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AES加密解密,SHA1、SHA加密, MD5加密

AES加密解密,SHA1、SHA加密, MD5加密

作者: 锄禾日当 | 来源:发表于2016-10-15 19:15 被阅读270次
    package com.luo.util;
    import java.io.UnsupportedEncodingException;
    import java.security.InvalidKeyException;
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.security.SecureRandom;
    import javax.crypto.BadPaddingException;
    import javax.crypto.Cipher;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.SecretKey;
    import javax.crypto.spec.SecretKeySpec;
    public class DecriptUtil {
    
        /** 
         * @description: AES加密
         * @parameter: str:待加密字符串,secretKeyBase:用于生成密钥的基础字符串
         * @return:  加密字节数组
        **/
        public static byte[] encryptAES(String str, String secretKeyBase) {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
                SecretKey secretKey = kgen.generateKey();
                byte[] enCodeFormat = secretKey.getEncoded();
                SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
                Cipher cipher = Cipher.getInstance("AES");// 创建密码器
                byte[] byteContent = str.getBytes("UTF-8");
                cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
                byte[] result = cipher.doFinal(byteContent);
                return result; // 加密
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (InvalidKeyException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) {
                e.printStackTrace();
            } catch (BadPaddingException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        /** 
         * @description: AES解密
         * @parameter: strByteArray:待解密字节数组,
         * @parameter: secretKeyBase:用于生成密钥的基础字符串, 需要注意的是EAS是对称加密,所以secretKeyBase在加密解密时要一样的
         * @return:  解密后字符串
        **/
        public static String decryptAES(byte[] strByteArray, String secretKeyBase) {
            try {
                KeyGenerator kgen = KeyGenerator.getInstance("AES");
                kgen.init(128, new SecureRandom(secretKeyBase.getBytes()));
                SecretKey secretKey = kgen.generateKey();
                byte[] enCodeFormat = secretKey.getEncoded();
                SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
                Cipher cipher = Cipher.getInstance("AES");// 创建密码器
                cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
                String result = new String(cipher.doFinal(strByteArray),"UTF-8");
                return result; // 加密
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            } catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (InvalidKeyException e) {
                e.printStackTrace();
            } catch (IllegalBlockSizeException e) {
                e.printStackTrace();
            } catch (BadPaddingException e) {
                e.printStackTrace();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        /** 
         * @description: SHA、SHA1加密
         * @parameter:   str:待加密字符串
         * @return:  加密串
        **/
        public static String SHA1(String str) {
            try {
                MessageDigest digest = java.security.MessageDigest
                        .getInstance("SHA-1"); //如果是SHA加密只需要将"SHA-1"改成"SHA"即可
                digest.update(str.getBytes());
                byte messageDigest[] = digest.digest();
                // Create Hex String
                StringBuffer hexStr = new StringBuffer();
                // 字节数组转换为 十六进制 数
                for (int i = 0; i < messageDigest.length; i++) {
                    String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                    if (shaHex.length() < 2) {
                        hexStr.append(0);
                    }
                    hexStr.append(shaHex);
                }
                return hexStr.toString();
    
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
            return null;
        }
    
        /** 
         * @description: MD5加密
         * @parameter:   str:待加密字符串
         * @return:  加密串
        **/
        public static String MD5(String str) {
            try {
                // 获得MD5摘要算法的 MessageDigest 对象
                MessageDigest mdInst = MessageDigest.getInstance("MD5");
                // 使用指定的字节更新摘要
                mdInst.update(str.getBytes());
                // 获得密文
                byte[] md = mdInst.digest();
                // 把密文转换成十六进制的字符串形式
                StringBuffer hexString = new StringBuffer();
                // 字节数组转换为 十六进制 数
                for (int i = 0; i < md.length; i++) {
                    String shaHex = Integer.toHexString(md[i] & 0xFF);
                    if (shaHex.length() < 2) {
                        hexString.append(0);
                    }
                    hexString.append(shaHex);
                }
                return hexString.toString();
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
            return null;
        }
    
    }
    

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