AES和RSA算法的demo代码

aes代码示例：

package com.autoyol.util.security.test;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.interfaces.RSAPublicKey;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

public class AESCoder {
    /**
     * 密钥算法
     */
    private static final String KEY_ALGORITHM = "AES";

    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";

    /**
     * 初始化密钥
     *
     * @return byte[] 密钥
     * @throws Exception
     */
    public static byte[] initSecretKey() {
        //返回生成指定算法的秘密密钥的 KeyGenerator 对象
        KeyGenerator kg = null;
        try {
            kg = KeyGenerator.getInstance(KEY_ALGORITHM);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return new byte[0];
        }
        //初始化此密钥生成器，使其具有确定的密钥大小
        //AES 要求密钥长度为 128
        kg.init(128);
        //生成一个密钥
        SecretKey  secretKey = kg.generateKey();
        return secretKey.getEncoded();
    }

    /**
     * 转换密钥
     *
     * @param key   二进制密钥
     * @return 密钥
     */
    public static Key toKey(byte[] key){
        //生成密钥
        return new SecretKeySpec(key, KEY_ALGORITHM);
    }

    /**
     * 加密
     *
     * @param data  待加密数据
     * @param key   密钥
     * @return byte[]   加密数据
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data,Key key) throws Exception{
        return encrypt(data, key,DEFAULT_CIPHER_ALGORITHM);
    }

    /**
     * 加密
     *
     * @param data  待加密数据
     * @param key   二进制密钥
     * @return byte[]   加密数据
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data,byte[] key) throws Exception{
        return encrypt(data, key,DEFAULT_CIPHER_ALGORITHM);
    }

    /**
     * 加密
     *
     * @param data  待加密数据
     * @param key   二进制密钥
     * @param cipherAlgorithm   加密算法/工作模式/填充方式
     * @return byte[]   加密数据
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data,byte[] key,String cipherAlgorithm) throws Exception{
        //还原密钥
        Key k = toKey(key);
        return encrypt(data, k, cipherAlgorithm);
    }

    /**
     * 加密
     *
     * @param data  待加密数据
     * @param key   密钥
     * @param cipherAlgorithm   加密算法/工作模式/填充方式
     * @return byte[]   加密数据
     * @throws Exception
     */
    public static byte[] encrypt(byte[] data,Key key,String cipherAlgorithm) throws Exception{
        //实例化
        Cipher cipher = Cipher.getInstance(cipherAlgorithm);
        //使用密钥初始化，设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, key);
        //执行操作
        return cipher.doFinal(data);
    }

    /**
     * 解密
     *
     * @param data  待解密数据
     * @param key   二进制密钥
     * @return byte[]   解密数据
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data,byte[] key) throws Exception{
        return decrypt(data, key,DEFAULT_CIPHER_ALGORITHM);
    }

    /**
     * 解密
     *
     * @param data  待解密数据
     * @param key   密钥
     * @return byte[]   解密数据
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data,Key key) throws Exception{
        return decrypt(data, key,DEFAULT_CIPHER_ALGORITHM);
    }

    /**
     * 解密
     *
     * @param data  待解密数据
     * @param key   二进制密钥
     * @param cipherAlgorithm   加密算法/工作模式/填充方式
     * @return byte[]   解密数据
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data,byte[] key,String cipherAlgorithm) throws Exception{
        //还原密钥
        Key k = toKey(key);
        return decrypt(data, k, cipherAlgorithm);
    }

    /**
     * 解密
     *
     * @param data  待解密数据
     * @param key   密钥
     * @param cipherAlgorithm   加密算法/工作模式/填充方式
     * @return byte[]   解密数据
     * @throws Exception
     */
    public static byte[] decrypt(byte[] data,Key key,String cipherAlgorithm) throws Exception{
        //实例化
        Cipher cipher = Cipher.getInstance(cipherAlgorithm);
        //使用密钥初始化，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, key);
        //执行操作
        return cipher.doFinal(data);
    }

    public static String  showByteArray(byte[] data){
        if(null == data){
            return null;
        }
        StringBuilder sb = new StringBuilder("{");
        for(byte b:data){
            sb.append(b).append(",");
        }
        sb.deleteCharAt(sb.length()-1);
        sb.append("}");
        return sb.toString();
    }

    public static void main(String[] args) throws Exception {
        byte[] key = initSecretKey();
        System.out.println("key："+Base64.encodeBase64String(key));
        System.out.println("key："+showByteArray(key));

