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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sha512_base.h (3255B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * sha512_base.h - core logic for SHA-512 implementations
      4 *
      5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
      6 */
      7
      8#ifndef _CRYPTO_SHA512_BASE_H
      9#define _CRYPTO_SHA512_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 (sha512_block_fn)(struct sha512_state *sst, u8 const *src,
     20			       int blocks);
     21
     22static inline int sha384_base_init(struct shash_desc *desc)
     23{
     24	struct sha512_state *sctx = shash_desc_ctx(desc);
     25
     26	sctx->state[0] = SHA384_H0;
     27	sctx->state[1] = SHA384_H1;
     28	sctx->state[2] = SHA384_H2;
     29	sctx->state[3] = SHA384_H3;
     30	sctx->state[4] = SHA384_H4;
     31	sctx->state[5] = SHA384_H5;
     32	sctx->state[6] = SHA384_H6;
     33	sctx->state[7] = SHA384_H7;
     34	sctx->count[0] = sctx->count[1] = 0;
     35
     36	return 0;
     37}
     38
     39static inline int sha512_base_init(struct shash_desc *desc)
     40{
     41	struct sha512_state *sctx = shash_desc_ctx(desc);
     42
     43	sctx->state[0] = SHA512_H0;
     44	sctx->state[1] = SHA512_H1;
     45	sctx->state[2] = SHA512_H2;
     46	sctx->state[3] = SHA512_H3;
     47	sctx->state[4] = SHA512_H4;
     48	sctx->state[5] = SHA512_H5;
     49	sctx->state[6] = SHA512_H6;
     50	sctx->state[7] = SHA512_H7;
     51	sctx->count[0] = sctx->count[1] = 0;
     52
     53	return 0;
     54}
     55
     56static inline int sha512_base_do_update(struct shash_desc *desc,
     57					const u8 *data,
     58					unsigned int len,
     59					sha512_block_fn *block_fn)
     60{
     61	struct sha512_state *sctx = shash_desc_ctx(desc);
     62	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
     63
     64	sctx->count[0] += len;
     65	if (sctx->count[0] < len)
     66		sctx->count[1]++;
     67
     68	if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
     69		int blocks;
     70
     71		if (partial) {
     72			int p = SHA512_BLOCK_SIZE - partial;
     73
     74			memcpy(sctx->buf + partial, data, p);
     75			data += p;
     76			len -= p;
     77
     78			block_fn(sctx, sctx->buf, 1);
     79		}
     80
     81		blocks = len / SHA512_BLOCK_SIZE;
     82		len %= SHA512_BLOCK_SIZE;
     83
     84		if (blocks) {
     85			block_fn(sctx, data, blocks);
     86			data += blocks * SHA512_BLOCK_SIZE;
     87		}
     88		partial = 0;
     89	}
     90	if (len)
     91		memcpy(sctx->buf + partial, data, len);
     92
     93	return 0;
     94}
     95
     96static inline int sha512_base_do_finalize(struct shash_desc *desc,
     97					  sha512_block_fn *block_fn)
     98{
     99	const int bit_offset = SHA512_BLOCK_SIZE - sizeof(__be64[2]);
    100	struct sha512_state *sctx = shash_desc_ctx(desc);
    101	__be64 *bits = (__be64 *)(sctx->buf + bit_offset);
    102	unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
    103
    104	sctx->buf[partial++] = 0x80;
    105	if (partial > bit_offset) {
    106		memset(sctx->buf + partial, 0x0, SHA512_BLOCK_SIZE - partial);
    107		partial = 0;
    108
    109		block_fn(sctx, sctx->buf, 1);
    110	}
    111
    112	memset(sctx->buf + partial, 0x0, bit_offset - partial);
    113	bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
    114	bits[1] = cpu_to_be64(sctx->count[0] << 3);
    115	block_fn(sctx, sctx->buf, 1);
    116
    117	return 0;
    118}
    119
    120static inline int sha512_base_finish(struct shash_desc *desc, u8 *out)
    121{
    122	unsigned int digest_size = crypto_shash_digestsize(desc->tfm);
    123	struct sha512_state *sctx = shash_desc_ctx(desc);
    124	__be64 *digest = (__be64 *)out;
    125	int i;
    126
    127	for (i = 0; digest_size > 0; i++, digest_size -= sizeof(__be64))
    128		put_unaligned_be64(sctx->state[i], digest++);
    129
    130	memzero_explicit(sctx, sizeof(*sctx));
    131	return 0;
    132}
    133
    134#endif /* _CRYPTO_SHA512_BASE_H */