diff --git a/README.md b/README.md
index b2dc28f..b785c7b 100644
--- a/README.md
+++ b/README.md
@@ -273,6 +273,7 @@ $.ajax({
 * url: ``String``
 * method: ``String`` default ``'GET'``
 * data: ``Object`` any custom data you want to send with, including extra oauth option ``oauth_*`` as oauth_callback, oauth_version...
+* includeBodyHash: ``Boolean`` default ``false`` set to true if you want ``oauth_body_hash`` signing
 
 ```js
 var request_data = {
diff --git a/oauth-1.0a.js b/oauth-1.0a.js
index 2367b9e..411a016 100644
--- a/oauth-1.0a.js
+++ b/oauth-1.0a.js
@@ -78,6 +78,10 @@ OAuth.prototype.authorize = function(request, token) {
         request.data = {};
     }
 
+    if(request.includeBodyHash) {
+      oauth_data.oauth_body_hash = this.getBodyHash(request, token.secret)
+    }
+
     oauth_data.oauth_signature = this.getSignature(request, token.secret, oauth_data);
 
     return oauth_data;
@@ -94,6 +98,16 @@ OAuth.prototype.getSignature = function(request, token_secret, oauth_data) {
     return this.hash_function(this.getBaseString(request, oauth_data), this.getSigningKey(token_secret));
 };
 
+/**
+ * Create a OAuth Body Hash
+ * @param {Object} request data
+ */
+OAuth.prototype.getBodyHash = function(request, token_secret) {
+  var body = typeof request.data === 'string' ? request.data : JSON.stringify(request.data)
+
+  return this.hash_function(body, this.getSigningKey(token_secret))
+};
+
 /**
  * Base String = Method + Base Url + ParameterString
  * @param  {Object} request data
@@ -115,7 +129,12 @@ OAuth.prototype.getBaseString = function(request, oauth_data) {
  * @return {Object} Parameter string data
  */
 OAuth.prototype.getParameterString = function(request, oauth_data) {
-    var base_string_data = this.sortObject(this.percentEncodeData(this.mergeObject(oauth_data, this.mergeObject(request.data, this.deParamUrl(request.url)))));
+    var base_string_data;
+    if (oauth_data.oauth_body_hash) {
+        base_string_data = this.sortObject(this.percentEncodeData(this.mergeObject(oauth_data, this.deParamUrl(request.url))));
+    } else {
+        base_string_data = this.sortObject(this.percentEncodeData(this.mergeObject(oauth_data, this.mergeObject(request.data, this.deParamUrl(request.url)))));
+    }
 
     var data_str = '';
 
diff --git a/package.json b/package.json
index 2a16af9..198bef0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "oauth-1.0a",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "OAuth 1.0a Request Authorization for Node and Browser.",
   "scripts": {
     "test": "make test"
diff --git a/test/oauth_body_hash.js b/test/oauth_body_hash.js
new file mode 100644
index 0000000..aab1690
--- /dev/null
+++ b/test/oauth_body_hash.js
@@ -0,0 +1,131 @@
+var expect = require('chai').expect;
+var OAuth = require('../oauth-1.0a');
+var crypto = require('crypto');
+
+describe("OAuth Body Hash", function() {
+  var oauth = new OAuth({
+    consumer: {
+      key: '1434affd-4d69-4a1a-bace-cc5c6fe493bc',
+      secret: '932a216f-fb94-43b6-a2d2-e9c6b345cbea'
+    },
+    signature_method: 'HMAC-SHA1',
+    hash_function: function(base_string, key) {
+      return crypto.createHmac('sha1', key).update(base_string).digest('base64');
+    }
+  });
+
+  //overide for testing only !!!
+  oauth.getTimeStamp = function() {
+    return 1484599369;
+  };
+
+  //overide for testing only !!!
