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b571afde JCPV |
1 | /* |
2 | * FIPS-180-2 compliant SHA-256 implementation | |
3 | * | |
4 | * Copyright (C) 2001-2003 Christophe Devine | |
5 | * | |
1a459660 | 6 | * SPDX-License-Identifier: GPL-2.0+ |
b571afde JCPV |
7 | */ |
8 | ||
9 | #ifndef USE_HOSTCC | |
10 | #include <common.h> | |
822ef00e AB |
11 | #include <linux/string.h> |
12 | #else | |
13 | #include <string.h> | |
b571afde JCPV |
14 | #endif /* USE_HOSTCC */ |
15 | #include <watchdog.h> | |
2b9912e6 | 16 | #include <u-boot/sha256.h> |
b571afde JCPV |
17 | |
18 | /* | |
19 | * 32-bit integer manipulation macros (big endian) | |
20 | */ | |
21 | #ifndef GET_UINT32_BE | |
22 | #define GET_UINT32_BE(n,b,i) { \ | |
23 | (n) = ( (unsigned long) (b)[(i) ] << 24 ) \ | |
24 | | ( (unsigned long) (b)[(i) + 1] << 16 ) \ | |
25 | | ( (unsigned long) (b)[(i) + 2] << 8 ) \ | |
26 | | ( (unsigned long) (b)[(i) + 3] ); \ | |
27 | } | |
28 | #endif | |
29 | #ifndef PUT_UINT32_BE | |
30 | #define PUT_UINT32_BE(n,b,i) { \ | |
31 | (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \ | |
32 | (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \ | |
33 | (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \ | |
34 | (b)[(i) + 3] = (unsigned char) ( (n) ); \ | |
35 | } | |
36 | #endif | |
37 | ||
38 | void sha256_starts(sha256_context * ctx) | |
39 | { | |
40 | ctx->total[0] = 0; | |
41 | ctx->total[1] = 0; | |
42 | ||
43 | ctx->state[0] = 0x6A09E667; | |
44 | ctx->state[1] = 0xBB67AE85; | |
45 | ctx->state[2] = 0x3C6EF372; | |
46 | ctx->state[3] = 0xA54FF53A; | |
47 | ctx->state[4] = 0x510E527F; | |
48 | ctx->state[5] = 0x9B05688C; | |
49 | ctx->state[6] = 0x1F83D9AB; | |
50 | ctx->state[7] = 0x5BE0CD19; | |
51 | } | |
52 | ||
ec7381fb | 53 | static void sha256_process(sha256_context *ctx, const uint8_t data[64]) |
b571afde JCPV |
54 | { |
55 | uint32_t temp1, temp2; | |
56 | uint32_t W[64]; | |
57 | uint32_t A, B, C, D, E, F, G, H; | |
58 | ||
59 | GET_UINT32_BE(W[0], data, 0); | |
60 | GET_UINT32_BE(W[1], data, 4); | |
61 | GET_UINT32_BE(W[2], data, 8); | |
62 | GET_UINT32_BE(W[3], data, 12); | |
63 | GET_UINT32_BE(W[4], data, 16); | |
64 | GET_UINT32_BE(W[5], data, 20); | |
65 | GET_UINT32_BE(W[6], data, 24); | |
66 | GET_UINT32_BE(W[7], data, 28); | |
67 | GET_UINT32_BE(W[8], data, 32); | |
68 | GET_UINT32_BE(W[9], data, 36); | |
69 | GET_UINT32_BE(W[10], data, 40); | |
70 | GET_UINT32_BE(W[11], data, 44); | |
71 | GET_UINT32_BE(W[12], data, 48); | |
72 | GET_UINT32_BE(W[13], data, 52); | |
73 | GET_UINT32_BE(W[14], data, 56); | |
74 | GET_UINT32_BE(W[15], data, 60); | |
75 | ||
76 | #define SHR(x,n) ((x & 0xFFFFFFFF) >> n) | |
77 | #define ROTR(x,n) (SHR(x,n) | (x << (32 - n))) | |
