sb_new = silc_buffer_alloc(newsize);
silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
silc_buffer_put(sb_new, sb->head, sb->truelen);
sb_new = silc_buffer_alloc(newsize);
silc_buffer_pull_tail(sb_new, SILC_BUFFER_END(sb_new));
silc_buffer_put(sb_new, sb->head, sb->truelen);