<?php
declare(strict_types=1);
namespace ParagonIE\Halite;
use ParagonIE\Halite\{
Alerts as CryptoException,
Asymmetric\EncryptionPublicKey,
Asymmetric\EncryptionSecretKey
};
/**
* Describes a pair of secret and public keys
*/
final class EncryptionKeyPair extends KeyPair
{
/**
*
* Pass it a secret key, it will automatically generate a public key
*
* @param ...Key $keys
*/
public function __construct(Key ...$keys)
{
switch (\count($keys)) {
/**
* If we received two keys, it must be an asymmetric secret key and
* an asymmetric public key, in either order.
*/
case 2:
if (!$keys[0]->isAsymmetricKey() || !$keys[1]->isAsymmetricKey()) {
throw new CryptoException\InvalidKey(
'Only keys intended for asymmetric cryptography can be used in a KeyPair object'
);
}
if ($keys[0]->isPublicKey()) {
if ($keys[1]->isPublicKey()) {
throw new CryptoException\InvalidKey(
'Both keys cannot be public keys'
);
}
$this->setupKeyPair(
$keys[1] instanceof EncryptionSecretKey
? $keys[1]
: new EncryptionSecretKey($keys[1]->get())
);
} elseif ($keys[1]->isPublicKey()) {
$this->setupKeyPair(
$keys[0] instanceof EncryptionSecretKey
? $keys[0]
: new EncryptionSecretKey($keys[0]->get())
);
} else {
throw new CryptoException\InvalidKey(
'Both keys cannot be secret keys'
);
}
break;
/**
* If we only received one key, it must be an asymmetric secret key!
*/
case 1:
if (!$keys[0]->isAsymmetricKey()) {
throw new CryptoException\InvalidKey(
'Only keys intended for asymmetric cryptography can be used in a KeyPair object'
);
}
if ($keys[0]->isPublicKey()) {
// Ever heard of the Elliptic Curve Discrete Logarithm Problem?
throw new CryptoException\InvalidKey(
'We cannot generate a valid keypair given only a public key; we can given only a secret key, however.'
);
}
$this->setupKeyPair(
$keys[0] instanceof EncryptionSecretKey
? $keys[0]
: new EncryptionSecretKey($keys[0]->get())
);
break;
default:
throw new \InvalidArgumentException(
'Halite\\EncryptionKeyPair expects 1 or 2 keys'
);
}
}
/**
* Set up our key pair
*
* @param EncryptionSecretKey $secret
*/
protected function setupKeyPair(EncryptionSecretKey $secret)
{
$this->secret_key = $secret;
$this->public_key = $this->secret_key->derivePublicKey();
}
}
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