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<sodium_crypto_core_ristretto255_scalar_subsodium_crypto_generichash>
^Sodium FunctionsLast updated: Mon, 26 Oct 2026

sodium_crypto_core_ristretto255_sub

(PHP 8 >= 8.1.0)

sodium_crypto_core_ristretto255_sub — Subtracts an element

Description

function sodium_crypto_core_ristretto255_sub(string $p, string $q): string

Subtracts an element q from p. Available as of libsodium 1.0.18.

Warning

This function is currently not documented; only its argument list is available.

Parameters

p

An element.

q

An element.

Return Values

Returns a 32-byte random string.

Examples

Example #1 sodium_crypto_core_ristretto255_sub() example

<?php

$foo = sodium_crypto_core_ristretto255_random();
$bar = sodium_crypto_core_ristretto255_random();

$value = sodium_crypto_core_ristretto255_add($foo, $bar);
$value = sodium_crypto_core_ristretto255_sub($value, $bar);

var_dump(hash_equals($foo, $value));
?>

The above example will output:

bool(true)

See Also


<sodium_crypto_core_ristretto255_scalar_subsodium_crypto_generichash>
^Sodium FunctionsLast updated: Mon, 26 Oct 2026