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
21 #include "../lib/bswap.h"
22 #include "sha256.h"
23
24 #define SHA256_DIGEST_SIZE 32
25 #define SHA256_HMAC_BLOCK_SIZE 64
26
Ch(uint32_t x,uint32_t y,uint32_t z)27 static inline uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
28 {
29 return z ^ (x & (y ^ z));
30 }
31
Maj(uint32_t x,uint32_t y,uint32_t z)32 static inline uint32_t Maj(uint32_t x, uint32_t y, uint32_t z)
33 {
34 return (x & y) | (z & (x | y));
35 }
36
37 #define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
38 #define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
39 #define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
40 #define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
41
42 #define H0 0x6a09e667
43 #define H1 0xbb67ae85
44 #define H2 0x3c6ef372
45 #define H3 0xa54ff53a
46 #define H4 0x510e527f
47 #define H5 0x9b05688c
48 #define H6 0x1f83d9ab
49 #define H7 0x5be0cd19
50
ror32(uint32_t word,unsigned int shift)51 static inline uint32_t ror32(uint32_t word, unsigned int shift)
52 {
53 return (word >> shift) | (word << (32 - shift));
54 }
55
LOAD_OP(int I,uint32_t * W,const uint8_t * input)56 static inline void LOAD_OP(int I, uint32_t *W, const uint8_t *input)
57 {
58 W[I] = __be32_to_cpu(((uint32_t *)(input))[I]);
59 }
60
BLEND_OP(int I,uint32_t * W)61 static inline void BLEND_OP(int I, uint32_t *W)
62 {
63 W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
64 }
65
sha256_transform(uint32_t * state,const uint8_t * input)66 static void sha256_transform(uint32_t *state, const uint8_t *input)
67 {
68 uint32_t a, b, c, d, e, f, g, h, t1, t2;
69 uint32_t W[64];
70 int i;
71
72 /* load the input */
73 for (i = 0; i < 16; i++)
74 LOAD_OP(i, W, input);
75
76 /* now blend */
77 for (i = 16; i < 64; i++)
78 BLEND_OP(i, W);
79
80 /* load the state into our registers */
81 a=state[0]; b=state[1]; c=state[2]; d=state[3];
82 e=state[4]; f=state[5]; g=state[6]; h=state[7];
83
84 /* now iterate */
85 t1 = h + e1(e) + Ch(e,f,g) + 0x428a2f98 + W[ 0];
86 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
87 t1 = g + e1(d) + Ch(d,e,f) + 0x71374491 + W[ 1];
88 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
89 t1 = f + e1(c) + Ch(c,d,e) + 0xb5c0fbcf + W[ 2];
90 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
91 t1 = e + e1(b) + Ch(b,c,d) + 0xe9b5dba5 + W[ 3];
92 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
93 t1 = d + e1(a) + Ch(a,b,c) + 0x3956c25b + W[ 4];
94 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
95 t1 = c + e1(h) + Ch(h,a,b) + 0x59f111f1 + W[ 5];
96 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
97 t1 = b + e1(g) + Ch(g,h,a) + 0x923f82a4 + W[ 6];
98 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
99 t1 = a + e1(f) + Ch(f,g,h) + 0xab1c5ed5 + W[ 7];
100 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
101
102 t1 = h + e1(e) + Ch(e,f,g) + 0xd807aa98 + W[ 8];
103 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
104 t1 = g + e1(d) + Ch(d,e,f) + 0x12835b01 + W[ 9];
105 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
106 t1 = f + e1(c) + Ch(c,d,e) + 0x243185be + W[10];
107 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
108 t1 = e + e1(b) + Ch(b,c,d) + 0x550c7dc3 + W[11];
109 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
110 t1 = d + e1(a) + Ch(a,b,c) + 0x72be5d74 + W[12];
111 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
112 t1 = c + e1(h) + Ch(h,a,b) + 0x80deb1fe + W[13];
113 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
114 t1 = b + e1(g) + Ch(g,h,a) + 0x9bdc06a7 + W[14];
115 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
116 t1 = a + e1(f) + Ch(f,g,h) + 0xc19bf174 + W[15];
