所以我不需要評論3DES不安全和ECB不好等等,我們知道,這就是為什么我們試圖解密,以有一個更好的加密算法。

我在下面提供了使用mcrypt進行加密的代碼,以及我們試圖使用的1行代碼(openssl)對其進行解密。它總是返回false,我們想知道為什么。

我開始懷疑問題是mcrypt庫使用了8字節的IV,而openssl說它必須是0字節。

如果您能找到使用openssl解密這些值的方法,我們將不勝感激。

提前謝謝。

代碼如下:

$sEncryptionKey = 'aaaabbbbccccddddeeeeffff';

$sDataToEncrypt = 'Foo bar';

echo "Data to be Encrypted: $sDataToEncrypt\n";

$rMcrypt = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');

$iIvSize = mcrypt_enc_get_iv_size($rMcrypt); //This gives 8 bytes

$sInitializationVector = mcrypt_create_iv($iIvSize, MCRYPT_RAND);

$iKeySize = mcrypt_enc_get_key_size($rMcrypt);

if ($iKeySize != strlen($sEncryptionKey)) {

throw new Exception ('Invalid key length: '.$iKeySize);

}

mcrypt_generic_init($rMcrypt, $sEncryptionKey, $sInitializationVector);

$sEncryptedString = base64_encode(mcrypt_generic($rMcrypt, $sDataToEncrypt));

echo "Data Encrypted: $sEncryptedString\n";

$sDecryptedString = trim(mdecrypt_generic($rMcrypt, base64_decode($sEncryptedString)));

echo "Data Decrypted: $sDecryptedString\n";

mcrypt_generic_deinit($rMcrypt);

mcrypt_module_close($rMcrypt);

$sDecryptedString2 = openssl_decrypt(base64_decode($sEncryptedString), 'des-ede3', $sEncryptionKey, 0, ''); //this returns false.

echo "Data Decrypted (open SSL): $sDecryptedString2\n";

$sDecryptedString2 = openssl_decrypt(base64_decode($sEncryptedString), 'des-ede3', $sEncryptionKey, 0, $sInitializationVector); //Warning: openssl_decrypt(): IV passed is 8 bytes long which is longer than the 0 expected by selected cipher, truncating

?>

Data to be Encrypted: Foo bar

Data Encrypted: 5Mraf9swmaI=

Data Decrypted: Foo bar

Data Decrypted (open SSL):

Warning: openssl_decrypt(): IV passed is 8 bytes long which is longer than the 0 expected by selected cipher, truncating in /usr/local/www/appcluster01.ezmax.ca/pub/web/test/ian/test.cmd on line 31

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