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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sha1_glue.c (4410B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Glue code for SHA1 hashing optimized for sparc64 crypto opcodes.
      3 *
      4 * This is based largely upon arch/x86/crypto/sha1_ssse3_glue.c
      5 *
      6 * Copyright (c) Alan Smithee.
      7 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
      8 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
      9 * Copyright (c) Mathias Krause <minipli@googlemail.com>
     10 */
     11
     12#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
     13
     14#include <crypto/internal/hash.h>
     15#include <linux/init.h>
     16#include <linux/module.h>
     17#include <linux/mm.h>
     18#include <linux/types.h>
     19#include <crypto/sha1.h>
     20#include <crypto/sha1_base.h>
     21
     22#include <asm/pstate.h>
     23#include <asm/elf.h>
     24
     25#include "opcodes.h"
     26
     27asmlinkage void sha1_sparc64_transform(u32 *digest, const char *data,
     28				       unsigned int rounds);
     29
     30static void __sha1_sparc64_update(struct sha1_state *sctx, const u8 *data,
     31				  unsigned int len, unsigned int partial)
     32{
     33	unsigned int done = 0;
     34
     35	sctx->count += len;
     36	if (partial) {
     37		done = SHA1_BLOCK_SIZE - partial;
     38		memcpy(sctx->buffer + partial, data, done);
     39		sha1_sparc64_transform(sctx->state, sctx->buffer, 1);
     40	}
     41	if (len - done >= SHA1_BLOCK_SIZE) {
     42		const unsigned int rounds = (len - done) / SHA1_BLOCK_SIZE;
     43
     44		sha1_sparc64_transform(sctx->state, data + done, rounds);
     45		done += rounds * SHA1_BLOCK_SIZE;
     46	}
     47
     48	memcpy(sctx->buffer, data + done, len - done);
     49}
     50
     51static int sha1_sparc64_update(struct shash_desc *desc, const u8 *data,
     52			       unsigned int len)
     53{
     54	struct sha1_state *sctx = shash_desc_ctx(desc);
     55	unsigned int partial = sctx->count % SHA1_BLOCK_SIZE;
     56
     57	/* Handle the fast case right here */
     58	if (partial + len < SHA1_BLOCK_SIZE) {
     59		sctx->count += len;
     60		memcpy(sctx->buffer + partial, data, len);
     61	} else
     62		__sha1_sparc64_update(sctx, data, len, partial);
     63
     64	return 0;
     65}
     66
     67/* Add padding and return the message digest. */
     68static int sha1_sparc64_final(struct shash_desc *desc, u8 *out)
     69{
     70	struct sha1_state *sctx = shash_desc_ctx(desc);
     71	unsigned int i, index, padlen;
     72	__be32 *dst = (__be32 *)out;
     73	__be64 bits;
     74	static const u8 padding[SHA1_BLOCK_SIZE] = { 0x80, };
     75
     76	bits = cpu_to_be64(sctx->count << 3);
     77
     78	/* Pad out to 56 mod 64 and append length */
     79	index = sctx->count % SHA1_BLOCK_SIZE;
     80	padlen = (index < 56) ? (56 - index) : ((SHA1_BLOCK_SIZE+56) - index);
     81
     82	/* We need to fill a whole block for __sha1_sparc64_update() */
     83	if (padlen <= 56) {
     84		sctx->count += padlen;
     85		memcpy(sctx->buffer + index, padding, padlen);
     86	} else {
     87		__sha1_sparc64_update(sctx, padding, padlen, index);
     88	}
     89	__sha1_sparc64_update(sctx, (const u8 *)&bits, sizeof(bits), 56);
     90
     91	/* Store state in digest */
     92	for (i = 0; i < 5; i++)
     93		dst[i] = cpu_to_be32(sctx->state[i]);
     94
     95	/* Wipe context */
     96	memset(sctx, 0, sizeof(*sctx));
     97
     98	return 0;
     99}
    100
    101static int sha1_sparc64_export(struct shash_desc *desc, void *out)
    102{
    103	struct sha1_state *sctx = shash_desc_ctx(desc);
    104
    105	memcpy(out, sctx, sizeof(*sctx));
    106
    107	return 0;
    108}
    109
    110static int sha1_sparc64_import(struct shash_desc *desc, const void *in)
    111{
    112	struct sha1_state *sctx = shash_desc_ctx(desc);
    113
    114	memcpy(sctx, in, sizeof(*sctx));
    115
    116	return 0;
    117}
    118
    119static struct shash_alg alg = {
    120	.digestsize	=	SHA1_DIGEST_SIZE,
    121	.init		=	sha1_base_init,
    122	.update		=	sha1_sparc64_update,
    123	.final		=	sha1_sparc64_final,
    124	.export		=	sha1_sparc64_export,
    125	.import		=	sha1_sparc64_import,
    126	.descsize	=	sizeof(struct sha1_state),
    127	.statesize	=	sizeof(struct sha1_state),
    128	.base		=	{
    129		.cra_name	=	"sha1",
    130		.cra_driver_name=	"sha1-sparc64",
    131		.cra_priority	=	SPARC_CR_OPCODE_PRIORITY,
    132		.cra_blocksize	=	SHA1_BLOCK_SIZE,
    133		.cra_module	=	THIS_MODULE,
    134	}
    135};
    136
    137static bool __init sparc64_has_sha1_opcode(void)
    138{
    139	unsigned long cfr;
    140
    141	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
    142		return false;
    143
    144	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
    145	if (!(cfr & CFR_SHA1))
    146		return false;
    147
    148	return true;
    149}
    150
    151static int __init sha1_sparc64_mod_init(void)
    152{
    153	if (sparc64_has_sha1_opcode()) {
    154		pr_info("Using sparc64 sha1 opcode optimized SHA-1 implementation\n");
    155		return crypto_register_shash(&alg);
    156	}
    157	pr_info("sparc64 sha1 opcode not available.\n");
    158	return -ENODEV;
    159}
    160
    161static void __exit sha1_sparc64_mod_fini(void)
    162{
    163	crypto_unregister_shash(&alg);
    164}
    165
    166module_init(sha1_sparc64_mod_init);
    167module_exit(sha1_sparc64_mod_fini);
    168
    169MODULE_LICENSE("GPL");
    170MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, sparc64 sha1 opcode accelerated");
    171
    172MODULE_ALIAS_CRYPTO("sha1");
    173
    174#include "crop_devid.c"