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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sha256_base.h (2621B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * sha256_base.h - core logic for SHA-256 implementations
      4 *
      5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
      6 */
      7
      8#ifndef _CRYPTO_SHA256_BASE_H
      9#define _CRYPTO_SHA256_BASE_H
     10
     11#include <crypto/internal/hash.h>
     12#include <crypto/sha2.h>
     13#include <linux/crypto.h>
     14#include <linux/module.h>
     15#include <linux/string.h>
     16
     17#include <asm/unaligned.h>
     18
     19typedef void (sha256_block_fn)(struct sha256_state *sst, u8 const *src,
     20			       int blocks);
     21
     22static inline int sha224_base_init(struct shash_desc *desc)
     23{
     24	struct sha256_state *sctx = shash_desc_ctx(desc);
     25
     26	sha224_init(sctx);
     27	return 0;
     28}
     29
     30static inline int sha256_base_init(struct shash_desc *desc)
     31{
     32	struct sha256_state *sctx = shash_desc_ctx(desc);
     33
     34	sha256_init(sctx);
     35	return 0;
     36}
     37
     38static inline int sha256_base_do_update(struct shash_desc *desc,
     39					const u8 *data,
     40					unsigned int len,
     41					sha256_block_fn *block_fn)
     42{
     43	struct sha256_state *sctx = shash_desc_ctx(desc);
     44	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
     45
     46	sctx->count += len;
     47
     48	if (unlikely((partial + len) >= SHA256_BLOCK_SIZE)) {
     49		int blocks;
     50
     51		if (partial) {
     52			int p = SHA256_BLOCK_SIZE - partial;
     53
     54			memcpy(sctx->buf + partial, data, p);
     55			data += p;
     56			len -= p;
     57
     58			block_fn(sctx, sctx->buf, 1);
     59		}
     60
     61		blocks = len / SHA256_BLOCK_SIZE;
     62		len %= SHA256_BLOCK_SIZE;
     63
     64		if (blocks) {
     65			block_fn(sctx, data, blocks);
     66			data += blocks * SHA256_BLOCK_SIZE;
     67		}
     68		partial = 0;
     69	}
     70	if (len)
     71		memcpy(sctx->buf + partial, data, len);
     72
     73	return 0;
     74}
     75
     76static inline int sha256_base_do_finalize(struct shash_desc *desc,
     77					  sha256_block_fn *block_fn)
     78{
     79	const int bit_offset = SHA256_BLOCK_SIZE - sizeof(__be64);
     80	struct sha256_state *sctx = shash_desc_ctx(desc);
     81	__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
     82	unsigned int partial = sctx->count % SHA256_BLOCK_SIZE;
     83
     84	sctx->buf[partial++] = 0x80;
     85	if (partial > bit_offset) {
     86		memset(sctx->buf + partial, 0x0, SHA256_BLOCK_SIZE - partial);
     87		partial = 0;
     88
     89		block_fn(sctx, sctx->buf, 1);
     90	}
     91
     92	memset(sctx->buf + partial, 0x0, bit_offset - partial);
     93	*bits = cpu_to_be64(sctx->count << 3);
     94	block_fn(sctx, sctx->buf, 1);
     95
     96	return 0;
     97}
     98
     99static inline int sha256_base_finish(struct shash_desc *desc, u8 *out)
    100{
    101	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
    102	struct sha256_state *sctx = shash_desc_ctx(desc);
    103	__be32 *digest = (__be32 *)out;
    104	int i;
    105
    106	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be32))
    107		put_unaligned_be32(sctx->state[i], digest++);
    108
    109	memzero_explicit(sctx, sizeof(*sctx));
    110	return 0;
    111}
    112
    113#endif /* _CRYPTO_SHA256_BASE_H */