        String md5 ="951266EC66A9F9853BA0D165DCB866DE";
        String md5Temp = md5+"\n"+Base64.encodeBase64String(key);   //不能为字符串
        System.out.println("md5Temp="+ md5Temp);

        String filepath="./";
        RSAPublicKey publicKey=RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath));
        byte[] md5Encrypt=RSAEncrypt.encrypt(publicKey,md5Temp.getBytes());
        String cipher=Base64.encodeBase64String(md5Encrypt);

//        byte[] cipherData=RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),md5Temp.getBytes());
//        String cipher=Base64.encodeBase64String(cipherData);
        System.out.println("cipher=" + cipher);

        //解密：
         //私钥解密过程
        byte[] res=RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)), Base64.decodeBase64(cipher));
        String restr=new String(res);
        System.out.println("原文："+cipher);
//        System.out.println("加密："+cipher);
        System.out.println("解密："+restr);
        System.out.println();

        //---------------------第二阶段
        String kekkk= "7HcrOV9DXSNvdj0Y7suWvQ==";
        System.out.println(showByteArray(Base64.decodeBase64(kekkk)));
//        Key k = toKey(key);
        Key k = toKey(Base64.decodeBase64(kekkk));

        String data ="AES数据";
        System.out.println("加密前数据: string:"+data);
        System.out.println("加密前数据: byte[]:"+showByteArray(data.getBytes()));
        System.out.println();
        byte[] encryptData = encrypt(data.getBytes(), k);
        System.out.println("加密后数据: byte[]:"+showByteArray(encryptData));
//        System.out.println("加密后数据: hexStr:"+Hex.encodeHexStr(encryptData));
        System.out.println();
        byte[] decryptData = decrypt(encryptData, k);
        System.out.println("解密后数据: byte[]:"+showByteArray(decryptData));
        System.out.println("解密后数据: string:"+new String(decryptData));

    }
}

rsa代码示例：

package com.autoyol.util.security.test;
import org.apache.commons.codec.binary.Base64;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

/**
 * 参考java加密和解密的艺术和相关资料
 */
public class RSAEncrypt {
    /**
     * 字节数据转字符串专用集合
     */
    private static final char[] HEX_CHAR = { '0', '1', '2', '3', '4', '5', '6',
        '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    /**
     * 随机生成密钥对
     */
    public static void genKeyPair(String filePath) {
        // KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
        KeyPairGenerator keyPairGen = null;
        try {
            keyPairGen = KeyPairGenerator.getInstance("RSA");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        // 初始化密钥对生成器，密钥大小为96-1024位
        keyPairGen.initialize(1024,new SecureRandom());
        // 生成一个密钥对，保存在keyPair中
        KeyPair keyPair = keyPairGen.generateKeyPair();
        // 得到私钥
        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
        // 得到公钥
        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
        try {
            // 得到公钥字符串
            String publicKeyString = Base64.encodeBase64String(publicKey.getEncoded());
            // 得到私钥字符串
            String privateKeyString = Base64.encodeBase64String(privateKey.getEncoded());
            // 将密钥对写入到文件
            FileWriter pubfw = new FileWriter(filePath + "/publicKey.keystore");
            FileWriter prifw = new FileWriter(filePath + "/privateKey.keystore");
            BufferedWriter pubbw = new BufferedWriter(pubfw);
            BufferedWriter pribw = new BufferedWriter(prifw);
            pubbw.write(publicKeyString);
            pribw.write(privateKeyString);
            pubbw.flush();
            pubbw.close();
            pubfw.close();
            pribw.flush();
            pribw.close();
            prifw.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 从文件中输入流中加载公钥
     *
     * @param in
     *            公钥输入流
     * @throws Exception
     *             加载公钥时产生的异常
     */
    public static String loadPublicKeyByFile(String path) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new FileReader(path
                + "/publicKey.keystore"));
            String readLine = null;
            StringBuilder sb = new StringBuilder();
            while ((readLine = br.readLine()) != null) {
                sb.append(readLine);
            }
            br.close();
            return sb.toString();
        } catch (IOException e) {
            throw new Exception("公钥数据流读取错误");
        } catch (NullPointerException e) {
            throw new Exception("公钥输入流为空");
        }
    }

