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Linux/arch/x86/purgatory/sha256.c

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  1 /*
  2  * SHA-256, as specified in
  3  * http://csrc.nist.gov/groups/STM/cavp/documents/shs/sha256-384-512.pdf
  4  *
  5  * SHA-256 code by Jean-Luc Cooke <jlcooke@certainkey.com>.
  6  *
  7  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
  8  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  9  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
 10  * Copyright (c) 2014 Red Hat Inc.
 11  *
 12  * This program is free software; you can redistribute it and/or modify it
 13  * under the terms of the GNU General Public License as published by the Free
 14  * Software Foundation; either version 2 of the License, or (at your option)
 15  * any later version.
 16  */
 17 
 18 #include <linux/bitops.h>
 19 #include <asm/byteorder.h>
 20 #include "sha256.h"
 21 #include "../boot/string.h"
 22 
 23 static inline u32 Ch(u32 x, u32 y, u32 z)
 24 {
 25         return z ^ (x & (y ^ z));
 26 }
 27 
 28 static inline u32 Maj(u32 x, u32 y, u32 z)
 29 {
 30         return (x & y) | (z & (x | y));
 31 }
 32 
 33 #define e0(x)       (ror32(x, 2) ^ ror32(x, 13) ^ ror32(x, 22))
 34 #define e1(x)       (ror32(x, 6) ^ ror32(x, 11) ^ ror32(x, 25))
 35 #define s0(x)       (ror32(x, 7) ^ ror32(x, 18) ^ (x >> 3))
 36 #define s1(x)       (ror32(x, 17) ^ ror32(x, 19) ^ (x >> 10))
 37 
 38 static inline void LOAD_OP(int I, u32 *W, const u8 *input)
 39 {
 40         W[I] = __be32_to_cpu(((__be32 *)(input))[I]);
 41 }
 42 
 43 static inline void BLEND_OP(int I, u32 *W)
 44 {
 45         W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16];
 46 }
 47 
 48 static void sha256_transform(u32 *state, const u8 *input)
 49 {
 50         u32 a, b, c, d, e, f, g, h, t1, t2;
 51         u32 W[64];
 52         int i;
 53 
 54         /* load the input */
 55         for (i = 0; i < 16; i++)
 56                 LOAD_OP(i, W, input);
 57 
 58         /* now blend */
 59         for (i = 16; i < 64; i++)
 60                 BLEND_OP(i, W);
 61 
 62         /* load the state into our registers */
 63         a = state[0];  b = state[1];  c = state[2];  d = state[3];
 64         e = state[4];  f = state[5];  g = state[6];  h = state[7];
 65 
 66         /* now iterate */
 67         t1 = h + e1(e) + Ch(e, f, g) + 0x428a2f98 + W[0];
 68         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1 + t2;
 69         t1 = g + e1(d) + Ch(d, e, f) + 0x71374491 + W[1];
 70         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1 + t2;
 71         t1 = f + e1(c) + Ch(c, d, e) + 0xb5c0fbcf + W[2];
 72         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1 + t2;
 73         t1 = e + e1(b) + Ch(b, c, d) + 0xe9b5dba5 + W[3];
 74         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1 + t2;
 75         t1 = d + e1(a) + Ch(a, b, c) + 0x3956c25b + W[4];
 76         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1 + t2;
 77         t1 = c + e1(h) + Ch(h, a, b) + 0x59f111f1 + W[5];
 78         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1 + t2;
 79         t1 = b + e1(g) + Ch(g, h, a) + 0x923f82a4 + W[6];
 80         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1 + t2;
 81         t1 = a + e1(f) + Ch(f, g, h) + 0xab1c5ed5 + W[7];
 82         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1 + t2;
 83 
 84         t1 = h + e1(e) + Ch(e, f, g) + 0xd807aa98 + W[8];
 85         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1 + t2;
 86         t1 = g + e1(d) + Ch(d, e, f) + 0x12835b01 + W[9];
 87         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1 + t2;
 88         t1 = f + e1(c) + Ch(c, d, e) + 0x243185be + W[10];
 89         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1 + t2;
 90         t1 = e + e1(b) + Ch(b, c, d) + 0x550c7dc3 + W[11];
 91         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1 + t2;
 92         t1 = d + e1(a) + Ch(a, b, c) + 0x72be5d74 + W[12];
 93         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1 + t2;
 94         t1 = c + e1(h) + Ch(h, a, b) + 0x80deb1fe + W[13];
 95         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1 + t2;
 96         t1 = b + e1(g) + Ch(g, h, a) + 0x9bdc06a7 + W[14];
 97         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1 + t2;
 98         t1 = a + e1(f) + Ch(f, g, h) + 0xc19bf174 + W[15];
