錯誤消息的簽名

調用API網關時，這裏是我得到錯誤....錯誤消息的簽名

The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details. 

The Canonical String for this request should have been 
'GET 
/devcam/securehello 

host:*.execute-api.us-west-2.amazonaws.com 
x-amz-date:20161223T170922Z 

host;x-amz-date 
e3b0c44098098s098df098s...8f0s98df098sd09f8s0d98f095' 

The String-to-Sign should have been 
'AWS4-HMAC-SHA256 
20161223T170922Z 
20161223/us-west-2/execute-api/aws4_request 
828177fca39making23409...9840928304980238402983282d'

奇怪的是我比較這對我的規範和字符串進行簽名和它們是相同的..還有什麼我需要檢查？

我試圖用臨時aws lambda證書來調用它。我不完全確定我應該如何使用會話令牌，但現在它被添加爲頭（我已經嘗試將它包括在已簽名的頭文件中並且不包含它 - 兩者都不起作用）「X-Amz - 安全令牌」。

編輯：

下面是我使用發送請求.NET核心的JSON序列HttpMessageRequest對象。

{ 
    "Version": { 
    "Major": 1, 
    "Minor": 1, 
    "Build": -1, 
    "Revision": -1, 
    "MajorRevision": -1, 
    "MinorRevision": -1 
    }, 
    "Content": null, 
    "Method": { 
    "Method": "GET" 
    }, 
    "RequestUri": "https:\/\/somerandomapigatewaystring.execute-api.us-west-2.amazonaws.com\/devcam\/securehello", 
    "Headers": [ 
    { 
     "Key": "x-amz-security-token", 
     "Value": [ 
     "FQoDYXdzEKr\/\/\/\/\/\/\/\/\/\/wEaDPuFLZoHsomefmorefakevaluesin5here0+36yIwO1kh8sdkeuf98eek3kj4934898erjthisisafakevaluehahahahahahahahaz8FE7jKvENO1IdshzqjDFWhpnfLESAS4B404dBW\/VAkH1jJDvpiFylP5qiZk6q+S\/eJHDdLUoVAXDqkh0w2wkFdXNpsMsfr8eLdzXP8jT\/ZDA+OxG2qzxd1UaotDl\/\/NSzWjNyOYGX3pEoNk9LtefKBGKbgTvH5lrguydfN8JFb4mGjtP8wRY7tjHHq8jtLQhJMRiub3eGnR\/vxwNQk8EJ5usJxB1UF2Kl0p5LqSohViivqfXCBQ==" 
     ] 
    }, 
    { 
     "Key": "host", 
     "Value": [ 
     "somerandomapigatewaystring.execute-api.us-west-2.amazonaws.com" 
     ] 
    }, 
    { 
     "Key": "x-amz-date", 
     "Value": [ 
     "20161223T200041Z" 
     ] 
    }, 
    { 
     "Key": "Authorization", 
     "Value": [ 
     "AWS4-HMAC-SHA256 Credential=********************\/20161223\/us-west-2\/execute-api\/aws4_request, SignedHeaders=host;x-amz-date, Signature=3e0d3***********************************************************" 
     ] 
    } 
    ], 
    "Properties": { 

    } 
}

這是我的代碼 - 我爲這個爛攤子道歉。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net.Http; 
using System.Net.Http.Headers; 
using System.Text; 
using System.Threading.Tasks; 
using Amazon.CloudFormation; 
using Amazon.IdentityManagement; 
using Amazon.IdentityManagement.Model; 
using Amazon.Lambda.Core; 
using Amazon.Runtime.Internal; 
using Amazon.Runtime.Internal.Auth; 
using Amazon.SecurityToken; 
using Amazon.SecurityToken.Model; 
using bifrost; 
using Newtonsoft.Json; 

namespace Bifrost 
{ 
    public class Handler 
    { 
     private static HttpClient httpClient = new HttpClient(); //yes we want this to be static https://aspnetmonsters.com/2016/08/2016-08-27-httpclientwrong/ 
     private static string Service = "execute-api"; 
//  private static string Service = "apigateway"; 
     private static string Algorithm = "AWS4-HMAC-SHA256"; 
     public const string Iso8601DateTimeFormat = "yyyyMMddTHHmmssZ"; 
     public const string Iso8601DateFormat = "yyyyMMdd"; 

     public Response Hello(Request request, ILambdaContext context) 
     { 
      try 
      { 

       var now = DateTime.Now; 
       var signedHeaders = new string[] 
       { 
//     "content-type", 
        "host", //http://docs.aws.amazon.com/general/latest/gr/rande.html#apigateway_region 
        "x-amz-date", 
//     "x-amz-security-token", 
//     "Authorization", 
//     "Credential" 
       }; 

