6 /* nettle, low-level cryptographics library
8 * Copyright (C) 2003 Niels Möller
10 * The nettle library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published by
12 * the Free Software Foundation; either version 2.1 of the License, or (at your
13 * option) any later version.
15 * The nettle library is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18 * License for more details.
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with the nettle library; see the file COPYING.LIB. If not, write to
22 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
35 /* Formats the PKCS#1 padding, of the form
37 * 0x01 0xff ... 0xff 0x00 id ...digest...
39 * where the 0xff ... 0xff part consists of at least 8 octets. The
40 * total size should be one less than the octet size of n.
43 pkcs1_signature_prefix(unsigned size,
51 if (size < 10 + id_size + digest_size)
54 j = size - digest_size - id_size;
56 memcpy (buffer + j, id, id_size);
61 memset(buffer + 1, 0xff, j - 1);