From e5e91ab47107dde8eb66442cf35722b5c2ee89f9 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Sun, 12 Apr 2015 16:34:33 +0100 Subject: [crypto] Add SHA-512/256 algorithm 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 --- src/crypto/sha512_256.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 src/crypto/sha512_256.c (limited to 'src/crypto') diff --git a/src/crypto/sha512_256.c b/src/crypto/sha512_256.c new file mode 100644 index 00000000..f8afaf3e --- /dev/null +++ b/src/crypto/sha512_256.c @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2015 Michael Brown . + * + * 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 +#include +#include +#include +#include + +/** 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 ), +}; -- cgit v1.2.3-55-g7522