       //X-Amz-Security-Token 

       HttpRequestMessage httpRequest = new HttpRequestMessage(HttpMethod.Get, "https://somerandomapigatewaystring.execute-api.us-west-2.amazonaws.com/devcam/securehello"); 
       httpRequest.Headers.Add("x-amz-security-token", EnvironmentVariables.SessionToken); 

//    httpRequest.Headers.Add("host", "apigateway.us-west-2.amazonaws.com"); 
       httpRequest.Headers.Add("host", "somerandomapigatewaystring.execute-api.us-west-2.amazonaws.com"); 
       httpRequest.Headers.Add("x-amz-date", now.ToString(Iso8601DateTimeFormat)); 
//    httpRequest.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json"); 

//    httpRequest.Headers.Add("X-Amz-Security-Token", EnvironmentVariables.SessionToken); 

       string credentialScope = String.Format("{0}/{1}/{2}/aws4_request", now.ToString(Iso8601DateFormat), 
        EnvironmentVariables.Region, Service); 
       string credentialString = EnvironmentVariables.AccessKeyId + "/" + credentialScope; 

       string signedHeadersString = string.Join(";", 
        signedHeaders.Select(x => x.Trim().ToLowerInvariant()).OrderBy(x => x)); 

//    AwsV4SignatureCalculator signatureCalculator = new AwsV4SignatureCalculator(EnvironmentVariables.SecretKey, Service, "us-west-2"); 
//    string signature = signatureCalculator.CalculateSignature(httpRequest, signedHeaders, now); 

       string signature = getSignature(EnvironmentVariables.AccessKeyId, Service, "us-west-2", httpRequest, signedHeaders, now); 


       // task 4: add signing info to request 
       string authorization = CreateAuthorizationGET(signature, signedHeadersString, credentialScope); 


       Console.WriteLine("authorization:"); 
       Console.WriteLine(authorization); 

//    The format of value 'AWS4-HMAC-SHA256 Credential=/20161222/us-west-2/execute-api/aws4_request, SignedHeaders=host;x-amz-date;x-amz-security-token, Signature=. 

       //    httpRequest.Headers.Add("Authorization", authorization); 
       httpRequest.Headers.TryAddWithoutValidation("Authorization", authorization); 
//    httpRequest.Headers.TryAddWithoutValidation("Authorization", authorization + ", X-Amz-Security-Token=" + EnvironmentVariables.SessionToken); 


//    httpRequest.Version = Version./ 
       var response = httpClient.SendAsync(httpRequest); 

        return new Response 
        { 
         Body = 
          "Go Serverless v1.0! Your function executed successfully!\r\n" + 
          JsonConvert.SerializeObject(request) 
          + "\r\n\r\n" + JsonConvert.SerializeObject(context) + "\r\n\r\n" + 
          JsonConvert.SerializeObject(Environment.GetEnvironmentVariables()) + "\r\n\r\n" + 
          JsonConvert.SerializeObject(httpRequest) + "\r\n\r\n" + 
          JsonConvert.SerializeObject(response.Result) + "\r\n\r\n" + 
//       "", 
          response.Result.Content.ReadAsStringAsync().Result, 
         StatusCode = 200, 
         Headers = new Dictionary<string, string>() 
        }; 
      } 
      catch (Exception e) 
      { 

       return new Response 
       { 
        StatusCode = 200, 
        Body = e.Message + "\r\n\r\n" + e.StackTrace + 
        "\r\n\r\n" + e.InnerException.StackTrace, 
        Headers = new Dictionary<string, string>() 
       }; 
      } 
     } 

     private string getSignature(string accessKey, string service, string region, HttpRequestMessage httpRequest, string[] signedHeaders, DateTime now) 
     { 

//   httpRequest.Content = new StringContent("", Encoding.UTF8, 
//      "application/json"); 

      var signedHeadersDict = createSignedHeadersDictionary(signedHeaders, httpRequest); 

      string hashedPayload = AWSAuthenticationHelper.HashAndHexEncodeString(""); 
      string canonicalHeaders = string.Join("\n", signedHeadersDict.Select(x => x.Key.ToLowerInvariant() + ":" + x.Value.Trim())) + "\n"; 

      string signedHeadersString = string.Join(";", signedHeaders); 

