[Feature] Add function to generate random hex string

2 files changed, 26 insertions, 0 deletions

diff --git a/src/libutil/util.c b/src/libutil/util.c
index 4ce90ba06..212cb7f1b 100644
--- a/src/libutil/util.c
+++ b/src/libutil/util.c
@@ -1875,6 +1875,25 @@ randombytes (guchar *buf, guint64 len)
 	ottery_rand_bytes (buf, (size_t)len);
 }
 
+void
+rspamd_random_hex (guchar *buf, guint64 len)
+{
+	static const gchar hexdigests[16] = "0123456789abcdef";
+	gint64 i;
+
+	g_assert (len > 0);
+
+	ottery_rand_bytes (buf, (len / 2.0 + 0.5));
+
+	for (i = (gint64)len - 1; i >= 0; i -= 2) {
+		buf[i] = hexdigests[buf[i / 2] & 0xf];
+
+		if (i > 0) {
+			buf[i - 1] = hexdigests[(buf[i / 2] >> 4) & 0xf];
+		}
+	}
+}
+
 
 void
 rspamd_ptr_array_free_hard (gpointer p)
diff --git a/src/libutil/util.h b/src/libutil/util.h
index 48e91cb4f..5c0e82a0d 100644
--- a/src/libutil/util.h
+++ b/src/libutil/util.h
@@ -405,6 +405,13 @@ void rspamd_deinit_libs (struct rspamd_external_libs_ctx *ctx);
 guint64 rspamd_hash_seed (void);
 
 /**
+ * Returns random hex string of the specified length
+ * @param buf
+ * @param len
+ */
+void rspamd_random_hex (guchar *buf, guint64 len);
+
+/**
  * Return jittered time value
  */
 gdouble rspamd_time_jitter (gdouble in, gdouble jitter);