java实现AES算法加密解密

package com.cz.test1;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 AESUtil {    /**     * 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;    }    /**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;    }        //测试    public static void main(String[] args) {        String content = "test";        String password = "12345678";        //加密        System.out.println("加密前：" + content);        byte[] encryptResult = encrypt(content, password);        String encryptResultStr = parseByte2HexStr(encryptResult);        System.out.println("加密后：" + encryptResultStr);        //解密        byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);        byte[] decryptResult = decrypt(decryptFrom,password);        System.out.println("解密后：" + new String(decryptResult));}}

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运行结果：

加密前：test

加密后：73C58BAFE578C59366D8C995CD0B9D6D

解密后：test