//   httpRequest.Headers.Add("X-Amz-SignedHeaders", signedHeadersString); 


      string canonicalRequest = AWSAuthenticationHelper.CreateCanconicalRequestGET(hashedPayload, signedHeadersString, canonicalHeaders, 
       httpRequest.RequestUri.AbsolutePath, 
       httpRequest.RequestUri.Query); 

      Console.WriteLine("Canonical String:"); 
      Console.WriteLine(canonicalRequest); 

      string hashedCanonicalRequest = AWSAuthenticationHelper.HashAndHexEncodeString(canonicalRequest); 

      string dateStamp = now.ToString(Iso8601DateFormat); 
      string dateTimeStamp = now.ToString(Iso8601DateTimeFormat); 

//   httpRequest.Headers.Add("X-Amz-Date", now.ToString(Iso8601DateTimeFormat)); 

      string credentialScope = String.Format("{0}/{1}/{2}/aws4_request", dateStamp, region, service); 

//   httpRequest.Headers.Add("X-Amz-Credential", credentialScope); 

      string stringToSign = CreateStringToSign(hashedCanonicalRequest, dateTimeStamp, credentialScope); 

      Console.WriteLine("stringToSign:"); 
      Console.WriteLine(stringToSign); 

      // task 3: calculate signature 
      string signature = AWSAuthenticationHelper.CreateSignature(stringToSign, dateStamp, region, service, accessKey); 
      return signature; 
     } 

     private string CreateAuthorizationGET(string signature, string signedHeaders, string credentialScope) 
     { 
      return String.Format("{0} Credential={1}/{2}, SignedHeaders={3}, Signature={4}", Algorithm, EnvironmentVariables.AccessKeyId, credentialScope, signedHeaders, signature); 
     } 

     private string CreateStringToSign(string hashedRequest, string requestDate, string credentialScope) 
     { 
      string stringToSign = string.Format("{0}\n{1}\n{2}\n{3}", Algorithm, requestDate, credentialScope, hashedRequest); 
      return stringToSign; 
     } 

     private SortedDictionary<string, string> createSignedHeadersDictionary(string[] signedHeaders, HttpRequestMessage httpRequest) 
     { 
      SortedDictionary<string, string> ret = new SortedDictionary<string, string>(); 
      List<string> signedHeadersList = signedHeaders.Select(x => x.ToLowerInvariant().Trim()).OrderBy(x => x).ToList(); 

      foreach (KeyValuePair<string, IEnumerable<string>> header in httpRequest.Headers) 
      { 
       if (signedHeadersList.Contains(header.Key.ToLowerInvariant().Trim())) 
       { 
        ret.Add(header.Key, String.Join(",", header.Value)); // TODO: is tostring safe here? 
       } 
      } 

      if (httpRequest.Content != null && httpRequest.Content.Headers != null) 
      { 
       foreach (var contentHeader in httpRequest.Content.Headers) 
       { 
        if (signedHeaders.Contains(contentHeader.Key.ToLowerInvariant().Trim())) 
        { 
         ret.Add(contentHeader.Key, string.Join(",", contentHeader.Value)); 
        } 
       } 
      } 
//   else if (signedHeadersList.Contains("content-type")) 
//   { 
//    throw new Exception("content-type header set but no Content found"); 
//   } 

      return ret; 
     } 

     public Response SecureHello(Request request, ILambdaContext context) 
     { 
      return new Response 
      { 
       Body = "securely called!\r\n" + JsonConvert.SerializeObject(request) 
         + "\r\n\r\n" + JsonConvert.SerializeObject(context) + "\r\n\r\n" + 
         JsonConvert.SerializeObject(Environment.GetEnvironmentVariables()), 
       StatusCode = 200, 
       Headers = new Dictionary<string, string>() 
      }; 
     } 
    } 


    public class Response : BaseResponse 
    { 
    } 

    public class Request : BaseRequest 
    { 
    } 
}

而且更多的代碼...

