openssl enc的php实现

Question

使用 guacamole-auth-json，编码 php 客户端实现。

我需要能够使用 aes-128-cbc 密码加密 hmac sha256 散列 json。我有相同的哈希输入数据，但未能实现加密。

bash 中的工作 guacamole-auth-json 示例

#!/bin/bash -e

##
## Encryption/signing key.
##
SECRET_KEY="$1"

##
## The filename of the JSON data being signed and encrypted.
##
JSON_FILENAME="$2"
##

## A null (all zeroes) IV.
##
NULL_IV="00000000000000000000000000000000"

##
## Signs the contents of the given file using the given key. The signature is
## created using HMAC/SHA-256, and is output in binary form to STDOUT, followed
## by the raw contents of the file.
##
## @param KEY
##     The key to use to sign the contents of the given file with HMAC/SHA-256.
##
## @param FILENAME
##     The filename of the file to sign.
##
sign() {

    KEY="$1"
    FILENAME="$2"

    #
    # Write out signature
    #

    openssl dgst                                \
        -sha256 -mac HMAC -macopt hexkey:"$KEY" \
        -binary "$FILENAME"

    #
    # Write out file contents
    #

    cat "$FILENAME"

}

##
## Encrypts all data received through STDIN using the provided key. Data is
## encrypted using 128-bit AES in CBC mode (with a null IV). The encrypted
## result is printed to STDOUT encoded with base64.
##
## @param KEY
##     The key to encrypt STDIN with, as a 16-byte (32-digit) hexadecimal
##     value.
##
encrypt() {

    KEY="$1"

    #
    # Encrypt STDIN
    #

    openssl enc -aes-128-cbc -K "$KEY" -iv "$NULL_IV" -nosalt -a

}

#
# Sign and encrypt file using secret key
#
sign "$SECRET_KEY" "$JSON_FILENAME" | encrypt "$SECRET_KEY"

我的其他数据生成 php 实现

$auth_json = "{\n";
$auth_json = $auth_json . "    \"username\" : \"\",\n";
$auth_json = $auth_json . "    \"expires\" : \"1607500000000\",\n";
$auth_json = $auth_json . "    \"connections\" : {\n";
$auth_json = $auth_json . "        \"Trading server 001\" : {\n";
$auth_json = $auth_json . "            \"protocol\" : \"" . get_post_meta( $post->ID,'trading_server_protocol', true ) . "\",\n";
$auth_json = $auth_json . "            \"parameters\" : {\n";
$auth_json = $auth_json . "                \"hostname\" : \"" . get_post_meta( $post->ID,'trading_server_hostname', true ) . "\",\n";
$auth_json = $auth_json . "                \"port\" : \"" . get_post_meta( $post->ID,'trading_server_port', true ) . "\",\n";
$auth_json = $auth_json . "                \"password\" : \"" . get_post_meta( $post->ID,'trading_server_password', true ) . "\",\n";
$auth_json = $auth_json . "                \"read-only\" : \"" . get_post_meta( $post->ID,'trading_server_readonly', true ) . "\"\n";
$auth_json = $auth_json . "            }\n";
$auth_json = $auth_json . "        }\n";
$auth_json = $auth_json . "    }\n";
$auth_json = $auth_json . "}";
            
$encrypt_key = "12345678901234567890123456789012";
$NULL_IV="00000000000000000000000000000000";
// HMAC Hex to byte
$secret     = hex2bin($encrypt_key);
$auth_json_hash = hash_hmac("sha256", $auth_json, $secret);
$auth_json_hash_bin = hash_hmac("sha256", $auth_json, $secret, true);
            
$cipher = "AES-128-CBC";
$data = $auth_json_hash_bin . $auth_json;
$auth_json_encrypted_raw = openssl_encrypt( $data, $cipher, $encrypt_key, $options = OPENSSL_RAW_DATA, $NULL_IV );
$auth_json_encrypted_base64 = base64_encode( $auth_json_encrypted_raw );

我有相同的哈希值，但无法调用 openssl_encrypt 函数，结果与使用 bash 示例产生的结果相同。

两者之间可能存在一些问题

openssl enc -aes-128-cbc -K "$KEY" -iv "$NULL_IV" -nosalt -a

和

openssl_encrypt($data, $cipher, $encrypt_key, $options = OPENSSL_RAW_DATA, $NULL_IV)

我明白，我需要在 php 中对结果进行 base64 编码（-a 开关），并且需要一些解决方案（-nosalt 开关）。

Answer 1

问题在于 php 中的十六进制参数（encrypt_key，NULL_IV）。

正确的代码应该是

$encrypt_key = "12345678901234567890123456789012";
$NULL_IV="00000000000000000000000000000000";
..
$auth_json_encrypted_raw = openssl_encrypt( $data, $cipher, hex2bin($encrypt_key), $options = OPENSSL_RAW_DATA, hex2bin($NULL_IV) );