Bash curl sign hmac

Question

I'm trying to use the Bittrex API. The only example provided is the following. I'm not even sure what language this is. I'm trying to replicate this in bash. Full API detail is located here https://bittrex.com/Home/Api

$apikey='xxx';
$apisecret='xxx';
$nonce=time();
$uri='https://bittrex.com/api/v1.1/market/getopenorders?apikey='.$apikey.'&nonce='.$nonce;
$sign=hash_hmac('sha512',$uri,$apisecret);
$ch = curl_init($uri);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('apisign:'.$sign));
$execResult = curl_exec($ch);
$obj = json_decode($execResult);

I have tried several things but here is the latest I tried.

#Bash
apikey="mykey"
secret="mysecret"
nonce=`date +%s`
uri="https://bittrex.com/api/v1.1/market/getopenorders?apikey=$apikey&nonce=$nonce"
apisig=`echo -n "$uri" | openssl dgst -sha512 -hmac "$secret"`

curl -sG https://bittrex.com/api/v1.1/market/getopenorders?nonce="$nonce"&apikey="$apikey"&apisig="$apisig"

I get "{"success":false,"message":"APIKEY_NOT_PROVIDED","result":null}"

Answer 1

What you're missing are:

• escaping & in query string
• passing digest as header rather than parameter

So the code that worked for me is:

#!/bin/bash

apikey="mykey"
secret="mysecret"
nonce=`date +%s`
uri="https://bittrex.com/api/v1.1/market/getopenorders?apikey=$apikey&nonce=$nonce"
apisig=`printf %s "$uri" | openssl dgst -sha512 -hmac "$secret"| sed 's/^.*= //'`

curl -sG $uri --header "apisign: $apisig"