使用C＃中的公钥验证使用RS256算法签名的JWT

时间：2015-12-21 20:28:13

标签： c# rsa jwt openid-connect jwk

好的，我明白我问的问题可能很明显，但不幸的是我缺乏关于这个主题的知识，这个任务对我来说似乎很棘手。

我有一个OpenID Connect Provider返回的id令牌（JWT）。这是：

  

eyJraWQiOiIxZTlnZGs3IiwiYWxnIjoiUlMyNTYifQ.ewogImlzcyI6ICJodHRwOi8vc2VydmVyLmV4YW1wbGUuY29tIiwKICJzdWIiOiAiMjQ4Mjg5NzYxMDAxIiwKICJhdWQiOiAiczZCaGRSa3F0MyIsCiAibm9uY2UiOiAibi0wUzZfV3pBMk1qIiwKICJleHAiOiAxMzExMjgxOTcwLAogImlhdCI6IDEzMTEyODA5NzAsCiAiY19oYXNoIjogIkxEa3RLZG9RYWszUGswY25YeENsdEEiCn0.XW6uhdrkBgcGx6zVIrCiROpWURs-4goO1sKA4m9jhJIImiGg5muPUcNegx6sSv43c5DSn37sxCRrDZZm4ZPBKKgtYASMcE20SDgvYJdJS0cyuFw7Ijp_7WnIjcrl6B5cmoM6ylCvsLMwkoQAxVublMwH10oAxjzD6NEFsu9nipkszWhsPePf_rM4eMpkmCbTzume-fzZIi5VjdWGGEmzTg32h3jiex-r5WTHbj-u5HL7u_KP3rmbdYNzlzd1xWRYTUs4E8nOTgzAUwvwXkIQhOh5TPcSMBYy6X3E7-_gr9Ue6n4ND7hTFhtjYs3cjNKIA08qm5cpVYFMFMG6PkhzLQ

其标头和有效负载按以下方式解码：

{
 "kid":"1e9gdk7",
 "alg":"RS256"
}.
{
 "iss": "http://server.example.com",
 "sub": "248289761001",
 "aud": "s6BhdRkqt3",
 "nonce": "n-0S6_WzA2Mj",
 "exp": 1311281970,
 "iat": 1311280970,
 "c_hash": "LDktKdoQak3Pk0cnXxCltA"
}

从IODC提供商的发现中，我获得了公钥（JWK）：

{
 "kty":"RSA",
 "kid":"1e9gdk7",
 "n":"w7Zdfmece8iaB0kiTY8pCtiBtzbptJmP28nSWwtdjRu0f2GFpajvWE4VhfJAjEsOcwYzay7XGN0b-X84BfC8hmCTOj2b2eHT7NsZegFPKRUQzJ9wW8ipn_aDJWMGDuB1XyqT1E7DYqjUCEOD1b4FLpy_xPn6oV_TYOfQ9fZdbE5HGxJUzekuGcOKqOQ8M7wfYHhHHLxGpQVgL0apWuP2gDDOdTtpuld4D2LK1MZK99s9gaSjRHE8JDb1Z4IGhEcEyzkxswVdPndUWzfvWBBWXWxtSUvQGBRkuy1BHOa4sP6FKjWEeeF7gm7UMs2Nm2QUgNZw6xvEDGaLk4KASdIxRQ",
 "e":"AQAB"
}

所以，问题是如何在C＃中使用我所获得的RS256算法的公钥来验证这个JWT？如果有一个很好的教程明确描述这个过程，那将是很棒的。但是，使用System.IdentityModel.Tokens.Jwt如何执行此操作的示例也可以正常工作。

