1 /*
2 * Cryptographic API.
3 *
4 * SHA-3, as specified in
5 * http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf
6 *
7 * SHA-3 code by Jeff Garzik <jeff@garzik.org>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)•
12 * any later version.
13 *
14 */
15 #include <string.h>
16 #include <inttypes.h>
17
18 #include "../os/os.h"
19
20 #include "sha3.h"
21
22 #define KECCAK_ROUNDS 24
23
24 #define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y))))
25
26 static const uint64_t keccakf_rndc[24] = {
27 0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL,
28 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL,
29 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL,
30 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL,
31 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL,
32 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL,
33 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL,
34 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL
35 };
36
37 static const int keccakf_rotc[24] = {
38 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14,
39 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44
40 };
41
42 static const int keccakf_piln[24] = {
43 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4,
44 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1
45 };
46
47 /* update the state with given number of rounds */
48
keccakf(uint64_t st[25])49 static void keccakf(uint64_t st[25])
50 {
51 int i, j, round;
52 uint64_t t, bc[5];
53
54 for (round = 0; round < KECCAK_ROUNDS; round++) {
55
56 /* Theta */
57 for (i = 0; i < 5; i++)
58 bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15]
59 ^ st[i + 20];
60
61 for (i = 0; i < 5; i++) {
62 t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1);
63 for (j = 0; j < 25; j += 5)
64 st[j + i] ^= t;
65 }
66
67 /* Rho Pi */
68 t = st[1];
69 for (i = 0; i < 24; i++) {
70 j = keccakf_piln[i];
71 bc[0] = st[j];
72 st[j] = ROTL64(t, keccakf_rotc[i]);
73 t = bc[0];
74 }
75
76 /* Chi */
77 for (j = 0; j < 25; j += 5) {
78 for (i = 0; i < 5; i++)
79 bc[i] = st[j + i];
80 for (i = 0; i < 5; i++)
81 st[j + i] ^= (~bc[(i + 1) % 5]) &
82 bc[(i + 2) % 5];
83 }
84
85 /* Iota */
86 st[0] ^= keccakf_rndc[round];
87 }
88 }
89
fio_sha3_init(struct fio_sha3_ctx * sctx,unsigned int digest_sz)90 static void fio_sha3_init(struct fio_sha3_ctx *sctx, unsigned int digest_sz)
91 {
92 memset(sctx->st, 0, sizeof(sctx->st));
93 sctx->md_len = digest_sz;
94 sctx->rsiz = 200 - 2 * digest_sz;
95 sctx->rsizw = sctx->rsiz / 8;
96 sctx->partial = 0;
97 memset(sctx->buf, 0, sizeof(sctx->buf));
98 }
99
fio_sha3_224_init(struct fio_sha3_ctx * sctx)100 void fio_sha3_224_init(struct fio_sha3_ctx *sctx)
101 {
102 fio_sha3_init(sctx, SHA3_224_DIGEST_SIZE);
103 }
104
fio_sha3_256_init(struct fio_sha3_ctx * sctx)105 void fio_sha3_256_init(struct fio_sha3_ctx *sctx)
106 {
107 fio_sha3_init(sctx, SHA3_256_DIGEST_SIZE);
108 }
109
fio_sha3_384_init(struct fio_sha3_ctx * sctx)110 void fio_sha3_384_init(struct fio_sha3_ctx *sctx)
111 {
112 fio_sha3_init(sctx, SHA3_384_DIGEST_SIZE);
113 }
114
fio_sha3_512_init(struct fio_sha3_ctx * sctx)115 void fio_sha3_512_init(struct fio_sha3_ctx *sctx)
116 {
117 fio_sha3_init(sctx, SHA3_512_DIGEST_SIZE);
118 }
119
fio_sha3_update(struct fio_sha3_ctx * sctx,const uint8_t * data,unsigned int len)120 int fio_sha3_update(struct fio_sha3_ctx *sctx, const uint8_t *data,
121 unsigned int len)
122 {
123 unsigned int done;
124 const uint8_t *src;
125
126 done = 0;
127 src = data;
128
129 if ((sctx->partial + len) > (sctx->rsiz - 1)) {
130 if (sctx->partial) {
131 done = -sctx->partial;
132 memcpy(sctx->buf + sctx->partial, data,
133 done + sctx->rsiz);
134 src = sctx->buf;
135 }
136
137 do {
138 unsigned int i;
139
140 for (i = 0; i < sctx->rsizw; i++)
141 sctx->st[i] ^= ((uint64_t *) src)[i];
142 keccakf(sctx->st);
143
144 done += sctx->rsiz;
145 src = data + done;
146 } while (done + (sctx->rsiz - 1) < len);
147
148 sctx->partial = 0;
149 }
150 memcpy(sctx->buf + sctx->partial, src, len - done);
151 sctx->partial += (len - done);
152
153 return 0;
154 }
155
fio_sha3_final(struct fio_sha3_ctx * sctx)156 void fio_sha3_final(struct fio_sha3_ctx *sctx)
157 {
158 unsigned int i, inlen = sctx->partial;
159
160 sctx->buf[inlen++] = 0x06;
161 memset(sctx->buf + inlen, 0, sctx->rsiz - inlen);
162 sctx->buf[sctx->rsiz - 1] |= 0x80;
163
164 for (i = 0; i < sctx->rsizw; i++)
165 sctx->st[i] ^= ((uint64_t *) sctx->buf)[i];
166
167 keccakf(sctx->st);
168
169 for (i = 0; i < sctx->rsizw; i++)
170 sctx->st[i] = cpu_to_le64(sctx->st[i]);
171
172 memcpy(sctx->sha, sctx->st, sctx->md_len);
173 }
174