117 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
118
119 t1 = h + e1(e) + Ch(e,f,g) + 0xe49b69c1 + W[16];
120 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
121 t1 = g + e1(d) + Ch(d,e,f) + 0xefbe4786 + W[17];
122 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
123 t1 = f + e1(c) + Ch(c,d,e) + 0x0fc19dc6 + W[18];
124 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
125 t1 = e + e1(b) + Ch(b,c,d) + 0x240ca1cc + W[19];
126 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
127 t1 = d + e1(a) + Ch(a,b,c) + 0x2de92c6f + W[20];
128 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
129 t1 = c + e1(h) + Ch(h,a,b) + 0x4a7484aa + W[21];
130 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
131 t1 = b + e1(g) + Ch(g,h,a) + 0x5cb0a9dc + W[22];
132 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
133 t1 = a + e1(f) + Ch(f,g,h) + 0x76f988da + W[23];
134 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
135
136 t1 = h + e1(e) + Ch(e,f,g) + 0x983e5152 + W[24];
137 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
138 t1 = g + e1(d) + Ch(d,e,f) + 0xa831c66d + W[25];
139 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
140 t1 = f + e1(c) + Ch(c,d,e) + 0xb00327c8 + W[26];
141 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
142 t1 = e + e1(b) + Ch(b,c,d) + 0xbf597fc7 + W[27];
143 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
144 t1 = d + e1(a) + Ch(a,b,c) + 0xc6e00bf3 + W[28];
145 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
146 t1 = c + e1(h) + Ch(h,a,b) + 0xd5a79147 + W[29];
147 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
148 t1 = b + e1(g) + Ch(g,h,a) + 0x06ca6351 + W[30];
149 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
150 t1 = a + e1(f) + Ch(f,g,h) + 0x14292967 + W[31];
151 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
152
153 t1 = h + e1(e) + Ch(e,f,g) + 0x27b70a85 + W[32];
154 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
155 t1 = g + e1(d) + Ch(d,e,f) + 0x2e1b2138 + W[33];
156 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
157 t1 = f + e1(c) + Ch(c,d,e) + 0x4d2c6dfc + W[34];
158 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
159 t1 = e + e1(b) + Ch(b,c,d) + 0x53380d13 + W[35];
160 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
161 t1 = d + e1(a) + Ch(a,b,c) + 0x650a7354 + W[36];
162 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
163 t1 = c + e1(h) + Ch(h,a,b) + 0x766a0abb + W[37];
164 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
165 t1 = b + e1(g) + Ch(g,h,a) + 0x81c2c92e + W[38];
166 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
167 t1 = a + e1(f) + Ch(f,g,h) + 0x92722c85 + W[39];
168 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
169
170 t1 = h + e1(e) + Ch(e,f,g) + 0xa2bfe8a1 + W[40];
171 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
172 t1 = g + e1(d) + Ch(d,e,f) + 0xa81a664b + W[41];
173 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
174 t1 = f + e1(c) + Ch(c,d,e) + 0xc24b8b70 + W[42];
175 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
176 t1 = e + e1(b) + Ch(b,c,d) + 0xc76c51a3 + W[43];
177 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
178 t1 = d + e1(a) + Ch(a,b,c) + 0xd192e819 + W[44];
179 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
180 t1 = c + e1(h) + Ch(h,a,b) + 0xd6990624 + W[45];
181 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
182 t1 = b + e1(g) + Ch(g,h,a) + 0xf40e3585 + W[46];
183 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
184 t1 = a + e1(f) + Ch(f,g,h) + 0x106aa070 + W[47];
185 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
186
187 t1 = h + e1(e) + Ch(e,f,g) + 0x19a4c116 + W[48];
188 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