 99         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
100 
101         t1 = h + e1(e) + Ch(e, f, g) + 0xe49b69c1 + W[16];
102         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
103         t1 = g + e1(d) + Ch(d, e, f) + 0xefbe4786 + W[17];
104         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
105         t1 = f + e1(c) + Ch(c, d, e) + 0x0fc19dc6 + W[18];
106         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
107         t1 = e + e1(b) + Ch(b, c, d) + 0x240ca1cc + W[19];
108         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
109         t1 = d + e1(a) + Ch(a, b, c) + 0x2de92c6f + W[20];
110         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
111         t1 = c + e1(h) + Ch(h, a, b) + 0x4a7484aa + W[21];
112         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
113         t1 = b + e1(g) + Ch(g, h, a) + 0x5cb0a9dc + W[22];
114         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
115         t1 = a + e1(f) + Ch(f, g, h) + 0x76f988da + W[23];
116         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
117 
118         t1 = h + e1(e) + Ch(e, f, g) + 0x983e5152 + W[24];
119         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
120         t1 = g + e1(d) + Ch(d, e, f) + 0xa831c66d + W[25];
121         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
122         t1 = f + e1(c) + Ch(c, d, e) + 0xb00327c8 + W[26];
123         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
124         t1 = e + e1(b) + Ch(b, c, d) + 0xbf597fc7 + W[27];
125         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
126         t1 = d + e1(a) + Ch(a, b, c) + 0xc6e00bf3 + W[28];
127         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
128         t1 = c + e1(h) + Ch(h, a, b) + 0xd5a79147 + W[29];
129         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
130         t1 = b + e1(g) + Ch(g, h, a) + 0x06ca6351 + W[30];
131         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
132         t1 = a + e1(f) + Ch(f, g, h) + 0x14292967 + W[31];
133         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
134 
135         t1 = h + e1(e) + Ch(e, f, g) + 0x27b70a85 + W[32];
136         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
137         t1 = g + e1(d) + Ch(d, e, f) + 0x2e1b2138 + W[33];
138         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
139         t1 = f + e1(c) + Ch(c, d, e) + 0x4d2c6dfc + W[34];
140         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
141         t1 = e + e1(b) + Ch(b, c, d) + 0x53380d13 + W[35];
142         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
143         t1 = d + e1(a) + Ch(a, b, c) + 0x650a7354 + W[36];
144         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
145         t1 = c + e1(h) + Ch(h, a, b) + 0x766a0abb + W[37];
146         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
147         t1 = b + e1(g) + Ch(g, h, a) + 0x81c2c92e + W[38];
148         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
149         t1 = a + e1(f) + Ch(f, g, h) + 0x92722c85 + W[39];
150         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
151 
152         t1 = h + e1(e) + Ch(e, f, g) + 0xa2bfe8a1 + W[40];
153         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
154         t1 = g + e1(d) + Ch(d, e, f) + 0xa81a664b + W[41];
155         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
156         t1 = f + e1(c) + Ch(c, d, e) + 0xc24b8b70 + W[42];
157         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
158         t1 = e + e1(b) + Ch(b, c, d) + 0xc76c51a3 + W[43];
159         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
160         t1 = d + e1(a) + Ch(a, b, c) + 0xd192e819 + W[44];
161         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
162         t1 = c + e1(h) + Ch(h, a, b) + 0xd6990624 + W[45];
163         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
164         t1 = b + e1(g) + Ch(g, h, a) + 0xf40e3585 + W[46];
165         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
166         t1 = a + e1(f) + Ch(f, g, h) + 0x106aa070 + W[47];
167         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
168 
169         t1 = h + e1(e) + Ch(e, f, g) + 0x19a4c116 + W[48];
170         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
171         t1 = g + e1(d) + Ch(d, e, f) + 0x1e376c08 + W[49];
172         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
