import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

public static String Sha256HMAC(String key, byte[] data) throws Exception {
    Mac sha256_HMAC = Mac.getInstance("HmacSHA256");
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "HmacSHA256");
    sha256_HMAC.init(keySpec);
    byte[] hash = sha256_HMAC.doFinal(data);

    byte[] hexChars = new byte[hash.length * 2];
    for ( int j = 0; j < hash.length; j++ ) {
        byte[] s = String.format("%02x", hash[j] & 0xFF).getBytes();
        hexChars[j * 2] = s[0];
        hexChars[j * 2 + 1] = s[1];
    }
    return new String(hexChars);
}

public static String Sign(String ver, String ak, String sk, byte[] data) throws Exception {
    int expiration = 1800;  //  有效时间, 单位是秒，根据业务的实际情况调整
    long timestamp = System.currentTimeMillis() / 1000L;
    String signKeyInfo = String.format("%s/%s/%d/%d", ver, ak, timestamp, expiration);
    String signKey = Sha256HMAC(sk, signKeyInfo.getBytes());
    String signResult = Sha256HMAC(signKey, data);
    return String.format("%s/%s", signKeyInfo, signResult);
}

<?php
function sha256HMAC($key, $data) {
    // 使用 HMAC-SHA256 算法生成哈希
    $hash = hash_hmac('sha256', $data, $key, true);
    // 将哈希转换为十六进制字符串
    $hexChars = '';
    foreach (str_split($hash) as $byte) {
        $hexChars .= sprintf("%02x", ord($byte));
    }
    return $hexChars;
}
function sign($ver, $ak, $sk, $data) {
    $expiration = 1800; // 有效时间，单位是秒，根据业务实际情况调整
    $timestamp = time(); // 获取当前时间戳（单位：秒）
    // 生成 signKeyInfo
    $signKeyInfo = sprintf("%s/%s/%d/%d", $ver, $ak, $timestamp, $expiration);
    // 使用 sk 和 signKeyInfo 生成 signKey
    $signKey = sha256HMAC($sk, $signKeyInfo);
    // 使用 signKey 和 data 生成签名结果
    $signResult = sha256HMAC($signKey, $data);
    // 返回完整签名信息
    return sprintf("%s/%s", $signKeyInfo, $signResult);
}
// 示例调用
$ver = "2022-02-10";
$ak = "ak";
$sk = "sk";
// 示例数据结构
$body = [
    'A' => 10,
    'B' => 'demo'
];
// 将 body 数据编码为 JSON
$payload = json_encode($body);
$signature = sign($ver, $ak, $sk, $payload);
echo $signature;