    /**
     * 从字符串中加载公钥
     *
     * @param publicKeyStr
     *            公钥数据字符串
     * @throws Exception
     *             加载公钥时产生的异常
     */
    public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr)
        throws Exception {
        try {
            byte[] buffer = Base64.decodeBase64(publicKeyStr);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
            return (RSAPublicKey) keyFactory.generatePublic(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("公钥非法");
        } catch (NullPointerException e) {
            throw new Exception("公钥数据为空");
        }
    }

    /**
     * 从文件中加载私钥
     *
     * @param keyFileName
     *            私钥文件名
     * @return 是否成功
     * @throws Exception
     */
    public static String loadPrivateKeyByFile(String path) throws Exception {
        try {
            BufferedReader br = new BufferedReader(new FileReader(path
                + "/privateKey.keystore"));
            String readLine = null;
            StringBuilder sb = new StringBuilder();
            while ((readLine = br.readLine()) != null) {
                sb.append(readLine);
            }
            br.close();
            return sb.toString();
        } catch (IOException e) {
            throw new Exception("私钥数据读取错误");
        } catch (NullPointerException e) {
            throw new Exception("私钥输入流为空");
        }
    }

    public static RSAPrivateKey loadPrivateKeyByStr(String privateKeyStr)
        throws Exception {
        try {
            byte[] buffer = Base64.decodeBase64(privateKeyStr);
            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此算法");
        } catch (InvalidKeySpecException e) {
            throw new Exception("私钥非法");
        } catch (NullPointerException e) {
            throw new Exception("私钥数据为空");
        }
    }

    /**
     * 公钥加密过程
     *
     * @param publicKey
     *            公钥
     * @param plainTextData
     *            明文数据
     * @return
     * @throws Exception
     *             加密过程中的异常信息
     */
    public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData)
        throws Exception {
        if (publicKey == null) {
            throw new Exception("加密公钥为空, 请设置");
        }
        Cipher cipher = null;
        try {
            // 使用默认RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            byte[] output = cipher.doFinal(plainTextData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此加密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("加密公钥非法,请检查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("明文长度非法");
        } catch (BadPaddingException e) {
            throw new Exception("明文数据已损坏");
        }
    }

    /**
     * 私钥加密过程
     *
     * @param privateKey
     *            私钥
     * @param plainTextData
     *            明文数据
     * @return
     * @throws Exception
     *             加密过程中的异常信息
     */
    public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData)
        throws Exception {
        if (privateKey == null) {
            throw new Exception("加密私钥为空, 请设置");
        }
        Cipher cipher = null;
        try {
            // 使用默认RSA
            cipher = Cipher.getInstance("RSA");
            cipher.init(Cipher.ENCRYPT_MODE, privateKey);
            byte[] output = cipher.doFinal(plainTextData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此加密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("加密私钥非法,请检查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("明文长度非法");
        } catch (BadPaddingException e) {
            throw new Exception("明文数据已损坏");
        }
    }

    /**
     * 私钥解密过程
     *
     * @param privateKey
     *            私钥
     * @param cipherData
     *            密文数据
     * @return 明文
     * @throws Exception
     *             解密过程中的异常信息
     */
    public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData)
        throws Exception {
        if (privateKey == null) {
            throw new Exception("解密私钥为空, 请设置");
        }
        Cipher cipher = null;
        try {
            // 使用默认RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            byte[] output = cipher.doFinal(cipherData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此解密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("解密私钥非法,请检查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("密文长度非法");
        } catch (BadPaddingException e) {
            throw new Exception("密文数据已损坏");
        }
    }

