From 763b5e2c4bed507e0fa34ca2b7cb4f15a136cb82 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 19:35:01 +0200 Subject: Adding upstream version 4.0. Signed-off-by: Daniel Baumann --- cmac_nettle.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 cmac_nettle.c (limited to 'cmac_nettle.c') diff --git a/cmac_nettle.c b/cmac_nettle.c new file mode 100644 index 0000000..5b2c0d4 --- /dev/null +++ b/cmac_nettle.c @@ -0,0 +1,117 @@ +/* + chronyd/chronyc - Programs for keeping computer clocks accurate. + + ********************************************************************** + * Copyright (C) Miroslav Lichvar 2019 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * 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. + * + ********************************************************************** + + ======================================================================= + + Support for AES128 and AES256 CMAC in Nettle. + + */ + +#include "config.h" + +#include "sysincl.h" + +#include + +#include "cmac.h" +#include "memory.h" + +struct CMC_Instance_Record { + int key_length; + union { + struct cmac_aes128_ctx aes128; + struct cmac_aes256_ctx aes256; + } context; +}; + +/* ================================================== */ + +int +CMC_GetKeyLength(CMC_Algorithm algorithm) +{ + if (algorithm == CMC_AES128) + return AES128_KEY_SIZE; + else if (algorithm == CMC_AES256) + return AES256_KEY_SIZE; + return 0; +} + +/* ================================================== */ + +CMC_Instance +CMC_CreateInstance(CMC_Algorithm algorithm, const unsigned char *key, int length) +{ + CMC_Instance inst; + + if (length <= 0 || length != CMC_GetKeyLength(algorithm)) + return NULL; + + inst = MallocNew(struct CMC_Instance_Record); + inst->key_length = length; + + switch (length) { + case AES128_KEY_SIZE: + cmac_aes128_set_key(&inst->context.aes128, key); + break; + case AES256_KEY_SIZE: + cmac_aes256_set_key(&inst->context.aes256, key); + break; + default: + assert(0); + } + + return inst; +} + +/* ================================================== */ + +int +CMC_Hash(CMC_Instance inst, const void *in, int in_len, unsigned char *out, int out_len) +{ + if (in_len < 0 || out_len < 0) + return 0; + + if (out_len > CMAC128_DIGEST_SIZE) + out_len = CMAC128_DIGEST_SIZE; + + switch (inst->key_length) { + case AES128_KEY_SIZE: + cmac_aes128_update(&inst->context.aes128, in_len, in); + cmac_aes128_digest(&inst->context.aes128, out_len, out); + break; + case AES256_KEY_SIZE: + cmac_aes256_update(&inst->context.aes256, in_len, in); + cmac_aes256_digest(&inst->context.aes256, out_len, out); + break; + default: + assert(0); + } + + return out_len; +} + +/* ================================================== */ + +void +CMC_DestroyInstance(CMC_Instance inst) +{ + Free(inst); +} -- cgit v1.2.3