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<?php
declare(strict_types=1);
namespace SpomkyLabs\Pki\CryptoBridge\Crypto;
use function array_key_exists;
use function mb_strlen;
use const OPENSSL_ALGO_MD4;
use const OPENSSL_ALGO_MD5;
use const OPENSSL_ALGO_SHA1;
use const OPENSSL_ALGO_SHA224;
use const OPENSSL_ALGO_SHA256;
use const OPENSSL_ALGO_SHA384;
use const OPENSSL_ALGO_SHA512;
use const OPENSSL_RAW_DATA;
use const OPENSSL_ZERO_PADDING;
use RuntimeException;
use SpomkyLabs\Pki\CryptoBridge\Crypto;
use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\AlgorithmIdentifier;
use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\Cipher\BlockCipherAlgorithmIdentifier;
use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\Cipher\CipherAlgorithmIdentifier;
use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\Cipher\RC2CBCAlgorithmIdentifier;
use SpomkyLabs\Pki\CryptoTypes\AlgorithmIdentifier\Feature\SignatureAlgorithmIdentifier;
use SpomkyLabs\Pki\CryptoTypes\Asymmetric\PrivateKeyInfo;
use SpomkyLabs\Pki\CryptoTypes\Asymmetric\PublicKeyInfo;
use SpomkyLabs\Pki\CryptoTypes\Signature\Signature;
use UnexpectedValueException;
/**
* Crypto engine using OpenSSL extension.
*/
final class OpenSSLCrypto extends Crypto
{
/**
* Mapping from algorithm OID to OpenSSL signature method identifier.
*
* @internal
*
* @var array<string, int>
*/
private const MAP_DIGEST_OID = [
AlgorithmIdentifier::OID_MD4_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_MD4,
AlgorithmIdentifier::OID_MD5_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_MD5,
AlgorithmIdentifier::OID_SHA1_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_SHA1,
AlgorithmIdentifier::OID_SHA224_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_SHA224,
AlgorithmIdentifier::OID_SHA256_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_SHA256,
AlgorithmIdentifier::OID_SHA384_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_SHA384,
AlgorithmIdentifier::OID_SHA512_WITH_RSA_ENCRYPTION => OPENSSL_ALGO_SHA512,
AlgorithmIdentifier::OID_ECDSA_WITH_SHA1 => OPENSSL_ALGO_SHA1,
AlgorithmIdentifier::OID_ECDSA_WITH_SHA224 => OPENSSL_ALGO_SHA224,
AlgorithmIdentifier::OID_ECDSA_WITH_SHA256 => OPENSSL_ALGO_SHA256,
AlgorithmIdentifier::OID_ECDSA_WITH_SHA384 => OPENSSL_ALGO_SHA384,
AlgorithmIdentifier::OID_ECDSA_WITH_SHA512 => OPENSSL_ALGO_SHA512,
];
/**
* Mapping from algorithm OID to OpenSSL cipher method name.
*
* @internal
*
* @var array<string, string>
*/
private const MAP_CIPHER_OID = [
AlgorithmIdentifier::OID_DES_CBC => 'des-cbc',
AlgorithmIdentifier::OID_DES_EDE3_CBC => 'des-ede3-cbc',
AlgorithmIdentifier::OID_AES_128_CBC => 'aes-128-cbc',
AlgorithmIdentifier::OID_AES_192_CBC => 'aes-192-cbc',
AlgorithmIdentifier::OID_AES_256_CBC => 'aes-256-cbc',
];
public function sign(
string $data,
PrivateKeyInfo $privkey_info,
SignatureAlgorithmIdentifier $algo
): Signature {
$this->_checkSignatureAlgoAndKey($algo, $privkey_info->algorithmIdentifier());
$result = openssl_sign($data, $signature, (string) $privkey_info->toPEM(), $this->_algoToDigest($algo));
if ($result === false) {
throw new RuntimeException('openssl_sign() failed: ' . $this->_getLastError());
}
return Signature::fromSignatureData($signature, $algo);
}
public function verify(
string $data,
Signature $signature,
PublicKeyInfo $pubkey_info,
SignatureAlgorithmIdentifier $algo
): bool {
$this->_checkSignatureAlgoAndKey($algo, $pubkey_info->algorithmIdentifier());
$result = openssl_verify(
$data,
$signature->bitString()
->string(),
(string) $pubkey_info->toPEM(),
$this->_algoToDigest($algo)
);
if ($result === -1) {
throw new RuntimeException('openssl_verify() failed: ' . $this->_getLastError());
}
return $result === 1;
}
public function encrypt(string $data, string $key, CipherAlgorithmIdentifier $algo): string
{
$this->_checkCipherKeySize($algo, $key);
$iv = $algo->initializationVector();
$result = openssl_encrypt(
$data,
$this->_algoToCipher($algo),
$key,
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv
);
if ($result === false) {
throw new RuntimeException('openssl_encrypt() failed: ' . $this->_getLastError());
}
return $result;
}
public function decrypt(string $data, string $key, CipherAlgorithmIdentifier $algo): string
{
$this->_checkCipherKeySize($algo, $key);
$iv = $algo->initializationVector();
$result = openssl_decrypt(
$data,
$this->_algoToCipher($algo),
$key,
OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING,
$iv
);
if ($result === false) {
throw new RuntimeException('openssl_decrypt() failed: ' . $this->_getLastError());
}
return $result;
}
/**
* Validate cipher algorithm key size.
