1 /* $OpenBSD: sha3.c,v 1.16 2024/11/23 15:38:12 jsing Exp $ */ 2 /* 3 * The MIT License (MIT) 4 * 5 * Copyright (c) 2015 Markku-Juhani O. Saarinen 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in all 15 * copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 * SOFTWARE. 24 */ 25 26 #include <endian.h> 27 #include <string.h> 28 29 #include "sha3_internal.h" 30 31 #define KECCAKF_ROUNDS 24 32 33 #define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y)))) 34 35 static const uint64_t sha3_keccakf_rndc[24] = { 36 0x0000000000000001, 0x0000000000008082, 0x800000000000808a, 37 0x8000000080008000, 0x000000000000808b, 0x0000000080000001, 38 0x8000000080008081, 0x8000000000008009, 0x000000000000008a, 39 0x0000000000000088, 0x0000000080008009, 0x000000008000000a, 40 0x000000008000808b, 0x800000000000008b, 0x8000000000008089, 41 0x8000000000008003, 0x8000000000008002, 0x8000000000000080, 42 0x000000000000800a, 0x800000008000000a, 0x8000000080008081, 43 0x8000000000008080, 0x0000000080000001, 0x8000000080008008 44 }; 45 static const int sha3_keccakf_rotc[24] = { 46 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 47 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44 48 }; 49 static const int sha3_keccakf_piln[24] = { 50 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 51 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1 52 }; 53 54 static void 55 sha3_keccakf(uint64_t st[25]) 56 { 57 uint64_t t, bc[5]; 58 int i, j, r; 59 60 for (i = 0; i < 25; i++) 61 st[i] = le64toh(st[i]); 62 63 for (r = 0; r < KECCAKF_ROUNDS; r++) { 64 65 /* Theta */ 66 for (i = 0; i < 5; i++) 67 bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15] ^ st[i + 20]; 68 69 for (i = 0; i < 5; i++) { 70 t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1); 71 for (j = 0; j < 25; j += 5) 72 st[j + i] ^= t; 73 } 74 75 /* Rho Pi */ 76 t = st[1]; 77 for (i = 0; i < 24; i++) { 78 j = sha3_keccakf_piln[i]; 79 bc[0] = st[j]; 80 st[j] = ROTL64(t, sha3_keccakf_rotc[i]); 81 t = bc[0]; 82 } 83 84 /* Chi */ 85 for (j = 0; j < 25; j += 5) { 86 for (i = 0; i < 5; i++) 87 bc[i] = st[j + i]; 88 for (i = 0; i < 5; i++) 89 st[j + i] ^= (~bc[(i + 1) % 5]) & bc[(i + 2) % 5]; 90 } 91 92 /* Iota */ 93 st[0] ^= sha3_keccakf_rndc[r]; 94 } 95 96 for (i = 0; i < 25; i++) 97 st[i] = htole64(st[i]); 98 } 99 100 int 101 sha3_init(sha3_ctx *c, int mdlen) 102 { 103 if (mdlen < 0 || mdlen >= KECCAK_BYTE_WIDTH / 2) 104 return 0; 105 106 memset(c, 0, sizeof(*c)); 107 108 c->mdlen = mdlen; 109 c->rsize = KECCAK_BYTE_WIDTH - 2 * mdlen; 110 111 return 1; 112 } 113 114 int 115 sha3_update(sha3_ctx *c, const void *data, size_t len) 116 { 117 size_t i, j; 118 119 j = c->pt; 120 for (i = 0; i < len; i++) { 121 c->state.b[j++] ^= ((const uint8_t *) data)[i]; 122 if (j >= c->rsize) { 123 sha3_keccakf(c->state.q); 124 j = 0; 125 } 126 } 127 c->pt = j; 128 129 return 1; 130 } 131 132 int 133 sha3_final(void *md, sha3_ctx *c) 134 { 135 int i; 136 137 c->state.b[c->pt] ^= 0x06; 138 c->state.b[c->rsize - 1] ^= 0x80; 139 sha3_keccakf(c->state.q); 140 141 for (i = 0; i < c->mdlen; i++) { 142 ((uint8_t *) md)[i] = c->state.b[i]; 143 } 144 145 return 1; 146 } 147 148 /* SHAKE128 and SHAKE256 extensible-output functionality. */ 149 void 150 shake_xof(sha3_ctx *c) 151 { 152 c->state.b[c->pt] ^= 0x1F; 153 c->state.b[c->rsize - 1] ^= 0x80; 154 sha3_keccakf(c->state.q); 155 c->pt = 0; 156 } 157 158 void 159 shake_out(sha3_ctx *c, void *out, size_t len) 160 { 161 size_t i, j; 162 163 j = c->pt; 164 for (i = 0; i < len; i++) { 165 if (j >= c->rsize) { 166 sha3_keccakf(c->state.q); 167 j = 0; 168 } 169 ((uint8_t *) out)[i] = c->state.b[j++]; 170 } 171 c->pt = j; 172 } 173