情景：公司项目基于.net4.0,web客户端实现单点登录需要自己解密id_token，对于jwt解密，.net提供了IdentityModel类库，但是4.0中该类库不可用，所以自己实现了解密方法..
使用了类库：链接地址
下面直接贴代码，直接调用DecodeJWT方法就行，参数为id_token，key默认为空字符串"",
代码
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public static IDictionary<string, object> DecodeJWT(string jwttoken,string key)
{
//从/.well-known/openid-configuration路径获取jwks_uri
var webClient = new WebClient();
var endpoint = "http://localhost:5000/.well-known/openid-configuration";
var json = webClient.DownloadString(endpoint);
JObject metadata = JsonConvert.DeserializeObject<JObject>(json);
var jwksUri = metadata["jwks_uri"].ToString();
//从jwks_uri获取keys
json = webClient.DownloadString(jwksUri);
var keys = JsonConvert.DeserializeObject<CustomJWKs>(json);
//从jwt获取头部kid,并从keys中找到匹配kid的key
string[] tokenParts = jwttoken.Split('.');
byte[] bytes = FromBase64Url(tokenParts[0]);
string head= Encoding.UTF8.GetString(bytes);
string kid = JsonConvert.DeserializeObject<JObject>(head)["kid"].ToString();
var defaultkey=keys.keys.Where(t => t.kid == kid).FirstOrDefault();
if(defaultkey==null)
{
throw new Exception("未找到匹配的kid");
}
//jwt解密
return RS256Decode(jwttoken, key, defaultkey.e, defaultkey.n);
}
public static IDictionary<string, object> RS256Decode(string token, string secret, string exponent,string modulus)
{
try
{
IJsonSerializer serializer = new JsonNetSerializer();
IDateTimeProvider provider = new UtcDateTimeProvider();
IJwtValidator validator = new JwtValidator(serializer, provider);
IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
RSAlgorithmFactory rS256Algorithm = new RSAlgorithmFactory(() =>
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.ImportParameters(
new RSAParameters()
{
Modulus = FromBase64Url(modulus),
Exponent = FromBase64Url(exponent)
});
byte[] rsaBytes = rsa.ExportCspBlob(true);
X509Certificate2 cert = new X509Certificate2(rsaBytes);
return cert;
});
IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder, rS256Algorithm);
var json = decoder.DecodeToObject(token, secret, verify: false);
return json;
}
catch (TokenExpiredException)
{
throw new Exception("token已过期");
//Console.WriteLine("Token has expired");
//return null;
}
catch (SignatureVerificationException)
{
throw new Exception("token验证失败");
//Console.WriteLine("Token has invalid signature");
//return null;
}
}
public 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);
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。
原文链接：https://www.cnblogs.com/ldybyz/archive/2018/09/21/9688088.html
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