1 files changed, 40 insertions, 0 deletions
diff --git a/util/src/id.c b/util/src/id.c
new file mode 100644
index 0000000..48bed23
--- /dev/null
+++ b/util/src/id.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <openssl/rand.h>
+
+#define IDLN 8
+#define CHARSET \
+    "abcdefghijklmnopqrstuvwxyz" \
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+    "0123456789" \
+    "-_!~"
+#define CHARSETLN (sizeof(CHARSET) - 1)
+
+char* gen() {
+    char* id = malloc(IDLN + 1);
+    if (id == NULL) {
+        perror("malloc");
+        exit(1);
+    }
+
+    unsigned char buf[IDLN];
+    if (RAND_bytes(buf, IDLN) != 1) {
+        perror("RAND_bytes");
+        free(id);
+        exit(1);
+    }
+
+    for (
+        int i = 0;
+        i < IDLN || (id[IDLN] = '\0');
+        id[i++] = CHARSET[buf[i] % CHARSETLN]
+    );
+
+    return id;
+}
+
+int main(void) {
+    char* id = gen();
+    printf("%s", id);
+    free(id);
+}