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<?php |
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declare(strict_types = 1); |
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namespace Sop\CryptoTypes\Asymmetric\RSA; |
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use Sop\ASN1\Type\Constructed\Sequence; |
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use Sop\ASN1\Type\Primitive\Integer; |
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use Sop\ASN1\Type\UnspecifiedType; |
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use Sop\CryptoEncoding\PEM; |
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use Sop\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier; |
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use Sop\CryptoTypes\AlgorithmIdentifier\Asymmetric\RSAEncryptionAlgorithmIdentifier; |
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use Sop\CryptoTypes\AlgorithmIdentifier\Feature\AlgorithmIdentifierType; |
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use Sop\CryptoTypes\Asymmetric\PublicKey; |
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use Sop\CryptoTypes\Asymmetric\PublicKeyInfo; |
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/** |
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* Implements PKCS #1 RSAPublicKey ASN.1 type. |
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* |
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* @see https://tools.ietf.org/html/rfc2437#section-11.1.1 |
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*/ |
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class RSAPublicKey extends PublicKey |
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{ |
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/** |
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* Modulus as a base 10 integer. |
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* |
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* @var string |
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*/ |
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protected $_modulus; |
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/** |
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* Public exponent as a base 10 integer. |
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* |
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* @var string |
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*/ |
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protected $_publicExponent; |
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/** |
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* Constructor. |
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* |
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* @param int|string $n Modulus |
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* @param int|string $e Public exponent |
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*/ |
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public function __construct($n, $e) |
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{ |
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$this->_modulus = strval($n); |
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$this->_publicExponent = strval($e); |
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} |
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/** |
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* Initialize from ASN.1. |
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* |
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* @param Sequence $seq |
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* |
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* @return self |
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*/ |
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public static function fromASN1(Sequence $seq): RSAPublicKey |
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{ |
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$n = $seq->at(0)->asInteger()->number(); |
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$e = $seq->at(1)->asInteger()->number(); |
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return new self($n, $e); |
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} |
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/** |
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* Initialize from DER data. |
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* |
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* @param string $data |
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* |
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* @return self |
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*/ |
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public static function fromDER(string $data): RSAPublicKey |
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{ |
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return self::fromASN1(UnspecifiedType::fromDER($data)->asSequence()); |
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} |
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/** |
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* @see PublicKey::fromPEM() |
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* |
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* @param PEM $pem |
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* |
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* @throws \UnexpectedValueException |
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* |
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* @return self |
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*/ |
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public static function fromPEM(PEM $pem): RSAPublicKey |
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{ |
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switch ($pem->type()) { |
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case PEM::TYPE_RSA_PUBLIC_KEY: |
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return self::fromDER($pem->data()); |
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case PEM::TYPE_PUBLIC_KEY: |
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$pki = PublicKeyInfo::fromDER($pem->data()); |
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if (AlgorithmIdentifier::OID_RSA_ENCRYPTION !== |
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$pki->algorithmIdentifier()->oid()) { |
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throw new \UnexpectedValueException('Not an RSA public key.'); |
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} |
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return self::fromDER($pki->publicKeyData()); |
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} |
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throw new \UnexpectedValueException('Invalid PEM type ' . $pem->type()); |
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} |
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/** |
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* Get modulus. |
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* |
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* @return string Base 10 integer |
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*/ |
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public function modulus(): string |
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{ |
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return $this->_modulus; |
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} |
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/** |
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* Get public exponent. |
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* |
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* @return string Base 10 integer |
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*/ |
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public function publicExponent(): string |
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{ |
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return $this->_publicExponent; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function algorithmIdentifier(): AlgorithmIdentifierType |
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{ |
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return new RSAEncryptionAlgorithmIdentifier(); |
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} |
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/** |
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* Generate ASN.1 structure. |
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* |
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* @return Sequence |
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*/ |
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public function toASN1(): Sequence |
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{ |
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return new Sequence(new Integer($this->_modulus), |
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new Integer($this->_publicExponent)); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function toDER(): string |
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{ |
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return $this->toASN1()->toDER(); |
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} |
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/** |
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* Generate PEM. |
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* |
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* @return PEM |
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*/ |
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public function toPEM(): PEM |
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{ |
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return new PEM(PEM::TYPE_RSA_PUBLIC_KEY, $this->toDER()); |
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} |
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} |
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sop /
crypto-types
