<?php

function sign($secretId, $timestamp, $nonce, $privateKey): string
{
    $sign_string = $secretId . "," . $timestamp . "," . $nonce;
    openssl_sign($sign_string, $signature, $privateKey, OPENSSL_ALGO_SHA256);
    return base64_encode($signature);
}

function verify($signature, $json, $publicKey): bool|int
{
    $verification = openssl_verify($json, base64_decode($signature), $publicKey, "sha256WithRSAEncryption");
    return $verification;
}

function testSign(): void
{
    $timestamp = time();
    $secretId = "your_secret_id";
    $nonce = rand(100, 999999);
    $privateKey = file_get_contents('./my_private_key.pem');

    $signature = sign($secretId, $timestamp, $nonce, $privateKey);
    echo $signature;
}

function testVerify(): void
{
    try {
        require "./mockService.php";
        $mockResponse = mockService();
    } catch (Exception) {
        $mockResponse = array(
            "json" => "{\"5c8213b9bc807806aab0a574\":{\"speechs\":[{\"name\":\"13.mp3\",\"label\":1,\"review\":false,\"details\":[{\"startTime\":5,\"endTime\":10,\"label\":1,\"rate\":0.9640088528394699},{\"startTime\":35,\"endTime\":40,\"label\":1,\"rate\":0.7449841499328613}]},{\"name\":\"za8gq-zb1kt.wma\",\"label\":0,\"review\":false,\"details\":[]}]},\"code\":0,\"message\":\"success\",\"nonce\":\"0.01627771095362096\",\"timestamp\":1552391372490}",
            "signature" => "signature_from_tupu_service"
        );
    }

    $tupu_public_key = file_get_contents('./tupu_public_key.pem');

    $verification = verify($mockResponse["signature"], $mockResponse["json"], $tupu_public_key);
    echo $verification;
}

testSign();
// eg :f6RX3dJFUf/zd3EaM68df+u9b8pSJzKJUcQsJGlNWP4iOf7w3V0plNO1ub4ZkRtr4CkDHl2WzjNhpIpa5jHMQ5ewv1K9vYb08dnRKOmEFSqDnka0wYGtR7Spf23wf9xwEdJQPg5cLJG8ze3Hr2i5zwx+hf4dzR+zF8eumEBGuko=

echo "\n";

testVerify();
// eg: 0 , 1 or -1
// 0: incorrect
// 1: correct
// -1: error

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