ldap: Use SECPKG_ATTR_SESSION_KEY to retrieve the key size.

libs/ldap/libldap/sasl_w.c

@@ -220,6 +220,14 @@ static int fill_auth_identity( const sasl_interact_t *prompts, SEC_WINNT_AUTH_ID
     return SASL_OK;
 }
 
+static ULONG get_key_size( CtxtHandle *ctx )
+{
+    SecPkgContext_SessionKey key;
+    if (QueryContextAttributesA( ctx, SECPKG_ATTR_SESSION_KEY, &key )) return 0;
+    FreeContextBuffer( key.SessionKey );
+    return key.SessionKeyLength * 8;
+}
+
 int sasl_client_start( sasl_conn_t *handle, const char *mechlist, sasl_interact_t **prompts,
                        const char **clientout, unsigned int *clientoutlen, const char **mech )
 {
@@ -287,14 +295,9 @@ int sasl_client_step( sasl_conn_t *handle, const char *serverin, unsigned int se
         if (status == SEC_I_CONTINUE_NEEDED) return SASL_CONTINUE;
         else
         {
-            SecPkgContext_KeyInfoA key;
             SecPkgContext_Sizes sizes;
 
-            status = QueryContextAttributesA( &conn->ctxt_handle, SECPKG_ATTR_KEY_INFO, &key );
-            if (status != SEC_E_OK) return SASL_FAIL;
-            FreeContextBuffer( key.sSignatureAlgorithmName );
-            FreeContextBuffer( key.sEncryptAlgorithmName );
-            conn->ssf = key.KeySize;
+            conn->ssf = get_key_size( &conn->ctxt_handle );
 
             status = QueryContextAttributesA( &conn->ctxt_handle, SECPKG_ATTR_SIZES, &sizes );
             if (status != SEC_E_OK) return SASL_FAIL;