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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* md-internal.h
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Copyright (C) 2001, 2010, 2022 Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle 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 GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#ifndef NETTLE_MD_INTERNAL_H_INCLUDED
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#define NETTLE_MD_INTERNAL_H_INCLUDED
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#include <string.h>
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/* Internal helper macros for Merkle-Damgård hash functions. Assumes the context
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structs includes the following fields:
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uint8_t block[...]; // Buffer holding one block
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unsigned int index; // Index into block
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*/
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#define MD_FILL_OR_RETURN(ctx, length, data) \
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do { \
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unsigned __md_left = sizeof((ctx)->block) - (ctx)->index; \
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if ((length) < __md_left) \
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{ \
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memcpy((ctx)->block + (ctx)->index, (data), (length)); \
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(ctx)->index += (length); \
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return; \
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} \
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memcpy((ctx)->block + (ctx)->index, (data), __md_left); \
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(data) += __md_left; \
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(length) -= __md_left; \
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} while(0)
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#define MD_FILL_OR_RETURN_INDEX(block_size, block, index, length, data) \
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do { \
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unsigned __md_left = (block_size) - (index); \
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if ((length) < __md_left) \
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{ \
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memcpy(block + (index), (data), (length)); \
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return (index) + (length); \
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} \
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memcpy((block) + (index), (data), __md_left); \
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(data) += __md_left; \
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(length) -= __md_left; \
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} while(0)
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#endif /* NETTLE_MD_INTERNAL_H_INCLUDED */
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