mirror of
https://github.com/ipxe/ipxe
synced 2026-06-29 00:07:28 +03:00
Michael Brown
327378a764
All of our current digest algorithms (MD4, MD5, SHA-1, and the SHA-2 family) use a Merkle-Damgård construction, with only the compression function, the initial digest values, the field sizes, and the endianness differing between algorithms. Provide a common implementation for Merkle-Damgård hash algorithms to reduce code size. Values are now held as host-endian quantities, with any swapping performed byte-by-byte as data is accumulated (using a compile-time constant that is XORed with the byte index). For the SHA family of algorithms, the values w[] are now calculated iteratively as we progress through the main loop: this substantially reduces the stack space required for the compression function. Signed-off-by: Michael Brown <mcb30@ipxe.org>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/*
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* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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*
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*
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* You can also choose to distribute this program under the terms of
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* the Unmodified Binary Distribution Licence (as given in the file
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* COPYING.UBDL), provided that you have satisfied its requirements.
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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FILE_SECBOOT ( PERMITTED );
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/** @file
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*
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* SHA-224 algorithm
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*
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*/
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#include <ipxe/crypto.h>
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#include <ipxe/sha256.h>
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/** SHA-224 initial digest values */
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static const struct sha256_digest sha224_init = {
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.h = {
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0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
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0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
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}
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};
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/** SHA-224 algorithm */
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SHA256_ALGORITHM ( sha224, sha224_algorithm, sha224_init, SHA224_DIGEST_SIZE );
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