更新： 我理解，我需要做类似下面的代码，但我不知道从哪里获得＆＃39; 密钥＆＃39;用于计算SHA256哈希。

  string tokenStr = "eyJraWQiOiIxZTlnZGs3IiwiYWxnIjoiUlMyNTYifQ.ewogImlzcyI6ICJodHRwOi8vc2VydmVyLmV4YW1wbGUuY29tIiwKICJzdWIiOiAiMjQ4Mjg5NzYxMDAxIiwKICJhdWQiOiAiczZCaGRSa3F0MyIsCiAibm9uY2UiOiAibi0wUzZfV3pBMk1qIiwKICJleHAiOiAxMzExMjgxOTcwLAogImlhdCI6IDEzMTEyODA5NzAsCiAiY19oYXNoIjogIkxEa3RLZG9RYWszUGswY25YeENsdEEiCn0.XW6uhdrkBgcGx6zVIrCiROpWURs-4goO1sKA4m9jhJIImiGg5muPUcNegx6sSv43c5DSn37sxCRrDZZm4ZPBKKgtYASMcE20SDgvYJdJS0cyuFw7Ijp_7WnIjcrl6B5cmoM6ylCvsLMwkoQAxVublMwH10oAxjzD6NEFsu9nipkszWhsPePf_rM4eMpkmCbTzume-fzZIi5VjdWGGEmzTg32h3jiex-r5WTHbj-u5HL7u_KP3rmbdYNzlzd1xWRYTUs4E8nOTgzAUwvwXkIQhOh5TPcSMBYy6X3E7-_gr9Ue6n4ND7hTFhtjYs3cjNKIA08qm5cpVYFMFMG6PkhzLQ";
  string[] tokenParts = tokenStr.Split('.');

  RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
  rsa.ImportParameters(
    new RSAParameters() {
      Modulus = FromBase64Url("w7Zdfmece8iaB0kiTY8pCtiBtzbptJmP28nSWwtdjRu0f2GFpajvWE4VhfJAjEsOcwYzay7XGN0b-X84BfC8hmCTOj2b2eHT7NsZegFPKRUQzJ9wW8ipn_aDJWMGDuB1XyqT1E7DYqjUCEOD1b4FLpy_xPn6oV_TYOfQ9fZdbE5HGxJUzekuGcOKqOQ8M7wfYHhHHLxGpQVgL0apWuP2gDDOdTtpuld4D2LK1MZK99s9gaSjRHE8JDb1Z4IGhEcEyzkxswVdPndUWzfvWBBWXWxtSUvQGBRkuy1BHOa4sP6FKjWEeeF7gm7UMs2Nm2QUgNZw6xvEDGaLk4KASdIxRQ"),
      Exponent = FromBase64Url("AQAB")
    });

  HMACSHA256 sha = new HMACSHA256(key);
  byte[] hash = sha.ComputeHash(Encoding.UTF8.GetBytes(tokenParts[0] + '.' + tokenParts[1]));
  byte[] signature = rsa.Encrypt(hash, false);
  string strSignature = Base64UrlEncode(signature);
  if (String.Compare(strSignature, tokenParts[2], false) == 0)
    return true;

6 个答案:

答案 0 :(得分：38)

感谢 jwilleke ，我有一个解决方案。要验证JWT的RS256签名，需要使用RSAPKCS1SignatureDeformatter类及其VerifySignature方法。

