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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and described
* at https://datatracker.ietf.org/doc/html/draft-sca-cfrg-sm3-02
*
* Copyright (C) 2017 ARM Limited or its affiliates.
* Copyright (C) 2017 Gilad Ben-Yossef <gilad@benyossef.com>
* Copyright (C) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
*/
#include <linux/module.h>
#include <linux/unaligned.h>
#include <crypto/sm3.h>
static const u32 ____cacheline_aligned K[64] = {
0x79cc4519, 0xf3988a32, 0xe7311465, 0xce6228cb,
0x9cc45197, 0x3988a32f, 0x7311465e, 0xe6228cbc,
0xcc451979, 0x988a32f3, 0x311465e7, 0x6228cbce,
0xc451979c, 0x88a32f39, 0x11465e73, 0x228cbce6,
0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5,
0x7a879d8a, 0xf50f3b14, 0xea1e7629, 0xd43cec53,
0xa879d8a7, 0x50f3b14f, 0xa1e7629e, 0x43cec53d,
0x879d8a7a, 0x0f3b14f5, 0x1e7629ea, 0x3cec53d4,
0x79d8a7a8, 0xf3b14f50, 0xe7629ea1, 0xcec53d43,
0x9d8a7a87, 0x3b14f50f, 0x7629ea1e, 0xec53d43c,
0xd8a7a879, 0xb14f50f3, 0x629ea1e7, 0xc53d43ce,
0x8a7a879d, 0x14f50f3b, 0x29ea1e76, 0x53d43cec,
0xa7a879d8, 0x4f50f3b1, 0x9ea1e762, 0x3d43cec5
};
/*
* Transform the message X which consists of 16 32-bit-words. See
* GM/T 004-2012 for details.
*/
#define R(i, a, b, c, d, e, f, g, h, t, w1, w2) \
do { \
ss1 = rol32((rol32((a), 12) + (e) + (t)), 7); \
ss2 = ss1 ^ rol32((a), 12); \
d += FF ## i(a, b, c) + ss2 + ((w1) ^ (w2)); \
h += GG ## i(e, f, g) + ss1 + (w1); \
b = rol32((b), 9); \
f = rol32((f), 19); \
h = P0((h)); \
} while (0)
#define R1(a, b, c, d, e, f, g, h, t, w1, w2) \
R(1, a, b, c, d, e, f, g, h, t, w1, w2)
#define R2(a, b, c, d, e, f, g, h, t, w1, w2) \
R(2, a, b, c, d, e, f, g, h, t, w1, w2)
#define FF1(x, y, z) (x ^ y ^ z)
#define FF2(x, y, z) ((x & y) | (x & z) | (y & z))
#define GG1(x, y, z) FF1(x, y, z)
#define GG2(x, y, z) ((x & y) | (~x & z))
/* Message expansion */
#define P0(x) ((x) ^ rol32((x), 9) ^ rol32((x), 17))
#define P1(x) ((x) ^ rol32((x), 15) ^ rol32((x), 23))
#define I(i) (W[i] = get_unaligned_be32(data + i * 4))
#define W1(i) (W[i & 0x0f])
#define W2(i) (W[i & 0x0f] = \
P1(W[i & 0x0f] \
^ W[(i-9) & 0x0f] \
^ rol32(W[(i-3) & 0x0f], 15)) \
^ rol32(W[(i-13) & 0x0f], 7) \
^ W[(i-6) & 0x0f])
static void sm3_transform(struct sm3_state *sctx, u8 const *data, u32 W[16])
{
u32 a, b, c, d, e, f, g, h, ss1, ss2;
a = sctx->state[0];
b = sctx->state[1];
c = sctx->state[2];
d = sctx->state[3];
e = sctx->state[4];
f = sctx->state[5];
g = sctx->state[6];
h = sctx->state[7];
R1(a, b, c, d, e, f, g, h, K[0], I(0), I(4));
