diff --git a/requests_http_signature/__init__.py b/requests_http_signature/__init__.py
index 5d08b57..9ebb4d6 100644
--- a/requests_http_signature/__init__.py
+++ b/requests_http_signature/__init__.py
@@ -109,16 +109,24 @@ class HTTPSignatureAuth(requests.auth.AuthBase):
         return request
 
     @classmethod
-    def get_sig_struct(self, request):
-        scheme, sig_struct = request.headers["Authorization"].split(" ", 1)
+    def get_sig_struct(self, request, scheme="Authorization"):
+        sig_struct = request.headers[scheme]
+        if scheme == "Authorization":
+            sig_struct = sig_struct.split(" ", 1)[1]
         return {i.split("=", 1)[0]: i.split("=", 1)[1].strip('"') for i in sig_struct.split(",")}
 
     @classmethod
-    def verify(self, request, key_resolver):
-        assert "Authorization" in request.headers, "No Authorization header found"
-        msg = 'Unexpected scheme found in Authorization header (expected "Signature")'
-        assert request.headers["Authorization"].startswith("Signature "), msg
-        sig_struct = self.get_sig_struct(request)
+    def verify(self, request, key_resolver, scheme="Authorization"):
+        if scheme == "Authorization":
+            assert "Authorization" in request.headers, "No Authorization header found"
+            msg = 'Unexpected scheme found in Authorization header (expected "Signature")'
+            assert request.headers["Authorization"].startswith("Signature "), msg
+        elif scheme == "Signature":
+            assert "Signature" in request.headers, "No Signature header found"
+        else:
+            raise RequestsHttpSignatureException('Unknown signature scheme "{}"'.format(scheme))
+
+        sig_struct = self.get_sig_struct(request, scheme=scheme)
         for field in "keyId", "algorithm", "signature":
             assert field in sig_struct, 'Required signature parameter "{}" not found'.format(field)
         assert sig_struct["algorithm"] in self.known_algorithms, "Unknown signature algorithm"
diff --git a/test/test.py b/test/test.py
index c5e20c9..ef48678 100755
--- a/test/test.py
+++ b/test/test.py
@@ -9,19 +9,22 @@ from requests.adapters import HTTPAdapter
 
 sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))) # noqa
 
-from requests_http_signature import HTTPSignatureAuth, RequestsHttpSignatureException
+from requests_http_signature import HTTPSignatureAuth, HTTPSignatureHeaderAuth, RequestsHttpSignatureException
 hmac_secret = b"monorail_cat"
 passphrase = b"passw0rd"
 
 class TestAdapter(HTTPAdapter):
     def __init__(self, testcase):
         self.testcase = testcase
+
     def send(self, request, *args, **kwargs):
         def key_resolver(key_id, algorithm):
             if "pubkey" in request.headers:
                 return base64.b64decode(request.headers["pubkey"])
             return hmac_secret
-        HTTPSignatureAuth.verify(request, key_resolver=key_resolver)
+        HTTPSignatureAuth.verify(request,
+                                 key_resolver=key_resolver,
+                                 scheme=request.headers.get("sigScheme", "Authorization"))
         if "expectSig" in request.headers:
             self.testcase.assertEqual(request.headers["expectSig"],
                                       HTTPSignatureAuth.get_sig_struct(request)["signature"])
@@ -83,6 +86,12 @@ class TestRequestsHTTPSignature(unittest.TestCase):
             headers = {"Date": date, "pubkey": pubkey_b64, "expectSig": expect_sig, "content-type": "application/json"}
             self.session.post(url, json=payload, headers=headers, auth=auth)
 
+    #def test_signature_scheme(self):
+        auth = HTTPSignatureHeaderAuth(key=hmac_secret,
+                                       key_id="sekret",
+                                       headers=["(request-target)", "host", "date", "digest", "content-length"])
+        self.session.post(url, json=payload, headers={"Date": date, "sigScheme": "Signature"}, auth=auth)
+
     def test_rsa(self):
         from cryptography.hazmat.backends import default_backend
         from cryptography.hazmat.primitives.asymmetric import rsa