以下是我的示例数据的确切代码：

  string tokenStr = "eyJraWQiOiIxZTlnZGs3IiwiYWxnIjoiUlMyNTYifQ.ewogImlzcyI6ICJodHRwOi8vc2VydmVyLmV4YW1wbGUuY29tIiwKICJzdWIiOiAiMjQ4Mjg5NzYxMDAxIiwKICJhdWQiOiAiczZCaGRSa3F0MyIsCiAibm9uY2UiOiAibi0wUzZfV3pBMk1qIiwKICJleHAiOiAxMzExMjgxOTcwLAogImlhdCI6IDEzMTEyODA5NzAsCiAiY19oYXNoIjogIkxEa3RLZG9RYWszUGswY25YeENsdEEiCn0.XW6uhdrkBgcGx6zVIrCiROpWURs-4goO1sKA4m9jhJIImiGg5muPUcNegx6sSv43c5DSn37sxCRrDZZm4ZPBKKgtYASMcE20SDgvYJdJS0cyuFw7Ijp_7WnIjcrl6B5cmoM6ylCvsLMwkoQAxVublMwH10oAxjzD6NEFsu9nipkszWhsPePf_rM4eMpkmCbTzume-fzZIi5VjdWGGEmzTg32h3jiex-r5WTHbj-u5HL7u_KP3rmbdYNzlzd1xWRYTUs4E8nOTgzAUwvwXkIQhOh5TPcSMBYy6X3E7-_gr9Ue6n4ND7hTFhtjYs3cjNKIA08qm5cpVYFMFMG6PkhzLQ";
  string[] tokenParts = tokenStr.Split('.');

  RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
  rsa.ImportParameters(
    new RSAParameters() {
      Modulus = FromBase64Url("w7Zdfmece8iaB0kiTY8pCtiBtzbptJmP28nSWwtdjRu0f2GFpajvWE4VhfJAjEsOcwYzay7XGN0b-X84BfC8hmCTOj2b2eHT7NsZegFPKRUQzJ9wW8ipn_aDJWMGDuB1XyqT1E7DYqjUCEOD1b4FLpy_xPn6oV_TYOfQ9fZdbE5HGxJUzekuGcOKqOQ8M7wfYHhHHLxGpQVgL0apWuP2gDDOdTtpuld4D2LK1MZK99s9gaSjRHE8JDb1Z4IGhEcEyzkxswVdPndUWzfvWBBWXWxtSUvQGBRkuy1BHOa4sP6FKjWEeeF7gm7UMs2Nm2QUgNZw6xvEDGaLk4KASdIxRQ"),
      Exponent = FromBase64Url("AQAB")
    });

  SHA256 sha256 = SHA256.Create();
  byte[] hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(tokenParts[0] + '.' + tokenParts[1]));

  RSAPKCS1SignatureDeformatter rsaDeformatter = new RSAPKCS1SignatureDeformatter(rsa);
  rsaDeformatter.SetHashAlgorithm("SHA256");
  if (rsaDeformatter.VerifySignature(hash, FromBase64Url(tokenParts[2])))
    MessageBox.Show("Signature is verified");

//...
  static byte[] FromBase64Url(string base64Url)
  {
    string padded = base64Url.Length % 4 == 0
        ? base64Url : base64Url + "====".Substring(base64Url.Length % 4);
    string base64 = padded.Replace("_", "/")
                          .Replace("-", "+");
    return Convert.FromBase64String(base64);
  }

答案 1 :(得分：17)

以下是使用IdentityModel.Tokens.Jwt进行验证的示例：

string tokenStr = "eyJraWQiOiIxZTlnZGs3IiwiYWxnIjoiUlMyNTYifQ.ewogImlzcyI6ICJodHRwOi8vc2VydmVyLmV4YW1wbGUuY29tIiwKICJzdWIiOiAiMjQ4Mjg5NzYxMDAxIiwKICJhdWQiOiAiczZCaGRSa3F0MyIsCiAibm9uY2UiOiAibi0wUzZfV3pBMk1qIiwKICJleHAiOiAxMzExMjgxOTcwLAogImlhdCI6IDEzMTEyODA5NzAsCiAiY19oYXNoIjogIkxEa3RLZG9RYWszUGswY25YeENsdEEiCn0.XW6uhdrkBgcGx6zVIrCiROpWURs-4goO1sKA4m9jhJIImiGg5muPUcNegx6sSv43c5DSn37sxCRrDZZm4ZPBKKgtYASMcE20SDgvYJdJS0cyuFw7Ijp_7WnIjcrl6B5cmoM6ylCvsLMwkoQAxVublMwH10oAxjzD6NEFsu9nipkszWhsPePf_rM4eMpkmCbTzume-fzZIi5VjdWGGEmzTg32h3jiex-r5WTHbj-u5HL7u_KP3rmbdYNzlzd1xWRYTUs4E8nOTgzAUwvwXkIQhOh5TPcSMBYy6X3E7-_gr9Ue6n4ND7hTFhtjYs3cjNKIA08qm5cpVYFMFMG6PkhzLQ";

