From 964c26eb326dc26c032a3ccba10cb6d376bb3cf4 Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sun, 26 Apr 2026 07:38:43 +0200
Subject: lib: Add CRC-8 and CRC-16 checksums

These checksum will be handy for header checksums.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
---
 src/lib/hash.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'src/lib/hash.c')

diff --git a/src/lib/hash.c b/src/lib/hash.c
index f32001d9..7ffa5bc1 100644
--- a/src/lib/hash.c
+++ b/src/lib/hash.c
@@ -39,6 +39,8 @@
 #include <ouroboros/md5.h>
 #include <ouroboros/sha3.h>
 #endif
+#include <ouroboros/crc8.h>
+#include <ouroboros/crc16.h>
 #include <ouroboros/crc64.h>
 #include <string.h>
 #include <assert.h>
@@ -70,6 +72,10 @@ int hash_len_tbl [] = {
 
 uint16_t hash_len(enum hash_algo algo)
 {
+        if (algo == HASH_CRC8)
+                return CRC8_HASH_LEN;
+        if (algo == HASH_CRC16)
+                return CRC16_HASH_LEN;
         if (algo == HASH_CRC64)
                 return CRC64_HASH_LEN;
 #ifdef HAVE_LIBGCRYPT
@@ -84,6 +90,20 @@ void mem_hash(enum hash_algo  algo,
               const uint8_t * buf,
               size_t          len)
 {
+        if (algo == HASH_CRC8) {
+                uint8_t crc = 0;
+
+                crc8_autosar(&crc, buf, len);
+                *(uint8_t *) dst = crc;
+                return;
+        }
+        if (algo == HASH_CRC16) {
+                uint16_t crc = 0;
+
+                crc16_ccitt_false(&crc, buf, len);
+                *(uint16_t *) dst = htobe16(crc);
+                return;
+        }
         if (algo == HASH_CRC64) {
                 uint64_t crc = 0;
 
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