78 | ||
79 | #define S0(x) (ROTR(x, 7) ^ ROTR(x,18) ^ SHR(x, 3)) | |
80 | #define S1(x) (ROTR(x,17) ^ ROTR(x,19) ^ SHR(x,10)) | |
81 | ||
82 | #define S2(x) (ROTR(x, 2) ^ ROTR(x,13) ^ ROTR(x,22)) | |
83 | #define S3(x) (ROTR(x, 6) ^ ROTR(x,11) ^ ROTR(x,25)) | |
84 | ||
85 | #define F0(x,y,z) ((x & y) | (z & (x | y))) | |
86 | #define F1(x,y,z) (z ^ (x & (y ^ z))) | |
87 | ||
88 | #define R(t) \ | |
89 | ( \ | |
90 | W[t] = S1(W[t - 2]) + W[t - 7] + \ | |
91 | S0(W[t - 15]) + W[t - 16] \ | |
92 | ) | |
93 | ||
94 | #define P(a,b,c,d,e,f,g,h,x,K) { \ | |
95 | temp1 = h + S3(e) + F1(e,f,g) + K + x; \ | |
96 | temp2 = S2(a) + F0(a,b,c); \ | |
97 | d += temp1; h = temp1 + temp2; \ | |
98 | } | |
99 | ||
100 | A = ctx->state[0]; | |
101 | B = ctx->state[1]; | |
102 | C = ctx->state[2]; | |
103 | D = ctx->state[3]; | |
104 | E = ctx->state[4]; | |
105 | F = ctx->state[5]; | |
106 | G = ctx->state[6]; | |
107 | H = ctx->state[7]; | |
108 | ||
109 | P(A, B, C, D, E, F, G, H, W[0], 0x428A2F98); | |
110 | P(H, A, B, C, D, E, F, G, W[1], 0x71374491); | |
111 | P(G, H, A, B, C, D, E, F, W[2], 0xB5C0FBCF); | |
112 | P(F, G, H, A, B, C, D, E, W[3], 0xE9B5DBA5); | |
113 | P(E, F, G, H, A, B, C, D, W[4], 0x3956C25B); | |
114 | P(D, E, F, G, H, A, B, C, W[5], 0x59F111F1); | |
115 | P(C, D, E, F, G, H, A, B, W[6], 0x923F82A4); | |
116 | P(B, C, D, E, F, G, H, A, W[7], 0xAB1C5ED5); | |
117 | P(A, B, C, D, E, F, G, H, W[8], 0xD807AA98); | |
118 | P(H, A, B, C, D, E, F, G, W[9], 0x12835B01); | |
119 | P(G, H, A, B, C, D, E, F, W[10], 0x243185BE); | |
120 | P(F, G, H, A, B, C, D, E, W[11], 0x550C7DC3); | |
121 | P(E, F, G, H, A, B, C, D, W[12], 0x72BE5D74); | |
122 | P(D, E, F, G, H, A, B, C, W[13], 0x80DEB1FE); | |
123 | P(C, D, E, F, G, H, A, B, W[14], 0x9BDC06A7); | |
124 | P(B, C, D, E, F, G, H, A, W[15], 0xC19BF174); | |
125 | P(A, B, C, D, E, F, G, H, R(16), 0xE49B69C1); | |
126 | P(H, A, B, C, D, E, F, G, R(17), 0xEFBE4786); | |
127 | P(G, H, A, B, C, D, E, F, R(18), 0x0FC19DC6); | |
128 | P(F, G, H, A, B, C, D, E, R(19), 0x240CA1CC); | |
129 | P(E, F, G, H, A, B, C, D, R(20), 0x2DE92C6F); | |
130 | P(D, E, F, G, H, A, B, C, R(21), 0x4A7484AA); | |
131 | P(C, D, E, F, G, H, A, B, R(22), 0x5CB0A9DC); | |
132 | P(B, C, D, E, F, G, H, A, R(23), 0x76F988DA); | |
133 | P(A, B, C, D, E, F, G, H, R(24), 0x983E5152); | |
134 | P(H, A, B, C, D, E, F, G, R(25), 0xA831C66D); | |
135 | P(G, H, A, B, C, D, E, F, R(26), 0xB00327C8); | |
136 | P(F, G, H, A, B, C, D, E, R(27), 0xBF597FC7); | |
137 | P(E, F, G, H, A, B, C, D, R(28), 0xC6E00BF3); | |
138 | P(D, E, F, G, H, A, B, C, R(29), 0xD5A79147); | |
139 | P(C, D, E, F, G, H, A, B, R(30), 0x06CA6351); | |
140 | P(B, C, D, E, F, G, H, A, R(31), 0x14292967); | |
