f43c239407
Memset on a local variable may be removed when it is called just before the variable goes out of scope. Using memzero_explicit defeats this optimization. A simplified version of the semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier x; type T; @@ { ... when any T x[...]; ... when any when exists - memset + memzero_explicit (x, -0, ...) ... when != x when strict } // </smpl> This change was suggested by Daniel Borkmann <dborkman@redhat.com> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
306 lines
8.2 KiB
C
306 lines
8.2 KiB
C
/*
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* Glue code for the SHA512 Secure Hash Algorithm assembly implementation
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* using NEON instructions.
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*
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* Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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*
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* This file is based on sha512_ssse3_glue.c:
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* Copyright (C) 2013 Intel Corporation
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* Author: Tim Chen <tim.c.chen@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/cryptohash.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <crypto/sha.h>
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#include <asm/byteorder.h>
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#include <asm/simd.h>
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#include <asm/neon.h>
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static const u64 sha512_k[] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL,
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0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
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0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
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0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
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0xd807aa98a3030242ULL, 0x12835b0145706fbeULL,
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0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL,
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0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
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0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
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0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
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0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL,
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0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
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0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL,
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0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
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0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
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0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
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0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL,
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0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
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0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL,
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0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
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0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
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0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
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0xd192e819d6ef5218ULL, 0xd69906245565a910ULL,
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0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
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0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL,
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0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
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0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
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0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
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0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL,
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0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
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0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL,
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0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
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0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
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0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
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0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL,
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0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
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0x28db77f523047d84ULL, 0x32caab7b40c72493ULL,
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0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
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0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
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0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
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};
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asmlinkage void sha512_transform_neon(u64 *digest, const void *data,
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const u64 k[], unsigned int num_blks);
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static int sha512_neon_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA512_H0;
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sctx->state[1] = SHA512_H1;
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sctx->state[2] = SHA512_H2;
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sctx->state[3] = SHA512_H3;
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sctx->state[4] = SHA512_H4;
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sctx->state[5] = SHA512_H5;
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sctx->state[6] = SHA512_H6;
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sctx->state[7] = SHA512_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static int __sha512_neon_update(struct shash_desc *desc, const u8 *data,
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unsigned int len, unsigned int partial)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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unsigned int done = 0;
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sctx->count[0] += len;
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if (sctx->count[0] < len)
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sctx->count[1]++;
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if (partial) {
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done = SHA512_BLOCK_SIZE - partial;
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memcpy(sctx->buf + partial, data, done);
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sha512_transform_neon(sctx->state, sctx->buf, sha512_k, 1);
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}
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if (len - done >= SHA512_BLOCK_SIZE) {
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const unsigned int rounds = (len - done) / SHA512_BLOCK_SIZE;
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sha512_transform_neon(sctx->state, data + done, sha512_k,
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rounds);
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done += rounds * SHA512_BLOCK_SIZE;
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}
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memcpy(sctx->buf, data + done, len - done);
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return 0;
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}
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static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
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int res;
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/* Handle the fast case right here */
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if (partial + len < SHA512_BLOCK_SIZE) {
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sctx->count[0] += len;
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if (sctx->count[0] < len)
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sctx->count[1]++;
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memcpy(sctx->buf + partial, data, len);
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return 0;
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}
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if (!may_use_simd()) {
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res = crypto_sha512_update(desc, data, len);
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} else {
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kernel_neon_begin();
