Ensure EVP_MAC_update() passes the length even if it is 0

[openssl.git] / providers / implementations / macs / siphash_prov.c

diff --git a/providers/implementations/macs/siphash_prov.c b/providers/implementations/macs/siphash_prov.c
index 8797241e33b6af3e0e379edee956db7e44958460..1bea7a2787773aa2dcbc0a276c6e2e97df4da8a1 100644 (file)
--- a/providers/implementations/macs/siphash_prov.c
+++ b/providers/implementations/macs/siphash_prov.c
@@ -91,6 +91,9 @@ static int siphash_update(void *vmacctx, const unsigned char *data,
 {
     struct siphash_data_st *ctx = vmacctx;
 
+    if (datalen == 0)
+        return 1;
+
     SipHash_Update(&ctx->siphash, data, datalen);
     return 1;
 }