Convert Sigalgs processing to use ints

In TLSv1.2 an individual sig alg is represented by 1 byte for the hash
and 1 byte for the signature. In TLSv1.3 each sig alg is represented by
two bytes, where the two bytes together represent a single hash and
signature combination. This converts the internal representation of sigalgs
to use a single int for the pair, rather than a pair of bytes.

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2157)

ssl/ssl_cert.c

diff --git a/ssl/ssl_cert.c b/ssl/ssl_cert.c
index 9668976..bbb6932 100644
--- a/ssl/ssl_cert.c
+++ b/ssl/ssl_cert.c
@@ -141,20 +141,23 @@
 
     /* Configured sigalgs copied across */
     if (cert->conf_sigalgs) {
-        ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen);
+        ret->conf_sigalgs = OPENSSL_malloc(cert->conf_sigalgslen
+                                           * sizeof(*cert->conf_sigalgs));
         if (ret->conf_sigalgs == NULL)
             goto err;
-        memcpy(ret->conf_sigalgs, cert->conf_sigalgs, cert->conf_sigalgslen);
+        memcpy(ret->conf_sigalgs, cert->conf_sigalgs,
+               cert->conf_sigalgslen * sizeof(*cert->conf_sigalgs));
         ret->conf_sigalgslen = cert->conf_sigalgslen;
     } else
         ret->conf_sigalgs = NULL;
 
     if (cert->client_sigalgs) {
-        ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen);
+        ret->client_sigalgs = OPENSSL_malloc(cert->client_sigalgslen
+                                             * sizeof(*cert->client_sigalgs));
         if (ret->client_sigalgs == NULL)
             goto err;
         memcpy(ret->client_sigalgs, cert->client_sigalgs,
-               cert->client_sigalgslen);
+               cert->client_sigalgslen * sizeof(*cert->client_sigalgs));
         ret->client_sigalgslen = cert->client_sigalgslen;
     } else
         ret->client_sigalgs = NULL;