R1(d, a, b, c, h, e, f, g, K[1], I(1), I(5));
R1(c, d, a, b, g, h, e, f, K[2], I(2), I(6));
R1(b, c, d, a, f, g, h, e, K[3], I(3), I(7));
R1(a, b, c, d, e, f, g, h, K[4], W1(4), I(8));
R1(d, a, b, c, h, e, f, g, K[5], W1(5), I(9));
R1(c, d, a, b, g, h, e, f, K[6], W1(6), I(10));
R1(b, c, d, a, f, g, h, e, K[7], W1(7), I(11));
R1(a, b, c, d, e, f, g, h, K[8], W1(8), I(12));
R1(d, a, b, c, h, e, f, g, K[9], W1(9), I(13));
R1(c, d, a, b, g, h, e, f, K[10], W1(10), I(14));
R1(b, c, d, a, f, g, h, e, K[11], W1(11), I(15));
R1(a, b, c, d, e, f, g, h, K[12], W1(12), W2(16));
R1(d, a, b, c, h, e, f, g, K[13], W1(13), W2(17));
R1(c, d, a, b, g, h, e, f, K[14], W1(14), W2(18));
R1(b, c, d, a, f, g, h, e, K[15], W1(15), W2(19));
R2(a, b, c, d, e, f, g, h, K[16], W1(16), W2(20));
R2(d, a, b, c, h, e, f, g, K[17], W1(17), W2(21));
R2(c, d, a, b, g, h, e, f, K[18], W1(18), W2(22));
R2(b, c, d, a, f, g, h, e, K[19], W1(19), W2(23));
R2(a, b, c, d, e, f, g, h, K[20], W1(20), W2(24));
R2(d, a, b, c, h, e, f, g, K[21], W1(21), W2(25));
R2(c, d, a, b, g, h, e, f, K[22], W1(22), W2(26));
R2(b, c, d, a, f, g, h, e, K[23], W1(23), W2(27));
R2(a, b, c, d, e, f, g, h, K[24], W1(24), W2(28));
R2(d, a, b, c, h, e, f, g, K[25], W1(25), W2(29));
R2(c, d, a, b, g, h, e, f, K[26], W1(26), W2(30));
R2(b, c, d, a, f, g, h, e, K[27], W1(27), W2(31));
R2(a, b, c, d, e, f, g, h, K[28], W1(28), W2(32));
R2(d, a, b, c, h, e, f, g, K[29], W1(29), W2(33));
R2(c, d, a, b, g, h, e, f, K[30], W1(30), W2(34));
R2(b, c, d, a, f, g, h, e, K[31], W1(31), W2(35));
R2(a, b, c, d, e, f, g, h, K[32], W1(32), W2(36));
R2(d, a, b, c, h, e, f, g, K[33], W1(33), W2(37));
R2(c, d, a, b, g, h, e, f, K[34], W1(34), W2(38));
R2(b, c, d, a, f, g, h, e, K[35], W1(35), W2(39));
R2(a, b, c, d, e, f, g, h, K[36], W1(36), W2(40));
R2(d, a, b, c, h, e, f, g, K[37], W1(37), W2(41));
R2(c, d, a, b, g, h, e, f, K[38], W1(38), W2(42));
R2(b, c, d, a, f, g, h, e, K[39], W1(39), W2(43));
R2(a, b, c, d, e, f, g, h, K[40], W1(40), W2(44));
R2(d, a, b, c, h, e, f, g, K[41], W1(41), W2(45));
R2(c, d, a, b, g, h, e, f, K[42], W1(42), W2(46));
R2(b, c, d, a, f, g, h, e, K[43], W1(43), W2(47));
R2(a, b, c, d, e, f, g, h, K[44], W1(44), W2(48));
R2(d, a, b, c, h, e, f, g, K[45], W1(45), W2(49));
R2(c, d, a, b, g, h, e, f, K[46], W1(46), W2(50));
R2(b, c, d, a, f, g, h, e, K[47], W1(47), W2(51));
R2(a, b, c, d, e, f, g, h, K[48], W1(48), W2(52));
R2(d, a, b, c, h, e, f, g, K[49], W1(49), W2(53));
R2(c, d, a, b, g, h, e, f, K[50], W1(50), W2(54));
R2(b, c, d, a, f, g, h, e, K[51], W1(51), W2(55));
