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cd14cc10 JA |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * SHA-256, as specified in | |
5 | * http://csrc.nist.gov/cryptval/shs/sha256-384-512.pdf | |
6 | * | |
7 | * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>. | |
8 | * | |
9 | * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com> | |
10 | * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk> | |
11 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License as published by the Free | |
15 | * Software Foundation; either version 2 of the License, or (at your option) | |
16 | * any later version. | |
17 | * | |
18 | */ | |
19 | #include <string.h> | |
20 | #include <inttypes.h> | |
cd14cc10 | 21 | |
00fb3c8d | 22 | #include "../lib/bswap.h" |
cd14cc10 JA |
23 | #include "sha256.h" |
24 | ||
cd14cc10 JA |
25 | #define SHA256_DIGEST_SIZE 32 |
26 | #define SHA256_HMAC_BLOCK_SIZE 64 | |
27 | ||
28 | static inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z) | |
29 | { | |
30 | return z ^ (x & (y ^ z)); | |
31 | } | |
32 | ||
33 | static inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z) | |
34 | { | |
35 | return (x & y) | (z & (x | y)); | |
36 | } | |
37 | ||
38 | #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22)) | |
39 | #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25)) | |
40 | #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3)) | |
41 | #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10)) | |
42 | ||
43 | #define H0 0x6a09e667 | |
44 | #define H1 0xbb67ae85 | |
45 | #define H2 0x3c6ef372 | |
46 | #define H3 0xa54ff53a | |
47 | #define H4 0x510e527f | |
48 | #define H5 0x9b05688c | |
49 | #define H6 0x1f83d9ab | |
50 | #define H7 0x5be0cd19 | |
51 | ||
52 | static inline uint32_t ror32(uint32_t word, unsigned int shift) | |
53 | { | |
54 | return (word >> shift) | (word << (32 - shift)); | |
55 | } | |
56 | ||
57 | static inline void LOAD_OP(int I, uint32_t *W, const uint8_t *input) | |
58 | { | |
59 | W[I] = __be32_to_cpu(((uint32_t *)(input))[I]); | |
60 | } | |
61 | ||
62 | static inline void BLEND_OP(int I, uint32_t *W) | |
63 | { | |
64 | W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; | |
65 | } | |
66 | ||
67 | static void sha256_transform(uint32_t *state, const uint8_t *input) | |
68 | { | |
69 | uint32_t a, b, c, d, e, f, g, h, t1, t2; | |
70 | uint32_t W[64]; | |
71 | int i; | |
72 | ||
73 | /* load the input */ | |
74 | for (i = 0; i < 16; i++) | |
75 | LOAD_OP(i, W, input); | |
76 | ||
77 | /* now blend */ | |
78 | for (i = 16; i < 64; i++) | |
79 | BLEND_OP(i, W); | |
80 | ||
81 | /* load the state into our registers */ | |
82 | a=state[0]; b=state[1]; c=state[2]; d=state[3]; | |
83 | e=state[4]; f=state[5]; g=state[6]; h=state[7]; | |
84 | ||
85 | /* now iterate */ | |
86 | t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0]; | |
87 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
88 | t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1]; | |
89 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
90 | t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2]; | |
91 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
92 | t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3]; | |
93 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
94 | t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4]; | |
95 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
96 | t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5]; | |
97 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
98 | t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6]; | |
99 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
100 | t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7]; | |
101 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
102 | ||
103 | t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8]; | |
104 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
105 | t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9]; | |
106 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
107 | t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10]; | |
108 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
109 | t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11]; | |
110 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
111 | t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12]; | |
112 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
113 | t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13]; | |
114 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
115 | t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14]; | |
116 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
117 | t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15]; | |
118 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
119 | ||
120 | t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16]; | |
121 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
122 | t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17]; | |
123 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
124 | t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18]; | |
125 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
126 | t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19]; | |
127 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
128 | t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20]; | |
129 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
130 | t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21]; | |
131 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
132 | t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22]; | |
133 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
134 | t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23]; | |
135 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
136 | ||
137 | t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24]; | |
138 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
139 | t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25]; | |
140 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
141 | t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26]; | |
142 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
143 | t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27]; | |
144 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
