AES ???? ?? PKCS7 ??
ECB ???? 128?? AES ???? ???? ???? ????? ?? PKCS7 ??? ??? ? ????. ???? ?? ??? ?????. ? ??? ??? ?? ?? ??? ???? ?????. ??? ? ???? ?? ??? ?? ??? ?? ?????.
PKCS7 ?? ??
?? ??? ???? PKCS7 ??? ?????:
- ???? ?? ??? ?????. ????(AES? ?? 16???)
- ?? ??? ??? ?? ??? ?? ???? ???? ??? ?? ??? ?? ?????.
- ?? ??? ???? ??? ?? ???? ?????. , ??? ???? ?????.
PHP? ? (Mcrypt)
<?php
$block_size = mcrypt_get_block_size('rijndael_128', 'ecb'); // Block size for AES
$padding_size = $block_size - (strlen($plaintext) % $block_size);
$plaintext .= str_repeat(chr($padding_size), $padding_size);
?>
PKCS7 ?? ??
?? ??? ????? PKCS7 ??? ?????:
- ??? ??? ?? ?? ??? plaintext.
- padding ??? ?? ???? ??? ??? ??? ?????.
- ?? ???? ??? padding_length ???? ?? ?? ??? ??? ?????.
- ?? ??? padding_length ???? ?????. ?? ???.
PHP(Mcrypt)? ?
<?php
$ciphertext = ...; // Encrypted ciphertext with PKCS7 padding
$key = ...; // Encryption key
$decrypted_plaintext = mcrypt_decrypt('rijndael_128', $key, $ciphertext, 'ecb');
$padding_length = ord($decrypted_plaintext[strlen($decrypted_plaintext) - 1]);
if (str_repeat(chr($padding_length), $padding_length) === substr($decrypted_plaintext, -1 * $padding_length)) {
$plaintext = substr($decrypted_plaintext, 0, -1 * $padding_length); // Remove padding
} else {
// Invalid padding
}
?>? ??? PKCS7 ??? AES ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!
? AI ??
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