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iEval git - authen-passphrase-scrypt.git/blob - scrypt-1.2.1/lib/scryptenc/scryptenc_cpuperf.c
2 * Copyright 2009 Colin Percival
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * This file was originally written by Colin Percival as part of the Tarsnap
27 * online backup system.
29 #include "scrypt_platform.h"
37 #include "crypto_scrypt.h"
39 #include "scryptenc_cpuperf.h"
41 #ifdef HAVE_CLOCK_GETTIME
43 static clockid_t clocktouse
;
46 getclockres(double * resd
)
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.
57 if (clock_getres(CLOCK_VIRTUAL
, &res
) == 0)
58 clocktouse
= CLOCK_VIRTUAL
;
61 #ifdef CLOCK_MONOTONIC
62 if (clock_getres(CLOCK_MONOTONIC
, &res
) == 0)
63 clocktouse
= CLOCK_MONOTONIC
;
66 if (clock_getres(CLOCK_REALTIME
, &res
) == 0)
67 clocktouse
= CLOCK_REALTIME
;
71 /* Convert clock resolution to a double. */
72 *resd
= res
.tv_sec
+ res
.tv_nsec
* 0.000000001;
78 getclocktime(struct timespec
* ts
)
81 if (clock_gettime(clocktouse
, ts
))
89 getclockres(double * resd
)
92 *resd
= 1.0 / CLOCKS_PER_SEC
;
98 getclocktime(struct timespec
* ts
)
102 if (gettimeofday(&tv
, NULL
))
104 ts
->tv_sec
= tv
.tv_sec
;
105 ts
->tv_nsec
= tv
.tv_usec
* 1000;
112 getclockdiff(struct timespec
* st
, double * diffd
)
116 if (getclocktime(&en
))
118 *diffd
= (en
.tv_nsec
- st
->tv_nsec
) * 0.000000001 +
119 (en
.tv_sec
- st
->tv_sec
);
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.
130 scryptenc_cpuperf(double * opps
)
136 /* Get the clock resolution. */
137 if (getclockres(&resd
))
141 fprintf(stderr
, "Clock resolution is %f\n", resd
);
144 /* Loop until the clock ticks. */
145 if (getclocktime(&st
))
149 if (crypto_scrypt(NULL
, 0, NULL
, 0, 16, 1, 1, NULL
, 0))
152 /* Has the clock ticked? */
153 if (getclockdiff(&st
, &diffd
))
159 /* Count how many scrypts we can do before the next tick. */
160 if (getclocktime(&st
))
164 if (crypto_scrypt(NULL
, 0, NULL
, 0, 128, 1, 1, NULL
, 0))
167 /* We invoked the salsa20/8 core 512 times. */
170 /* Check if we have looped for long enough. */
171 if (getclockdiff(&st
, &diffd
))
178 fprintf(stderr
, "%ju salsa20/8 cores performed in %f seconds\n",
179 (uintmax_t)i
, diffd
);
182 /* We can do approximately i salsa20/8 cores per diffd seconds. */
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