145 | t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28]; | |
146 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
147 | t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29]; | |
148 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
149 | t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30]; | |
150 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
151 | t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31]; | |
152 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
153 | ||
154 | t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32]; | |
155 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
156 | t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33]; | |
157 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
158 | t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34]; | |
159 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
160 | t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35]; | |
161 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
162 | t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36]; | |
163 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
164 | t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37]; | |
165 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
166 | t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38]; | |
167 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
168 | t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39]; | |
169 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
170 | ||
171 | t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40]; | |
172 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
173 | t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41]; | |
174 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
175 | t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42]; | |
176 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
177 | t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43]; | |
178 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
179 | t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44]; | |
180 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
181 | t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45]; | |
182 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
183 | t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46]; | |
184 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
185 | t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47]; | |
186 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
187 | ||
188 | t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48]; | |
189 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
190 | t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49]; | |
191 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
192 | t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50]; | |
193 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
194 | t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51]; | |
195 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
196 | t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52]; | |
197 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
198 | t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53]; | |
199 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
200 | t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54]; | |
201 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
202 | t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55]; | |
203 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
204 | ||
205 | t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56]; | |
206 | t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2; | |
207 | t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57]; | |
208 | t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2; | |
209 | t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58]; | |
210 | t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2; | |
211 | t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59]; | |
212 | t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2; | |
213 | t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60]; | |
214 | t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2; | |
215 | t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61]; | |
216 | t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2; | |
217 | t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62]; | |
218 | t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2; | |
219 | t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63]; | |
220 | t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2; | |
221 | ||
222 | state[0] += a; state[1] += b; state[2] += c; state[3] += d; | |
223 | state[4] += e; state[5] += f; state[6] += g; state[7] += h; | |
224 | ||
225 | /* clear any sensitive info... */ | |
226 | a = b = c = d = e = f = g = h = t1 = t2 = 0; | |
227 | memset(W, 0, 64 * sizeof(uint32_t)); | |
228 | } | |
229 | ||
230 | void sha256_init(struct sha256_ctx *sctx) | |
231 | { | |
232 | sctx->state[0] = H0; | |
233 | sctx->state[1] = H1; | |
234 | sctx->state[2] = H2; | |
235 | sctx->state[3] = H3; | |
236 | sctx->state[4] = H4; | |
237 | sctx->state[5] = H5; | |
238 | sctx->state[6] = H6; | |
239 | sctx->state[7] = H7; | |
240 | sctx->count[0] = sctx->count[1] = 0; | |
241 | } | |
242 | ||
243 | void sha256_update(struct sha256_ctx *sctx, const uint8_t *data, | |
244 | unsigned int len) | |
245 | { | |
246 | unsigned int i, index, part_len; | |
247 | ||
248 | /* Compute number of bytes mod 128 */ | |
249 | index = (unsigned int)((sctx->count[0] >> 3) & 0x3f); | |
250 | ||
251 | /* Update number of bits */ | |
252 | if ((sctx->count[0] += (len << 3)) < (len << 3)) { | |
253 | sctx->count[1]++; | |
254 | sctx->count[1] += (len >> 29); | |
255 | } | |
256 | ||
257 | part_len = 64 - index; | |
258 | ||
259 | /* Transform as many times as possible. */ | |
260 | if (len >= part_len) { | |
261 | memcpy(&sctx->buf[index], data, part_len); | |
262 | sha256_transform(sctx->state, sctx->buf); | |
263 | ||
264 | for (i = part_len; i + 63 < len; i += 64) | |
265 | sha256_transform(sctx->state, &data[i]); | |
266 | index = 0; | |
267 | } else { | |
268 | i = 0; | |
269 | } | |
270 | ||
271 | /* Buffer remaining input */ | |
272 | memcpy(&sctx->buf[index], &data[i], len-i); | |
273 | } |