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Security.Cryptography; 
using System.Text; 
using System.Threading.Tasks; 

namespace bifrost 
{ 
    public class AWSAuthenticationHelper 
    { 

     public static string HashAndHexEncodeString(string str) 
     { 
      return HexEncode(GenerateHash(ToBytes(str))); 
     } 

     public static string CreateSignature(string stringToSign, string dateStamp, string region, string serviceName, string awsKey) 
     { 
      byte[] key = GenerateKey(dateStamp, region, serviceName, awsKey); 
      return HexEncode(HmacSha256(stringToSign, key)); 
     } 

     public static string CreateCanconicalRequestPOST(string hashedPayload, string signedHeaders, string canonicalHeaders, string canonicalURI) 
     { 
      string canonicalRequest = "POST" + "\n" + canonicalURI + "\n" + "" + "\n" + canonicalHeaders + "\n" + 
             signedHeaders + "\n" + hashedPayload; 

      return canonicalRequest; 
     } 

     public static string CreateCanconicalRequestGET(string hashedPayload, string signedHeaders, string canonicalHeaders, string canonicalURI, string canonicalQueryString) 
     { 
      string canonicalRequest = "GET" + "\n" + 
             canonicalURI + "\n" + 
             canonicalQueryString + "\n" + 
             canonicalHeaders + "\n" + 
             signedHeaders + "\n" 
            + hashedPayload; 

      return canonicalRequest; 
     } 

     private static byte[] GenerateKey(string dateStamp, string region, string serviceName, string awsSecretKey) 
     { 
      byte[] kDate = HmacSha256(dateStamp, ToBytes("AWS4" + awsSecretKey)); 
      byte[] kRegion = HmacSha256(region, kDate); 
      byte[] kService = HmacSha256(serviceName, kRegion); 
      return HmacSha256("aws4_request", kService); 
     } 

     private static string HexEncode(byte[] bytes) 
     { 
      return BitConverter.ToString(bytes).Replace("-", string.Empty).ToLowerInvariant(); 
     } 

     private static byte[] ToBytes(string str) 
     { 
      return Encoding.UTF8.GetBytes(str.ToCharArray()); 
     } 

     private static byte[] GenerateHash(byte[] bytes) 
     { 
      return SHA256.Create().ComputeHash(bytes); 
     } 

     private static byte[] HmacSha256(String data, byte[] key) 
     { 
      return new HMACSHA256(key).ComputeHash(ToBytes(data)); 
     } 
    } 
}

更新規範請求字符串：

GET 
/devcam/securehello 

host:somerandomapigatewaystring.execute-api.us-west-2.amazonaws.com 
x-amz-date:20161223T200041Z 

host;x-amz-date 
e3b0ooooyeaaac149afbf4c89somemorefake8888fvaluesa495991oooyea855

更新字符串註冊

AWS4-HMAC-SHA256 
20161223T200041Z 
20161223/us-west-2/execute-api/aws4_request 
01b7ad17a58c442ed893ece5acb63a650b9781e32d23cb4d4114777d224deaf7

更新認證頭：

AWS4-HMAC-SHA256 Credential=ASPECIALSECRETEKEYKK/20161223/us-west-2/execute-api/aws4_request, SignedHeaders=host;x-amz-date, Signature=3e0immodifyingthesevaluesjusttobesafeoiuoiuoiuoiukjh8a30540609fe

來源

2016-12-23 CamHart

好吧我找到了使它工作的代碼。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net.Http; 
using System.Text; 
using System.Text.RegularExpressions; 

namespace bifrost 
{ 
    public class AwsSigningHelper 
    { 
     private const string Service = "execute-api"; 
     public static readonly StringContent EmptyContent = new StringContent("", Encoding.UTF8, "application/json"); 
     public const string Iso8601DateTimeFormat = "yyyyMMddTHHmmssZ"; 
     public const string Iso8601DateFormat = "yyyyMMdd"; 

     private static string GetHost(string url) 
     { 
      Regex reg = new Regex(@"https\:\/\/([a-z|0-9|A-Z]+\.execute-api\.[a-z|A-Z|0-9|-]+.amazonaws\.com).*"); 

      Match match = reg.Match(url); 

