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| 1 /*- | |
| 2 * Copyright 2009 Colin Percival | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions | |
| 7 * are met: | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 24 * SUCH DAMAGE. | |
| 25 * | |
| 26 * This file was originally written by Colin Percival as part of the Tarsnap | |
| 27 * online backup system. | |
| 28 */ | |
| 29 #include "scrypt_platform.h" | |
| 30 | |
| 31 #include <sys/time.h> | |
| 32 | |
| 33 #include <stdint.h> | |
| 34 #include <stdio.h> | |
| 35 #include <time.h> | |
| 36 | |
| 37 #include "crypto_scrypt.h" | |
| 38 | |
| 39 #include "scryptenc_cpuperf.h" | |
| 40 | |
| 41 #ifdef HAVE_CLOCK_GETTIME | |
| 42 | |
| 43 static clock_t clocktouse; | |
| 44 | |
| 45 static int | |
| 46 getclockres(double * resd) | |
| 47 { | |
| 48 struct timespec res; | |
| 49 | |
| 50 /* | |
| 51 * Try clocks in order of preference until we find one which works. | |
| 52 * (We assume that if clock_getres works, clock_gettime will, too.) | |
| 53 * The use of if/else/if/else/if/else rather than if/elif/elif/else | |
| 54 * is ugly but legal, and allows us to #ifdef things appropriately. | |
| 55 */ | |
| 56 #ifdef CLOCK_VIRTUAL | |
| 57 if (clock_getres(CLOCK_VIRTUAL, &res) == 0) | |
| 58 clocktouse = CLOCK_VIRTUAL; | |
| 59 else | |
| 60 #endif | |
| 61 #ifdef CLOCK_MONOTONIC | |
| 62 if (clock_getres(CLOCK_MONOTONIC, &res) == 0) | |
| 63 clocktouse = CLOCK_MONOTONIC; | |
| 64 else | |
| 65 #endif | |
| 66 if (clock_getres(CLOCK_REALTIME, &res) == 0) | |
| 67 clocktouse = CLOCK_REALTIME; | |
| 68 else | |
| 69 return (-1); | |
| 70 | |
| 71 /* Convert clock resolution to a double. */ | |
| 72 *resd = res.tv_sec + res.tv_nsec * 0.000000001; | |
| 73 | |
| 74 return (0); | |
| 75 } | |
| 76 | |
| 77 static int | |
| 78 getclocktime(struct timespec * ts) | |
| 79 { | |
| 80 | |
| 81 if (clock_gettime(clocktouse, ts)) | |
| 82 return (-1); | |
| 83 | |
| 84 return (0); | |
| 85 } | |
| 86 | |
| 87 #else | |
| 88 static int | |
| 89 getclockres(double * resd) | |
| 90 { | |
| 91 | |
| 92 *resd = 1.0 / CLOCKS_PER_SEC; | |
| 93 | |
| 94 return (0); | |
| 95 } | |
| 96 | |
| 97 static int | |
| 98 getclocktime(struct timespec * ts) | |
| 99 { | |
| 100 struct timeval tv; | |
| 101 | |
| 102 if (gettimeofday(&tv, NULL)) | |
| 103 return (-1); | |
| 104 ts->tv_sec = tv.tv_sec; | |
| 105 ts->tv_nsec = tv.tv_usec * 1000; | |
| 106 | |
| 107 return (0); | |
| 108 } | |
| 109 #endif | |
| 110 | |
| 111 static int | |
| 112 getclockdiff(struct timespec * st, double * diffd) | |
| 113 { | |
| 114 struct timespec en; | |
| 115 | |
| 116 if (getclocktime(&en)) | |
| 117 return (1); | |
| 118 *diffd = (en.tv_nsec - st->tv_nsec) * 0.000000001 + | |
| 119 (en.tv_sec - st->tv_sec); | |
| 120 | |
| 121 return (0); | |
| 122 } | |
| 123 | |
| 124 /** | |
| 125 * scryptenc_cpuperf(opps): | |
| 126 * Estimate the number of salsa20/8 cores which can be executed per second, | |
| 127 * and return the value via opps. | |
| 128 */ | |
| 129 int | |
| 130 scryptenc_cpuperf(double * opps) | |
| 131 { | |
| 132 struct timespec st; | |
| 133 double resd, diffd; | |
| 134 uint64_t i = 0; | |
| 135 | |
| 136 /* Get the clock resolution. */ | |
| 137 if (getclockres(&resd)) | |
| 138 return (2); | |
| 139 | |
| 140 #ifdef DEBUG | |
| 141 fprintf(stderr, "Clock resolution is %f\n", resd); | |
| 142 #endif | |
| 143 | |
| 144 /* Loop until the clock ticks. */ | |
| 145 if (getclocktime(&st)) | |
| 146 return (2); | |
| 147 do { | |
| 148 /* Do an scrypt. */ | |
| 149 if (crypto_scrypt(NULL, 0, NULL, 0, 16, 1, 1, NULL, 0)) | |
| 150 return (3); | |
| 151 | |
| 152 /* Has the clock ticked? */ | |
| 153 if (getclockdiff(&st, &diffd)) | |
| 154 return (2); | |
| 155 if (diffd > 0) | |
| 156 break; | |
| 157 } while (1); | |
| 158 | |
| 159 /* Could how many scryps we can do before the next tick. */ | |
| 160 if (getclocktime(&st)) | |
| 161 return (2); | |
| 162 do { | |
| 163 /* Do an scrypt. */ | |
| 164 if (crypto_scrypt(NULL, 0, NULL, 0, 128, 1, 1, NULL, 0)) | |
| 165 return (3); | |
| 166 | |
| 167 /* We invoked the salsa20/8 core 512 times. */ | |
| 168 i += 512; | |
| 169 | |
| 170 /* Check if we have looped for long enough. */ | |
| 171 if (getclockdiff(&st, &diffd)) | |
| 172 return (2); | |
| 173 if (diffd > resd) | |
| 174 break; | |
| 175 } while (1); | |
| 176 | |
| 177 #ifdef DEBUG | |
| 178 fprintf(stderr, "%ju salsa20/8 cores performed in %f seconds\n", | |
| 179 (uintmax_t)i, diffd); | |
| 180 #endif | |
| 181 | |
| 182 /* We can do approximately i salsa20/8 cores per diffd seconds. */ | |
| 183 *opps = i / diffd; | |
| 184 return (0); | |
| 185 } | |
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