SSL [SOLVED]: Translating SSL command to PHP

SSL [SOLVED]: Translating SSL command to PHP

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  • #36776

    Anonymous

    QuestionQuestion

    I have an SSL command which signs a string with a given key:
    openssl dgst -sha256 -hex -sign key.pem data.txt. I’d like to know how I can translate it to a PHP function. The equivalent in PHP should be something like this:
    openssl_sign($data, $signature, $key, OPENSSL_ALGO_SHA256). However, the unix command outputs the signature in hex, while the I don’t really get what the PHP command outputs.

    #36777

    Anonymous

    Accepted AnswerAnswer

    This will produce the same hex representation as the openssl command:

    $signature = "";
    $data = file_get_contents("data.txt");
    $key = file_get_contents("key.pem");
    openssl_sign($data, $signature, $key, OPENSSL_ALGO_SHA256);
    echo bin2hex($signature);
    

    Essentially, the php version produces the binary bytes, so in my code above, I just use the bin2hex function to output it in the same format you are used to in the openssl command.

    Source: https://stackoverflow.com/questions/47979348/translating-ssl-command-to-php
    Author: Nick
    Creative Commons License
    This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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