      Console.WriteLine("host: " + match.Groups[1].Value); 

      return match.Groups[1].Value; 
     } 

     public static HttpRequestMessage GenerateAwsSignedGetRequest(string endpointUrl, string awsRegion, string accessKeyId, string secretAccessKey, string sessionToken) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Get, endpointUrl, EmptyContent, 
       awsRegion, accessKeyId, secretAccessKey, sessionToken); 
     } 

     public static HttpRequestMessage GenerateAwsSignedGetRequest(string endpointUrl, string awsRegion, string accessKeyId, string secretAccessKey) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Get, endpointUrl, EmptyContent, 
       awsRegion, accessKeyId, secretAccessKey, null); 
     } 

     public static HttpRequestMessage GenerateAwsSignedPostRequest(string endpointUrl, HttpContent content, string awsRegion, string accessKeyId, string secretAccessKey, string sessionToken) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Post, endpointUrl, content, 
       awsRegion, accessKeyId, secretAccessKey, sessionToken); 
     } 

     public static HttpRequestMessage GenerateAwsSignedPostRequest(string endpointUrl, HttpContent content, string awsRegion, string accessKeyId, string secretAccessKey) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Post, endpointUrl, content, 
       awsRegion, accessKeyId, secretAccessKey, null); 
     } 

     public static HttpRequestMessage GenerateAwsSignedPutRequest(string endpointUrl, HttpContent content, string awsRegion, string accessKeyId, string secretAccessKey, string sessionToken) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Put, endpointUrl, content, 
       awsRegion, accessKeyId, secretAccessKey, sessionToken); 
     } 

     public static HttpRequestMessage GenerateAwsSignedPutRequest(string endpointUrl, HttpContent content, string awsRegion, string accessKeyId, string secretAccessKey) 
     { 
      return GenerateAwsSignedRequest(HttpMethod.Put, endpointUrl, content, 
       awsRegion, accessKeyId, secretAccessKey, null); 
     } 

     private static string CreateAuthorizationHeader(string awsAccessKey, string signature, string signedHeaders, string dateStamp, string region, string serviceName) 
     { 
      return String.Format("AWS4-HMAC-SHA256 Credential={0}/{1}/{2}/{3}/aws4_request, SignedHeaders={4}, Signature={5}", 
       awsAccessKey, dateStamp, region, serviceName, signedHeaders, signature); 
     } 

     private static HttpRequestMessage GenerateAwsSignedRequest(HttpMethod method, string endpointUrl, HttpContent content, string awsRegion, string accessKeyId, string secretAccessKey, string sessionToken) 
     { 

      DateTime now = DateTime.UtcNow; 
      HttpRequestMessage httpRequest = new HttpRequestMessage(method, endpointUrl); 
      httpRequest.Headers.Add("host", GetHost(endpointUrl)); 
      httpRequest.Headers.Add("x-amz-date", now.ToString(Iso8601DateTimeFormat)); 
      httpRequest.Content = content; 

      List<string> signHeadersList = new List<string> 
      { 
        "content-type", 
        "host", 
        "x-amz-date", 
      }; 

      if (!string.IsNullOrWhiteSpace(sessionToken)) 
      { 
       signHeadersList.Add("x-amz-security-token"); 
       httpRequest.Headers.Add("x-amz-security-token", sessionToken); 
      } 

      string[] signedHeaders = signHeadersList.ToArray(); 

      string signedHeadersString = string.Join(";", 
       signedHeaders.Select(x => x.Trim().ToLowerInvariant()).OrderBy(x => x)); 

      AwsV4SignatureCalculator signatureCalculator = new AwsV4SignatureCalculator(secretAccessKey, Service, awsRegion); 
      string signature = signatureCalculator.CalculateSignature(httpRequest, signedHeaders, now); 

      string authorization = CreateAuthorizationHeader(accessKeyId, signature, 
       signedHeadersString, now.ToString(Iso8601DateFormat), awsRegion, Service); 

      httpRequest.Headers.TryAddWithoutValidation("Authorization", authorization); 

      return httpRequest; 
     } 
    } 
}

而且從https://gist.github.com/yvanin/0bdf68c1139ad698519e：

using System; 
using System.Collections.Generic; 
using System.Globalization; 
using System.Linq; 
using System.Net.Http; 
using System.Security.Cryptography; 
using System.Text; 
using Microsoft.AspNetCore.WebUtilities; 
using Microsoft.Extensions.Primitives; 

namespace bifrost 
{ 
    public class AwsV4SignatureCalculator 
    { 
     public const string Iso8601DateTimeFormat = "yyyyMMddTHHmmssZ"; 
     public const string Iso8601DateFormat = "yyyyMMdd"; 

     private readonly string _awsSecretKey; 
     private readonly string _service; 
     private readonly string _region; 

     public AwsV4SignatureCalculator(string awsSecretKey, string service, string region = null) 
     { 
      _awsSecretKey = awsSecretKey; 
      _service = service; 
      _region = region ?? "us-east-1"; 
     } 

