/* * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01 * * Copyright (C) 2017 ARM Limited or its affiliates. * Written by Gilad Ben-Yossef <gilad@benyossef.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include <crypto/internal/hash.h> #include <linux/init.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/types.h> #include <crypto/sm3.h> #include <crypto/sm3_base.h> #include <linux/bitops.h> #include <asm/byteorder.h> #include <asm/unaligned.h> const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = { 0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F, 0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F, 0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74, 0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B }; EXPORT_SYMBOL_GPL(sm3_zero_message_hash); static inline u32 p0(u32 x) { return x ^ rol32(x, 9) ^ rol32(x, 17); } static inline u32 p1(u32 x) { return x ^ rol32(x, 15) ^ rol32(x, 23); } static inline u32 ff(unsigned int n, u32 a, u32 b, u32 c) { return (n < 16) ? (a ^ b ^ c) : ((a & b) | (a & c) | (b & c)); } static inline u32 gg(unsigned int n, u32 e, u32 f, u32 g) { return (n < 16) ? (e ^ f ^ g) : ((e & f) | ((~e) & g)); } static inline u32 t(unsigned int n) { return (n < 16) ? SM3_T1 : SM3_T2; } static void sm3_expand(u32 *t, u32 *w, u32 *wt) { int i; unsigned int tmp; /* load the input */ for (i = 0; i <= 15; i++) w[i] = get_unaligned_be32((__u32 *)t + i); for (i = 16; i <= 67; i++) { tmp = w[i - 16] ^ w[i - 9] ^ rol32(w[i - 3], 15); w[i] = p1(tmp) ^ (rol32(w[i - 13], 7)) ^ w[i - 6]; } for (i = 0; i <= 63; i++) wt[i] = w[i] ^ w[i + 4]; } static void sm3_compress(u32 *w, u32 *wt, u32 *m) { u32 ss1; u32 ss2; u32 tt1; u32 tt2; u32 a, b, c, d, e, f, g, h; int i; a = m[0]; b = m[1]; c = m[2]; d = m[3]; e = m[4]; f = m[5]; g = m[6]; h = m[7]; for (i = 0; i <= 63; i++) { ss1 = rol32((rol32(a, 12) + e + rol32(t(i), i & 31)), 7); ss2 = ss1 ^ rol32(a, 12); tt1 = ff(i, a, b, c) + d + ss2 + *wt; wt++; tt2 = gg(i, e, f, g) + h + ss1 + *w; w++; d = c; c = rol32(b, 9); b = a; a = tt1; h = g; g = rol32(f, 19); f = e; e = p0(tt2); } m[0] = a ^ m[0]; m[1] = b ^ m[1]; m[2] = c ^ m[2]; m[3] = d ^ m[3]; m[4] = e ^ m[4]; m[5] = f ^ m[5]; m[6] = g ^ m[6]; m[7] = h ^ m[7]; a = b = c = d = e = f = g = h = ss1 = ss2 = tt1 = tt2 = 0; } static void sm3_transform(struct sm3_state *sst, u8 const *src) { unsigned int w[68]; unsigned int wt[64]; sm3_expand((u32 *)src, w, wt); sm3_compress(w, wt, sst->state); memzero_explicit(w, sizeof(w)); memzero_explicit(wt, sizeof(wt)); } static void sm3_generic_block_fn(struct sm3_state *sst, u8 const *src, int blocks) { while (blocks--) { sm3_transform(sst, src); src += SM3_BLOCK_SIZE; } } int crypto_sm3_update(struct shash_desc *desc, const u8 *data, unsigned int len) { return sm3_base_do_update(desc, data, len, sm3_generic_block_fn); } EXPORT_SYMBOL(crypto_sm3_update); static int sm3_final(struct shash_desc *desc, u8 *out) { sm3_base_do_finalize(desc, sm3_generic_block_fn); return sm3_base_finish(desc, out); } int crypto_sm3_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *hash) { sm3_base_do_update(desc, data, len, sm3_generic_block_fn); return sm3_final(desc, hash); } EXPORT_SYMBOL(crypto_sm3_finup); static struct shash_alg sm3_alg = { .digestsize = SM3_DIGEST_SIZE, .init = sm3_base_init, .update = crypto_sm3_update, .final = sm3_final, .finup = crypto_sm3_finup, .descsize = sizeof(struct sm3_state), .base = { .cra_name = "sm3", .cra_driver_name = "sm3-generic", .cra_blocksize = SM3_BLOCK_SIZE, .cra_module = THIS_MODULE, } }; static int __init sm3_generic_mod_init(void) { return crypto_register_shash(&sm3_alg); } static void __exit sm3_generic_mod_fini(void) { crypto_unregister_shash(&sm3_alg); } subsys_initcall(sm3_generic_mod_init); module_exit(sm3_generic_mod_fini); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("SM3 Secure Hash Algorithm"); MODULE_ALIAS_CRYPTO("sm3"); MODULE_ALIAS_CRYPTO("sm3-generic");