189 t1 = g + e1(d) + Ch(d,e,f) + 0x1e376c08 + W[49];
190 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
191 t1 = f + e1(c) + Ch(c,d,e) + 0x2748774c + W[50];
192 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
193 t1 = e + e1(b) + Ch(b,c,d) + 0x34b0bcb5 + W[51];
194 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
195 t1 = d + e1(a) + Ch(a,b,c) + 0x391c0cb3 + W[52];
196 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
197 t1 = c + e1(h) + Ch(h,a,b) + 0x4ed8aa4a + W[53];
198 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
199 t1 = b + e1(g) + Ch(g,h,a) + 0x5b9cca4f + W[54];
200 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
201 t1 = a + e1(f) + Ch(f,g,h) + 0x682e6ff3 + W[55];
202 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
203
204 t1 = h + e1(e) + Ch(e,f,g) + 0x748f82ee + W[56];
205 t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
206 t1 = g + e1(d) + Ch(d,e,f) + 0x78a5636f + W[57];
207 t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
208 t1 = f + e1(c) + Ch(c,d,e) + 0x84c87814 + W[58];
209 t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
210 t1 = e + e1(b) + Ch(b,c,d) + 0x8cc70208 + W[59];
211 t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
212 t1 = d + e1(a) + Ch(a,b,c) + 0x90befffa + W[60];
213 t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
214 t1 = c + e1(h) + Ch(h,a,b) + 0xa4506ceb + W[61];
215 t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
216 t1 = b + e1(g) + Ch(g,h,a) + 0xbef9a3f7 + W[62];
217 t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
218 t1 = a + e1(f) + Ch(f,g,h) + 0xc67178f2 + W[63];
219 t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
220
221 state[0] += a; state[1] += b; state[2] += c; state[3] += d;
222 state[4] += e; state[5] += f; state[6] += g; state[7] += h;
223
224 /* clear any sensitive info... */
225 a = b = c = d = e = f = g = h = t1 = t2 = 0;
226 memset(W, 0, 64 * sizeof(uint32_t));
227 }
228
fio_sha256_init(struct fio_sha256_ctx * sctx)229 void fio_sha256_init(struct fio_sha256_ctx *sctx)
230 {
231 sctx->state[0] = H0;
232 sctx->state[1] = H1;
233 sctx->state[2] = H2;
234 sctx->state[3] = H3;
235 sctx->state[4] = H4;
236 sctx->state[5] = H5;
237 sctx->state[6] = H6;
238 sctx->state[7] = H7;
239 sctx->count = 0;
240 }
241
fio_sha256_update(struct fio_sha256_ctx * sctx,const uint8_t * data,unsigned int len)242 void fio_sha256_update(struct fio_sha256_ctx *sctx, const uint8_t *data,
243 unsigned int len)
244 {
245 unsigned int partial, done;
246 const uint8_t *src;
247
248 partial = sctx->count & 0x3f;
249 sctx->count += len;
250 done = 0;
251 src = data;
252
253 if ((partial + len) > 63) {
254 if (partial) {
255 done = -partial;
256 memcpy(sctx->buf + partial, data, done + 64);
257 src = sctx->buf;
258 }
259
260 do {
261 sha256_transform(sctx->state, src);
262 done += 64;
263 src = data + done;
264 } while (done + 63 < len);
265
266 partial = 0;
267 }
268 memcpy(sctx->buf + partial, src, len - done);
269 }
270
fio_sha256_final(struct fio_sha256_ctx * sctx)271 void fio_sha256_final(struct fio_sha256_ctx *sctx)
272 {
273 uint64_t bits;
274 unsigned int index, pad_len;
275 int i;
276 static const uint8_t padding[64] = { 0x80, };
277
278 /* Save number of bits */
279 bits = (uint64_t) sctx->count << 3;
280
281 /* Pad out to 56 mod 64. */
282 index = sctx->count & 0x3f;
283 pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
284 fio_sha256_update(sctx, padding, pad_len);
285
286 /* Append length (before padding) */
287 fio_sha256_update(sctx, (const uint8_t *)&bits, sizeof(bits));
288
289 /* Store state in digest */
290 for (i = 0; i < 8; i++)
291 sctx->buf[i] = sctx->state[i];
292 }
293