xref: /aosp_15_r20/external/vboot_reference/firmware/2lib/2sha256.c (revision 8617a60d3594060b7ecbd21bc622a7c14f3cf2bc)
1*8617a60dSAndroid Build Coastguard Worker /* Copyright 2021 The ChromiumOS Authors
2*8617a60dSAndroid Build Coastguard Worker  * Use of this source code is governed by a BSD-style license that can be
3*8617a60dSAndroid Build Coastguard Worker  * found in the LICENSE file.
4*8617a60dSAndroid Build Coastguard Worker  */
5*8617a60dSAndroid Build Coastguard Worker 
6*8617a60dSAndroid Build Coastguard Worker /* SHA-256 and SHA-512 implementation based on code by Oliver Gay
7*8617a60dSAndroid Build Coastguard Worker  * <[email protected]> under a BSD-style license. See below.
8*8617a60dSAndroid Build Coastguard Worker  */
9*8617a60dSAndroid Build Coastguard Worker 
10*8617a60dSAndroid Build Coastguard Worker /*
11*8617a60dSAndroid Build Coastguard Worker  * FIPS 180-2 SHA-224/256/384/512 implementation
12*8617a60dSAndroid Build Coastguard Worker  * Last update: 02/02/2007
13*8617a60dSAndroid Build Coastguard Worker  * Issue date:  04/30/2005
14*8617a60dSAndroid Build Coastguard Worker  *
15*8617a60dSAndroid Build Coastguard Worker  * Copyright (C) 2005, 2007 Olivier Gay <[email protected]>
16*8617a60dSAndroid Build Coastguard Worker  * All rights reserved.
17*8617a60dSAndroid Build Coastguard Worker  *
18*8617a60dSAndroid Build Coastguard Worker  * Redistribution and use in source and binary forms, with or without
19*8617a60dSAndroid Build Coastguard Worker  * modification, are permitted provided that the following conditions
20*8617a60dSAndroid Build Coastguard Worker  * are met:
21*8617a60dSAndroid Build Coastguard Worker  * 1. Redistributions of source code must retain the above copyright
22*8617a60dSAndroid Build Coastguard Worker  *    notice, this list of conditions and the following disclaimer.
23*8617a60dSAndroid Build Coastguard Worker  * 2. Redistributions in binary form must reproduce the above copyright
24*8617a60dSAndroid Build Coastguard Worker  *    notice, this list of conditions and the following disclaimer in the
25*8617a60dSAndroid Build Coastguard Worker  *    documentation and/or other materials provided with the distribution.
26*8617a60dSAndroid Build Coastguard Worker  * 3. Neither the name of the project nor the names of its contributors
27*8617a60dSAndroid Build Coastguard Worker  *    may be used to endorse or promote products derived from this software
28*8617a60dSAndroid Build Coastguard Worker  *    without specific prior written permission.
29*8617a60dSAndroid Build Coastguard Worker  *
30*8617a60dSAndroid Build Coastguard Worker  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
31*8617a60dSAndroid Build Coastguard Worker  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32*8617a60dSAndroid Build Coastguard Worker  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33*8617a60dSAndroid Build Coastguard Worker  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
34*8617a60dSAndroid Build Coastguard Worker  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35*8617a60dSAndroid Build Coastguard Worker  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36*8617a60dSAndroid Build Coastguard Worker  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37*8617a60dSAndroid Build Coastguard Worker  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38*8617a60dSAndroid Build Coastguard Worker  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39*8617a60dSAndroid Build Coastguard Worker  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40*8617a60dSAndroid Build Coastguard Worker  * SUCH DAMAGE.
