Last version before deleting Makefile and CmakeLists.txt

nostr_core/utils.c

@@ -0,0 +1,36 @@
+/*
+ * NOSTR Core Library - Utilities
+ * 
+ * General utility functions used across multiple NIPs
+ */
+
+#include "utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * Convert bytes to hexadecimal string
+ */
+void nostr_bytes_to_hex(const unsigned char* bytes, size_t len, char* hex) {
+    for (size_t i = 0; i < len; i++) {
+        sprintf(hex + i * 2, "%02x", bytes[i]);
+    }
+    hex[len * 2] = '\0';
+}
+
+/**
+ * Convert hexadecimal string to bytes
+ */
+int nostr_hex_to_bytes(const char* hex, unsigned char* bytes, size_t len) {
+    if (strlen(hex) != len * 2) {
+        return -1; // NOSTR_ERROR_INVALID_INPUT
+    }
+    
+    for (size_t i = 0; i < len; i++) {
+        if (sscanf(hex + i * 2, "%02hhx", &bytes[i]) != 1) {
+            return -1; // NOSTR_ERROR_INVALID_INPUT
+        }
+    }
+    return 0; // NOSTR_SUCCESS
+}