Creating a Sign

Akash-pay API's are protected behind a sign based verification using the HMAC sha256 Algorithm.These are essential for any finance platform as they provide a way to check the integrity of information transmitted over or stored in an unreliable medium.

Script For Generation Sign

Following is JS code for Generating a sign

import crypto from 'crypto';


export class HmacUtil {
  static hmac256(key:string, msg:string) {
    const mac = crypto.createHmac('sha256', key);
    const data = mac.update(msg).digest('hex').toLowerCase();
    return data;
  }

  static getStringToSign(body: Record<string, any> ,nonce:string,timestamp:string , reqMethod:string, requestURI:string) {

    const treeMap = new Map(Object.entries(body).sort());
    let s2s = '';

    for (const [k, v] of treeMap) {
      if (!k || typeof v === 'object') {
        continue;
      }
      if (v !== null && v !== undefined && String(v)) {
        s2s += ${k}=${v}&;
      }
    }

    const bodyString =  s2s.slice(0, -1);
    const CotentMd5 = crypto.createHash('md5').update(bodyString).digest('hex');
    const stringToSign = reqMethod + '\n' + CotentMd5 + '\n'  + requestURI + '\n' + timestamp + '\n' + nonce ;
    return stringToSign
  }
}

const nonce = '123456';
const timestamp = Date.now();
console.log(timestamp)
const reqMethod = 'POST';
const requestURI = 'http://localhost:8080/api/external/transfer-to-cosmos'; //request endpoint
const str = HmacUtil.getStringToSign({
    "email":"[e-mail]" //user email
 }, nonce, timestamp.toString(), reqMethod, requestURI) //call this method for generating the sign to send in the Header
const sign = HmacUtil.hmac256("<secret-key>",str)
const appId = "<app-id>"