PHP：openssl_encrypt结果32o字符串和16o输入字符串

Question

openssl_encrypt函数有问题。

在aes-128-cbc中，为什么函数返回32字节的字符串和16字节的字符串作为输入？

样品：

$binaryK0 = openssl_encrypt(hex2bin("00000000000000000000000000000000"),"AES-128-CBC", hex2bin("00112233445566778899AABBCCDDEEFF"),OPENSSL_RAW_DATA, hex2bin("00000000000000000000000000000000"));
echo "openssl_encrypt length:".strlen($binaryK0).'<br>';
$binaryK0 = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, hex2bin("00112233445566778899AABBCCDDEEFF"), hex2bin("00000000000000000000000000000000"), MCRYPT_MODE_CBC, hex2bin("00000000000000000000000000000000"));
echo "mcrypt_encrypt length:".strlen($binaryK0).'<br>';

结果： openssl_encrypt长度：32 mcrypt_encrypt长度：16

Answer 1

谢谢Topaco。

根据您的评论，我们调查了php openssl源代码。 我们找到“ OPENSSL_NO_PADDING”选项，现在可以正常使用了。

$binaryK0 = openssl_encrypt(hex2bin("00000000000000000000000000000000"),"AES-128-CBC", hex2bin("00112233445566778899AABBCCDDEEFF"),**OPENSSL_NO_PADDING**, hex2bin("00000000000000000000000000000000"));