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 SignatureSecretKey ? $keys[1] : new SignatureSecretKey(new HiddenString($keys[1]->getRawKeyMaterial())));
} elseif ($keys[1]->isPublicKey()) {
$this->setupKeyPair($keys[0] instanceof SignatureSecretKey ? $keys[0] : new SignatureSecretKey(new HiddenString($keys[0]->getRawKeyMaterial())));
} 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!
*/
/**
* 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 SignatureSecretKey ? $keys[0] : new SignatureSecretKey(new HiddenString($keys[0]->getRawKeyMaterial())));
break;
default:
throw new \InvalidArgumentException('Halite\\EncryptionKeyPair expects 1 or 2 keys');
}
}