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(
  new RSAParameters()
  {
      Modulus = FromBase64Url("w7Zdfmece8iaB0kiTY8pCtiBtzbptJmP28nSWwtdjRu0f2GFpajvWE4VhfJAjEsOcwYzay7XGN0b-X84BfC8hmCTOj2b2eHT7NsZegFPKRUQzJ9wW8ipn_aDJWMGDuB1XyqT1E7DYqjUCEOD1b4FLpy_xPn6oV_TYOfQ9fZdbE5HGxJUzekuGcOKqOQ8M7wfYHhHHLxGpQVgL0apWuP2gDDOdTtpuld4D2LK1MZK99s9gaSjRHE8JDb1Z4IGhEcEyzkxswVdPndUWzfvWBBWXWxtSUvQGBRkuy1BHOa4sP6FKjWEeeF7gm7UMs2Nm2QUgNZw6xvEDGaLk4KASdIxRQ"),
      Exponent = FromBase64Url("AQAB")
  });

var validationParameters = new TokenValidationParameters
                {
                    RequireExpirationTime = true,
                    RequireSignedTokens = true,
                    ValidateAudience = false,
                    ValidateIssuer = false,
                    ValidateLifetime = false,
                    IssuerSigningKey = new RsaSecurityKey(rsa)
                };

SecurityToken validatedSecurityToken = null;
var handler = new JwtSecurityTokenHandler();
handler.ValidateToken(tokenStr, validationParameters, out validatedSecurityToken);
JwtSecurityToken validatedJwt = validatedSecurityToken as JwtSecurityToken;

答案 2 :(得分：8)

对于正在寻找一种快速方法来使用带有“ ----- BEGIN PUBLIC KEY -----” /“ ----- END PUBLIC KEY ----”的公钥验证RS256的任何人-“

在BouncyCastle的帮助下，有两种方法。 

    public bool ValidateJasonWebToken(string fullKey, string jwtToken)
    {
        try
        {
            var rs256Token = fullKey.Replace("-----BEGIN PUBLIC KEY-----", "");
            rs256Token = rs256Token.Replace("-----END PUBLIC KEY-----", "");
            rs256Token = rs256Token.Replace("\n", "");

            Validate(jwtToken, rs256Token);
            return true;
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            return false;
        }
    }

    private void Validate(string token, string key)
    {
        var keyBytes = Convert.FromBase64String(key); // your key here

        AsymmetricKeyParameter asymmetricKeyParameter = PublicKeyFactory.CreateKey(keyBytes);
        RsaKeyParameters rsaKeyParameters = (RsaKeyParameters)asymmetricKeyParameter;
        RSAParameters rsaParameters = new RSAParameters
        {
            Modulus = rsaKeyParameters.Modulus.ToByteArrayUnsigned(),
            Exponent = rsaKeyParameters.Exponent.ToByteArrayUnsigned()
        };
        using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
        {
            rsa.ImportParameters(rsaParameters);
            var validationParameters = new TokenValidationParameters()
            {
                RequireExpirationTime = false,
                RequireSignedTokens = true,
                ValidateAudience = false,
                ValidateIssuer = false,
                IssuerSigningKey = new RsaSecurityKey(rsa)
            };
            var handler = new JwtSecurityTokenHandler();
            var result = handler.ValidateToken(token, validationParameters, out var validatedToken);
        }
    }

这是http://codingstill.com/2016/01/verify-jwt-token-signed-with-rs256-using-the-public-key/和使用system.IdentityModel.Tokens.Jwt的@olaf答案的组合

答案 3 :(得分：0)

