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 ror(uint64_t n, int k) { return (n >> k) | (n << (64-k)); }
12#define Ch(x,y,z) (z ^ (x & (y ^ z)))
13#define Maj(x,y,z) ((x & y) | (z & (x | y)))
14#define S0(x) (ror(x,28) ^ ror(x,34) ^ ror(x,39))
15#define S1(x) (ror(x,14) ^ ror(x,18) ^ ror(x,41))
16#define R0(x) (ror(x,1) ^ ror(x,8) ^ (x>>7))
17#define R1(x) (ror(x,19) ^ ror(x,61) ^ (x>>6))
18
19static const uint64_t K[80] = {
200x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
210x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
220xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
230x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
240xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
250x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
260x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
270xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
280x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
290x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
300xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
310xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
320x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
330x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
340x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
350x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
360xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
370x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
380x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
390x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
40};
41
42static void
43processblock(struct sha512 *s, const uint8_t *buf)
44{
45 uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
46 int i;
47
48 for (i = 0; i < 16; i++) {
49 W[i] = (uint64_t)buf[8*i]<<56;
50 W[i] |= (uint64_t)buf[8*i+1]<<48;
51 W[i] |= (uint64_t)buf[8*i+2]<<40;
52 W[i] |= (uint64_t)buf[8*i+3]<<32;
53 W[i] |= (uint64_t)buf[8*i+4]<<24;
54 W[i] |= (uint64_t)buf[8*i+5]<<16;
55 W[i] |= (uint64_t)buf[8*i+6]<<8;
56 W[i] |= buf[8*i+7];
57 }
58 for (; i < 80; i++)
59 W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
60 a = s->h[0];
61 b = s->h[1];
62 c = s->h[2];
63 d = s->h[3];
64 e = s->h[4];
65 f = s->h[5];
66 g = s->h[6];
67 h = s->h[7];
68 for (i = 0; i < 80; i++) {
69 t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
70 t2 = S0(a) + Maj(a,b,c);
71 h = g;
72 g = f;
73 f = e;
74 e = d + t1;
75 d = c;
76 c = b;
77 b = a;
78 a = t1 + t2;
79 }
80 s->h[0] += a;
81 s->h[1] += b;
82 s->h[2] += c;
83 s->h[3] += d;
84 s->h[4] += e;
85 s->h[5] += f;
86 s->h[6] += g;
87 s->h[7] += h;
88}
89
90static void
91pad(struct sha512 *s)
92{
93 unsigned r = s->len % 128;
94
95 s->buf[r++] = 0x80;
96 if (r > 112) {
97 memset(s->buf + r, 0, 128 - r);
98 r = 0;
99 processblock(s, s->buf);
100 }
101 memset(s->buf + r, 0, 120 - r);
102 s->len *= 8;
103 s->buf[120] = s->len >> 56;
104 s->buf[121] = s->len >> 48;
105 s->buf[122] = s->len >> 40;
106 s->buf[123] = s->len >> 32;
107 s->buf[124] = s->len >> 24;
108 s->buf[125] = s->len >> 16;
109 s->buf[126] = s->len >> 8;
110 s->buf[127] = s->len;
111 processblock(s, s->buf);
112}
113
114void
115sha512_init(void *ctx)
116{
117 struct sha512 *s = ctx;
118 s->len = 0;
119 s->h[0] = 0x6a09e667f3bcc908ULL;
120 s->h[1] = 0xbb67ae8584caa73bULL;
121 s->h[2] = 0x3c6ef372fe94f82bULL;
122 s->h[3] = 0xa54ff53a5f1d36f1ULL;
123 s->h[4] = 0x510e527fade682d1ULL;
124 s->h[5] = 0x9b05688c2b3e6c1fULL;
125 s->h[6] = 0x1f83d9abfb41bd6bULL;
126 s->h[7] = 0x5be0cd19137e2179ULL;
127}
128
129void
130sha512_sum_n(void *ctx, uint8_t *md, int n)
131{
132 struct sha512 *s = ctx;
133 int i;
134
135 pad(s);
136 for (i = 0; i < n; i++) {
137 md[8*i] = s->h[i] >> 56;
138 md[8*i+1] = s->h[i] >> 48;
139 md[8*i+2] = s->h[i] >> 40;
140 md[8*i+3] = s->h[i] >> 32;
141 md[8*i+4] = s->h[i] >> 24;
142 md[8*i+5] = s->h[i] >> 16;
143 md[8*i+6] = s->h[i] >> 8;
144 md[8*i+7] = s->h[i];
145 }
146}
147
148void
149sha512_sum(void *ctx, uint8_t md[SHA512_DIGEST_LENGTH])
150{
151 sha512_sum_n(ctx, md, 8);
152}
153
154void
155sha512_update(void *ctx, const void *m, unsigned long len)
156{
157 struct sha512 *s = ctx;
158 const uint8_t *p = m;
159 unsigned r = s->len % 128;
160
161 s->len += len;
162 if (r) {
163 if (len < 128 - r) {
164 memcpy(s->buf + r, p, len);
165 return;
166 }
167 memcpy(s->buf + r, p, 128 - r);
168 len -= 128 - r;
169 p += 128 - r;
170 processblock(s, s->buf);
171 }
172 for (; len >= 128; len -= 128, p += 128)
173 processblock(s, p);
174 memcpy(s->buf, p, len);
175}