R2(a, b, c, d, e, f, g, h, K[52], W1(52), W2(56));
R2(d, a, b, c, h, e, f, g, K[53], W1(53), W2(57));
R2(c, d, a, b, g, h, e, f, K[54], W1(54), W2(58));
R2(b, c, d, a, f, g, h, e, K[55], W1(55), W2(59));
R2(a, b, c, d, e, f, g, h, K[56], W1(56), W2(60));
R2(d, a, b, c, h, e, f, g, K[57], W1(57), W2(61));
R2(c, d, a, b, g, h, e, f, K[58], W1(58), W2(62));
R2(b, c, d, a, f, g, h, e, K[59], W1(59), W2(63));
R2(a, b, c, d, e, f, g, h, K[60], W1(60), W2(64));
R2(d, a, b, c, h, e, f, g, K[61], W1(61), W2(65));
R2(c, d, a, b, g, h, e, f, K[62], W1(62), W2(66));
R2(b, c, d, a, f, g, h, e, K[63], W1(63), W2(67));
sctx->state[0] ^= a;
sctx->state[1] ^= b;
sctx->state[2] ^= c;
sctx->state[3] ^= d;
sctx->state[4] ^= e;
sctx->state[5] ^= f;
sctx->state[6] ^= g;
sctx->state[7] ^= h;
}
#undef R
#undef R1
#undef R2
#undef I
#undef W1
#undef W2
static inline void sm3_block(struct sm3_state *sctx,
u8 const *data, int blocks, u32 W[16])
{
while (blocks--) {
sm3_transform(sctx, data, W);
data += SM3_BLOCK_SIZE;
}
}
void sm3_update(struct sm3_state *sctx, const u8 *data, unsigned int len)
{
unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
u32 W[16];
sctx->count += len;
if ((partial + len) >= SM3_BLOCK_SIZE) {
int blocks;
if (partial) {
int p = SM3_BLOCK_SIZE - partial;
memcpy(sctx->buffer + partial, data, p);
data += p;
len -= p;
sm3_block(sctx, sctx->buffer, 1, W);
}
blocks = len / SM3_BLOCK_SIZE;
len %= SM3_BLOCK_SIZE;
if (blocks) {
sm3_block(sctx, data, blocks, W);
data += blocks * SM3_BLOCK_SIZE;
}
memzero_explicit(W, sizeof(W));
partial = 0;
}
if (len)
memcpy(sctx->buffer + partial, data, len);
}
EXPORT_SYMBOL_GPL(sm3_update);
void sm3_final(struct sm3_state *sctx, u8 *out)
{
const int bit_offset = SM3_BLOCK_SIZE - sizeof(u64);
__be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
__be32 *digest = (__be32 *)out;
unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
u32 W[16];
int i;
sctx->buffer[partial++] = 0x80;
if (partial > bit_offset) {
memset(sctx->buffer + partial, 0, SM3_BLOCK_SIZE - partial);
partial = 0;
sm3_block(sctx, sctx->buffer, 1, W);
}
memset(sctx->buffer + partial, 0, bit_offset - partial);
*bits = cpu_to_be64(sctx->count << 3);
sm3_block(sctx, sctx->buffer, 1, W);
for (i = 0; i < 8; i++)
put_unaligned_be32(sctx->state[i], digest++);
/* Zeroize sensitive information. */
memzero_explicit(W, sizeof(W));
memzero_explicit(sctx, sizeof(*sctx));
}
EXPORT_SYMBOL_GPL(sm3_final);
MODULE_DESCRIPTION("Generic SM3 library");
MODULE_LICENSE("GPL v2");
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