Authentication with JWT Bearer doesn't work the debug says the problem is inside the GetToken() function

Question

I've a code using JWT Bearer to authenticate some tokens as below.

private string GetToken()
    {
        var issuer = _factory.Configuration.GetValue<string>("JwtSettings:Issuer");

        DateTime expiryDate = DateTime.UtcNow.Add(TimeSpan.FromMinutes(1));

        var jwtSecurityToken = new JwtSecurityToken(
            issuer: issuer,
            claims: new List<Claim>()
            {
                new Claim("a claim", "a claim value")
            },
            expires: expiryDate,
            signingCredentials: new SigningCredentials(
                new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_factory.Configuration.GetValue<string> 
("JwtSettings:Secret"))),
                SecurityAlgorithms.RsaSha256Signature
            )
        );

        return new JwtSecurityTokenHandler().WriteToken(jwtSecurityToken);

    }

---

private HttpClient GetClient()
    {
        var client = _factory.CreateClient(new WebApplicationFactoryClientOptions
        {
            AllowAutoRedirect = false,
        });

        var token = GetToken();
        client.DefaultRequestHeaders.Add(HttpRequestHeader.Authorization.ToString(), $"Bearer {token}");
        return client;
    }

But it doesn't work and I don't have any idea cuz I'm new to C-sharp and.Net

It gives me the error of couldn't create the signature

Please Help.

Answer 1

In your code, you have specified SecurityAlgorithms.RsaSha256Signature which is asymmetric key algorithm which requires two keys (private and public key)

For code to work, change SecurityAlgorithms.RsaSha256Signature to SecurityAlgorithms.HmacSha256Signature