41*8617a60dSAndroid Build Coastguard Worker  */
42*8617a60dSAndroid Build Coastguard Worker 
43*8617a60dSAndroid Build Coastguard Worker #include "2common.h"
44*8617a60dSAndroid Build Coastguard Worker #include "2sha.h"
45*8617a60dSAndroid Build Coastguard Worker #include "2sha_private.h"
46*8617a60dSAndroid Build Coastguard Worker #include "2sysincludes.h"
47*8617a60dSAndroid Build Coastguard Worker 
48*8617a60dSAndroid Build Coastguard Worker #define SHFR(x, n)    (x >> n)
49*8617a60dSAndroid Build Coastguard Worker #define ROTR(x, n)   ((x >> n) | (x << ((sizeof(x) << 3) - n)))
50*8617a60dSAndroid Build Coastguard Worker #define ROTL(x, n)   ((x << n) | (x >> ((sizeof(x) << 3) - n)))
51*8617a60dSAndroid Build Coastguard Worker #define CH(x, y, z)  ((x & y) ^ (~x & z))
52*8617a60dSAndroid Build Coastguard Worker #define MAJ(x, y, z) ((x & y) ^ (x & z) ^ (y & z))
53*8617a60dSAndroid Build Coastguard Worker 
54*8617a60dSAndroid Build Coastguard Worker #define SHA256_F1(x) (ROTR(x,  2) ^ ROTR(x, 13) ^ ROTR(x, 22))
55*8617a60dSAndroid Build Coastguard Worker #define SHA256_F2(x) (ROTR(x,  6) ^ ROTR(x, 11) ^ ROTR(x, 25))
56*8617a60dSAndroid Build Coastguard Worker #define SHA256_F3(x) (ROTR(x,  7) ^ ROTR(x, 18) ^ SHFR(x,  3))
57*8617a60dSAndroid Build Coastguard Worker #define SHA256_F4(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHFR(x, 10))
58*8617a60dSAndroid Build Coastguard Worker 
59*8617a60dSAndroid Build Coastguard Worker /* Macros used for loops unrolling */
60*8617a60dSAndroid Build Coastguard Worker 
61*8617a60dSAndroid Build Coastguard Worker #define SHA256_SCR(i)						\
62*8617a60dSAndroid Build Coastguard Worker 	{							\
63*8617a60dSAndroid Build Coastguard Worker 		w[i] =  SHA256_F4(w[i -  2]) + w[i -  7]	\
64*8617a60dSAndroid Build Coastguard Worker 			+ SHA256_F3(w[i - 15]) + w[i - 16];	\
65*8617a60dSAndroid Build Coastguard Worker 	}
66*8617a60dSAndroid Build Coastguard Worker 
67*8617a60dSAndroid Build Coastguard Worker #define SHA256_EXP(a, b, c, d, e, f, g, h, j)				\
68*8617a60dSAndroid Build Coastguard Worker 	{								\
69*8617a60dSAndroid Build Coastguard Worker 		t1 = wv[h] + SHA256_F2(wv[e]) + CH(wv[e], wv[f], wv[g]) \
70*8617a60dSAndroid Build Coastguard Worker 			+ vb2_sha256_k[j] + w[j];				\
71*8617a60dSAndroid Build Coastguard Worker 		t2 = SHA256_F1(wv[a]) + MAJ(wv[a], wv[b], wv[c]);       \
72*8617a60dSAndroid Build Coastguard Worker 		wv[d] += t1;                                            \
73*8617a60dSAndroid Build Coastguard Worker 		wv[h] = t1 + t2;                                        \
74*8617a60dSAndroid Build Coastguard Worker 	}
75*8617a60dSAndroid Build Coastguard Worker 
76*8617a60dSAndroid Build Coastguard Worker const uint32_t vb2_sha256_h0[8] = {
77*8617a60dSAndroid Build Coastguard Worker 	0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
78*8617a60dSAndroid Build Coastguard Worker 	0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
79*8617a60dSAndroid Build Coastguard Worker };
80*8617a60dSAndroid Build Coastguard Worker 
81*8617a60dSAndroid Build Coastguard Worker static const uint32_t sha224_h0[8] = {
82*8617a60dSAndroid Build Coastguard Worker 	0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
83*8617a60dSAndroid Build Coastguard Worker 	0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4
