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