211 lines
4.6 KiB
C
211 lines
4.6 KiB
C
/*
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* SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and
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* described at https://tools.ietf.org/html/draft-shen-sm3-hash-01
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*
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* Copyright (C) 2017 ARM Limited or its affiliates.
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* Written by Gilad Ben-Yossef <gilad@benyossef.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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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/types.h>
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#include <crypto/sm3.h>
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#include <crypto/sm3_base.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
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0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
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0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
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0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
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0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
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};
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EXPORT_SYMBOL_GPL(sm3_zero_message_hash);
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static inline u32 p0(u32 x)
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{
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return x ^ rol32(x, 9) ^ rol32(x, 17);
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}
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static inline u32 p1(u32 x)
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{
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return x ^ rol32(x, 15) ^ rol32(x, 23);
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}
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static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c)
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{
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return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c));
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}
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static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g)
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{
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return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g));
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}
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static inline u32 t(unsigned int n)
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{
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return (n < 16) ? SM3_T1 : SM3_T2;
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}
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static void sm3_expand(u32 *t, u32 *w, u32 *wt)
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{
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int i;
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unsigned int tmp;
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/* load the input */
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for (i = 0; i <= 15; i++)
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w[i] = get_unaligned_be32((__u32 *)t + i);
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for (i = 16; i <= 67; i++) {
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tmp = w[i - 16] ^ w[i - 9] ^ rol32(w[i - 3], 15);
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w[i] = p1(tmp) ^ (rol32(w[i - 13], 7)) ^ w[i - 6];
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}
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for (i = 0; i <= 63; i++)
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wt[i] = w[i] ^ w[i + 4];
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}
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static void sm3_compress(u32 *w, u32 *wt, u32 *m)
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{
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u32 ss1;
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u32 ss2;
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u32 tt1;
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u32 tt2;
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u32 a, b, c, d, e, f, g, h;
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int i;
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a = m[0];
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b = m[1];
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c = m[2];
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d = m[3];
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e = m[4];
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f = m[5];
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g = m[6];
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h = m[7];
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for (i = 0; i <= 63; i++) {
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ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i)), 7);
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ss2 = ss1 ^ rol32(a, 12);
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tt1 = ff(i, a, b, c) + d + ss2 + *wt;
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wt++;
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tt2 = gg(i, e, f, g) + h + ss1 + *w;
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w++;
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d = c;
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c = rol32(b, 9);
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b = a;
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a = tt1;
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h = g;
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g = rol32(f, 19);
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f = e;
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e = p0(tt2);
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}
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m[0] = a ^ m[0];
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m[1] = b ^ m[1];
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m[2] = c ^ m[2];
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m[3] = d ^ m[3];
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m[4] = e ^ m[4];
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m[5] = f ^ m[5];
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m[6] = g ^ m[6];
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m[7] = h ^ m[7];
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a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0;
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}
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static void sm3_transform(struct sm3_state *sst, u8 const *src)
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{
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unsigned int w[68];
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unsigned int wt[64];
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sm3_expand((u32 *)src, w, wt);
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sm3_compress(w, wt, sst->state);
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memzero_explicit(w, sizeof(w));
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memzero_explicit(wt, sizeof(wt));
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}
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static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src,
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int blocks)
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{
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while (blocks--) {
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sm3_transform(sst, src);
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src += SM3_BLOCK_SIZE;
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}
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}
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int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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return sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
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}
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EXPORT_SYMBOL(crypto_sm3_update);
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static int sm3_final(struct shash_desc *desc, u8 *out)
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{
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sm3_base_do_finalize(desc, sm3_generic_block_fn);
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return sm3_base_finish(desc, out);
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}
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int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *hash)
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{
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sm3_base_do_update(desc, data, len, sm3_generic_block_fn);
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return sm3_final(desc, hash);
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}
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EXPORT_SYMBOL(crypto_sm3_finup);
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static struct shash_alg sm3_alg = {
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.digestsize = SM3_DIGEST_SIZE,
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.init = sm3_base_init,
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.update = crypto_sm3_update,
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.final = sm3_final,
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.finup = crypto_sm3_finup,
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.descsize = sizeof(struct sm3_state),
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.base = {
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.cra_name = "sm3",
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.cra_driver_name = "sm3-generic",
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.cra_flags = CRYPTO_ALG_TYPE_SHASH,
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.cra_blocksize = SM3_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 sm3_generic_mod_init(void)
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{
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return crypto_register_shash(&sm3_alg);
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}
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static void __exit sm3_generic_mod_fini(void)
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{
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crypto_unregister_shash(&sm3_alg);
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}
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module_init(sm3_generic_mod_init);
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module_exit(sm3_generic_mod_fini);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");
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MODULE_ALIAS_CRYPTO("sm3");
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MODULE_ALIAS_CRYPTO("sm3-generic");
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