NET Core

要在import pandas as pd import matplotlib.pyplot as plt import numpy as np from scipy.interpolate import griddata # Example data d = ({ 'Time1' : ['8:00:00','9:30:00','9:40:00','10:25:00','12:30:00','1:31:00','1:35:00','2:45:00','4:50:00'], 'Occurring1' : ['1','2','3','4','5','5','6','6','7'], 'Time2' : ['8:10:00','9:34:00','9:48:00','10:40:00','1:30:00','2:31:00','3:35:00','3:45:00','4:55:00'], 'Occurring2' : ['1','2','2','3','4','5','5','6','7'], 'Time3' : ['9:00:00','9:34:00','9:58:00','10:45:00','10:50:00','12:31:00','1:35:00','2:15:00','3:55:00'], 'Occurring3' : ['1','2','3','4','4','5','6','7','8'], }) # Create dataframe, explicitly define dtypes df = pd.DataFrame(data=d) df = df.astype({ "Time1": np.datetime64, "Occurring1": np.int, "Time2": np.datetime64, "Occurring2": np.int, "Time3": np.datetime64, "Occurring3": np.int, }) # Create 1D vectors of time data all_times = df[["Time1", "Time2", "Time3"]].values # Representation of 1 minute in time t_min = np.timedelta64(int(60*1e9), "ns") # Create a regular time grid with 10 minute spacing time_grid = np.arange(all_times.min(), all_times.max(), 10*t_min, dtype="datetime64") # Storage buffer for interpolated occurring data occurrences_grid = np.zeros((3, len(time_grid))) # Loop over all occurrence data and interpolate to regular grid for i in range(3): occurrences_grid[i] = griddata( points=df["Time%i" % (i+1)].values.astype("float"), values=df["Occurring%i" % (i+1)], xi=time_grid.astype("float"), method="linear" ) # Get min, max, and mean values of interpolated data occ_min = np.min(occurrences_grid, axis=0) occ_max = np.max(occurrences_grid, axis=0) occ_mean = np.mean(occurrences_grid, axis=0) # Plot interpolated data plt.fill_between(time_grid, occ_min, occ_max, color="slategray") plt.plot(time_grid, occ_mean, c="white") plt.xticks(rotation=60) plt.tight_layout() plt.show() 身份验证流程中的.NET核心Web API（请参见下面的.NET Framework）中使用此功能，我增强了NvMat的出色答案：

非常重要的是不要在using语句中使用AddJwtBearer()。

RSACryptoServiceProvider

然后您就可以像这样在启动中使用身份验证：

    private TokenValidationParameters GetTokenValidationParameters(string key)
    {
        var rs256Token = key.Value.Replace("-----BEGIN PUBLIC KEY-----", "");
        rs256Token = rs256Token.Replace("-----END PUBLIC KEY-----", "");
        rs256Token = rs256Token.Replace("\n", "");

        var keyBytes = Convert.FromBase64String(rs256Token);

        var asymmetricKeyParameter = PublicKeyFactory.CreateKey(keyBytes);
        var rsaKeyParameters = (RsaKeyParameters)asymmetricKeyParameter;
        var rsaParameters = new RSAParameters
        {
            Modulus = rsaKeyParameters.Modulus.ToByteArrayUnsigned(),
            Exponent = rsaKeyParameters.Exponent.ToByteArrayUnsigned()
        };
        var rsa = new RSACryptoServiceProvider();

        rsa.ImportParameters(rsaParameters);

        var validationParameters = new TokenValidationParameters()
        {
            RequireExpirationTime = false,
            RequireSignedTokens = true,
            ValidateAudience = false,
            ValidateIssuer = false,
            IssuerSigningKey = new RsaSecurityKey(rsa),
        };

        return validationParameters;
    }

.NET Framework

也可以在.NET Framework Web API项目中使用此方法。您所要做的就是将此行添加到启动services.AddAuthentication(x => { x.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; x.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }) .AddJwtBearer(options => { options.RequireHttpsMetadata = false; options.SaveToken = true; options.IncludeErrorDetails = true; options.TokenValidationParameters = GetTokenValidationParameters(configuration["Key"]); options.Audience = configuration["ClientId"]; }); 方法中：

