cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sm3_base.h (2608B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * sm3_base.h - core logic for SM3 implementations
      4 *
      5 * Copyright (C) 2017 ARM Limited or its affiliates.
      6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
      7 */
      8
      9#ifndef _CRYPTO_SM3_BASE_H
     10#define _CRYPTO_SM3_BASE_H
     11
     12#include <crypto/internal/hash.h>
     13#include <crypto/sm3.h>
     14#include <linux/crypto.h>
     15#include <linux/module.h>
     16#include <linux/string.h>
     17#include <asm/unaligned.h>
     18
     19typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
     20
     21static inline int sm3_base_init(struct shash_desc *desc)
     22{
     23	struct sm3_state *sctx = shash_desc_ctx(desc);
     24
     25	sctx->state[0] = SM3_IVA;
     26	sctx->state[1] = SM3_IVB;
     27	sctx->state[2] = SM3_IVC;
     28	sctx->state[3] = SM3_IVD;
     29	sctx->state[4] = SM3_IVE;
     30	sctx->state[5] = SM3_IVF;
     31	sctx->state[6] = SM3_IVG;
     32	sctx->state[7] = SM3_IVH;
     33	sctx->count = 0;
     34
     35	return 0;
     36}
     37
     38static inline int sm3_base_do_update(struct shash_desc *desc,
     39				      const u8 *data,
     40				      unsigned int len,
     41				      sm3_block_fn *block_fn)
     42{
     43	struct sm3_state *sctx = shash_desc_ctx(desc);
     44	unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
     45
     46	sctx->count += len;
     47
     48	if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
     49		int blocks;
     50
     51		if (partial) {
     52			int p = SM3_BLOCK_SIZE - partial;
     53
     54			memcpy(sctx->buffer + partial, data, p);
     55			data += p;
     56			len -= p;
     57
     58			block_fn(sctx, sctx->buffer, 1);
     59		}
     60
     61		blocks = len / SM3_BLOCK_SIZE;
     62		len %= SM3_BLOCK_SIZE;
     63
     64		if (blocks) {
     65			block_fn(sctx, data, blocks);
     66			data += blocks * SM3_BLOCK_SIZE;
     67		}
     68		partial = 0;
     69	}
     70	if (len)
     71		memcpy(sctx->buffer + partial, data, len);
     72
     73	return 0;
     74}
     75
     76static inline int sm3_base_do_finalize(struct shash_desc *desc,
     77					sm3_block_fn *block_fn)
     78{
     79	const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
     80	struct sm3_state *sctx = shash_desc_ctx(desc);
     81	__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
     82	unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
     83
     84	sctx->buffer[partial++] = 0x80;
     85	if (partial > bit_offset) {
     86		memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
     87		partial = 0;
     88
     89		block_fn(sctx, sctx->buffer, 1);
     90	}
     91
     92	memset(sctx->buffer + partial, 0x0, bit_offset - partial);
     93	*bits = cpu_to_be64(sctx->count << 3);
     94	block_fn(sctx, sctx->buffer, 1);
     95
     96	return 0;
     97}
     98
     99static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
    100{
    101	struct sm3_state *sctx = shash_desc_ctx(desc);
    102	__be32 *digest = (__be32 *)out;
    103	int i;
    104
    105	for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
    106		put_unaligned_be32(sctx->state[i], digest++);
    107
    108	memzero_explicit(sctx, sizeof(*sctx));
    109	return 0;
    110}
    111
    112#endif /* _CRYPTO_SM3_BASE_H */