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// 安装 MCrypt 包
$ wget http://downloads.sourceforge.net/project/mcrypt/Libmcrypt/2.5.8/libmcrypt-2.5.8.tar.gz?use_mirror=cdnetworks-kr-2
$ tar -xzf libmcrypt-2.5.8.tar.gz
$ cd libmcrypt-2.5.8
$ ./configure --prefix=/home/app/libmcrypt-2.5.8
$ make
$ sudo make install
// 编译 php
$ wget http://cn.php.net/get/php-5.2.13.tar.gz/from/this/mirror
$ tar -xzf php-5.2.13.tar.gz
$ cd php-5.2.13/ext/mcrypt/
$ /home/php-5.2.0/bin/phpize
$ ./configure --with-php-config=/home/php-5.2.0/bin/php-config --with-mcrypt=/home/app/libmcrypt-2.5.8/
$ sudo mkdir -p /home/php5/lib/php/extensions/no-debug-non-zts-20060613
$ sudo cp -p modules/mcrypt.so /home/php5/lib/php/extensions/no-debug-non-zts-20060613/

测试：

dl("mcrypt.so");
$string = "test@abc.com";
$stuff="String to enc/enc/dec/dec =,=,";
$key="XiTo74dOO09N48YeUmuvbL0E";
$iv = mcrypt_create_iv (mcrypt_get_block_size (MCRYPT_TripleDES, MCRYPT_MODE_CBC), MCRYPT_DEV_RANDOM);

$iv64=base64_encode($iv);
echo "iv:".base64_encode($iv);
echo "
\n";

$key=base64_decode("U42/zc3r6zC2Ok11BqO+lA==");
$iv=base64_decode("xTXaC2FQEGWOVBqPIipt1A==");
//$enc=mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_ENCRYPT, $iv);
//MCRYPT_RIJNDAEL_128
$enc=mcrypt_cbc (MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_ENCRYPT, $iv);
$ret=base64_encode($enc);

echo "encrypt:".$ret;
echo "
\n";
$string=$ret;
$string = trim(base64_decode($string));
//$dec = mcrypt_cbc (MCRYPT_TripleDES, $key, $string, MCRYPT_DECRYPT, $iv);
$dec = mcrypt_cbc (MCRYPT_RIJNDAEL_128, $key, $string, MCRYPT_DECRYPT, $iv);

echo "decrypt:".$dec;