<?php
declare(strict_types=1);
namespace ParagonIE\HPKE\AEAD;
use ParagonIE\HPKE\HPKE;
use ParagonIE\HPKE\HPKEException;
use ParagonIE\HPKE\Interfaces\AEADInterface;
use ParagonIE\HPKE\Interfaces\KemInterface;
use ParagonIE\HPKE\Interfaces\SymmetricKeyInterface;
use ParagonIE\HPKE\SymmetricKey;
class ExportOnly implements AEADInterface
{
const AEAD_ID = "\xFF\xFF";
public function getAeadId(): string
{
return self::AEAD_ID;
}
/**
* @throws HPKEException
*/
public function keyLength(): int
{
throw new HPKEException('Export-Only AEAD has no key length');
}
/**
* @throws HPKEException
*/
public function nonceLength(): int
{
throw new HPKEException('Export-Only AEAD has no nonce length');
}
/**
* @throws HPKEException
*/
public function tagLength(): int
{
throw new HPKEException('Export-Only AEAD has no tag length');
}
public function export(
HPKE $hpke,
SymmetricKeyInterface|string $exporterSecret,
string $exporterContext,
int $length
): string {
return $hpke->labeledExpand(
$exporterSecret,
$exporterContext,
'sec',
$length
);
}
/**
* @throws HPKEException
*/
public function encrypt(
#[\SensitiveParameter] SymmetricKey $key,
#[\SensitiveParameter] string $plaintext,
string $nonce,
string $aad = ''
): array {
throw new HPKEException('Cannot encrypt using Export-Only AEAD');
}
/**
* @throws HPKEException
*/
public function decrypt(
#[\SensitiveParameter] SymmetricKey $key,
string $ciphertext,
string $tag,
string $nonce,
string $aad = ''
): string {
throw new HPKEException('Cannot decrypt using Export-Only AEAD');
}
}
|
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