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.c (3191B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Cryptographic API.
      4 *
      5 * powerpc implementation of the SHA1 Secure Hash Algorithm.
      6 *
      7 * Derived from cryptoapi implementation, adapted for in-place
      8 * scatterlist interface.
      9 *
     10 * Derived from "crypto/sha1.c"
     11 * Copyright (c) Alan Smithee.
     12 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
     13 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
     14 */
     15#include <crypto/internal/hash.h>
     16#include <linux/init.h>
     17#include <linux/module.h>
     18#include <linux/mm.h>
     19#include <linux/types.h>
     20#include <crypto/sha1.h>
     21#include <crypto/sha1_base.h>
     22#include <asm/byteorder.h>
     23
     24void powerpc_sha_transform(u32 *state, const u8 *src);
     25
     26static int powerpc_sha1_update(struct shash_desc *desc, const u8 *data,
     27			       unsigned int len)
     28{
     29	struct sha1_state *sctx = shash_desc_ctx(desc);
     30	unsigned int partial, done;
     31	const u8 *src;
     32
     33	partial = sctx->count & 0x3f;
     34	sctx->count += len;
     35	done = 0;
     36	src = data;
     37
     38	if ((partial + len) > 63) {
     39
     40		if (partial) {
     41			done = -partial;
     42			memcpy(sctx->buffer + partial, data, done + 64);
     43			src = sctx->buffer;
     44		}
     45
     46		do {
     47			powerpc_sha_transform(sctx->state, src);
     48			done += 64;
     49			src = data + done;
     50		} while (done + 63 < len);
     51
     52		partial = 0;
     53	}
     54	memcpy(sctx->buffer + partial, src, len - done);
     55
     56	return 0;
     57}
     58
     59
     60/* Add padding and return the message digest. */
     61static int powerpc_sha1_final(struct shash_desc *desc, u8 *out)
     62{
     63	struct sha1_state *sctx = shash_desc_ctx(desc);
     64	__be32 *dst = (__be32 *)out;
     65	u32 i, index, padlen;
     66	__be64 bits;
     67	static const u8 padding[64] = { 0x80, };
     68
     69	bits = cpu_to_be64(sctx->count << 3);
     70
     71	/* Pad out to 56 mod 64 */
     72	index = sctx->count & 0x3f;
     73	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
     74	powerpc_sha1_update(desc, padding, padlen);
     75
     76	/* Append length */
     77	powerpc_sha1_update(desc, (const u8 *)&bits, sizeof(bits));
     78
     79	/* Store state in digest */
     80	for (i = 0; i < 5; i++)
     81		dst[i] = cpu_to_be32(sctx->state[i]);
     82
     83	/* Wipe context */
     84	memset(sctx, 0, sizeof *sctx);
     85
     86	return 0;
     87}
     88
     89static int powerpc_sha1_export(struct shash_desc *desc, void *out)
     90{
     91	struct sha1_state *sctx = shash_desc_ctx(desc);
     92
     93	memcpy(out, sctx, sizeof(*sctx));
     94	return 0;
     95}
     96
     97static int powerpc_sha1_import(struct shash_desc *desc, const void *in)
     98{
     99	struct sha1_state *sctx = shash_desc_ctx(desc);
    100
    101	memcpy(sctx, in, sizeof(*sctx));
    102	return 0;
    103}
    104
    105static struct shash_alg alg = {
    106	.digestsize	=	SHA1_DIGEST_SIZE,
    107	.init		=	sha1_base_init,
    108	.update		=	powerpc_sha1_update,
    109	.final		=	powerpc_sha1_final,
    110	.export		=	powerpc_sha1_export,
    111	.import		=	powerpc_sha1_import,
    112	.descsize	=	sizeof(struct sha1_state),
    113	.statesize	=	sizeof(struct sha1_state),
    114	.base		=	{
    115		.cra_name	=	"sha1",
    116		.cra_driver_name=	"sha1-powerpc",
    117		.cra_blocksize	=	SHA1_BLOCK_SIZE,
    118		.cra_module	=	THIS_MODULE,
    119	}
    120};
    121
    122static int __init sha1_powerpc_mod_init(void)
    123{
    124	return crypto_register_shash(&alg);
    125}
    126
    127static void __exit sha1_powerpc_mod_fini(void)
    128{
    129	crypto_unregister_shash(&alg);
    130}
    131
    132module_init(sha1_powerpc_mod_init);
    133module_exit(sha1_powerpc_mod_fini);
    134
    135MODULE_LICENSE("GPL");
    136MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
    137
    138MODULE_ALIAS_CRYPTO("sha1");
    139MODULE_ALIAS_CRYPTO("sha1-powerpc");