PreHash | This is our implementation for the paper

i have problem to sign api for okex ,in document of okex:

The OK-ACCESS-SIGN header is generated as follows:

Create a prehash string of timestamp + method + requestPath + body (where + represents String concatenation). Prepare the SecretKey. Sign the prehash string with the SecretKey using the HMAC SHA256. Encode the signature in the Base64 format. Example: sign=CryptoJS.enc.Base64.stringify(CryptoJS.HmacSHA256(timestamp + 'GET' + '/users/self/verify', SecretKey))

The timestamp value is the same as the OK-ACCESS-TIMESTAMP header with millisecond format of ISO, e.g. 2020-12-08T09:08:57.715Z.

The request method should be in UPPERCASE: e.g. GET and POST.

The requestPath is the path of requesting an endpoint.

Example: /api/v5/account/balance

The body refers to the String of the request body. It can be omitted if there is no request body (frequently the case for GET requests). method i made fo sign is:

Problem: I cannot properly encode signature, according to https://docs.cloud.coinbase.com/exchange/docs/messages . No matter what I'm doing, I'm getting "Invalid signature" rejection.

I'm using QuickFix FIX engine, and my code is written in C++. Signature calculation code provided below. b64_encode and hmac_sha256 are based on OpenSSL functions and were verified in another parts of application, so they are expected to be working correctly (unless Coinbase actually expects another kind of encryption).

I'm trying to make a post request in Twilio functions to process a charge with the USAePay gateway API but my code seems to be tripping somewhere. Any insight is appreciated. I think it may be the callback() function being in the wrong place.

I also get a a warning that buffer is depreciated, how can I work around that?

Here is my code:

What I wanted to do is call the Coinbase sandbox API to get all accounts for a profile.
I am following the official documentation https://docs.cloud.coinbase.com/exchange/reference/exchangerestapi_getaccounts
But keep getting this error
Client request(https://api-public.sandbox.exchange.coinbase.com/accounts) invalid: 401 Unauthorized. Text: "{"message":"invalid signature"}"

Am I missing something?

I am trying to make a script that starts with a secret, then hashes it, and hashes that, written in Javascript w/Node. I need to repeat that process 5 million times. The basis for the code is simple but the execution is what's slowing me down. This is what I have so far.

I am trying to send an authentificated message over an API at iconomi.com. I am used to sign message when dealing with other exchange API, but can't be authentificated with this specific one.

I read the official documentation for authentification:

You generate the ICN-SIGN header by creating a sha512 HMAC using the base64-decoded secret key on the prehash string timestamp + method + requestPath + body (where + represents string concatenation) and base64-encode the output, where:

the timestamp value is the same as the ICN-TIMESTAMP header. the body is the request body string or omitted if there is no request body (typically for GET requests). method must always be in upper case

Example: base64_encode(HMAC_SHA512(secret_key, timestamp + upper_case(method) + requestPath + body))

I found also a java client example on the official github, please see bellow signature generation in java :

I'm developing a java wrapper for the coinbase v2 API because I can't find any library that works the way I want : in a "fluent" way, using vavr data types & apiKey authentication.

First of all I developed the whole public data wrapper of the coinbase API, and it works fine. It allow me to call for Coinbase currencies, ExchangeRates, prices...

Now I want to call secured endpoints like https://api.coinbase.com/v2/user. Si I followed specs defined in https://developers.coinbase.com/docs/wallet/api-key-authentication

So far nothing crazy, I simply follow guidelines, even if there are not based on java but on python, ruby and nodejs it doesn't look really hard... But when I execute a call to an endpoint, for exemple : https://api.coinbase.com/v2/user I get this response :

I'm triying to Encrypt string with C# and decrypt it using Angular crypto-js library but it's giving me different output. I tried different c# aes encryption implementations but crypto-js library can't decrypt the encrypted data in c#. Thank you for any help.

Here is my code

Program.cs

I want to verify a signature of some payload, given a public ECDSA key, and I know beforehand that the signature is correct. I want to use the cryptography python library, but the problem being, I can't make the verification work and always get a InvalidSignature exception, even though the signature should be correct.

Here the code snippet I'm currently using. The public key is base64 encoded and in DER format (so no ---BEGIN PUBLIC KEY --- etc.) and the signature is base64 encoded as well. The message is some JSON data as a string, with no spaces.