84*8617a60dSAndroid Build Coastguard Worker };
85*8617a60dSAndroid Build Coastguard Worker 
86*8617a60dSAndroid Build Coastguard Worker const uint32_t vb2_sha256_k[64] = {
87*8617a60dSAndroid Build Coastguard Worker 	0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
88*8617a60dSAndroid Build Coastguard Worker 	0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
89*8617a60dSAndroid Build Coastguard Worker 	0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
90*8617a60dSAndroid Build Coastguard Worker 	0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
91*8617a60dSAndroid Build Coastguard Worker 	0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
92*8617a60dSAndroid Build Coastguard Worker 	0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
93*8617a60dSAndroid Build Coastguard Worker 	0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
94*8617a60dSAndroid Build Coastguard Worker 	0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
95*8617a60dSAndroid Build Coastguard Worker 	0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
96*8617a60dSAndroid Build Coastguard Worker 	0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
97*8617a60dSAndroid Build Coastguard Worker 	0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
98*8617a60dSAndroid Build Coastguard Worker 	0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
99*8617a60dSAndroid Build Coastguard Worker 	0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
100*8617a60dSAndroid Build Coastguard Worker 	0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
101*8617a60dSAndroid Build Coastguard Worker 	0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
102*8617a60dSAndroid Build Coastguard Worker 	0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
103*8617a60dSAndroid Build Coastguard Worker };
104*8617a60dSAndroid Build Coastguard Worker 
105*8617a60dSAndroid Build Coastguard Worker /* SHA-256 implementation */
vb2_sha256_init(struct vb2_sha256_context * ctx,enum vb2_hash_algorithm algo)106*8617a60dSAndroid Build Coastguard Worker void vb2_sha256_init(struct vb2_sha256_context *ctx,
107*8617a60dSAndroid Build Coastguard Worker 		     enum vb2_hash_algorithm algo)
108*8617a60dSAndroid Build Coastguard Worker {
109*8617a60dSAndroid Build Coastguard Worker 	const uint32_t *h0 = algo == VB2_HASH_SHA224 ? sha224_h0 : vb2_sha256_h0;
110*8617a60dSAndroid Build Coastguard Worker 
111*8617a60dSAndroid Build Coastguard Worker #ifndef UNROLL_LOOPS
112*8617a60dSAndroid Build Coastguard Worker 	int i;
113*8617a60dSAndroid Build Coastguard Worker 	for (i = 0; i < 8; i++) {
114*8617a60dSAndroid Build Coastguard Worker 		ctx->h[i] = h0[i];
115*8617a60dSAndroid Build Coastguard Worker 	}
116*8617a60dSAndroid Build Coastguard Worker #else
117*8617a60dSAndroid Build Coastguard Worker 	ctx->h[0] = h0[0]; ctx->h[1] = h0[1];
118*8617a60dSAndroid Build Coastguard Worker 	ctx->h[2] = h0[2]; ctx->h[3] = h0[3];
119*8617a60dSAndroid Build Coastguard Worker 	ctx->h[4] = h0[4]; ctx->h[5] = h0[5];
120*8617a60dSAndroid Build Coastguard Worker 	ctx->h[6] = h0[6]; ctx->h[7] = h0[7];
121*8617a60dSAndroid Build Coastguard Worker #endif /* !UNROLL_LOOPS */
122*8617a60dSAndroid Build Coastguard Worker 