Configure()

一件重要的事情：确保使用app.UseJwtBearerAuthentication(new JwtBearerAuthenticationOptions() { TokenValidationParameters = GetTokenValidationParameters(ConfigurationManager.AppSettings["Key"]) }); 的版本> = 5.0.0 我在使用4.X.X版本时遇到问题。

答案 4 :(得分：0)

使用System.Security.Cryptography的.NET JWT签名验证-没有第3方DLL 

var errorMessage = string.Empty;

// Google RSA well known Public Key data is available at https://accounts.google.com/.well-known/openid-configuration by navigating to the path described in the "jwks_uri" parameter.
// {
//     e: "AQAB",        // RSA Exponent
//     n: "ya_7gV....",  // RSA Modulus aka Well Known Public Key
//     alg: "RS256"      // RSA Algorithm
// }

var verified = VerifyJWT_RS256_Signature(
    jwt: "oicjwt....", 
    publicKey: "ya_7gV....", 
    exponent: "AQAB",
    errorMessage: out errorMessage);

if (!verified)
{
    // TODO: log error: 
    // TODO: Do something
}

注意：以下方法验证使用 Asymetric RS256 键签名的OpenID Connect JWT签名。 OpenID Connect提供程序可能会选择使用其他版本的非对称密钥，甚至是像HS256这样的对称密钥。此方法不直接支持其他键类型。

public static bool VerifyJWT_RS256_Signature(string jwt, string publicKey, string exponent, out string errorMessage)
{
    if (string.IsNullOrEmpty(jwt))
    {
        errorMessage = "Error verifying JWT token signature: Javascript Web Token was null or empty.";
        return false;
    }

    var jwtArray = jwt.Split('.');
    if (jwtArray.Length != 3 && jwtArray.Length != 5)
    {
        errorMessage = "Error verifying JWT token signature: Javascript Web Token did not match expected format. Parts count was " + jwtArray.Length + " when it should have been 3 or 5.";
        return false;
    }

    if (string.IsNullOrEmpty(publicKey))
    {
        errorMessage = "Error verifying JWT token signature: Well known RSA Public Key modulus was null or empty.";
        return false;
    }

    if (string.IsNullOrEmpty(exponent))
    {
        errorMessage = "Error verifying JWT token signature: Well known RSA Public Key exponent was null or empty.";
        return false;
    }

    try
    {
        string publicKeyFixed = (publicKey.Length % 4 == 0 ? publicKey : publicKey + "====".Substring(publicKey.Length % 4)).Replace("_", "/").Replace("-", "+");
        var publicKeyBytes = Convert.FromBase64String(publicKeyFixed);

        var jwtSignatureFixed = (jwtArray[2].Length % 4 == 0 ? jwtArray[2] : jwtArray[2] + "====".Substring(jwtArray[2].Length % 4)).Replace("_", "/").Replace("-", "+");
        var jwtSignatureBytes = Convert.FromBase64String(jwtSignatureFixed);

        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.ImportParameters(
            new RSAParameters()
            {
                Modulus = publicKeyBytes,
                Exponent = Convert.FromBase64String(exponent)
            }
        );

        SHA256 sha256 = SHA256.Create();
        byte[] hash = sha256.ComputeHash(Encoding.UTF8.GetBytes(jwtArray[0] + '.' + jwtArray[1]));