141 | P(A, B, C, D, E, F, G, H, R(32), 0x27B70A85); | |
142 | P(H, A, B, C, D, E, F, G, R(33), 0x2E1B2138); | |
143 | P(G, H, A, B, C, D, E, F, R(34), 0x4D2C6DFC); | |
144 | P(F, G, H, A, B, C, D, E, R(35), 0x53380D13); | |
145 | P(E, F, G, H, A, B, C, D, R(36), 0x650A7354); | |
146 | P(D, E, F, G, H, A, B, C, R(37), 0x766A0ABB); | |
147 | P(C, D, E, F, G, H, A, B, R(38), 0x81C2C92E); | |
148 | P(B, C, D, E, F, G, H, A, R(39), 0x92722C85); | |
149 | P(A, B, C, D, E, F, G, H, R(40), 0xA2BFE8A1); | |
150 | P(H, A, B, C, D, E, F, G, R(41), 0xA81A664B); | |
151 | P(G, H, A, B, C, D, E, F, R(42), 0xC24B8B70); | |
152 | P(F, G, H, A, B, C, D, E, R(43), 0xC76C51A3); | |
153 | P(E, F, G, H, A, B, C, D, R(44), 0xD192E819); | |
154 | P(D, E, F, G, H, A, B, C, R(45), 0xD6990624); | |
155 | P(C, D, E, F, G, H, A, B, R(46), 0xF40E3585); | |
156 | P(B, C, D, E, F, G, H, A, R(47), 0x106AA070); | |
157 | P(A, B, C, D, E, F, G, H, R(48), 0x19A4C116); | |
158 | P(H, A, B, C, D, E, F, G, R(49), 0x1E376C08); | |
159 | P(G, H, A, B, C, D, E, F, R(50), 0x2748774C); | |
160 | P(F, G, H, A, B, C, D, E, R(51), 0x34B0BCB5); | |
161 | P(E, F, G, H, A, B, C, D, R(52), 0x391C0CB3); | |
162 | P(D, E, F, G, H, A, B, C, R(53), 0x4ED8AA4A); | |
163 | P(C, D, E, F, G, H, A, B, R(54), 0x5B9CCA4F); | |
164 | P(B, C, D, E, F, G, H, A, R(55), 0x682E6FF3); | |
165 | P(A, B, C, D, E, F, G, H, R(56), 0x748F82EE); | |
166 | P(H, A, B, C, D, E, F, G, R(57), 0x78A5636F); | |
167 | P(G, H, A, B, C, D, E, F, R(58), 0x84C87814); | |
168 | P(F, G, H, A, B, C, D, E, R(59), 0x8CC70208); | |
169 | P(E, F, G, H, A, B, C, D, R(60), 0x90BEFFFA); | |
170 | P(D, E, F, G, H, A, B, C, R(61), 0xA4506CEB); | |
171 | P(C, D, E, F, G, H, A, B, R(62), 0xBEF9A3F7); | |
172 | P(B, C, D, E, F, G, H, A, R(63), 0xC67178F2); | |
173 | ||
174 | ctx->state[0] += A; | |
175 | ctx->state[1] += B; | |
176 | ctx->state[2] += C; | |
177 | ctx->state[3] += D; | |
178 | ctx->state[4] += E; | |
179 | ctx->state[5] += F; | |
180 | ctx->state[6] += G; | |
181 | ctx->state[7] += H; | |
182 | } | |
183 | ||
ec7381fb | 184 | void sha256_update(sha256_context *ctx, const uint8_t *input, uint32_t length) |
b571afde JCPV |
185 | { |
186 | uint32_t left, fill; | |
187 | ||
188 | if (!length) | |
189 | return; | |
190 | ||
191 | left = ctx->total[0] & 0x3F; | |
192 | fill = 64 - left; | |
193 | ||
194 | ctx->total[0] += length; | |
195 | ctx->total[0] &= 0xFFFFFFFF; | |
196 | ||
197 | if (ctx->total[0] < length) | |
198 | ctx->total[1]++; | |
199 | ||
200 | if (left && length >= fill) { | |
201 | memcpy((void *) (ctx->buffer + left), (void *) input, fill); | |
202 | sha256_process(ctx, ctx->buffer); | |
203 | length -= fill; | |
204 | input += fill; | |
