1/* public domain sha256 implementation based on fips180-3 */
2
3#include <ctype.h>
4#include <stdint.h>
5#include <stdio.h>
6#include <stdlib.h>
7#include <string.h>
8
9#include "../sha512.h"
10
11static uint64_t
12ror(uint64_t n, int k)
13{
14 return (n >> k) | (n << (64 - k));
15}
16#define Ch(x, y, z) (z ^ (x & (y ^ z)))
17#define Maj(x, y, z) ((x & y) | (z & (x | y)))
18#define S0(x) (ror(x, 28) ^ ror(x, 34) ^ ror(x, 39))
19#define S1(x) (ror(x, 14) ^ ror(x, 18) ^ ror(x, 41))
20#define R0(x) (ror(x, 1) ^ ror(x, 8) ^ (x >> 7))
21#define R1(x) (ror(x, 19) ^ ror(x, 61) ^ (x >> 6))
22
23static const uint64_t K[80] = {
24 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
25 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
26 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
27 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
28 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
29 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
30 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
31 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
32 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
33 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
34 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
35 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
36 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
37 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
38 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
39 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
40 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
41 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
42 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
43 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
44};
45
46static void
47processblock(struct sha512 *s, const uint8_t *buf)
48{
49 uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
50 int i;
51
52 for (i = 0; i < 16; i++) {
53 W[i] = (uint64_t)buf[8 * i] << 56;
54 W[i] |= (uint64_t)buf[8 * i + 1] << 48;
55 W[i] |= (uint64_t)buf[8 * i + 2] << 40;
56 W[i] |= (uint64_t)buf[8 * i + 3] << 32;
57 W[i] |= (uint64_t)buf[8 * i + 4] << 24;
58 W[i] |= (uint64_t)buf[8 * i + 5] << 16;
59 W[i] |= (uint64_t)buf[8 * i + 6] << 8;
60 W[i] |= buf[8 * i + 7];
61 }
62 for (; i < 80; i++)
63 W[i] = R1(W[i - 2]) + W[i - 7] + R0(W[i - 15]) + W[i - 16];
64 a = s->h[0];
65 b = s->h[1];
66 c = s->h[2];
67 d = s->h[3];
68 e = s->h[4];
69 f = s->h[5];
70 g = s->h[6];
71 h = s->h[7];
72 for (i = 0; i < 80; i++) {
73 t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
74 t2 = S0(a) + Maj(a, b, c);
75 h = g;
76 g = f;
77 f = e;
78 e = d + t1;
79 d = c;
80 c = b;
81 b = a;
82 a = t1 + t2;
83 }
84 s->h[0] += a;
85 s->h[1] += b;
86 s->h[2] += c;
87 s->h[3] += d;
88 s->h[4] += e;
89 s->h[5] += f;
90 s->h[6] += g;
91 s->h[7] += h;
92}
93
94static void
95pad(struct sha512 *s)
96{
97 unsigned r = s->len % 128;
98
99 s->buf[r++] = 0x80;
100 if (r > 112) {
101 memset(s->buf + r, 0, 128 - r);
102 r = 0;
103 processblock(s, s->buf);
104 }
105 memset(s->buf + r, 0, 120 - r);
106 s->len *= 8;
107 s->buf[120] = s->len >> 56;
108 s->buf[121] = s->len >> 48;
109 s->buf[122] = s->len >> 40;
110 s->buf[123] = s->len >> 32;
111 s->buf[124] = s->len >> 24;
112 s->buf[125] = s->len >> 16;
113 s->buf[126] = s->len >> 8;
114 s->buf[127] = s->len;
115 processblock(s, s->buf);
116}
117
118void
119sha512_init(void *ctx)
120{
121 struct sha512 *s = ctx;
122 s->len = 0;
123 s->h[0] = 0x6a09e667f3bcc908ULL;
124 s->h[1] = 0xbb67ae8584caa73bULL;
125 s->h[2] = 0x3c6ef372fe94f82bULL;
126 s->h[3] = 0xa54ff53a5f1d36f1ULL;
127 s->h[4] = 0x510e527fade682d1ULL;
128 s->h[5] = 0x9b05688c2b3e6c1fULL;
129 s->h[6] = 0x1f83d9abfb41bd6bULL;
130 s->h[7] = 0x5be0cd19137e2179ULL;
131}
132
133void
134sha512_sum_n(void *ctx, uint8_t *md, int n)
135{
136 struct sha512 *s = ctx;
137 int i;
138
139 pad(s);
140 for (i = 0; i < n; i++) {
141 md[8 * i] = s->h[i] >> 56;
142 md[8 * i + 1] = s->h[i] >> 48;
143 md[8 * i + 2] = s->h[i] >> 40;
144 md[8 * i + 3] = s->h[i] >> 32;
145 md[8 * i + 4] = s->h[i] >> 24;
146 md[8 * i + 5] = s->h[i] >> 16;
147 md[8 * i + 6] = s->h[i] >> 8;
148 md[8 * i + 7] = s->h[i];
149 }
150}
151
152void
153sha512_sum(void *ctx, uint8_t md[SHA512_DIGEST_LENGTH])
154{
155 sha512_sum_n(ctx, md, 8);
156}
157
158void
159sha512_update(void *ctx, const void *m, unsigned long len)
160{
161 struct sha512 *s = ctx;
162 const uint8_t *p = m;
163 unsigned r = s->len % 128;
164
165 s->len += len;
166 if (r) {
167 if (len < 128 - r) {
168 memcpy(s->buf + r, p, len);
169 return;
170 }
171 memcpy(s->buf + r, p, 128 - r);
172 len -= 128 - r;
173 p += 128 - r;
174 processblock(s, s->buf);
175 }
176 for (; len >= 128; len -= 128, p += 128)
177 processblock(s, p);
178 memcpy(s->buf, p, len);
179}