123*8617a60dSAndroid Build Coastguard Worker 	ctx->size = 0;
124*8617a60dSAndroid Build Coastguard Worker 	ctx->total_size = 0;
125*8617a60dSAndroid Build Coastguard Worker }
126*8617a60dSAndroid Build Coastguard Worker 
vb2_sha256_transform(struct vb2_sha256_context * ctx,const uint8_t * message,unsigned int block_nb)127*8617a60dSAndroid Build Coastguard Worker static void vb2_sha256_transform(struct vb2_sha256_context *ctx,
128*8617a60dSAndroid Build Coastguard Worker 				 const uint8_t *message,
129*8617a60dSAndroid Build Coastguard Worker 				 unsigned int block_nb)
130*8617a60dSAndroid Build Coastguard Worker {
131*8617a60dSAndroid Build Coastguard Worker 	/* Note that these arrays use 72*4=288 bytes of stack */
132*8617a60dSAndroid Build Coastguard Worker 	uint32_t w[64];
133*8617a60dSAndroid Build Coastguard Worker 	uint32_t wv[8];
134*8617a60dSAndroid Build Coastguard Worker 	uint32_t t1, t2;
135*8617a60dSAndroid Build Coastguard Worker 	const unsigned char *sub_block;
136*8617a60dSAndroid Build Coastguard Worker 	int i;
137*8617a60dSAndroid Build Coastguard Worker 
138*8617a60dSAndroid Build Coastguard Worker #ifndef UNROLL_LOOPS
139*8617a60dSAndroid Build Coastguard Worker 	int j;
140*8617a60dSAndroid Build Coastguard Worker #endif
141*8617a60dSAndroid Build Coastguard Worker 
142*8617a60dSAndroid Build Coastguard Worker 	for (i = 0; i < (int) block_nb; i++) {
143*8617a60dSAndroid Build Coastguard Worker 		sub_block = message + (i << 6);
144*8617a60dSAndroid Build Coastguard Worker 
145*8617a60dSAndroid Build Coastguard Worker #ifndef UNROLL_LOOPS
146*8617a60dSAndroid Build Coastguard Worker 		for (j = 0; j < 16; j++) {
147*8617a60dSAndroid Build Coastguard Worker 			PACK32(&sub_block[j << 2], &w[j]);
148*8617a60dSAndroid Build Coastguard Worker 		}
149*8617a60dSAndroid Build Coastguard Worker 
150*8617a60dSAndroid Build Coastguard Worker 		for (j = 16; j < 64; j++) {
151*8617a60dSAndroid Build Coastguard Worker 			SHA256_SCR(j);
152*8617a60dSAndroid Build Coastguard Worker 		}
153*8617a60dSAndroid Build Coastguard Worker 
154*8617a60dSAndroid Build Coastguard Worker 		for (j = 0; j < 8; j++) {
155*8617a60dSAndroid Build Coastguard Worker 			wv[j] = ctx->h[j];
156*8617a60dSAndroid Build Coastguard Worker 		}
157*8617a60dSAndroid Build Coastguard Worker 
158*8617a60dSAndroid Build Coastguard Worker 		for (j = 0; j < 64; j++) {
159*8617a60dSAndroid Build Coastguard Worker 			t1 = wv[7] + SHA256_F2(wv[4]) + CH(wv[4], wv[5], wv[6])
160*8617a60dSAndroid Build Coastguard Worker 				+ vb2_sha256_k[j] + w[j];
161*8617a60dSAndroid Build Coastguard Worker 			t2 = SHA256_F1(wv[0]) + MAJ(wv[0], wv[1], wv[2]);
162*8617a60dSAndroid Build Coastguard Worker 			wv[7] = wv[6];
163*8617a60dSAndroid Build Coastguard Worker 			wv[6] = wv[5];
164*8617a60dSAndroid Build Coastguard Worker 			wv[5] = wv[4];
165*8617a60dSAndroid Build Coastguard Worker 			wv[4] = wv[3] + t1;
166*8617a60dSAndroid Build Coastguard Worker 			wv[3] = wv[2];
167*8617a60dSAndroid Build Coastguard Worker 			wv[2] = wv[1];
168*8617a60dSAndroid Build Coastguard Worker 			wv[1] = wv[0];
169*8617a60dSAndroid Build Coastguard Worker 			wv[0] = t1 + t2;
170*8617a60dSAndroid Build Coastguard Worker 		}
171*8617a60dSAndroid Build Coastguard Worker 
