diff --git a/a8/curl.cc b/a8/curl.cc
index fa729a0..b2667e6 100644
--- a/a8/curl.cc
+++ b/a8/curl.cc
@@ -22,12 +22,19 @@ namespace a8
             curl_easy_setopt(curl, CURLOPT_URL, url);
             curl_easy_setopt(curl, CURLOPT_HEADER, 0);
             curl_easy_setopt(curl, CURLOPT_HTTPPOST, 1);
-            curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
+            curl_slist* list = nullptr;
+            if (headers) {
+                list = curl_slist_append(list, headers);
+                curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
+            }
             curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content.c_str());
             curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &_ReceiveResponse);
             curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
             bool ok = curl_easy_perform(curl) == CURLE_OK;
             curl_easy_cleanup(curl);
+            if (list) {
+                curl_slist_free_all(list);
+            }
             return ok;
         }
 
diff --git a/a8/openssl.cc b/a8/openssl.cc
old mode 100644
new mode 100755
index dd73053..4a6a361
--- a/a8/openssl.cc
+++ b/a8/openssl.cc
@@ -134,5 +134,21 @@ namespace a8
             return std::string((char*)md, SHA_DIGEST_LENGTH);
         }
 
+        std::string sha1(std::string& from)
+        {
+            unsigned char digest[SHA_DIGEST_LENGTH];
+            
+            SHA_CTX ctx;
+            SHA1_Init(&ctx);
+            SHA1_Update(&ctx, from.data(), from.size());
+            SHA1_Final(digest, &ctx);
+            
+            char mdString[SHA_DIGEST_LENGTH*2+1];
+            for (int i = 0; i < SHA_DIGEST_LENGTH; i++){
+                sprintf(&mdString[i*2], "%02x", (unsigned int)digest[i]);
+            }
+            return std::string(mdString);
+        }
+
     }
 }
diff --git a/a8/openssl.h b/a8/openssl.h
old mode 100644
new mode 100755
index 73cca53..312843c
--- a/a8/openssl.h
+++ b/a8/openssl.h
@@ -16,6 +16,7 @@ namespace a8
         void Base64Encode(const std::string& from, std::string& to);
 
         std::string Sha1Encode(std::string& from);
+        std::string sha1(std::string& from);
     }
 }