Implement sig_hashes
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index 554a552..457362f 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -211,7 +211,7 @@
      *
      * So, just look at the HashAlgorithm part.
      */
-    for( md_cur = mbedtls_md_list(); *md_cur != MBEDTLS_MD_NONE; md_cur++ ) {
+    for( md_cur = ssl->conf->sig_hashes; *md_cur != MBEDTLS_MD_NONE; md_cur++ ) {
         for( p = buf + 2; p < end; p += 2 ) {
             if( *md_cur == (int) mbedtls_ssl_md_alg_from_hash( p[0] ) ) {
                 ssl->handshake->sig_alg = p[0];