首页 / 算法 / php对称加密算法的例子_PHP教程

php对称加密算法的例子_PHP教程

内容导读

互联网集市收集整理的这篇技术教程文章主要介绍了php对称加密算法的例子_PHP教程，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含7742字，纯文字阅读大概需要12分钟。

内容图文

分享下php对称加密算法的实现代码。

KEY 是之前定义的常量

Mcrypt::<span encrypt();
Mcrypt::<span decrypt();

<span defined('ROOT') or <span exit('Access Denied'<span );
<span class<span  Mcrypt{

<span public <span static <span function encrypt(<span $code<span ){
<span return <span base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, <span md5(<span KEY), <span $code, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB),<span  MCRYPT_RAND)));
}

<span public <span static <span function decrypt(<span $code<span ){
<span return mcrypt_decrypt(MCRYPT_RIJNDAEL_256, <span md5(<span KEY), <span base64_decode(<span $code), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB),<span  MCRYPT_RAND));
}
}

<span 常用对称加密算法（DES/AES）类

xcrypt.php

<span /*<span * 
* 常用对称加密算法类 
* 支持密钥：64/128/256 bit（字节长度8/16/32） 
* 支持算法：DES/AES（根据密钥长度自动匹配使用：DES:64bit AES:128/256bit） 
* 支持模式：CBC/ECB/OFB/CFB 
* 密文编码：base64字符串/十六进制字符串/二进制字符串流 
* 填充方式: PKCS5Padding（DES） 
* 
* @author: linvo 
* @version: 1.0.0 
* @date: 2013/1/10 
<span */ 
<span class<span  Xcrypt{

<span private <span $mcrypt<span ; 
<span private <span $key<span ; 
<span private <span $mode<span ; 
<span private <span $iv<span ; 
<span private <span $blocksize<span ;

<span /*<span * 
* 构造函数 
* 
* @param string 密钥 
* @param string 模式 
* @param string 向量（"off":不使用 / "auto":自动 / 其他:指定值，长度同密钥） 
<span */ 
<span public <span function __construct(<span $key, <span $mode = 'cbc', <span $iv = "off"<span ){ 
<span switch (<span strlen(<span $key<span )){ 
<span case 8: 
<span $this->mcrypt =<span  MCRYPT_DES; 
<span break<span ; 
<span case 16: 
<span $this->mcrypt =<span  MCRYPT_RIJNDAEL_128; 
<span break<span ; 
<span case 32: 
<span $this->mcrypt =<span  MCRYPT_RIJNDAEL_256; 
<span break<span ; 
<span default: 
<span die("Key size must be 8/16/32"<span ); 
} www.jbxue.<span com

<span $this-><span key = <span $key<span ;

<span switch (<span strtolower(<span $mode<span )){ 
<span case 'ofb': 
<span $this->mode =<span  MCRYPT_MODE_OFB; 
<span if (<span $iv == 'off') <span die('OFB must give a IV'); <span //<span OFB必须有向量 
<span break<span ; 
<span case 'cfb': 
<span $this->mode =<span  MCRYPT_MODE_CFB; 
<span if (<span $iv == 'off') <span die('CFB must give a IV'); <span //<span CFB必须有向量 
<span break<span ; 
<span case 'ecb': 
<span $this->mode =<span  MCRYPT_MODE_ECB; 
<span $iv = 'off'; <span //<span ECB不需要向量 
<span break<span ; 
<span case 'cbc': 
<span default: 
<span $this->mode =<span  MCRYPT_MODE_CBC; 
}

<span switch (<span strtolower(<span $iv<span )){ 
<span case "off": 
<span $this->iv = <span null<span ; 
<span break<span ; 
<span case "auto": 
<span $source = <span PHP_OS=='WINNT' ? MCRYPT_RAND :<span  MCRYPT_DEV_RANDOM; 
<span $this->iv = mcrypt_create_iv(mcrypt_get_block_size(<span $this->mcrypt, <span $this->mode), <span $source<span ); 
<span break<span ; 
<span default: 
<span $this->iv = <span $iv<span ; 
} 
}

<span /*<span * 
* 获取向量值 
* @param string 向量值编码（base64/hex/bin） 
* @return string 向量值 
<span */  www.jbxue.<span com
<span public <span function getIV(<span $code = 'base64'<span ){ 
<span switch (<span $code<span ){ 
<span case 'base64': 
<span $ret = <span base64_encode(<span $this-><span iv); 
<span break<span ; 
<span case 'hex': 
<span $ret = <span bin2hex(<span $this-><span iv); 
<span break<span ; 
<span case 'bin': 
<span default: 
<span $ret = <span $this-><span iv; 
} 
<span return <span $ret<span ; 
} 

<span /*<span * 
* 加密 
* @param string 明文 
* @param string 密文编码（base64/hex/bin） 
* @return string 密文 
<span */ 
<span public <span function encrypt(<span $str, <span $code = 'base64'<span ){ 
<span if (<span $this->mcrypt == MCRYPT_DES) <span $str = <span $this->_pkcs5Pad(<span $str<span );