172*8617a60dSAndroid Build Coastguard Worker 		for (j = 0; j < 8; j++) {
173*8617a60dSAndroid Build Coastguard Worker 			ctx->h[j] += wv[j];
174*8617a60dSAndroid Build Coastguard Worker 		}
175*8617a60dSAndroid Build Coastguard Worker #else
176*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[ 0], &w[ 0]); PACK32(&sub_block[ 4], &w[ 1]);
177*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[ 8], &w[ 2]); PACK32(&sub_block[12], &w[ 3]);
178*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[16], &w[ 4]); PACK32(&sub_block[20], &w[ 5]);
179*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[24], &w[ 6]); PACK32(&sub_block[28], &w[ 7]);
180*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[32], &w[ 8]); PACK32(&sub_block[36], &w[ 9]);
181*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[40], &w[10]); PACK32(&sub_block[44], &w[11]);
182*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[48], &w[12]); PACK32(&sub_block[52], &w[13]);
183*8617a60dSAndroid Build Coastguard Worker 		PACK32(&sub_block[56], &w[14]); PACK32(&sub_block[60], &w[15]);
184*8617a60dSAndroid Build Coastguard Worker 
185*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(16); SHA256_SCR(17); SHA256_SCR(18); SHA256_SCR(19);
186*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(20); SHA256_SCR(21); SHA256_SCR(22); SHA256_SCR(23);
187*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(24); SHA256_SCR(25); SHA256_SCR(26); SHA256_SCR(27);
188*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(28); SHA256_SCR(29); SHA256_SCR(30); SHA256_SCR(31);
189*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(32); SHA256_SCR(33); SHA256_SCR(34); SHA256_SCR(35);
190*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(36); SHA256_SCR(37); SHA256_SCR(38); SHA256_SCR(39);
191*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(40); SHA256_SCR(41); SHA256_SCR(42); SHA256_SCR(43);
192*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(44); SHA256_SCR(45); SHA256_SCR(46); SHA256_SCR(47);
193*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(48); SHA256_SCR(49); SHA256_SCR(50); SHA256_SCR(51);
194*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(52); SHA256_SCR(53); SHA256_SCR(54); SHA256_SCR(55);
195*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(56); SHA256_SCR(57); SHA256_SCR(58); SHA256_SCR(59);
196*8617a60dSAndroid Build Coastguard Worker 		SHA256_SCR(60); SHA256_SCR(61); SHA256_SCR(62); SHA256_SCR(63);
197*8617a60dSAndroid Build Coastguard Worker 
198*8617a60dSAndroid Build Coastguard Worker 		wv[0] = ctx->h[0]; wv[1] = ctx->h[1];
199*8617a60dSAndroid Build Coastguard Worker 		wv[2] = ctx->h[2]; wv[3] = ctx->h[3];
200*8617a60dSAndroid Build Coastguard Worker 		wv[4] = ctx->h[4]; wv[5] = ctx->h[5];
201*8617a60dSAndroid Build Coastguard Worker 		wv[6] = ctx->h[6]; wv[7] = ctx->h[7];
202*8617a60dSAndroid Build Coastguard Worker 
203*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7, 0); SHA256_EXP(7,0,1,2,3,4,5,6, 1);
204*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5, 2); SHA256_EXP(5,6,7,0,1,2,3,4, 3);
205*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3, 4); SHA256_EXP(3,4,5,6,7,0,1,2, 5);
206*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1, 6); SHA256_EXP(1,2,3,4,5,6,7,0, 7);