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res = __sha512_neon_update(desc, data, len, partial);
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kernel_neon_end();
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}
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return res;
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}
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/* Add padding and return the message digest. */
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static int sha512_neon_final(struct shash_desc *desc, u8 *out)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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unsigned int i, index, padlen;
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__be64 *dst = (__be64 *)out;
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__be64 bits[2];
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static const u8 padding[SHA512_BLOCK_SIZE] = { 0x80, };
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/* save number of bits */
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bits[1] = cpu_to_be64(sctx->count[0] << 3);
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bits[0] = cpu_to_be64(sctx->count[1] << 3 | sctx->count[0] >> 61);
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/* Pad out to 112 mod 128 and append length */
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index = sctx->count[0] & 0x7f;
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padlen = (index < 112) ? (112 - index) : ((128+112) - index);
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if (!may_use_simd()) {
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crypto_sha512_update(desc, padding, padlen);
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crypto_sha512_update(desc, (const u8 *)&bits, sizeof(bits));
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} else {
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kernel_neon_begin();
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/* We need to fill a whole block for __sha512_neon_update() */
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if (padlen <= 112) {
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sctx->count[0] += padlen;
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if (sctx->count[0] < padlen)
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sctx->count[1]++;
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memcpy(sctx->buf + index, padding, padlen);
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} else {
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__sha512_neon_update(desc, padding, padlen, index);
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}
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__sha512_neon_update(desc, (const u8 *)&bits,
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sizeof(bits), 112);
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kernel_neon_end();
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}
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/* Store state in digest */
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for (i = 0; i < 8; i++)
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dst[i] = cpu_to_be64(sctx->state[i]);
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/* Wipe context */
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memset(sctx, 0, sizeof(*sctx));
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return 0;
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}
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static int sha512_neon_export(struct shash_desc *desc, void *out)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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memcpy(out, sctx, sizeof(*sctx));
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return 0;
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}
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static int sha512_neon_import(struct shash_desc *desc, const void *in)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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memcpy(sctx, in, sizeof(*sctx));
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return 0;
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}
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static int sha384_neon_init(struct shash_desc *desc)
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{
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struct sha512_state *sctx = shash_desc_ctx(desc);
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sctx->state[0] = SHA384_H0;
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sctx->state[1] = SHA384_H1;
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sctx->state[2] = SHA384_H2;
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sctx->state[3] = SHA384_H3;
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sctx->state[4] = SHA384_H4;
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sctx->state[5] = SHA384_H5;
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sctx->state[6] = SHA384_H6;
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sctx->state[7] = SHA384_H7;
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sctx->count[0] = sctx->count[1] = 0;
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return 0;
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}
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static int sha384_neon_final(struct shash_desc *desc, u8 *hash)
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{
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u8 D[SHA512_DIGEST_SIZE];
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sha512_neon_final(desc, D);
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memcpy(hash, D, SHA384_DIGEST_SIZE);
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memzero_explicit(D, SHA512_DIGEST_SIZE);
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return 0;
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}
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static struct shash_alg algs[] = { {
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.digestsize = SHA512_DIGEST_SIZE,
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.init = sha512_neon_init,
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.update = sha512_neon_update,
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.final = sha512_neon_final,
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.export = sha512_neon_export,
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.import = sha512_neon_import,
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.descsize = sizeof(struct sha512_state),
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.statesize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha512",
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.cra_driver_name = "sha512-neon",
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.cra_priority = 250,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA512_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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}, {
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.digestsize = SHA384_DIGEST_SIZE,
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.init = sha384_neon_init,
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.update = sha512_neon_update,
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.final = sha384_neon_final,
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.export = sha512_neon_export,
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.import = sha512_neon_import,
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.descsize = sizeof(struct sha512_state),
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.statesize = sizeof(struct sha512_state),
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.base = {
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.cra_name = "sha384",
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.cra_driver_name = "sha384-neon",
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.cra_priority = 250,
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SHA384_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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} };
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static int __init sha512_neon_mod_init(void)
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{
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if (!cpu_has_neon())
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return -ENODEV;
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return crypto_register_shashes(algs, ARRAY_SIZE(algs));
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}
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static void __exit sha512_neon_mod_fini(void)
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{
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crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
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}
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module_init(sha512_neon_mod_init);
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module_exit(sha512_neon_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("SHA512 Secure Hash Algorithm, NEON accelerated");
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MODULE_ALIAS_CRYPTO("sha512");
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MODULE_ALIAS_CRYPTO("sha384");
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