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99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*
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This file is part of Pretty Curved Privacy (pcp1).
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Copyright (C) 2013 T.Linden.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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You can contact me by mail: <tlinden AT cpan DOT org>.
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*/
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#ifndef _HAVE_PCP_ZPADDING
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#define _HAVE_PCP_ZPADDING
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <limits.h>
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#include "mem.h"
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#ifdef DEBUG
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#define ZPADCHAR 48
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#else
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#define ZPADCHAR 0
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#endif
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/* prepends a binary stream with a number of */
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/* \0's as required by the secret_box and */
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/* secret_box_open functions of libsodium. */
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/* */
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/* parameters: */
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/* */
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/* padded: destination array (ref) */
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/* unpadded: source array without padding */
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/* padlen: length of padding */
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/* unpadlen: length of source array */
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/* */
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/* turns "efa5" into "00000000efa5" with padlen 8 */
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/* */
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/* if DEBUG is set, destination will be padded with */
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/* the character '0', NOT the integer 0. */
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/* */
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/* allocates memory for padded and it is up to the */
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/* user to free it after use. */
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/* */
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/* sample call: */
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/* */
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/* char unpadded[] = {0xef, 0xa5}; */
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/* byte *padded; */
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/* pcp_pad_prepend(&padded, unpadded, 8, 2); */
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/* */
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/* the result, padded, would be 10 bytes long, 8 */
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/* bytes for the leading zeros and 2 for the content */
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/* of the original unpadded. */
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void pcp_pad_prepend(byte **padded, byte *unpadded,
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size_t padlen, size_t unpadlen);
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/* removes zero's of a binary stream, which is */
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/* the reverse of pcp_pad_prepend(). */
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/* */
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/* parameters: */
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/* */
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/* unpadded: destination array (ref), with padding removed */
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/* padded: source array with padding */
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/* padlen: length of padding */
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/* unpadlen: length of source array */
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/* */
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/* turns "00000000efa5" into "efa5" with padlen 8 */
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/* */
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/* allocates memory for unpadded and it is up to the */
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/* user to free it after use. */
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/* */
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/* sample call: */
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/* */
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/* char padded[] = {0x0, 0x0, 0x0, 0x0, 0xef, 0xa5}; */
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/* byte *unpadded; */
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/* pcp_pad_remove(unpadded, padded, 4, 2); */
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/* */
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/* the result, unpadded would be 2 bytes long containing */
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/* only the 2 bytes we want to have with zeros removed. */
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void pcp_pad_remove(byte **unpadded, byte *padded,
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size_t padlen, size_t unpadlen);
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#endif /* _HAVE_PCP_ZPADDING */
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