207*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7, 8); SHA256_EXP(7,0,1,2,3,4,5,6, 9);
208*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,10); SHA256_EXP(5,6,7,0,1,2,3,4,11);
209*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,12); SHA256_EXP(3,4,5,6,7,0,1,2,13);
210*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,14); SHA256_EXP(1,2,3,4,5,6,7,0,15);
211*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,16); SHA256_EXP(7,0,1,2,3,4,5,6,17);
212*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,18); SHA256_EXP(5,6,7,0,1,2,3,4,19);
213*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,20); SHA256_EXP(3,4,5,6,7,0,1,2,21);
214*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,22); SHA256_EXP(1,2,3,4,5,6,7,0,23);
215*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,24); SHA256_EXP(7,0,1,2,3,4,5,6,25);
216*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,26); SHA256_EXP(5,6,7,0,1,2,3,4,27);
217*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,28); SHA256_EXP(3,4,5,6,7,0,1,2,29);
218*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,30); SHA256_EXP(1,2,3,4,5,6,7,0,31);
219*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,32); SHA256_EXP(7,0,1,2,3,4,5,6,33);
220*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,34); SHA256_EXP(5,6,7,0,1,2,3,4,35);
221*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,36); SHA256_EXP(3,4,5,6,7,0,1,2,37);
222*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,38); SHA256_EXP(1,2,3,4,5,6,7,0,39);
223*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,40); SHA256_EXP(7,0,1,2,3,4,5,6,41);
224*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,42); SHA256_EXP(5,6,7,0,1,2,3,4,43);
225*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,44); SHA256_EXP(3,4,5,6,7,0,1,2,45);
226*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,46); SHA256_EXP(1,2,3,4,5,6,7,0,47);
227*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,48); SHA256_EXP(7,0,1,2,3,4,5,6,49);
228*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,50); SHA256_EXP(5,6,7,0,1,2,3,4,51);
229*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,52); SHA256_EXP(3,4,5,6,7,0,1,2,53);
230*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,54); SHA256_EXP(1,2,3,4,5,6,7,0,55);
231*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(0,1,2,3,4,5,6,7,56); SHA256_EXP(7,0,1,2,3,4,5,6,57);
232*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(6,7,0,1,2,3,4,5,58); SHA256_EXP(5,6,7,0,1,2,3,4,59);
233*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(4,5,6,7,0,1,2,3,60); SHA256_EXP(3,4,5,6,7,0,1,2,61);
234*8617a60dSAndroid Build Coastguard Worker 		SHA256_EXP(2,3,4,5,6,7,0,1,62); SHA256_EXP(1,2,3,4,5,6,7,0,63);
235*8617a60dSAndroid Build Coastguard Worker 
236*8617a60dSAndroid Build Coastguard Worker 		ctx->h[0] += wv[0]; ctx->h[1] += wv[1];
237*8617a60dSAndroid Build Coastguard Worker 		ctx->h[2] += wv[2]; ctx->h[3] += wv[3];
238*8617a60dSAndroid Build Coastguard Worker 		ctx->h[4] += wv[4]; ctx->h[5] += wv[5];
239*8617a60dSAndroid Build Coastguard Worker 		ctx->h[6] += wv[6]; ctx->h[7] += wv[7];
240*8617a60dSAndroid Build Coastguard Worker #endif /* !UNROLL_LOOPS */
241*8617a60dSAndroid Build Coastguard Worker 	}
242*8617a60dSAndroid Build Coastguard Worker }
243*8617a60dSAndroid Build Coastguard Worker 
