java加密解密接口

灰太狼 2022-10-05 09:46 151阅读 0赞

import org.apache.commons.lang3.StringUtils;
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    
    import javax.crypto.Cipher;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.DESKeySpec;
    import javax.crypto.spec.IvParameterSpec;
    import java.security.Key;
    import java.security.spec.AlgorithmParameterSpec;
    
    /**
     * 加密解密接口
     */
    public class EncryptUtil {
    
        /** 向量 */
        private final byte[] DESIV = new byte[]{0x12, 0x34, 0x56, 120, (byte) 0x90, (byte) 0xab, (byte) 0xcd,
                (byte) 0xef};
        /**加密算法的参数接口*/
        private AlgorithmParameterSpec iv = null;
        private Key key = null;
    
        private String charset = "UTF-8";
        private String encryptKey = "http://www.shutdown.cn";
    
        /**
         * 初始化
         *
         * @param defineKey 密钥
         * @param defineCharset 字符集
         * @throws Exception
         */
        public EncryptUtil(String defineKey, String defineCharset) throws Exception {
            if (StringUtils.isNotBlank(defineCharset)) {
                this.charset = defineCharset;
            }
            if (StringUtils.isNotBlank(defineKey)) {
                this.encryptKey = defineKey;
            }// 设置密钥参数
            DESKeySpec keySpec = new DESKeySpec(encryptKey.getBytes(charset));
            // 设置向量
            iv = new IvParameterSpec(DESIV);
            // 获得密钥工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // 得到密钥对象
            key = keyFactory.generateSecret(keySpec);
        }
    
        /**
         * 初始化
         * @throws Exception
         */
        public EncryptUtil() throws Exception {
            // 设置密钥参数
            DESKeySpec keySpec = new DESKeySpec(encryptKey.getBytes(charset));
            // 设置向量
            iv = new IvParameterSpec(DESIV);
            // 获得密钥工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // 得到密钥对象
            key = keyFactory.generateSecret(keySpec);
        }
    
        /**
         * 加密
         * @param data
         * @return
         * @throws Exception
         */
        public String encode(String data) {
            try {
                // 得到加密对象Cipher
                Cipher enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
                // 设置工作模式为加密模式，给出密钥和向量
                enCipher.init(Cipher.ENCRYPT_MODE, key, iv);
                byte[] pasByte = enCipher.doFinal(data.getBytes(charset));
                BASE64Encoder base64Encoder = new BASE64Encoder();
                return base64Encoder.encode(pasByte);
            } catch (Exception e) {
                return "";
            }
        }
    
        /**
         * 解密
         * @param data
         * @return
         * @throws Exception
         */
        public String decode(String data) {
            try {
                Cipher deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
                deCipher.init(Cipher.DECRYPT_MODE, key, iv);
                BASE64Decoder base64Decoder = new BASE64Decoder();
                byte[] pasByte = deCipher.doFinal(base64Decoder.decodeBuffer(data));
                return new String(pasByte, charset);
            } catch (Exception e) {
                return "";
            }
        }
    }