无法使用 AES-256-CBC 中的 pgcrypto 解密，但 AES-128-CBC 可以 [英] Can't decrypt using pgcrypto from AES-256-CBC but AES-128-CBC is OK
问题描述
我在解密之前在 PHP 应用程序中加密的 pgcrypto 中的数据时遇到问题.
I have problem decrypting data in pgcrypto that was previously encrypted in PHP app.
我尝试了 3 种类型的加密:
1) mcrypt - RIJNDAEL 128 CBC
2) mcrypt - RIJNDAEL 256 CBC
3) openssl_encrypt - aes-256-cbc
I tried 3 types of encryption:
1) mcrypt - RIJNDAEL 128 CBC
2) mcrypt - RIJNDAEL 256 CBC
3) openssl_encrypt - aes-256-cbc
一切都在 PHP 中加密解密得很好，但在 pgcrypto 中我可以使用相同的密钥和 iv 解密 1) mcrypt - RIJNDAEL 128 CBC
everything is encrypted decrypted fine in PHP, but in pgcrypto I can decrypt using same key and iv only 1) mcrypt - RIJNDAEL 128 CBC
这是 PHP 部分的示例代码:
Here is example code for PHP part:
<?php
function d ($data, $key, $mode) {
$data = @base64_decode($data);
$pad = $mode == MCRYPT_RIJNDAEL_256 ? 32 : 16;
$iv = mb_substr($data, 0, $pad, "8bit");
$data = mb_substr($data, $pad, mb_strlen($data, "8bit"), "8bit");
if ($data === null || $data === "") {
return $data;
}
if ($mode == MCRYPT_RIJNDAEL_128 OR $mode == MCRYPT_RIJNDAEL_256) {
$data = mcrypt_decrypt($mode, $key, $data, MCRYPT_MODE_CBC, $iv);
} else {
$data = openssl_decrypt($data, "aes-256-cbc", $key, 0, $iv);
}
if ($data === false) {
throw new Exception("Unable to decrypt data");
}
$padding = ord($data[mb_strlen($data, "8bit") - 1]);
$data = mb_substr($data, 0, mb_strlen($data, "8bit") - $padding, "8bit");
return $data;
}
function e ($data, $key, $mode) {
$pad = $mode == MCRYPT_RIJNDAEL_256 ? 32 : 16;
$iv = openssl_random_pseudo_bytes($pad);
$padding = 16 - (strlen($data) % $pad);
$data .= str_repeat(chr($padding), $padding);
if ($mode == MCRYPT_RIJNDAEL_128 OR $mode == MCRYPT_RIJNDAEL_256) {
$data = mcrypt_encrypt($mode, $key, $data, MCRYPT_MODE_CBC, $iv);
} else {
$data = openssl_encrypt($data, "aes-256-cbc", $key, 0, $iv );
}
if ($data === false) {
throw new Exception("Unable to encrypt data");
}
return base64_encode($iv . $data);
}
$mode1 = MCRYPT_RIJNDAEL_128;
$key1 = "67pma7BQL01cqb6Nlil2T1436lLXv8Ln";
$key2 = "85f2669023b98a62d1312af75994ddf1";
$mode2 = MCRYPT_RIJNDAEL_256;
$key3 = "85f2669023b98a62d1312af75994ddf1";
$mode3 = "aes-256-cbc";
$data = "test";
$e1 = e($data, $key1, $mode1);
$e2 = e($data, $key2, $mode2);
$e3 = e($data, $key3, $mode3);
$d1 = d($e1, $key1, $mode1); //
$d2 = d($e2, $key2, $mode2); //
$d3 = d($e3, $key3, $mode3); //
//for ($i=1; $i < 4; $i++) {
// ${"e" . $i} = e($data, ${"key" . $i}, ${"mode" . $i});
//
// ${"d" . $i} = d(${"e" . $i}, ${"key" . $i}, ${"mode" . $i});
//}
用于编码的结果和数据:
1) mcrypt - RIJNDAEL 128 CBC
- key = "67pma7BQL01cqb6Nlil2T1436lLXv8Ln"
- 初始化向量 base64 = "q5gXIfW6maT4zx4tgJQImg=="
- 加密字符串 base64 ="q5gXIfW6maT4zx4tgJQImtwJgEVK66mTcRPdilkEiHY="
- 解密字符串 base64 = "dGVzdA=="
2) mcrypt - RIJNDAEL 256 CBC
- key = "85f2669023b98a62d1312af75994ddf1"
- 初始化向量 base64 = "2EmtyH++cQA5X5mmtY+vpl5FkVwELS9ExrYnFjGGco0="
- 加密字符串 base64 = "2EmtyH++cQA5X5mmtY+vpl5FkVwELS9ExrYnFjGGco3B29CC5DpfWs1YAfh8WuY9f0/6OPC1B4sidSV5TojJ1g=="
- 解密字符串 base64 ="dGVzdAwMDAwMDAwMDAwMDAAAAAAAAAAAAAAAAAAAAAAA="
3) openssl_encrypt - aes-256-cbc
- key = "85f2669023b98a62d1312af75994ddf1"
- 初始化向量 base64 = "tOi+xXZf6MyPDpQzPZAI6Q=="
- 加密字符串 base64 = "tOi+xXZf6MyPDpQzPZAI6XJQYmwyNUVzKzdaVnNickc5dEg5MUd1anpBYlpLeW9SQjhpZ29yQzRpWFk9"
- 解密字符串 base64="dGVzdA=="
这里是我如何尝试使用相同的密钥和 IV 在 Postgres 中解密这些数据.
