使用 phpseclib 进行 RSA 和 AES 混合加密/解密失败

Question

我想使用非对称密钥加密和解密字符串。

由于字符串可以更大，我决定尝试这样的混合解决方案：

<?php

use phpseclib\Crypt\RSA;

use phpseclib\Crypt\Rijndael;

use phpseclib\Crypt\Random;

function generateKeys()

{

    $rsa = new RSA();

    return $rsa->createKey();

}

function encrypt($plaintext, $asym_key, $key_length = 150)

{

    $rsa = new RSA();

    $rij = new Rijndael();

    $sym_key = Random::string($key_length);

    $rij->setKey($sym_key);

    $ciphertext = $rij->encrypt($plaintext);

    $ciphertext = base64_encode($ciphertext);

    $rsa->loadKey($asym_key);

    $sym_key = $rsa->encrypt($sym_key);

    $sym_key = base64_encode($sym_key);

    $len     = strlen($sym_key);

    $len

         = dechex($len);

    $len = str_pad($len, 3, '0', STR_PAD_LEFT);

    $message = $len.$sym_key.$ciphertext;

    return $message;

}

function decrypt($message, $asym_key)

{

    $rsa = new RSA();

    $rij = new Rijndael();

    $len     = substr($message, 0, 3);

    $len     = hexdec($len);

    $sym_key = substr($message, 0, $len);

    $message    = substr($message, 3);

    $ciphertext = substr($message, $len);

    $ciphertext = base64_decode($ciphertext);

    $rsa->loadKey($asym_key);

    $sym_key = base64_decode($sym_key);

    $sym_key = $rsa->decrypt($sym_key);

    // Decrypt the message

    $rij->setKey($sym_key);

    $plaintext = $rij->decrypt($ciphertext);

    return $plaintext;

}

$keys      = generateKeys();

$encrypted = encrypt('test', $keys['publickey']);

print_r($encrypted);

$decrypted = decrypt($encrypted, $keys['privatekey']);

print_r($decrypted);

Answer 1

您没有正确分解消息decrypt：$sym_key&nbsp;=&nbsp;substr($message,&nbsp;0,&nbsp;$len);这包括长度。你可能想写$sym_key&nbsp;=&nbsp;substr($message,&nbsp;3,&nbsp;$len);