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php对称加密算法(DES/AES)类代码

时间:2021-07-01 10:21:17 帮助过:9人阅读

  1. /**
  2. * 常用对称加密算法类
  3. * 支持密钥:64/128/256 bit(字节长度8/16/32)
  4. * 支持算法:DES/AES(根据密钥长度自动匹配使用:DES:64bit AES:128/256bit)
  5. * 支持模式:CBC/ECB/OFB/CFB
  6. * 密文编码:base64字符串/十六进制字符串/二进制字符串流
  7. * 填充方式: PKCS5Padding(DES)
  8. *
  9. * @author: linvo
  10. * @version: 1.0.0
  11. * @date: 2013/1/10
  12. */
  13. class Xcrypt{
  14. private $mcrypt;
  15. private $key;
  16. private $mode;
  17. private $iv;
  18. private $blocksize;
  19. /**
  20. * 构造函数
  21. *
  22. * @param string 密钥
  23. * @param string 模式
  24. * @param string 向量("off":不使用 / "auto":自动 / 其他:指定值,长度同密钥)
  25. */
  26. public function __construct($key, $mode = 'cbc', $iv = "off"){
  27. switch (strlen($key)){
  28. case 8:
  29. $this->mcrypt = MCRYPT_DES;
  30. break;
  31. case 16:
  32. $this->mcrypt = MCRYPT_RIJNDAEL_128;
  33. break;
  34. case 32:
  35. $this->mcrypt = MCRYPT_RIJNDAEL_256;
  36. break;
  37. default:
  38. die("Key size must be 8/16/32");
  39. }
  40. $this->key = $key;
  41. switch (strtolower($mode)){
  42. case 'ofb':
  43. $this->mode = MCRYPT_MODE_OFB;
  44. if ($iv == 'off') die('OFB must give a IV'); //OFB必须有向量
  45. break;
  46. case 'cfb':
  47. $this->mode = MCRYPT_MODE_CFB;
  48. if ($iv == 'off') die('CFB must give a IV'); //CFB必须有向量
  49. break;
  50. case 'ecb':
  51. $this->mode = MCRYPT_MODE_ECB;
  52. $iv = 'off'; //ECB不需要向量
  53. break;
  54. case 'cbc':
  55. default:
  56. $this->mode = MCRYPT_MODE_CBC;
  57. }
  58. switch (strtolower($iv)){
  59. case "off":
  60. $this->iv = null;
  61. break;
  62. case "auto":
  63. $source = PHP_OS=='WINNT' ? MCRYPT_RAND : MCRYPT_DEV_RANDOM;
  64. $this->iv = mcrypt_create_iv(mcrypt_get_block_size($this->mcrypt, $this->mode), $source);
  65. break;
  66. default:
  67. $this->iv = $iv;
  68. }
  69. }
  70. /**
  71. * 获取向量值
  72. * @param string 向量值编码(base64/hex/bin)
  73. * @return string 向量值
  74. */
  75. public function getIV($code = 'base64'){
  76. switch ($code){
  77. case 'base64':
  78. $ret = base64_encode($this->iv);
  79. break;
  80. case 'hex':
  81. $ret = bin2hex($this->iv);
  82. break;
  83. case 'bin':
  84. default:
  85. $ret = $this->iv;
  86. }
  87. return $ret;
  88. }
  89. /**
  90. * 加密
  91. * @param string 明文
  92. * @param string 密文编码(base64/hex/bin)
  93. * @return string 密文
  94. */
  95. public function encrypt($str, $code = 'base64'){
  96. if ($this->mcrypt == MCRYPT_DES) $str = $this->_pkcs5Pad($str);
  97. if (isset($this->iv)) {
  98. $result = mcrypt_encrypt($this->mcrypt, $this->key, $str, $this->mode, $this->iv);
  99. } else {
  100. @$result = mcrypt_encrypt($this->mcrypt, $this->key, $str, $this->mode);
  101. }
  102. switch ($code){
  103. case 'base64':
  104. $ret = base64_encode($result);
  105. break;
  106. case 'hex':
  107. $ret = bin2hex($result);
  108. break;
  109. case 'bin':
  110. default:
  111. $ret = $result;
  112. }
  113. return $ret;
  114. }
  115. /**
  116. * 解密
  117. * @param string 密文
  118. * @param string 密文编码(base64/hex/bin)
  119. * @return string 明文
  120. */
  121. public function decrypt($str, $code = "base64"){
  122. $ret = false;
  123. switch ($code){
  124. case 'base64':
  125. $str = base64_decode($str);
  126. break;
  127. case 'hex':
  128. $str = $this->_hex2bin($str);
  129. break;
  130. case 'bin':
  131. default:
  132. }
  133. if ($str !== false){
  134. if (isset($this->iv)) {
  135. $ret = mcrypt_decrypt($this->mcrypt, $this->key, $str, $this->mode, $this->iv);
  136. } else {
  137. @$ret = mcrypt_decrypt($this->mcrypt, $this->key, $str, $this->mode);
  138. }
  139. if ($this->mcrypt == MCRYPT_DES) $ret = $this->_pkcs5Unpad($ret);
  140. }
  141. return $ret;
  142. }
  143. private function _pkcs5Pad($text){
  144. $this->blocksize = mcrypt_get_block_size($this->mcrypt, $this->mode);
  145. $pad = $this->blocksize - (strlen($text) % $this->blocksize);
  146. return $text . str_repeat(chr($pad), $pad);
  147. }
  148. private function _pkcs5Unpad($text){
  149. $pad = ord($text{strlen($text) - 1});
  150. if ($pad > strlen($text)) return false;
  151. if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
  152. $ret = substr($text, 0, -1 * $pad);
  153. return $ret;
  154. }
  155. private function _hex2bin($hex = false){
  156. $ret = $hex !== false && preg_match('/^[0-9a-fA-F]+$/i', $hex) ? pack("H*", $hex) : false;
  157. return $ret;
  158. }
  159. }
使用示例:
  1. header('Content-Type:text/html;Charset=utf-8;');
  2. include "xcrypt.php";
  3. echo '
    '; 
  4. //////////////////////////////////////
  5. $a = isset($_GET['a']) ? $_GET['a'] : '测试123';
  6. //密钥
  7. $key = '12345678123456781234567812345678'; //256 bit
  8. $key = '1234567812345678'; //128 bit
  9. $key = '12345678'; //64 bit
  10. //设置模式和IV
  11. $m = new Xcrypt($key, 'cbc', 'auto');
  12. //获取向量值
  13. echo '向量:';
  14. var_dump($m->getIV());
  15. //加密
  16. $b = $m->encrypt($a, 'base64');
  17. //解密
  18. $c = $m->decrypt($b, 'base64');
  19. echo '加密后:';
  20. var_dump($b);
  21. echo '解密后:';
  22. var_dump($c);
  23. /////////////////////////////////////////
  24. echo '
  25. ';


php, DES, AES

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