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>
21
22 #include "../lib/bswap.h"
23 #include "sha256.h"
24
25 #define SHA256_DIGEST_SIZE 32
26 #define SHA256_HMAC_BLOCK_SIZE 64
27
Ch(uint32_t x,uint32_t y,uint32_t z)28 static inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
29 {
30 return z ^ (x & (y ^ z));
31 }
32
Maj(uint32_t x,uint32_t y,uint32_t z)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
ror32(uint32_t word,unsigned int shift)52 static inline uint32_t ror32(uint32_t word, unsigned int shift)
53 {
54 return (word >> shift) | (word << (32 - shift));
55 }
56
LOAD_OP(int I,uint32_t * W,const uint8_t * input)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
BLEND_OP(int I,uint32_t * W)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
sha256_transform(uint32_t * state,const uint8_t * input)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
fio_sha256_init(struct fio_sha256_ctx * sctx)230 void fio_sha256_init(struct fio_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;
241 }
242
fio_sha256_update(struct fio_sha256_ctx * sctx,const uint8_t * data,unsigned int len)243 void fio_sha256_update(struct fio_sha256_ctx *sctx, const uint8_t *data,
244 unsigned int len)
245 {
246 unsigned int partial, done;
247 const uint8_t *src;
248
249 partial = sctx->count & 0x3f;
250 sctx->count += len;
251 done = 0;
252 src = data;
253
254 if ((partial + len) > 63) {
255 if (partial) {
256 done = -partial;
257 memcpy(sctx->buf + partial, data, done + 64);
258 src = sctx->buf;
259 }
260
261 do {
262 sha256_transform(sctx->state, src);
263 done += 64;
264 src = data + done;
265 } while (done + 63 < len);
266
267 partial = 0;
268 }
269 memcpy(sctx->buf + partial, src, len - done);
270 }
271
fio_sha256_final(struct fio_sha256_ctx * sctx)272 void fio_sha256_final(struct fio_sha256_ctx *sctx)
273 {
274 uint64_t bits;
275 unsigned int index, pad_len;
276 int i;
277 static const uint8_t padding[64] = { 0x80, };
278
279 /* Save number of bits */
280 bits = (uint64_t) sctx->count << 3;
281
282 /* Pad out to 56 mod 64. */
283 index = sctx->count & 0x3f;
284 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
285 fio_sha256_update(sctx, padding, pad_len);
286
287 /* Append length (before padding) */
288 fio_sha256_update(sctx, (const uint8_t *)&bits, sizeof(bits));
289
290 /* Store state in digest */
291 for (i = 0; i < 8; i++)
292 sctx->buf[i] = sctx->state[i];
293 }
294