    /**
     * 公钥解密过程
     *
     * @param publicKey
     *            公钥
     * @param cipherData
     *            密文数据
     * @return 明文
     * @throws Exception
     *             解密过程中的异常信息
     */
    public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData)
        throws Exception {
        if (publicKey == null) {
            throw new Exception("解密公钥为空, 请设置");
        }
        Cipher cipher = null;
        try {
            // 使用默认RSA
            cipher = Cipher.getInstance("RSA");
            // cipher= Cipher.getInstance("RSA", new BouncyCastleProvider());
            cipher.init(Cipher.DECRYPT_MODE, publicKey);
            byte[] output = cipher.doFinal(cipherData);
            return output;
        } catch (NoSuchAlgorithmException e) {
            throw new Exception("无此解密算法");
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
            return null;
        } catch (InvalidKeyException e) {
            throw new Exception("解密公钥非法,请检查");
        } catch (IllegalBlockSizeException e) {
            throw new Exception("密文长度非法");
        } catch (BadPaddingException e) {
            throw new Exception("密文数据已损坏");
        }
    }

    /**
     * 字节数据转十六进制字符串
     *
     * @param data
     *            输入数据
     * @return 十六进制内容
     */
    public static String byteArrayToString(byte[] data) {
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < data.length; i++) {
            // 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
            stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
            // 取出字节的低四位 作为索引得到相应的十六进制标识符
            stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
            if (i < data.length - 1) {
                stringBuilder.append(' ');
            }
        }
        return stringBuilder.toString();
    }

    public static void main(String[] args) throws Exception {
        String filepath="./";

//        RSAEncrypt.genKeyPair(filepath);

        /**
         * --------------公钥加密私钥解密过程-------------------
        原文：951266EC66A9F9853BA0D165DCB866DE
        加密：cUXcyZvimOd51S5XhdHQXCXhfqpwgjL83fLBVMgFSwYCC7ea6VUwGXtwEdpc7F0SrOMAWrlF51VX2MGd+ieLwGsUibdiAbDhm6Iry44HMdtWIt2hm98ierHOfDSWDVsUJz/JEwP1VjX4C7qc1lQEagalncou2pvpjk55x0eF1e4=
        解密：951266EC66A9F9853BA0D165DCB866DE
         */

        System.out.println("--------------公钥加密私钥解密过程-------------------");
//        String plainText="951266EC66A9F9853BA0D165DCB866DE";
//        //公钥加密过程
//        byte[] cipherData=RSAEncrypt.encrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)),plainText.getBytes());
//        String cipher=Base64.encodeBase64String(cipherData);
//        //私钥解密过程
//        byte[] res=RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)), Base64.decodeBase64(cipher));
//        String restr=new String(res);
//        System.out.println("原文："+plainText);
//        System.out.println("加密："+cipher);
//        System.out.println("解密："+restr);
//        System.out.println();

        String cipher="[B@dc08c3";
       //私钥解密过程
         byte[] res=RSAEncrypt.decrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)), Base64.decodeBase64(cipher));
         String restr=new String(res);
         System.out.println("原文："+cipher);
//         System.out.println("加密："+cipher);
         System.out.println("解密："+restr);
         System.out.println();

        /**
         * --------------私钥加密公钥解密过程-------------------
        原文：951266EC66A9F9853BA0D165DCB866DE
        加密：TWo3LW5CkaIgLeFIZVn9uFJxyCGSm90LSn72tNMJIsSg0HOcorXZsZmz1nG+jDHRysE6wxG3yAMjmHiemSyAhWDXDImLAhgag+kTkpsf7kx2o4EtY3ysKc2/OZwV3J/5OicFctql2oTkFNwf3UBfgdnHs+ucxRtj8P/ID6Klos0=
        解密：951266EC66A9F9853BA0D165DCB866DE
         */
        /*System.out.println("--------------私钥加密公钥解密过程-------------------");
        String plainText="951266EC66A9F9853BA0D165DCB866DE951266EC66A9F9853BA0D165DCB866DE";
        //私钥加密过程
        byte[] cipherData=RSAEncrypt.encrypt(RSAEncrypt.loadPrivateKeyByStr(RSAEncrypt.loadPrivateKeyByFile(filepath)),plainText.getBytes());
        String cipher=Base64.encodeBase64String(cipherData);
        //公钥解密过程
        byte[] res=RSAEncrypt.decrypt(RSAEncrypt.loadPublicKeyByStr(RSAEncrypt.loadPublicKeyByFile(filepath)), Base64.decodeBase64(cipher));
        String restr=new String(res);
        System.out.println("原文："+plainText);
        System.out.println("加密："+cipher);
        System.out.println("解密："+restr);
        System.out.println();*/

    }
}