecryption.getInstance().encrypt(cSrc);
            String encryptResultStr = parseByte2HexStr(enString);
            System.out.println("加密后:" + encryptResultStr);
            
            // 解密
            byte[] decryptFrom = AESUtil.parseHexStr2Byte("9A33BC1DD60233E4786CA1E682812B8D7AE2F7DF2A685A6C06C0A261FC180D1F4BF816937730B34CBB463B7DF4C5B71AE0AB7E5E27AFF6D3E031E8EAA7A3AFB9304EC367F7173314004C003E5AB3AA025A8CFBB7938DF29BE1BB988E95C532847C6D20B5EB3E6601EDB44C4FB3822F7DA0FD701FD00DC2D58D146F1E04A2D8E49B28D5BEFCA8B82D13F8019CD5414B18580497602783EBE75098038EF0031A5383C4F65F2696CD0706DAE91B4B6CC00A15741E709C547213539B3389644C5F0CC29F9F716BF649AEB554A36611BA1831"); 
            String DeString = EncryptionAndDecryption.getInstance().decrypt(decryptFrom);
            System.out.println("解密后的字串是:" + DeString);
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/zqzdong/p/7230380.html
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