<span if (<span isset(<span $this-><span iv)) { 
<span $result = mcrypt_encrypt(<span $this->mcrypt, <span $this-><span key, <span $str, <span $this->mode, <span $this-><span iv); 
} <span else<span  { 
@<span $result = mcrypt_encrypt(<span $this->mcrypt, <span $this-><span key, <span $str, <span $this-><span mode); 
}

<span switch (<span $code<span ){ 
<span case 'base64': 
<span $ret = <span base64_encode(<span $result<span ); 
<span break<span ; 
<span case 'hex': 
<span $ret = <span bin2hex(<span $result<span ); 
<span break<span ; 
<span case 'bin': 
<span default: 
<span $ret = <span $result<span ; 
}

<span return <span $ret<span ;

}

<span /*<span * 
* 解密 
* @param string 密文 
* @param string 密文编码（base64/hex/bin） 
* @return string 明文 
<span */ 
<span public <span function decrypt(<span $str, <span $code = "base64"<span ){ 
<span $ret = <span false<span ;

<span switch (<span $code<span ){ 
<span case 'base64': 
<span $str = <span base64_decode(<span $str<span ); 
<span break<span ; 
<span case 'hex': 
<span $str = <span $this->_hex2bin(<span $str<span ); 
<span break<span ; 
<span case 'bin': 
<span default:<span  
}

<span if (<span $str !== <span false<span ){ 
<span if (<span isset(<span $this-><span iv)) { 
<span $ret = mcrypt_decrypt(<span $this->mcrypt, <span $this-><span key, <span $str, <span $this->mode, <span $this-><span iv); 
} <span else<span  { 
@<span $ret = mcrypt_decrypt(<span $this->mcrypt, <span $this-><span key, <span $str, <span $this-><span mode); 
} 
<span if (<span $this->mcrypt == MCRYPT_DES) <span $ret = <span $this->_pkcs5Unpad(<span $ret<span ); 
<span $ret = <span trim(<span $ret<span ); 
}

<span return <span $ret<span ; 
}

<span private <span function _pkcs5Pad(<span $text<span ){ 
<span $this->blocksize = mcrypt_get_block_size(<span $this->mcrypt, <span $this-><span mode); 
<span $pad = <span $this->blocksize - (<span strlen(<span $text) % <span $this-><span blocksize); 
<span return <span $text . <span str_repeat(<span chr(<span $pad), <span $pad<span ); 
}

<span private <span function _pkcs5Unpad(<span $text<span ){ 
<span $pad = <span ord(<span $text{<span strlen(<span $text) - 1<span }); 
<span if (<span $pad > <span strlen(<span $text)) <span return <span false<span ; 
<span if (<span strspn(<span $text, <span chr(<span $pad), <span strlen(<span $text) - <span $pad) != <span $pad) <span return <span false<span ; 
<span $ret = <span substr(<span $text, 0, -1 * <span $pad<span ); 
<span return <span $ret<span ; 
}

<span private <span function _hex2bin(<span $hex = <span false<span ){ 
<span $ret = <span $hex !== <span false && <span preg_match('/^[0-9a-fA-F]+$/i', <span $hex) ? <span pack("H*", <span $hex) : <span false<span ; 
<span return <span $ret<span ; 
} 
}

<span 上面php加密算法类的使用方法

<?<span php 
<span header('Content-Type:text/html;Charset=utf-8;'<span );

<span include "xcrypt.php"<span ;

<span echo '
'<span ; 
<span $a = <span isset(<span $_GET['a']) ? <span $_GET['a'] : '测试123'<span ;

<span //<span 密钥 
<span $key = '12345678123456781234567812345678'; <span //<span 256 bit 
<span $key = '1234567812345678'; <span //<span 128 bit 
<span $key = '12345678'; <span //<span 64 bit

//设置模式和IV 
<span $m = <span new Xcrypt(<span $key, 'cbc', 'auto'<span );

<span //<span 获取向量值 
<span echo '向量：'<span ; 
<span var_dump(<span $m-><span getIV());

<span //<span 加密 
<span $b = <span $m->encrypt(<span $a, 'base64'<span ); 
<span //<span 解密 
<span $c = <span $m->decrypt(<span $b, 'base64'<span );

<span echo '加密后：'<span ; 
<span var_dump(<span $b<span ); 
<span echo '解密后：'<span ; 
<span var_dump(<span $c<span ); 
<span echo '
';

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/767256.htmlTechArticle分享下php对称加密算法的实现代码。 KEY 是之前定义的常量 Mcrypt:: :: ('ROOT') or ('Access Denied' encrypt( (mcrypt_encrypt(MCRYPT_RIJNDAEL_256, ( ), , MCRYPT_M...

内容总结

以上是互联网集市为您收集整理的php对称加密算法的例子_PHP教程全部内容，希望文章能够帮你解决php对称加密算法的例子_PHP教程所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。

内容备注

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。

内容手机端

扫描二维码推送至手机访问。

本文链接：https://qyyshop.com/info/182195.html

来源：【匿名】