gateio-rs 0.1.0

Comprehensive Rust SDK for Gate.io cryptocurrency exchange API with sync and async support
Documentation 
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use hmac::digest::Digest;
use hmac::{Hmac, Mac};
use sha2::Sha512;
use std::error::Error;

pub fn sign_hmac(
    method: &str,
    path: &str,
    query: &str,
    payload: &str,
    timestamp: &str,
    key: &str,
) -> Result<String, Box<dyn Error>> {
    // 1. SHA512(payload)
    let hashed_payload = hex::encode(Sha512::digest(payload.as_bytes()));

    // 2. Build canonical string
    let s = format!(
        "{}\n{}\n{}\n{}\n{}",
        method, path, query, hashed_payload, timestamp
    );

    // 3. HMAC-SHA512(secret, s)
    let mut mac = Hmac::<Sha512>::new_from_slice(key.to_string().as_bytes())?;
    mac.update(s.to_string().as_bytes());
    let signature_bytes = mac.finalize().into_bytes();
    Ok(hex::encode(signature_bytes))
}