Decode JWT Token (Boost) #248
Description
What's your question?
How to decode JWT token (HS256) with Boost traits?
Additional Context
Hello.
I have a token generated by https://jwt.io but I have a problem - Exception: Invalid input: not within alphabet.
How to fix it?
Encoded:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
Header:
{
"alg": "HS256",
"typ": "JWT"
}
Payload:
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}
VERIFY SIGNATURE:
HMACSHA256(
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-256-bit-secret
)
Code:
#include <boost/json/src.hpp>
#include <jwt-cpp/traits/boost-json/traits.h>
using traits = jwt::traits::boost_json;
using claim = jwt::basic_claim<traits>;
void jwt_token(const std::string& token)
{
const auto decoded = jwt::decode<traits>(token);
std::cout << "decoded token: " << decoded.get_algorithm() << std::endl;
}
Error log:
token: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
Exception: Invalid input: not within alphabet