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/* pkcs1.c
*
* PKCS1 embedding.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2003 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <string.h>
#include "pkcs1.h"
/* Formats the PKCS#1 padding, of the form
*
* 0x01 0xff ... 0xff 0x00 id
*
* where the 0xff ... 0xff part consists of at least 8 octets.
*/
void
pkcs1_signature_prefix(unsigned length,
uint8_t *buffer,
unsigned id_length,
const uint8_t *id)
{
assert(length >= id_length);
length -= id_length;
memcpy(buffer + length, id, id_length);
assert(length);
buffer[--length] = 0;
assert(length >= 9);
memset(buffer + 1, 0xff, length - 1);
buffer[0] = 1;
}
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