使用mcrypt加/解密

使用 mcrypt 加/解密

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function make_seed() {

list($usec, $sec) = explode(' ', microtime());

return(float) $sec +((float) $usec * 100000);

}

srand(make_seed());

/* 开启加密算法/ */

$td = mcrypt_module_open('twofish', '', 'ecb', '');

/* 建立 IV，并检测 key 的长度 */

$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

$ks = mcrypt_enc_get_key_size($td);

/* 生成 key */

$key = substr(md5('very secret key'), 0, $ks);

/* 初始化加密程序 */

mcrypt_generic_init($td, $key, $iv);

/* 加密, $encrypted 保存的是已经加密后的数据 */

print $encrypted = mcrypt_generic($td, 'This is very important data');

/* 检测加密句柄 */

mcrypt_generic_deinit($td);

/* 初始化加密模块，用以解密 */

mcrypt_generic_init($td, $key, $iv);

/* 解密 */

$decrypted = mdecrypt_generic($td, $encrypted);

/* 检测解密句柄，并关闭模块 */

mcrypt_generic_deinit($td);

mcrypt_module_close($td);

/* 显示原始字符串 */

echo trim($decrypted)."\n";

函数封装后的～

因为建立 IV 的时候，source 用了 MCRYPT_RAND

所以 srand();

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<?php

function make_seed() {

list($usec, $sec) = explode(' ', microtime());

return(float) $sec +((float) $usec * 100000);

}

function twofish_encode($dat, $key)

{

srand(make_seed());

// Twofish 算法， ECB 模式

$td = mcrypt_module_open('twofish', '', 'ecb', '');

// If u use MCRYPT_RAND, make sure to invoke strand() first.

$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

$ks = mcrypt_enc_get_key_size($td);

$gen_key = substr(md5($key), 0, $ks);

mcrypt_generic_init($td, $gen_key, $iv);

$encrypted = mcrypt_generic($td, $dat);

mcrypt_module_close($td);

return $encrypted;

}

function twofish_decode($dat, $key)

{

srand(make_seed());

// Twofish algorithm, ECB Mode

$td = mcrypt_module_open('twofish', '', 'ecb', '');

$iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);

$ks = mcrypt_enc_get_key_size($td);

$gen_key = substr(md5($key), 0, $ks);

mcrypt_generic_init($td, $gen_key, $iv);

$decrypted = mdecrypt_generic($td, $dat);

// Clear all buffer needed by the encryption

// Close the module

mcrypt_generic_deinit($td);

mcrypt_module_close($td);

return trim($decrypted);

}

// Some examples

$raw = 'It is confidential data.';

$key = '1314521-7576798-5468181';

// 加密数据

print $encode_data = twofish_encode($raw, $key);

// 解密数据

print $decode_data = twofish_decode($encode_data, $key);

?>