lib25519

In the following speed table, smaller numbers are better. The numbers are median single-core cycle counts on various microarchitectures. Overclocking is disabled.

The table reports cycle counts from lib25519 and, for comparison, OpenSSL and s2n-bignum. For comparability to OpenSSL's speed-testing utility, the OpenSSL cycle counts omit various OpenSSL overheads; see below for details. The s2n-bignum and lib25519 cycle counts include all overheads. There is also a lib25519+s2n line showing separate measurements of lib25519 after the optional pre-configuration ./use-s2n-bignum step.

╬╝arch software X key X dh X batch Ed key Ed sign Ed verif Ed MSM
Golden Cove (2021) OpenSSL 119777 103594 121526 95750 319234
lib25519 23332 69037 49966 24373 28697 91956 37103
lib25519+s2n 23889 68964 49907 24401 28030 93962 36701
s2n-bignum 24257 75395
Firestorm (2020) OpenSSL 59900 65400 60800 55900 195400
lib25519 28500 57100 56750 28500 31300 204200 59900
lib25519+s2n 21700 57900 56831 29500 32400 215900 61662
s2n-bignum 14300 44200
Zen 3 (2020) OpenSSL 121785 112526 124551 111757 372577
lib25519 25621 73101 47967 26438 29800 111248 41567
lib25519+s2n 25614 73250 47816 26476 29876 111301 41346
s2n-bignum 26238 89699
Tiger Lake (2020) OpenSSL 116192 119125 119341 111360 371294
lib25519 26662 64680 21684 27321 31241 107766 39736
lib25519+s2n 26245 64685 21695 27542 31152 108605 39347
s2n-bignum 26474 83168
Zen 2 (2019) OpenSSL 131187 114889 133766 121192 393580
lib25519 27538 100750 73662 28448 31621 130793 46115
lib25519+s2n 26700 94659 74817 28253 31487 130884 46111
s2n-bignum 27058 92075
Goldmont (2016) OpenSSL 255650 273638 269190 228278 746606
lib25519 93894 280998 282937 182176 106552 348154 111511
lib25519+s2n 76252 255310 258451 97018 106718 341734 97353
s2n-bignum 77436 255312
Cortex-A72 (2016) OpenSSL 165596 424757 173844 134485 423509
lib25519 107170 331177 331403 108422 116220 407344 118316
lib25519+s2n 66463 136554 136521 108048 115264 410675 117761
s2n-bignum 67271 136516
Skylake (2015) OpenSSL 134951 118458 138768 124961 411673
lib25519 27802 83452 62451 28608 32026 107652 41742
lib25519+s2n 27816 83223 63022 28583 31979 105726 41853
s2n-bignum 28806 84561
Airmont (2015) OpenSSL 314248 618875 326604 276991 852228
lib25519 143716 449155 449333 151077 167509 555437 155354
lib25519+s2n 115797 432042 432588 150556 168440 557483 155190
s2n-bignum 116864 432414
Broadwell (2014) OpenSSL 128717 121228 132360 120321 393241
lib25519 29156 84649 73313 29705 33972 109784 41100
lib25519+s2n 29034 87200 72483 29905 33799 109508 41852
s2n-bignum 31396 87934
Haswell (2013) OpenSSL 134317 163773 139345 125387 407967
lib25519 41558 115276 76694 42365 46236 153852 58279
lib25519+s2n 41508 117407 76569 42406 46859 155814 57725
s2n-bignum 45860 160318
Cortex-A53 (2012) OpenSSL 271122 523848 277838 216810 547938
lib25519 152424 467492 466748 154103 163666 598089 173073
lib25519+s2n 116946 163009 165112 153300 162717 600206 170632
s2n-bignum 120158 163155
Core 2 (2006) OpenSSL 274293 326943 282501 240597 741906
lib25519 95814 301014 299719 99243 108216 359289 105870
lib25519+s2n 73170 262746 262705 99027 108315 360225 105163
s2n-bignum 80703 262971

Microarchitectures are listed in reverse chronological order of when they were introduced. Each library is assigned one foreground color in the table.

In the lib25519 distribution, command/lib25519-speed.c measures lib25519; benchmarks/*-* is the output of lib25519-speed on various machines; speedcomparison/openssl/* has code to measure OpenSSL, and measurements from various machines; speedcomparison/s2n/* has code to measure s2n-bignum, and measurements from various machines; and autogen/md-speed extracts the table from those measurements. OpenSSL benchmarks use version 3.2.1 (2024.01.30); s2n-bignum benchmarks use commit acbb18e6343f12a7944de72c1ec0991739600f8c (2024.03.18).

The table reports only median cycle counts; see the full output files for differences between multiple measurements and the median. The table reports the following major operations:


Version: This is version 2024.03.21 of the "Speed" web page.