     /// <summary> 
     /// Calculates request signature string using Signature Version 4. 
     /// http://docs.aws.amazon.com/general/latest/gr/sigv4_signing.html 
     /// </summary> 
     /// <param name="request">Request</param> 
     /// <param name="signedHeaders">Canonical headers that are a part of a signing process</param> 
     /// <param name="requestDate">Date and time when request takes place</param> 
     /// <returns>Signature</returns> 
     public string CalculateSignature(HttpRequestMessage request, string[] signedHeaders, DateTime requestDate) 
     { 
      signedHeaders = signedHeaders.Select(x => x.Trim().ToLowerInvariant()).OrderBy(x => x).ToArray(); 

      var canonicalRequest = GetCanonicalRequest(request, signedHeaders); 
      var stringToSign = GetStringToSign(requestDate, canonicalRequest); 
      return GetSignature(requestDate, stringToSign); 
     } 

     // http://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html 
     private static string GetCanonicalRequest(HttpRequestMessage request, string[] signedHeaders) 
     { 
      var canonicalRequest = new StringBuilder(); 
      canonicalRequest.AppendFormat("{0}\n", request.Method.Method); 
      canonicalRequest.AppendFormat("{0}\n", request.RequestUri.AbsolutePath); 

      canonicalRequest.AppendFormat("{0}\n", GetCanonicalQueryParameters(QueryHelpers.ParseQuery(request.RequestUri.Query))); 
      canonicalRequest.AppendFormat("{0}\n", GetCanonicalHeaders(request, signedHeaders)); 
      canonicalRequest.AppendFormat("{0}\n", String.Join(";", signedHeaders)); 
      canonicalRequest.Append(GetPayloadHash(request)); 
      return canonicalRequest.ToString(); 
     } 

     private static string GetCanonicalQueryParameters(Dictionary<string, StringValues> queryParameters) 
     { 


      StringBuilder canonicalQueryParameters = new StringBuilder(); 
      foreach (KeyValuePair<string, StringValues> keyValuePair in queryParameters) 
      { 
       canonicalQueryParameters.AppendFormat("{0}={1}&", Utils.UrlEncode(keyValuePair.Key), 
                 Utils.UrlEncode(keyValuePair.Value)); 
      } 

      // remove trailing '&' 
      if (canonicalQueryParameters.Length > 0) 
       canonicalQueryParameters.Remove(canonicalQueryParameters.Length - 1, 1); 

      return canonicalQueryParameters.ToString(); 
     } 

     private static string GetCanonicalHeaders(HttpRequestMessage request, IEnumerable<string> signedHeaders) 
     { 
      var headers = request.Headers.ToDictionary(x => x.Key.Trim().ToLowerInvariant(), 
                 x => String.Join(" ", x.Value).Trim()); 

      if (request.Content != null) 
      { 
       var contentHeaders = request.Content.Headers.ToDictionary(x => x.Key.Trim().ToLowerInvariant(), 
                      x => String.Join(" ", x.Value).Trim()); 
       foreach (var contentHeader in contentHeaders) 
       { 
        headers.Add(contentHeader.Key, contentHeader.Value); 
       } 
      } 

      var sortedHeaders = new SortedDictionary<string, string>(headers); 

      StringBuilder canonicalHeaders = new StringBuilder(); 
      foreach (var header in sortedHeaders.Where(header => signedHeaders.Contains(header.Key))) 
      { 
       canonicalHeaders.AppendFormat("{0}:{1}\n", header.Key, header.Value); 
      } 
      return canonicalHeaders.ToString(); 
     } 

     private static string GetPayloadHash(HttpRequestMessage request) 
     { 
      var payload = request.Content != null ? request.Content.ReadAsStringAsync().Result : ""; 
      return Utils.ToHex(Utils.Hash(payload)); 
     } 

