moved md5 to slsSupportlib, added md5_helper.c

slsSupportLib/src/md5_helper.cpp

@@ -0,0 +1,28 @@
+#include "sls/md5_helper.h"
+
+#include <iomanip>
+#include <sstream>
+#include <stdexcept>
+
+namespace sls {
+
+std::string md5_calculate_checksum(char *buffer, ssize_t bytes) {
+    MD5_CTX c;
+    if (!MD5_Init(&c)) {
+        throw std::runtime_error(
+            "Could not calculate md5 checksum.[initializing]");
+    }
+    if (!MD5_Update(&c, buffer, bytes)) {
+        throw std::runtime_error("Could not calculate md5 checksum.[Updating]");
+    }
+    unsigned char out[MD5_DIGEST_LENGTH];
+    if (!MD5_Final(out, &c)) {
+        throw std::runtime_error("Could not calculate md5 checksum.[Final]");
+    }
+    std::ostringstream oss;
+    for (int i = 0; i != MD5_DIGEST_LENGTH; ++i)
+        oss << std::hex << std::setw(2) << std::setfill('0') << +out[i];
+    return oss.str();
+}
+
+} // namespace sls