Fix SM4-CCM bug in length encoding

guanzhi · Apr 21, 2024 · a485fa0 · a485fa0
1 parent afd9682
commit a485fa0
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/sm4_ccm.c b/src/sm4_ccm.c
@@ -18,7 +18,7 @@
 
 static void length_to_bytes(size_t len, size_t nbytes, uint8_t *out)
 {
-	uint8_t *p = out + nbytes;
+	uint8_t *p = out + nbytes - 1;
 	while (nbytes--) {
 		*p-- = len & 0xff;
 		len >>= 8;