205 | left = 0; | |
206 | } | |
207 | ||
208 | while (length >= 64) { | |
209 | sha256_process(ctx, input); | |
210 | length -= 64; | |
211 | input += 64; | |
212 | } | |
213 | ||
214 | if (length) | |
215 | memcpy((void *) (ctx->buffer + left), (void *) input, length); | |
216 | } | |
217 | ||
218 | static uint8_t sha256_padding[64] = { | |
219 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
220 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
221 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
222 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
223 | }; | |
224 | ||
225 | void sha256_finish(sha256_context * ctx, uint8_t digest[32]) | |
226 | { | |
227 | uint32_t last, padn; | |
228 | uint32_t high, low; | |
229 | uint8_t msglen[8]; | |
230 | ||
231 | high = ((ctx->total[0] >> 29) | |
232 | | (ctx->total[1] << 3)); | |
233 | low = (ctx->total[0] << 3); | |
234 | ||
235 | PUT_UINT32_BE(high, msglen, 0); | |
236 | PUT_UINT32_BE(low, msglen, 4); | |
237 | ||
238 | last = ctx->total[0] & 0x3F; | |
239 | padn = (last < 56) ? (56 - last) : (120 - last); | |
240 | ||
241 | sha256_update(ctx, sha256_padding, padn); | |
242 | sha256_update(ctx, msglen, 8); | |
243 | ||
244 | PUT_UINT32_BE(ctx->state[0], digest, 0); | |
245 | PUT_UINT32_BE(ctx->state[1], digest, 4); | |
246 | PUT_UINT32_BE(ctx->state[2], digest, 8); | |
247 | PUT_UINT32_BE(ctx->state[3], digest, 12); | |
248 | PUT_UINT32_BE(ctx->state[4], digest, 16); | |
249 | PUT_UINT32_BE(ctx->state[5], digest, 20); | |
250 | PUT_UINT32_BE(ctx->state[6], digest, 24); | |
251 | PUT_UINT32_BE(ctx->state[7], digest, 28); | |
252 | } | |
ec7381fb SG |
253 | |
254 | /* | |
255 | * Output = SHA-256( input buffer ). Trigger the watchdog every 'chunk_sz' | |
256 | * bytes of input processed. | |
257 | */ | |
258 | void sha256_csum_wd(const unsigned char *input, unsigned int ilen, | |
259 | unsigned char *output, unsigned int chunk_sz) | |
260 | { | |
261 | sha256_context ctx; | |
262 | #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) | |
2842c1c2 HS |
263 | const unsigned char *end; |
264 | unsigned char *curr; | |
ec7381fb SG |
265 | int chunk; |
266 | #endif | |
267 | ||
268 | sha256_starts(&ctx); | |
269 | ||
270 | #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG) | |
2842c1c2 | 271 | curr = (unsigned char *)input; |
ec7381fb SG |
272 | end = input + ilen; |
273 | while (curr < end) { | |
274 | chunk = end - curr; | |
275 | if (chunk > chunk_sz) | |
276 | chunk = chunk_sz; | |
277 | sha256_update(&ctx, curr, chunk); | |
278 | curr += chunk; | |
279 | WATCHDOG_RESET(); | |
280 | } | |
281 | #else | |
282 | sha256_update(&ctx, input, ilen); | |
283 | #endif | |
284 | ||
285 | sha256_finish(&ctx, output); | |
286 | } |