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Hi,
I am experiencing this problem also. When I run mcrypt_decrypt it causes apache to crash. However, mcrypt_encrypt is working fine.

I have Mcrypt module loaded as a dynamic module on apache. I am using Windows XP professional, apache 1.3 and php 4.3.4 . The mcrypt dll library is a "libmcrypt + php 4.3.x on windows".

The following is the example code I used, which causes apache to crash.

If you any questions or suggestions please do not hesitate to contact me. Thanks in advance.

Cheers,



Daniel

==================================
Example code
================================

example6_encrypt();

function example6_encrypt(){
	$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "This is a very secret key";
    $text = "Meet me at 11 o'clock behind the monument.";
    //echo strlen($text) . "\n";

    $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
    //echo strlen($crypttext) . "\n";
	echo "<p>encrypted string: <b>$crypttext</b></p>";

	example6_decrypt($crypttext);
}

/*
string mcrypt_decrypt ( string cipher, string key, string data, string mode [, string iv])
*/
function example6_decrypt($text){
	$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "This is a very secret key";

	$decrypt_text = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);

	echo "<p>decrypted string: <b>$decrypt_text</b></p>";
}

Windows 2003 Server SP1
PHP 4.3.2
this line crashes Apache/1.3.24

$bar = mcrypt_ecb(MCRYPT_RIJNDAEL_128 , 'foo', $bar, MCRYPT_DECRYPT);