     // http://docs.aws.amazon.com/general/latest/gr/sigv4-create-string-to-sign.html 
     private string GetStringToSign(DateTime requestDate, string canonicalRequest) 
     { 
      var dateStamp = requestDate.ToString(Iso8601DateFormat, CultureInfo.InvariantCulture); 
      var scope = string.Format("{0}/{1}/{2}/{3}", dateStamp, _region, _service, "aws4_request"); 

      var stringToSign = new StringBuilder(); 
      stringToSign.AppendFormat("AWS4-HMAC-SHA256\n{0}\n{1}\n", 
             requestDate.ToString(Iso8601DateTimeFormat, CultureInfo.InvariantCulture), 
             scope); 
      stringToSign.Append(Utils.ToHex(Utils.Hash(canonicalRequest))); 
      return stringToSign.ToString(); 
     } 

     // http://docs.aws.amazon.com/general/latest/gr/sigv4-calculate-signature.html 
     private string GetSignature(DateTime requestDate, string stringToSign) 
     { 
      var kSigning = GetSigningKey(requestDate); 
      return Utils.ToHex(Utils.GetKeyedHash(kSigning, stringToSign)); 
     } 

     private byte[] GetSigningKey(DateTime requestDate) 
     { 
      var dateStamp = requestDate.ToString(Iso8601DateFormat, CultureInfo.InvariantCulture); 
      var kDate = Utils.GetKeyedHash("AWS4" + _awsSecretKey, dateStamp); 
      var kRegion = Utils.GetKeyedHash(kDate, _region); 
      var kService = Utils.GetKeyedHash(kRegion, _service); 
      return Utils.GetKeyedHash(kService, "aws4_request"); 
     } 

     private static class Utils 
     { 
      private const string ValidUrlCharacters = 
       "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_.~"; 

      public static string UrlEncode(string data) 
      { 
       StringBuilder encoded = new StringBuilder(); 
       foreach (char symbol in Encoding.UTF8.GetBytes(data)) 
       { 
        if (ValidUrlCharacters.IndexOf(symbol) != -1) 
        { 
         encoded.Append(symbol); 
        } 
        else 
        { 
         encoded.Append("%").Append(string.Format(CultureInfo.InvariantCulture, "{0:X2}", (int)symbol)); 
        } 
       } 
       return encoded.ToString(); 
      } 

      public static byte[] Hash(string value) 
      { 
       using (var sha256Algorithm = SHA256.Create()) 
       { 
        byte[] hash = sha256Algorithm.ComputeHash(Encoding.UTF8.GetBytes(value)); 
        return hash; 
       } 
      } 

      public static byte[] GetKeyedHash(string key, string value) 
      { 
       return GetKeyedHash(Encoding.UTF8.GetBytes(key), value); 
      } 

      public static byte[] GetKeyedHash(byte[] key, string value) 
      { 
       KeyedHashAlgorithm mac = new HMACSHA256(key); 
       mac.Initialize(); 
       return mac.ComputeHash(Encoding.UTF8.GetBytes(value)); 
      } 

      public static string ToHex(byte[] data) 
      { 
       StringBuilder sb = new StringBuilder(); 
       for (int i = 0; i < data.Length; i++) 
       { 
        sb.Append(data[i].ToString("x2", CultureInfo.InvariantCulture)); 
       } 
       return sb.ToString(); 
      } 
     } 
    } 
}

實例：

   HttpRequestMessage httpRequestPost = 
        AwsSigningHelper.GenerateAwsSignedPostRequest(someapigatewayurl, 
//      AwsSigningHelper.EmptyContent, 
//      new StringContent("{ \"test\" : \"test\" }", Encoding.UTF8, "application/json"), 
         new StringContent("text!", Encoding.UTF8, "text/plain"), 
         EnvironmentVariables.Region, EnvironmentVariables.AccessKeyId, EnvironmentVariables.SecretAccessKey, 
         EnvironmentVariables.SessionToken); 

       var responsePost = httpClient.SendAsync(httpRequestPost).Result;

來源

2017-01-09 21:31:34 CamHart

你爲我節省了很多時間。非常感謝你 – Viji

@CamHart +1尼斯和乾淨的例子以及參考文獻。 –

你應該傳遞會話令牌在頁眉或查詢參數http://docs.aws.amazon.com/IAM/latest/UserGuide/id_credentials_temp_use-resources.html，但你不需要把它列入簽署的字符串中。

你有沒有試過測試過這個郵差？（https://www.getpostman.com/）它可能會發送一些額外的標題。如果您可以共享相關代碼部分，那麼調試會很有幫助。

來源

2016-12-23 19:43:32

我更新的代碼的問題。感謝您看這個，我很感激！ – CamHart

錯誤消息的簽名

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