JWT C# library
A C# class that can sign and validate JWT tokens, wrapped in a simple library with a couple of helper functions.
RSA Algorithm
To generate a compatible private key
openssl genrsa -out private.key 4096
To generate a compatible public key
openssl rsa -in private.key -outform PEM -pubout -out public.pem
Sign a JWT token
using Newtonsoft.Json;
JwtManager.RsJwt jwt = new JwtManager.RsJwt
{
KeySize = JwtManager.Helpers.KeySize.S256, // This can be also S384 or S512
PrivateKey = PrivateKey
};
string strToken = JsonConvert.SerializeObject(myToken);
string signedToken = jwt.Sign(strToken);In case of an error, an Exception will be thrown.
Validate a JWT token
using Newtonsoft.Json;
JwtManager.RsJwt jwt = new JwtManager.RsJwt
{
KeySize = JwtManager.Helpers.KeySize.S256, // This can be also S384 or S512
PublicKey = PublicKey
};
string payload = jwt.Validate(strToken);
var myToken = JsonConvert.DeserializeObject<JwtToken>(payload);In case of an error, an Exception will be thrown.
HMAC Algorithm
For this you need a secret in a string variable. Longer secret is better
Sign a JWT token
using Newtonsoft.Json;
string secret = "setyourverysecretkeyhere";
JwtManager.HsJwt jwt = new JwtManager.HsJwt
{
KeySize = JwtManager.Helpers.KeySize.S256, // This can be also S384 or S512
Secret = secret
};
string strToken = JsonConvert.SerializeObject(myToken);
string signedToken = jwt.Sign(strToken);In case of an error, an Exception will be thrown.
Validate a JWT token
using Newtonsoft.Json;
string secret = "setyourverysecretkeyhere";
JwtManager.HsJwt jwt = new JwtManager.HsJwt
{
KeySize = JwtManager.Helpers.KeySize.S256, // This can be also S384 or S512
Secret = secret
};
string payload = jwt.Validate(strToken);
var myToken = JsonConvert.DeserializeObject<JwtToken>(payload);In case of an error, an Exception will be thrown.
Other Info
The code has been tested both as a .NET and .NET Core library.
Check the JwtManagerTests project for more examples on how to use