+  oauth.getNonce = function(length) {
+    return 't62lMDp9DLwKZJJbZTpmSAhRINGBEOcF';
+  };
+
+  var request = {
+    url: 'http://canvas.docker/api/lti/accounts/1/tool_proxy',
+    method: 'POST',
+    data: {
+      "@context":[
+        "http://purl.imsglobal.org/ctx/lti/v2/ToolProxy"
+      ],
+      "@type":"ToolProxy",
+      "lti_version":"LTI-2p1",
+      "tool_proxy_guid":"0cf04d67-8a0d-4d41-af61-6e8c6fc3e68c",
+      "tool_consumer_profile":"http://canvas.docker/api/lti/accounts/1/tool_consumer_profile/339b6700-e4cb-47c5-a54f-3ee0064921a9",
+      "tool_profile":{
+        "lti_version":"LTI-2p1",
+        "product_instance":{
+          "guid":"fd75124a-140e-470f-944c-114d2d93db40",
+          "product_info":{
+            "product_name":{
+              "default_value":"TestTool",
+              "key":"tool.name"
+            },
+            "product_version":"0.1.0",
+            "product_family":{
+              "code":"testtool",
+              "vendor":{
+                "code":"Example.com",
+                "vendor_name":{
+                  "default_value":"Example",
+                  "key":"tool.vendor.name"
+                }
+              }
+            }
+          }
+        },
+        "base_url_choice":[
+          {
+            "default_base_url":"http://example.docker/",
+            "selector":{
+              "applies_to":[
+                "MessageHandler"
+              ]
+            }
+          }
+        ],
+        "resource_handler":[
+          {
+            "resource_type":{
+              "code":"testtool"
+            },
+            "resource_name":{
+              "default_value":"TestTool",
+              "key":"testtool.resource.name"
+            },
+            "message":[
+              {
+                "message_type":"basic-lti-launch-request",
+                "path":"lti_launch",
+                "enabled_capability":[
+                  "Canvas.placements.courseNavigation"
+                ]
+              }
+            ]
+          }
+        ]
+      },
+      "enabled_capability":[
+        "OAuth.splitSecret"
+      ],
+      "security_contract":{
+        "tp_half_shared_secret":"1c7849d3c9f037a9891575c8508d3aaab6a9e1312b5d0353625f83d68f0d545344f81ff9e1849b6400982a0d3f6bf953c6095265e3b6d700a73f5be94ce5654c"
+      }
+    },
+    includeBodyHash: true
+  };
+
+  describe('#getBodyHash', function() {
+    it('should handle data encoded as an object', function() {
+      expect(oauth.getBodyHash(request, '')).to.equal('F7L9O06JqL/LZpQBlsKC/7R53uM=')
+    });
+
+    it('should handle data encoded as a string', function() {
+      request.data = JSON.stringify(request.data)
+      expect(oauth.getBodyHash(request, '')).to.equal('F7L9O06JqL/LZpQBlsKC/7R53uM=')
+    });
+  });
+
+  describe('#authorize', function() {
+    it('should properly include an oauth_body_hash param', function() {
+      expect(oauth.authorize(request)).to.eql({
+        oauth_consumer_key: '1434affd-4d69-4a1a-bace-cc5c6fe493bc',
+        oauth_nonce: 't62lMDp9DLwKZJJbZTpmSAhRINGBEOcF',
+        oauth_signature_method: 'HMAC-SHA1',
+        oauth_timestamp: 1484599369,
+        oauth_version: '1.0',
+        oauth_body_hash: 'F7L9O06JqL/LZpQBlsKC/7R53uM=',
+        oauth_signature: 'ayrFZ4NkVhALlAPY8WjDJXuzK8Y='
+      });
+    });
+  });
+
+  describe('#toHeader', function() {
+    it('should properly include an oauth_body_hash header', function() {
+      expect(oauth.toHeader(oauth.authorize(request))).to.have.property('Authorization', 'OAuth oauth_body_hash="F7L9O06JqL%2FLZpQBlsKC%2F7R53uM%3D", oauth_consumer_key="1434affd-4d69-4a1a-bace-cc5c6fe493bc", oauth_nonce="t62lMDp9DLwKZJJbZTpmSAhRINGBEOcF", oauth_signature="ayrFZ4NkVhALlAPY8WjDJXuzK8Y%3D", oauth_signature_method="HMAC-SHA1", oauth_timestamp="1484599369", oauth_version="1.0"');
+    });
+  });
+});