在C#中使用公钥验证JWT

using System.IdentityModel.Tokens.Jwt;
using Microsoft.IdentityModel.Tokens;

string jwtToken = "your_jwt_token_here";
string publicKey = "your_public_key_here";

// 创建一个TokenValidationParameters对象
var validationParameters = new TokenValidationParameters
{
    ValidateIssuer = true,
    ValidateAudience = true,
    ValidateIssuerSigningKey = true,
    ValidIssuer = "your_issuer_here",
    ValidAudience = "your_audience_here",
    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(publicKey))
};

// 创建一个JwtSecurityTokenHandler对象
var tokenHandler = new JwtSecurityTokenHandler();

// 创建一个SecurityToken对象
SecurityToken validatedToken;

try
{
    // 验证JWT并解析
    var claimsPrincipal = tokenHandler.ValidateToken(jwtToken, validationParameters, out validatedToken);

    // 在claimsPrincipal对象中获取JWT中的声明信息
    var userId = claimsPrincipal.FindFirst("userId")?.Value;
    var username = claimsPrincipal.FindFirst("username")?.Value;

    // 其他业务逻辑处理...
}
catch (SecurityTokenException ex)
{
    // JWT验证失败，处理异常...
}