[removed] Equivalent of PHP's hash_hmac() with RAW BINARY output?

Question

I am connecting to the Amazon Product Advertising API, and to sign my request I need to base64-encode the raw binary output of an HMAC-SHA256 hash.

In t

Answer 1

php code

echo base64_encode(hash_hmac('SHA1', 'shanghai', '0', true).'beijing');

php output

xvBv49PpaYvXAIfy3iOSDWNQj89iZWlqaW5n

node code

var crypto = require('crypto');
var buf1 = crypto.createHmac("sha1", "0").update("shanghai").digest();
var buf2 = Buffer.from('beijing');
console.log(Buffer.concat([buf1, buf2]).toString('base64'));    

node output

xvBv49PpaYvXAIfy3iOSDWNQj89iZWlqaW5n