vb2_sha256_update(struct vb2_sha256_context * ctx,const uint8_t * data,uint32_t size)244*8617a60dSAndroid Build Coastguard Worker void vb2_sha256_update(struct vb2_sha256_context *ctx,
245*8617a60dSAndroid Build Coastguard Worker 		       const uint8_t *data,
246*8617a60dSAndroid Build Coastguard Worker 		       uint32_t size)
247*8617a60dSAndroid Build Coastguard Worker {
248*8617a60dSAndroid Build Coastguard Worker 	unsigned int block_nb;
249*8617a60dSAndroid Build Coastguard Worker 	unsigned int new_size, rem_size, tmp_size;
250*8617a60dSAndroid Build Coastguard Worker 	const uint8_t *shifted_data;
251*8617a60dSAndroid Build Coastguard Worker 
252*8617a60dSAndroid Build Coastguard Worker 	tmp_size = VB2_SHA256_BLOCK_SIZE - ctx->size;
253*8617a60dSAndroid Build Coastguard Worker 	rem_size = size < tmp_size ? size : tmp_size;
254*8617a60dSAndroid Build Coastguard Worker 
255*8617a60dSAndroid Build Coastguard Worker 	memcpy(&ctx->block[ctx->size], data, rem_size);
256*8617a60dSAndroid Build Coastguard Worker 
257*8617a60dSAndroid Build Coastguard Worker 	if (ctx->size + size < VB2_SHA256_BLOCK_SIZE) {
258*8617a60dSAndroid Build Coastguard Worker 		ctx->size += size;
259*8617a60dSAndroid Build Coastguard Worker 		return;
260*8617a60dSAndroid Build Coastguard Worker 	}
261*8617a60dSAndroid Build Coastguard Worker 
262*8617a60dSAndroid Build Coastguard Worker 	new_size = size - rem_size;
263*8617a60dSAndroid Build Coastguard Worker 	block_nb = new_size / VB2_SHA256_BLOCK_SIZE;
264*8617a60dSAndroid Build Coastguard Worker 
265*8617a60dSAndroid Build Coastguard Worker 	shifted_data = data + rem_size;
266*8617a60dSAndroid Build Coastguard Worker 
267*8617a60dSAndroid Build Coastguard Worker 	vb2_sha256_transform(ctx, ctx->block, 1);
268*8617a60dSAndroid Build Coastguard Worker 	vb2_sha256_transform(ctx, shifted_data, block_nb);
269*8617a60dSAndroid Build Coastguard Worker 
270*8617a60dSAndroid Build Coastguard Worker 	rem_size = new_size % VB2_SHA256_BLOCK_SIZE;
271*8617a60dSAndroid Build Coastguard Worker 
272*8617a60dSAndroid Build Coastguard Worker 	memcpy(ctx->block, &shifted_data[block_nb << 6],
273*8617a60dSAndroid Build Coastguard Worker 	       rem_size);
274*8617a60dSAndroid Build Coastguard Worker 
275*8617a60dSAndroid Build Coastguard Worker 	ctx->size = rem_size;
276*8617a60dSAndroid Build Coastguard Worker 	ctx->total_size += (block_nb + 1) << 6;
277*8617a60dSAndroid Build Coastguard Worker }
278*8617a60dSAndroid Build Coastguard Worker 
vb2_sha256_finalize(struct vb2_sha256_context * ctx,uint8_t * digest,enum vb2_hash_algorithm algo)279*8617a60dSAndroid Build Coastguard Worker void vb2_sha256_finalize(struct vb2_sha256_context *ctx, uint8_t *digest,
280*8617a60dSAndroid Build Coastguard Worker 			 enum vb2_hash_algorithm algo)
281*8617a60dSAndroid Build Coastguard Worker {
282*8617a60dSAndroid Build Coastguard Worker 	unsigned int block_nb;
283*8617a60dSAndroid Build Coastguard Worker 	unsigned int pm_size;
284*8617a60dSAndroid Build Coastguard Worker 	unsigned int size_b;
285*8617a60dSAndroid Build Coastguard Worker #ifndef UNROLL_LOOPS
286*8617a60dSAndroid Build Coastguard Worker 	int i;
287*8617a60dSAndroid Build Coastguard Worker #endif
288*8617a60dSAndroid Build Coastguard Worker 
