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 (at) 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 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 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 } 99 100 void fio_sha3_224_init(struct fio_sha3_ctx *sctx) 101 { 102 fio_sha3_init(sctx, SHA3_224_DIGEST_SIZE); 103 } 104 105 void fio_sha3_256_init(struct fio_sha3_ctx *sctx) 106 { 107 fio_sha3_init(sctx, SHA3_256_DIGEST_SIZE); 108 } 109 110 void fio_sha3_384_init(struct fio_sha3_ctx *sctx) 111 { 112 fio_sha3_init(sctx, SHA3_384_DIGEST_SIZE); 113 } 114 115 void fio_sha3_512_init(struct fio_sha3_ctx *sctx) 116 { 117 fio_sha3_init(sctx, SHA3_512_DIGEST_SIZE); 118 } 119 120 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 } 155 156 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
