<?php
if (!extension_loaded("libsodium")) {
exit(0);
}
include "../autoload.php";
$salt = Salt::instance();
$keys = crypto_sign_keypair();
$sodium_sk = crypto_sign_secretkey($keys);
$sodium_pk = crypto_sign_publickey($keys);
$sk = FieldElement::fromString($sodium_sk);
$pk = FieldElement::fromString($sodium_pk);
$msg = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
$sodium_sm = crypto_sign($msg, $sodium_sk);
$signed_msg = $salt->crypto_sign($msg, strlen($msg), $sk);
if (sodium_memcmp($sodium_sm, $signed_msg->toString()) === 0) {
echo $sodium_sm . "\n";
echo $signed_msg->toString() . "\n\n";
} else {
echo "invalid signed message";
exit(0);
}
$sodium_open_msg = crypto_sign_open($sodium_sm, $sodium_pk);
$plaintext = $salt->crypto_sign_open($signed_msg, count($signed_msg), $pk);
if ($plaintext === false) {
echo "debug time...";
exit(0);
}
if (sodium_memcmp($sodium_open_msg, $plaintext->toString()) === 0) {
echo $sodium_open_msg . "\n";
echo $plaintext->toString() . "\n";
/**
* Get bytes presentation from a value.
*
* @param mixed
* @return FieldElement
*/
public static function decodeInput($value)
{
if (is_string($value)) {
return FieldElement::fromString($value);
} else {
if ($value instanceof FieldElement) {
return $value;
} else {
if ($value instanceof SplFixedArray) {
return FieldElement::fromArray($value->toArray(), false);
} else {
if ((array) $value === $value) {
return FieldElement::fromArray($value, false);
}
}
}
}
throw new SaltException('Unexpected input');
}
public static function fromBase64($base64)
{
return FieldElement::fromString(base64_decode($base64, true));
}
/**
* Derive the public key
*
* @param string $privateKey in binary
* @return string public key as binary
*/
public final function derivePublicKey($privateKey)
{
$privateKeyElement = \FieldElement::fromString($privateKey);
return Salt::instance()->crypto_scalarmult_base($privateKeyElement)->toString();
}