289*8617a60dSAndroid Build Coastguard Worker 	block_nb = (1 + ((VB2_SHA256_BLOCK_SIZE - 9)
290*8617a60dSAndroid Build Coastguard Worker 			 < (ctx->size % VB2_SHA256_BLOCK_SIZE)));
291*8617a60dSAndroid Build Coastguard Worker 
292*8617a60dSAndroid Build Coastguard Worker 	size_b = (ctx->total_size + ctx->size) << 3;
293*8617a60dSAndroid Build Coastguard Worker 	pm_size = block_nb << 6;
294*8617a60dSAndroid Build Coastguard Worker 
295*8617a60dSAndroid Build Coastguard Worker 	memset(ctx->block + ctx->size, 0, pm_size - ctx->size);
296*8617a60dSAndroid Build Coastguard Worker 	ctx->block[ctx->size] = 0x80;
297*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(size_b, ctx->block + pm_size - 4);
298*8617a60dSAndroid Build Coastguard Worker 
299*8617a60dSAndroid Build Coastguard Worker 	vb2_sha256_transform(ctx, ctx->block, block_nb);
300*8617a60dSAndroid Build Coastguard Worker 
301*8617a60dSAndroid Build Coastguard Worker #ifndef UNROLL_LOOPS
302*8617a60dSAndroid Build Coastguard Worker 	for (i = 0 ; i < (algo == VB2_HASH_SHA224 ? 7 : 8); i++) {
303*8617a60dSAndroid Build Coastguard Worker 		UNPACK32(ctx->h[i], &digest[i << 2]);
304*8617a60dSAndroid Build Coastguard Worker 	}
305*8617a60dSAndroid Build Coastguard Worker #else
306*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[0], &digest[ 0]);
307*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[1], &digest[ 4]);
308*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[2], &digest[ 8]);
309*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[3], &digest[12]);
310*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[4], &digest[16]);
311*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[5], &digest[20]);
312*8617a60dSAndroid Build Coastguard Worker 	UNPACK32(ctx->h[6], &digest[24]);
313*8617a60dSAndroid Build Coastguard Worker 	if (algo != VB2_HASH_SHA224) {
314*8617a60dSAndroid Build Coastguard Worker 		UNPACK32(ctx->h[7], &digest[28]);
315*8617a60dSAndroid Build Coastguard Worker 	}
316*8617a60dSAndroid Build Coastguard Worker #endif /* !UNROLL_LOOPS */
317*8617a60dSAndroid Build Coastguard Worker }
318*8617a60dSAndroid Build Coastguard Worker 
vb2_sha256_extend(const uint8_t * from,const uint8_t * by,uint8_t * to)319*8617a60dSAndroid Build Coastguard Worker void vb2_sha256_extend(const uint8_t *from, const uint8_t *by, uint8_t *to)
320*8617a60dSAndroid Build Coastguard Worker {
321*8617a60dSAndroid Build Coastguard Worker 	struct vb2_sha256_context dc;
322*8617a60dSAndroid Build Coastguard Worker 	int i;
323*8617a60dSAndroid Build Coastguard Worker 
324*8617a60dSAndroid Build Coastguard Worker 	for (i = 0; i < 8; i++) {
325*8617a60dSAndroid Build Coastguard Worker 		 PACK32(from, &dc.h[i]);
326*8617a60dSAndroid Build Coastguard Worker 		 from += 4;
327*8617a60dSAndroid Build Coastguard Worker 	}
328*8617a60dSAndroid Build Coastguard Worker 
329*8617a60dSAndroid Build Coastguard Worker 	vb2_sha256_transform(&dc, by, 1);
330*8617a60dSAndroid Build Coastguard Worker 
331*8617a60dSAndroid Build Coastguard Worker 	for (i = 0; i < 8; i++) {
332*8617a60dSAndroid Build Coastguard Worker 		 UNPACK32(dc.h[i], to);
333*8617a60dSAndroid Build Coastguard Worker 		 to += 4;
334*8617a60dSAndroid Build Coastguard Worker 	}
335*8617a60dSAndroid Build Coastguard Worker }
336