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  • AES加密解密

    package cn.test;

    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 AES {
    /**
    * 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;
    }
    /**
    * 加密
    * 这种加密方式有两种限制,密钥必须是16位的,待加密内容的长度必须是16的倍数,如果不是16的倍数,就会出如下异常
    * @param content 需要加密的内容
    * @param password 加密密码
    * @return
    */
    public static byte[] encrypt2(String content, String password) {
    try {
    SecretKeySpec key = new SecretKeySpec(password.getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
    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;
    }

    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[] decryptResult = decrypt(encryptResult,password);
    byte[] decryptFrom = parseHexStr2Byte(encryptResultStr);
    byte[] decryptResult1 = decrypt(decryptFrom,password);
    System.out.println("解密后:" + new String(decryptResult));
    System.out.println("解密后:" + new String(decryptResult1));
    }

    }

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  • 原文地址:https://www.cnblogs.com/zhaoblog/p/7521554.html
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