*/
protected function _checkCipherKeySize(CipherAlgorithmIdentifier $algo, string $key): void
{
if ($algo instanceof BlockCipherAlgorithmIdentifier) {
if (mb_strlen($key, '8bit') !== $algo->keySize()) {
throw new UnexpectedValueException(
sprintf(
'Key length for %s must be %d, %d given.',
$algo->name(),
$algo->keySize(),
mb_strlen($key, '8bit')
)
);
}
}
}
/**
* Get last OpenSSL error message.
*/
protected function _getLastError(): ?string
{
// pump error message queue
$msg = null;
while (false !== ($err = openssl_error_string())) {
$msg = $err;
}
return $msg;
}
/**
* Check that given signature algorithm supports key of given type.
*
* @param SignatureAlgorithmIdentifier $sig_algo Signature algorithm
* @param AlgorithmIdentifier $key_algo Key algorithm
*/
protected function _checkSignatureAlgoAndKey(
SignatureAlgorithmIdentifier $sig_algo,
AlgorithmIdentifier $key_algo
): void {
if (! $sig_algo->supportsKeyAlgorithm($key_algo)) {
throw new UnexpectedValueException(
sprintf(
'Signature algorithm %s does not support key algorithm %s.',
$sig_algo->name(),
$key_algo->name()
)
);
}
}
/**
* Get OpenSSL digest method for given signature algorithm identifier.
*/
protected function _algoToDigest(SignatureAlgorithmIdentifier $algo): int
{
$oid = $algo->oid();
if (! array_key_exists($oid, self::MAP_DIGEST_OID)) {
throw new UnexpectedValueException(sprintf('Digest method %s not supported.', $algo->name()));
}
return self::MAP_DIGEST_OID[$oid];
}
/**
* Get OpenSSL cipher method for given cipher algorithm identifier.
*/
protected function _algoToCipher(CipherAlgorithmIdentifier $algo): string
{
$oid = $algo->oid();
if (array_key_exists($oid, self::MAP_CIPHER_OID)) {
return self::MAP_CIPHER_OID[$oid];
}
if ($oid === AlgorithmIdentifier::OID_RC2_CBC) {
if (! $algo instanceof RC2CBCAlgorithmIdentifier) {
throw new UnexpectedValueException('Not an RC2-CBC algorithm.');
}
return $this->_rc2AlgoToCipher($algo);
}
throw new UnexpectedValueException(sprintf('Cipher method %s not supported.', $algo->name()));
}
/**
* Get OpenSSL cipher method for given RC2 algorithm identifier.
*/
protected function _rc2AlgoToCipher(RC2CBCAlgorithmIdentifier $algo): string
{
return match ($algo->effectiveKeyBits()) {
128 => 'rc2-cbc',
64 => 'rc2-64-cbc',
40 => 'rc2-40-cbc',
default => throw new UnexpectedValueException($algo->effectiveKeyBits() . ' bit RC2 not supported.'),
};
}
}