情景：公司項目基于.net4.0,web客戶端實現單點登錄需要自己解密id_token，對于jwt解密，.net提供了IdentityModel類庫，但是4.0中該類庫不可用，所以自己實現了解密方法..
使用了類庫：鏈接地址
下面直接貼代碼，直接調用DecodeJWT方法就行，參數為id_token，key默認為空字符串"",
代碼
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public static IDictionary<string, object> DecodeJWT(string jwttoken,string key) { //從/.well-known/openid-configuration路徑獲取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(); //從jwks_uri獲取keys json = webClient.DownloadString(jwksUri); var keys = JsonConvert.DeserializeObject<CustomJWKs>(json); //從jwt獲取頭部kid,并從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已過期"); //Console.WriteLine("Token has expired"); //return null; } catch (SignatureVerificationException) { throw new Exception("token驗證失敗"); //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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原文鏈接：https://www.cnblogs.com/ldybyz/archive/2018/09/21/9688088.html
