Sodium Functions
PHP Manual

sodium_crypto_core_ristretto255_scalar_sub

Subtracts a scalar value

Description

string sodium_crypto_core_ristretto255_scalar_sub(string $x, string $y)

Subtracts a scalar y from x. Available as of libsodium 1.0.18.

Warning

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

Parameters

x

Scalar, representing the X coordinate.

y

Scalar, representing the Y coordinate.

Return Values

Returns a 32-byte random string.

Examples

Example #1 sodium_crypto_core_ristretto255_scalar_sub example

<?php

$foo = sodium_crypto_core_ristretto255_scalar_random();
$bar = sodium_crypto_core_ristretto255_scalar_random();

$value = sodium_crypto_core_ristretto255_scalar_add($foo, $bar);
$value = sodium_crypto_core_ristretto255_scalar_sub($value, $bar);

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

The above example will output:

bool(true)

See Also

  • sodium_crypto_core_ristretto255_scalar_random
  • sodium_crypto_core_ristretto255_scalar_add