java AES加密解密

//第二种和第一种类似 加密方式由EBC 改成 CBC  增加了向量  每太明白可能就是增加复杂度吧  

//这个是写借口的时候 我用java 别人用的是别的语言 AES加密对应不上 别人提供的 如果没有汉字就对上了 ,有了汉字加密后的16进制也是不一样的 
//想到的办法是用  URLEncorder.encode("汉字")  进行转码  或者这里面提供的把汉字转换为二进制




import java.io.UnsupportedEncodingException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
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.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class AESUtil2 {

    /*
     * 算法/模式/填充 16字节加密后数据长度 不满16字节加密后长度
     * AES/CBC/NoPadding 16 不支持
     * AES/CBC/PKCS5Padding 32 16
     * AES/CBC/ISO10126Padding 32 16
     * AES/CFB/NoPadding 16 原始数据长度
     * AES/CFB/PKCS5Padding 32 16
     * AES/CFB/ISO10126Padding 32 16
     * AES/ECB/NoPadding 16 不支持
     * AES/ECB/PKCS5Padding 32 16
     * AES/ECB/ISO10126Padding 32 16
     * AES/OFB/NoPadding 16 原始数据长度
     * AES/OFB/PKCS5Padding 32 16
     * AES/OFB/ISO10126Padding 32 16
     * AES/PCBC/NoPadding 16 不支持
     * AES/PCBC/PKCS5Padding 32 16
     * AES/PCBC/ISO10126Padding 32 16
     *
     * 注：
     * 1、JCE中AES支持五中模式：CBC，CFB，ECB，OFB，PCBC；支持三种填充：NoPadding，PKCS5Padding，ISO10126Padding。 不带模式和填充来获取AES算法的时候，其默认使用ECB/PKCS5Padding。
     * 2、Java支持的密钥长度：keysize must be equal to 128, 192 or 256
     * 3、Java默认限制使用大于128的密钥加密（解密不受限制），报错信息：java.security.InvalidKeyException: Illegal key size or default parameters
     * 4、下载并安装JCE Policy文件即可突破128密钥长度的限制：覆盖jre\lib\security目录下local_policy.jar、US_export_policy.jar文件即可
     * 5、除ECB外，需提供初始向量（IV），如：Cipher.init(opmode, key, new IvParameterSpec(iv)), 且IV length: must be 16 bytes long
     */
    private static String ALGORITHM = "AES";
    private static int keySize = 128;
    private static final String TRANSFORMATION = "AES/CBC/PKCS5Padding";

    public static SecretKeySpec bulidKey(String password) throws NoSuchAlgorithmException {
        KeyGenerator kgen = KeyGenerator.getInstance(ALGORITHM);
        SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG"); 
        secureRandom.setSeed(password.getBytes());
        kgen.init(keySize, secureRandom);
        SecretKey secretKey = kgen.generateKey();
        byte[] enCodeFormat = secretKey.getEncoded();
        SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
        return key;
    }

    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     */
    public static byte[] encrypt(String content, String password) {
        try {
            SecretKeySpec key = bulidKey(password);
            String iv = "jssjbyfkzzxsyjcs";//初始化向量参数，AES 为16bytes. DES 为8bytes.
            IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());     //增加了向量 这就是上面一个不用的地方
            Cipher cipher = Cipher.getInstance(TRANSFORMATION);// 创建密码器
            cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);// 初始化
            byte[] byteContent = content.getBytes("gbk");
            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();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     */
    public static String encrypt2Str(String content, String password) {
            return parseByte2HexStr(encrypt(content,password)); // 加密
    }

    /**
     * 解密
     *
     * @param content
     *            待解密内容
     * @param password
     *            解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            SecretKeySpec key = bulidKey(password);
            String iv = "jssjbyfkzzxsyjcs";//初始化向量参数，AES 为16bytes. DES 为8bytes.
            IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
            Cipher cipher = Cipher.getInstance(TRANSFORMATION);// 创建密码器
            cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);// 初始化
            byte[] result = cipher.doFinal(content);
            return result; // 解密
        } 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 (InvalidAlgorithmParameterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 解密
     *
     * @param content
     *            待解密内容
     * @param password
     *            解密密钥
     * @return
     */
    public static String decryptStr(String content, String password) {
        byte[] decryptFrom = parseHexStr2Byte(content);
        byte[] decryptResult = decrypt(decryptFrom, password);
        String result = "--";
        try {
            result = new String(decryptResult,"gbk");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 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();
    }

    /**
     * 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 void main(String[] args) {
        String content = "山东省济南市槐荫区中大办事处裕华里";
        String password = "bc29c2f94e0e0355c346892a45bc2b42";
        // 加密971436EC53EED78C0A942FCA7900E1E7F13527CB29268B9B52DA3A6C7F804C1825AF87A0B8F550DE09055D42BED07EB7:长度:96
        System.out.println("加密前：" + content);
        byte[] encryptResult = encrypt(content, password);
        String encryptResultStr = parseByte2HexStr(encryptResult);
        System.out.println("加密后：" + encryptResultStr+":长度:"+encryptResultStr.length());
        // 解密
        String decryptResult = decryptStr(encryptResultStr, password);
        System.out.println("解密后：" + decryptResult);
    }
}

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
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 AESTest {

    /**
     * 加密
     *
     * @param content
     *            需要加密的内容
     * @param password
     *            加密密码
     * @return
     */
    public static byte[] encrypt(String content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.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 = content.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;
    }

    /**
     * 解密
     *
     * @param content
     *            待解密内容
     * @param password
     *            解密密钥
     * @return
     */
    public static byte[] decrypt(byte[] content, String password) {
        try {
            KeyGenerator kgen = KeyGenerator.getInstance("AES");
            kgen.init(128, new SecureRandom(password.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
            byte[] result = cipher.doFinal(content);
            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();
        }
        return null;
    }

    public static void main(String args[]) {

        String content = "te大st";
        String password = "12345678";
        // 加密
        System.out.println("加密前：" + content);
        byte[] encryptResult = encrypt(content, password);
        // 解密
        byte[] decryptResult = decrypt(encryptResult, password);
        System.out.println("解密后：" + new String(decryptResult));

    }

}