Reogranised usr files and updated readme.

src/shared.cpp

@@ -0,0 +1,42 @@
+#include <string>
+#include <sodium.h>
+
+using namespace std;
+
+namespace shared
+{
+
+string base64_encode(unsigned char *bin, size_t bin_len)
+{
+    const size_t base64_max_len = sodium_base64_encoded_len(bin_len, sodium_base64_VARIANT_ORIGINAL);
+    char base64_str[base64_max_len];
+
+    char *encoded_str_char = sodium_bin2base64(
+        base64_str, base64_max_len,
+        bin, bin_len,
+        sodium_base64_VARIANT_ORIGINAL);
+
+    if (encoded_str_char == NULL)
+        throw "Base64 Error: Failed to encode string";
+
+    string s(base64_str);
+    return s;
+}
+
+int base64_decode(string base64_str, unsigned char *decoded, size_t decoded_len)
+{
+    const char *b64_end;
+    size_t bin_len;
+    if (sodium_base642bin(
+            decoded, decoded_len,
+            base64_str.data(), base64_str.size() + 1,
+            "", &bin_len, &b64_end,
+            sodium_base64_VARIANT_ORIGINAL))
+    {
+        return 0;
+    }
+
+    return 1;
+}
+
+}