Here how I am trying to decrypt this data in Postgres using same Keys and IV.
SELECT
-- mcrypt aes 128
decrypt_iv(
decode('q5gXIfW6maT4zx4tgJQImtwJgEVK66mTcRPdilkEiHY=', 'base64'),
'67pma7BQL01cqb6Nlil2T1436lLXv8Ln',
decode('q5gXIfW6maT4zx4tgJQImg==', 'base64'),
'aes-cbc'
),
-- mcrypt aes 256
decrypt_iv(
decode('2EmtyH++cQA5X5mmtY+vpl5FkVwELS9ExrYnFjGGco3B29CC5DpfWs1YAfh8WuY9f0/6OPC1B4sidSV5TojJ1g==', 'base64'),
'85f2669023b98a62d1312af75994ddf1',
decode('2EmtyH++cQA5X5mmtY+vpl5FkVwELS9ExrYnFjGGco0=', 'base64'),
'aes-cbc'
),
-- -- openssl aes 256
-- decrypt_iv(
-- decode('tOi+xXZf6MyPDpQzPZAI6XJQYmwyNUVzKzdaVnNickc5dEg5MUd1anpBYlpLeW9SQjhpZ29yQzRpWFk9', 'base64'),
-- '85f2669023b98a62d1312af75994ddf1',
-- decode('tOi+xXZf6MyPDpQzPZAI6Q==', 'base64'),
-- 'aes-cbc'
-- ),
-- pgcrypto same values as mcrypt aes 128 encrypt then decrypt
decrypt_iv(
encrypt_iv(
'test',
'67pma7BQL01cqb6Nlil2T1436lLXv8Ln',
decode('q5gXIfW6maT4zx4tgJQImg==', 'base64'),
'aes-cbc'),
'67pma7BQL01cqb6Nlil2T1436lLXv8Ln',
decode('q5gXIfW6maT4zx4tgJQImg==', 'base64'),
'aes-cbc'
)
如您所见，在 PHP 中所有 3 个解密都正常.在 Postgres 中只有首先 (mcrypt aes128cbc) 解密 OK - 前 16 个字节仍然是 IV，但我可以删除它们并转换为文本.另外两个(mcrypte AES256CBC 和 openssl256cbc)甚至看起来都没有被解密.我用 openssl256cbc 注释了块，因为它给了我[39000] 错误:decrypt_iv 错误:数据不是块大小的倍数"错误.
As you see all 3 decrypted OK in PHP. In Postgres only first (mcrypt aes128cbc) decrypted OK - first 16 bytes still are IV, but I could remove them and convert to text. Two others (mcrypte AES256CBC and openssl256cbc) are not even looking like they were decrypted. I commented block with openssl256cbc since it gives me "[39000] ERROR: decrypt_iv error: Data not a multiple of block size" error.
任何帮助将不胜感激.
推荐答案
MCRYPT_RIJNDAEL_256 不是 AES-256.它是块大小为 256 的 Rijndael 密码(因此出现错误).AES 是 Rijndael 密码的子集，使用 128 位的块大小和 128、192 和 256 位的密钥.这也反映在 IV 大小上.
MCRYPT_RIJNDAEL_256 isn't AES-256. It's the Rijndael cipher with a block size of 256 (hence the error). AES is a subset of the Rijndael cipher using block size of 128 bits and key sizes of 128, 192 and 256 bits. This is also reflected in the IV size.
要创建 AES-256 加密密文，您可以使用 MCRYPT_RIJNDAEL_128 和正确的密钥大小(256 位是 32 字节)._128 后缀表示要使用的块大小；您仍然可以将它与 128、192 或 256 位的任何有效密钥大小一起使用.
To create an AES-256 encrypted ciphertext you can use MCRYPT_RIJNDAEL_128 with the correct key size (256 bits is 32 bytes). The _128 postfix indicates the block size to be used; you can still use it with any valid key size of 128, 192 or 256 bit.
请注意 mcrypt - 特别是底层的 C 库 - 不再维护.最好使用 openssl 或更高版本的加密库.
Beware that mcrypt - especially the underlying C-library - is not maintained anymore. You're better off using the openssl or later crypto libraries.
mcrypt 和 OpenSSL 包装器也很乐意允许无效的密钥大小，只会警告您 - 如果您很幸运.这当然与任何定义良好的 AES 库都不兼容.
The mcrypt and OpenSSL wrappers will also happily allow invalid key sizes, only warning you - if you're lucky. That's of course not compatible with about any well defined AES library.
这篇关于无法使用 AES-256-CBC 中的 pgcrypto 解密，但 AES-128-CBC 可以的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