173         t1 = f + e1(c) + Ch(c, d, e) + 0x2748774c + W[50];
174         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
175         t1 = e + e1(b) + Ch(b, c, d) + 0x34b0bcb5 + W[51];
176         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
177         t1 = d + e1(a) + Ch(a, b, c) + 0x391c0cb3 + W[52];
178         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
179         t1 = c + e1(h) + Ch(h, a, b) + 0x4ed8aa4a + W[53];
180         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
181         t1 = b + e1(g) + Ch(g, h, a) + 0x5b9cca4f + W[54];
182         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
183         t1 = a + e1(f) + Ch(f, g, h) + 0x682e6ff3 + W[55];
184         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
185 
186         t1 = h + e1(e) + Ch(e, f, g) + 0x748f82ee + W[56];
187         t2 = e0(a) + Maj(a, b, c);    d += t1;    h = t1+t2;
188         t1 = g + e1(d) + Ch(d, e, f) + 0x78a5636f + W[57];
189         t2 = e0(h) + Maj(h, a, b);    c += t1;    g = t1+t2;
190         t1 = f + e1(c) + Ch(c, d, e) + 0x84c87814 + W[58];
191         t2 = e0(g) + Maj(g, h, a);    b += t1;    f = t1+t2;
192         t1 = e + e1(b) + Ch(b, c, d) + 0x8cc70208 + W[59];
193         t2 = e0(f) + Maj(f, g, h);    a += t1;    e = t1+t2;
194         t1 = d + e1(a) + Ch(a, b, c) + 0x90befffa + W[60];
195         t2 = e0(e) + Maj(e, f, g);    h += t1;    d = t1+t2;
196         t1 = c + e1(h) + Ch(h, a, b) + 0xa4506ceb + W[61];
197         t2 = e0(d) + Maj(d, e, f);    g += t1;    c = t1+t2;
198         t1 = b + e1(g) + Ch(g, h, a) + 0xbef9a3f7 + W[62];
199         t2 = e0(c) + Maj(c, d, e);    f += t1;    b = t1+t2;
200         t1 = a + e1(f) + Ch(f, g, h) + 0xc67178f2 + W[63];
201         t2 = e0(b) + Maj(b, c, d);    e += t1;    a = t1+t2;
202 
203         state[0] += a; state[1] += b; state[2] += c; state[3] += d;
204         state[4] += e; state[5] += f; state[6] += g; state[7] += h;
205 
206         /* clear any sensitive info... */
207         a = b = c = d = e = f = g = h = t1 = t2 = 0;
208         memset(W, 0, 64 * sizeof(u32));
209 }
210 
211 int sha256_init(struct sha256_state *sctx)
212 {
213         sctx->state[0] = SHA256_H0;
214         sctx->state[1] = SHA256_H1;
215         sctx->state[2] = SHA256_H2;
216         sctx->state[3] = SHA256_H3;
217         sctx->state[4] = SHA256_H4;
218         sctx->state[5] = SHA256_H5;
219         sctx->state[6] = SHA256_H6;
220         sctx->state[7] = SHA256_H7;
221         sctx->count = 0;
222 
223         return 0;
224 }
225 
226 int sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len)
227 {
228         unsigned int partial, done;
229         const u8 *src;
230 
231         partial = sctx->count & 0x3f;
232         sctx->count += len;
233         done = 0;
234         src = data;
235 
236         if ((partial + len) > 63) {
237                 if (partial) {
238                         done = -partial;
239                         memcpy(sctx->buf + partial, data, done + 64);
240                         src = sctx->buf;
241                 }
242 
243                 do {
244                         sha256_transform(sctx->state, src);
245                         done += 64;
246                         src = data + done;
247                 } while (done + 63 < len);
248 
249                 partial = 0;
250         }
251         memcpy(sctx->buf + partial, src, len - done);
252 
253         return 0;
254 }
255 
256 int sha256_final(struct sha256_state *sctx, u8 *out)
257 {
258         __be32 *dst = (__be32 *)out;
259         __be64 bits;
260         unsigned int index, pad_len;
261         int i;
262         static const u8 padding[64] = { 0x80, };
263 
264         /* Save number of bits */
265         bits = cpu_to_be64(sctx->count << 3);
266 
267         /* Pad out to 56 mod 64. */
268         index = sctx->count & 0x3f;
269         pad_len = (index < 56) ? (56 - index) : ((64+56) - index);
270         sha256_update(sctx, padding, pad_len);
271 
272         /* Append length (before padding) */
273         sha256_update(sctx, (const u8 *)&bits, sizeof(bits));
274 
275         /* Store state in digest */
276         for (i = 0; i < 8; i++)
277                 dst[i] = cpu_to_be32(sctx->state[i]);
278 
279         /* Zeroize sensitive information. */
280         memset(sctx, 0, sizeof(*sctx));
281 
282         return 0;
283 }
284 

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