---
name: "lib1305-speed"
section: "1"
platform: "linux"
package: "poly1305"
version: "0~20250415-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/lib1305-speed"
---

# lib1305-speed(1)

### NAME

lib1305-speed - run some lib1305 speed tests

### SYNOPSIS

-

  ```
  lib1305-speed
  ```

### DESCRIPTION

lib1305-speed runs some tests of the speed of the lib1305 implementation of Poly1305.

The lib1305-speed output format is subject to change. Examples of output lines with the current format, from a lib1305-speed run on an Intel Skylake CPU core, include the following:

-

  ```
  onetimeauth_poly1305 selected implementation amd64-mxaa-g24 compiler clang -Wall -fPIC -fwrapv -Qunused-arguments -O2 -mbmi -mbmi2 -mtune=skylake; Ubuntu clang version 14.0.0-1ubuntu1.1; Target: x86_64-pc-linux-gnu; Thread model: posix; InstalledDir: /usr/bin
  onetimeauth_poly1305_verify selected 8090 6563 +453+92+44+41-4-27+8-32-12+3-5-15+37-28+26+19-18-48-15+28+3+13+66-42+41-25-10+2-9-36+18-64
  ```

These lines say that the automatically selected implementation for onetimeauth\_poly1305\_verify was the amd64-mxaa-g24 implementation compiled with the clang options shown, taking an interquartile mean (IQM) of 6563 CPU cycles for 8090-byte inputs. The numbers 6563 +453+92... show the timings for a series of consecutive operations: the IQM was 6563 cycles, the first run took 453 cycles more than the IQM, the second run took 92 cycles more than the IQM, etc.

### SEE ALSO

[**lib1305**(3)](/lib1305/3.md)