Conversion from buffer to string gives different results in c# and Nodejs

Question

I'm trying to convert this function from C# to node but I'm getting different results when I try to convert a buffer to a string.

string str = "34924979";
System.Security.Cryptography.SHA512 sha = new System.Security.Cryptography.SHA512Managed();
byte[] ba = System.Text.Encoding.ASCII.GetBytes(str);
byte[] data= sha.ComputeHash(ba);
Console.WriteLine(System.Text.Encoding.ASCII.GetString(data));


>> `?????gV)????∟?Z?s??v$We-??N?"?w????0??\i♠G???

that's what i'm trying to do.

const crypto = require('crypto')

const str = '34924979';
const sha = crypto.createHash('sha512').update(str).digest('utf8');
const hash = sha.toString('utf-8').replace(/\uFFFD/g, '?');
console.log(hash);

>> `????gV)????∟?Z?v$We-??N?"?w????0?\i♠Gߕ?

Well for one... you use ASCII in C# and UTF-8 in Node.js...

k.tten
– k.tten

2023-01-05 15:05:21 +00:00
Commented Jan 5, 2023 at 15:05 — k.tten
– k.tten, Commented Jan 5, 2023 at 15:05

YungDeiza · Accepted Answer · 2023-01-05 16:43:57Z

2

You're using different encodings in C# and JS.

Try changing the JS code to the following:

const sha = crypto.createHash('sha512').update(str).digest('ascii');
const hash = sha.toString('ascii');

edited Jan 5, 2023 at 16:43

answered Jan 5, 2023 at 15:12

YungDeiza

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3 Comments

Vitor Bersani Over a year ago

I tried this and got the same result.

YungDeiza Over a year ago

Needed to update the digest method parameter on the line above as well - updated answer

Vitor Bersani Over a year ago

The ascii parameter in digest solved my issue. Thanks!

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