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[crypto] Add SHA-512/256 algorithm

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SHA-512/256 is almost identical to SHA-512, with differing initial
hash values and a truncated output length.

This implementation has been verified using the NIST SHA-512/256 test
vectors.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-04-12 16:34:33 +01:00
parent 02879299c9
commit e5e91ab471
4 changed files with 122 additions and 0 deletions
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src/crypto/sha512_256.c Normal file
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/*
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* SHA-512/256 algorithm
*
*/
#include <stdint.h>
#include <byteswap.h>
#include <ipxe/crypto.h>
#include <ipxe/asn1.h>
#include <ipxe/sha512.h>
/** SHA-512/256 initial digest values */
static const struct sha512_digest sha512_256_init_digest = {
.h = {
cpu_to_be64 ( 0x22312194fc2bf72cULL ),
cpu_to_be64 ( 0x9f555fa3c84c64c2ULL ),
cpu_to_be64 ( 0x2393b86b6f53b151ULL ),
cpu_to_be64 ( 0x963877195940eabdULL ),
cpu_to_be64 ( 0x96283ee2a88effe3ULL ),
cpu_to_be64 ( 0xbe5e1e2553863992ULL ),
cpu_to_be64 ( 0x2b0199fc2c85b8aaULL ),
cpu_to_be64 ( 0x0eb72ddc81c52ca2ULL ),
},
};
/**
* Initialise SHA-512/256 algorithm
*
* @v ctx SHA-512/256 context
*/
static void sha512_256_init ( void *ctx ) {
struct sha512_context *context = ctx;
sha512_family_init ( context, &sha512_256_init_digest,
SHA512_256_DIGEST_SIZE );
}
/** SHA-512/256 algorithm */
struct digest_algorithm sha512_256_algorithm = {
.name = "sha512/256",
.ctxsize = sizeof ( struct sha512_context ),
.blocksize = sizeof ( union sha512_block ),
.digestsize = SHA512_256_DIGEST_SIZE,
.init = sha512_256_init,
.update = sha512_update,
.final = sha512_final,
};
/** "sha512_256" object identifier */
static uint8_t oid_sha512_256[] = { ASN1_OID_SHA512_256 };
/** "sha512_256" OID-identified algorithm */
struct asn1_algorithm oid_sha512_256_algorithm __asn1_algorithm = {
.name = "sha512/256",
.digest = &sha512_256_algorithm,
.oid = ASN1_OID_CURSOR ( oid_sha512_256 ),
};