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    Mcrypt 関数

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    User Contributed Notes 24 notes

    up
    3
    rolf at winmutt dot com
    18 years ago
    mysql AES_ENCRYPT() compatibly function for PHP :

    <?php
    function mysql_aes_encrypt($val,$ky) {
    $mode=MCRYPT_MODE_ECB;
    $enc=MCRYPT_RIJNDAEL_128;
    $val=str_pad($val, (16*(floor(strlen($val) / 16)+(strlen($val) % 16==0?2:1))), chr(16-(strlen($val) % 16)));
    return     mcrypt_encrypt($enc, $ky, $val, $mode, mcrypt_create_iv( mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM));
    }
    ?>

    Please note that if the strlen($ky)>16 then this function will not be compatible.
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    3
    groundzero at zuavra dot net
    20 years ago
    If you've ever compiled PHP from source (any version) you may be familiar with the [in]famous MCRYPT_BLOWFISH_128 compilation error that appears when you attempt to compile --with-mcrypt. It occurs often on Debian but not only there. The problem: during compilation, the PHP configure script always assumes that libmcrypt has been built in conjunction with libltdl. Whenever that is not the case, PHP compilation will fail later saying certain headers (such as the above blowfish example) are missing from mcrypt.h (which is misleading, they're not supposed to be there nor looked after if libltdl was properly involved). Solution: make sure your libmcrypt was linked against libltdl before you even start configuring PHP. You can check by running 'ldd lybmcrypt.so' and verifying that libltdl appears in the output. libltdl can be found in libltld[3][-dev] on Debian or in libtool-libs on Red Hat.
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    4
    manyagain
    15 years ago
    if you don't have mcrypt installed, try phpseclib - http://phpseclib.sourceforge.net

    includes pure-php implementations of des, 3des, rc4, aes, and rijndael. uses mcrypt if it's available and a pure-php implementation otherwise. it also has the distinction of having the fastest existent pure-php aes implementation as per section 3.5.5. "Speed Comparisons" of the documentation.
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    5
    duerra_NOT_THIS_ at pushitlive dot net
    18 years ago
    For those of you that need to use PKCS#5 padding, the mcrypt API's for PHP do not support it. However, you can DIY using the following:

    <?php

    function encrypt_something($input)
    {
    $size = mcrypt_get_block_size('des', 'ecb');
    $input = pkcs5_pad($input, $size);

    $key = 'YOUR SECRET KEY HERE';
    $td = mcrypt_module_open('des', '', 'ecb', '');
    $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
    mcrypt_generic_init($td, $key, $iv);
    $data = mcrypt_generic($td, $input);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    $data = base64_encode($data);
    return     $data;
    }

    function     pkcs5_pad ($text, $blocksize)
    {
    $pad = $blocksize - (strlen($text) % $blocksize);
    return     $text . str_repeat(chr($pad), $pad);
    }

    function     pkcs5_unpad($text)
    {
    $pad = ord($text{strlen($text)-1});
    if (    $pad > strlen($text)) return false;
    if (    strspn($text, chr($pad), strlen($text) - $pad) != $pad) return false;
    return     substr($text, 0, -1 * $pad);
    }
    ?>
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    2
    triptripon at gmail dot com
    18 years ago
    Regarding storing the result on a postgres DB that uses Unicode (follow up to a post below).
    You don't need to change the DB's encoding to ASCII.
    Simply use BASE64 to encode the result, it's perfectly safe.
    use base64_decode before you decrypt.
    -- Tomer Levinboim
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    2
    herowekker at hotmail dot com
    21 years ago
    mcrypt_ecb with base64_decode gave some problems, i found out that it had to be chopped to work:

    <?php
    chop    (mcrypt_ecb(MCRYPT_BLOWFISH,$key,base64_decode($input),MCRYPT_DECRYPT));
    ?>
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    1
    Kevin
    16 years ago
    Solved Problem:

    when compiling php --with-mcrypt, phpinfo() says, that mcrypt ist enabled, but
    "Supported ciphers none" and
    "Supported modes none"

    In order to get mcrypt to work in php, you have to configure and compile the libmcrypt source package with the following options:
    ./configure --disable-posix-threads --enable-dynamic-loading
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    1
    simms
    21 years ago
    DEBIAN users: avoid mcrypt installation headaches.
    to add mcrypt support to an existing php installation, get root and run

    apt-get install php4-mcrypt

    restart your webserver, and voila.
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    1
    pawelNOSPAM at rsc dot pl
    23 years ago
    If you compiled mcrypt and php without problem, but phpinfo() shows there are no supported ciphers and modes, try to change mode to 755 on libdirs (/usr/local/libmcrypt, /usr/local/libcrypt).
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    1
    patrickdk at patrickdk dot com
    14 years ago
    This works completely with mysql aes, even long keys.

    <?php
    function mysql_aes_decrypt($val,$ky)
    {
    $key="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
    for(    $a=0;$a<strlen($ky);$a++)
    $key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a]));
    $mode = MCRYPT_MODE_ECB;
    $enc = MCRYPT_RIJNDAEL_128;
    $dec = @mcrypt_decrypt($enc, $key, $val, $mode, @mcrypt_create_iv( @mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM ) );
    return     rtrim($dec,(( ord(substr($dec,strlen($dec)-1,1))>=0 and ord(substr($dec, strlen($dec)-1,1))<=16)? chr(ord( substr($dec,strlen($dec)-1,1))):null));
    }

    function     mysql_aes_encrypt($val,$ky)
    {
    $key="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
    for(    $a=0;$a<strlen($ky);$a++)
    $key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a]));
    $mode=MCRYPT_MODE_ECB;
    $enc=MCRYPT_RIJNDAEL_128;
    $val=str_pad($val, (16*(floor(strlen($val) / 16)+(strlen($val) % 16==0?2:1))), chr(16-(strlen($val) % 16)));
    return     mcrypt_encrypt($enc, $key, $val, $mode, mcrypt_create_iv( mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM));
    }
    ?>