X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilccrypt%2Fsilchmac.c;h=d3484983c7ce2f0d39fae90c744d79e5232714f7;hb=789adec4bf1addc3ef7fb47d6370f5b3fe308376;hp=1edfb3813049610adf3f17f67cc704ea9a2b2b77;hpb=4760d6aa6c3248d7e6757d2e7e7a19a834b2dc34;p=silc.git

diff --git a/lib/silccrypt/silchmac.c b/lib/silccrypt/silchmac.c
index 1edfb381..d3484983 100644
--- a/lib/silccrypt/silchmac.c
+++ b/lib/silccrypt/silchmac.c
@@ -190,6 +190,10 @@ char *silc_hmac_get_supported()
 void silc_hmac_set_key(SilcHmac hmac, const unsigned char *key,
 		       unsigned int key_len)
 {
+  if (hmac->key) {
+    memset(hmac->key, 0, hmac->key_len);
+    silc_free(hmac->key);
+  }
   hmac->key = silc_calloc(key_len, sizeof(unsigned char));
   hmac->key_len = key_len;
   memcpy(hmac->key, key, key_len);