        RSAPKCS1SignatureDeformatter rsaDeformatter = new RSAPKCS1SignatureDeformatter(rsa);
        rsaDeformatter.SetHashAlgorithm("SHA256");
        if (!rsaDeformatter.VerifySignature(hash, jwtSignatureBytes))
        {
            errorMessage = "Error verifying JWT token signature: hash did not match expected value.";
            return false;
        }
    }
    catch (Exception ex)
    {
        errorMessage = "Error verifying JWT token signature: " + ex.Message;
        return false;
        //throw ex;
    }

    errorMessage = string.Empty;
    return true;
}

注意：验证OpenID Connect JWT（Javascript Web令牌）的签名只是JWT验证过程的必要步骤之一。确保设置NONCE值，您的系统可以使用该值来防止重放攻击。确保验证JWT软件包的每个参数的完整性和准确性。

答案 5 :(得分：0)

您可以使用Jwt.Net轻松完成此操作。此功能将解码并验证JWT的签名，并将有效负载作为要求的字典返回：

private IDictionary<string, object> Decode(string token, string modulus, string exponent)
{
    var urlEncoder = new JwtBase64UrlEncoder();

    var rsaKey = RSA.Create();
    rsaKey.ImportParameters(new RSAParameters() {
        Modulus = urlEncoder.Decode(modulus),
        Exponent = urlEncoder.Decode(exponent)
    });

    var claims = new JwtBuilder()
        .WithAlgorithm(new RS256Algorithm(rsaKey))
        .MustVerifySignature()
        .Decode<IDictionary<string, object>>(token);

    return claims;
}

样品使用：

string jwt = "eyJraWQiOiIxZTlnZGs3IiwiYWxnIjoiUlMyNTYifQ.ewogImlzcyI6ICJodHRwOi8vc2VydmVyLmV4YW1wbGUuY29tIiwKICJzdWIiOiAiMjQ4Mjg5NzYxMDAxIiwKICJhdWQiOiAiczZCaGRSa3F0MyIsCiAibm9uY2UiOiAibi0wUzZfV3pBMk1qIiwKICJleHAiOiAxMzExMjgxOTcwLAogImlhdCI6IDEzMTEyODA5NzAsCiAiY19oYXNoIjogIkxEa3RLZG9RYWszUGswY25YeENsdEEiCn0.XW6uhdrkBgcGx6zVIrCiROpWURs-4goO1sKA4m9jhJIImiGg5muPUcNegx6sSv43c5DSn37sxCRrDZZm4ZPBKKgtYASMcE20SDgvYJdJS0cyuFw7Ijp_7WnIjcrl6B5cmoM6ylCvsLMwkoQAxVublMwH10oAxjzD6NEFsu9nipkszWhsPePf_rM4eMpkmCbTzume-fzZIi5VjdWGGEmzTg32h3jiex-r5WTHbj-u5HL7u_KP3rmbdYNzlzd1xWRYTUs4E8nOTgzAUwvwXkIQhOh5TPcSMBYy6X3E7-_gr9Ue6n4ND7hTFhtjYs3cjNKIA08qm5cpVYFMFMG6PkhzLQ";
string modulus = "w7Zdfmece8iaB0kiTY8pCtiBtzbptJmP28nSWwtdjRu0f2GFpajvWE4VhfJAjEsOcwYzay7XGN0b-X84BfC8hmCTOj2b2eHT7NsZegFPKRUQzJ9wW8ipn_aDJWMGDuB1XyqT1E7DYqjUCEOD1b4FLpy_xPn6oV_TYOfQ9fZdbE5HGxJUzekuGcOKqOQ8M7wfYHhHHLxGpQVgL0apWuP2gDDOdTtpuld4D2LK1MZK99s9gaSjRHE8JDb1Z4IGhEcEyzkxswVdPndUWzfvWBBWXWxtSUvQGBRkuy1BHOa4sP6FKjWEeeF7gm7UMs2Nm2QUgNZw6xvEDGaLk4KASdIxRQ";
string exponent = "AQAB";

try
{
    IDictionary<string, object> claims = Decode(jwt, modulus, exponent);
}
catch (SignatureVerificationException)
{
    // signature invalid, handle it here
}
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