(PHP 8 >= 8.1.0)
sodium_crypto_core_ristretto255_scalar_sub — Subtracts a scalar value
Subtracts a scalar y from x.
Available as of libsodium 1.0.18.
This function is currently not documented; only its argument list is available.
xScalar, representing the X coordinate.
yScalar, representing the Y coordinate.
Returns a 32-byte random string.
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)