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PKCS8: add extractEncryptionAlgorithm() method

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This commit is contained in:
terrafrost 2020-04-17 09:06:48 -05:00
parent 0f8486cc87
commit 92d0cd837e
1 changed files with 62 additions and 19 deletions
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81
phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
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@ -332,25 +332,7 @@ abstract class PKCS8 extends PKCS
*/
protected static function load($key, $password = '')
{
self::initialize_static_variables();
if (!Strings::is_stringable($key)) {
throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
}
if (self::$format != self::MODE_DER) {
$decoded = ASN1::extractBER($key);
if ($decoded !== false) {
$key = $decoded;
} elseif (self::$format == self::MODE_PEM) {
throw new \UnexpectedValueException('Expected base64-encoded PEM format but was unable to decode base64 text');
}
}
$decoded = ASN1::decodeBER($key);
if (empty($decoded)) {
throw new \RuntimeException('Unable to decode BER');
}
$decoded = self::preParse($key);
$meta = [];
@ -655,4 +637,65 @@ abstract class PKCS8 extends PKCS
chunk_split(Base64::encode($key), 64) .
"-----END PUBLIC KEY-----";
}
/**
* Perform some preliminary parsing of the key
*
* @param string $key
* @return array
*/
private static function preParse(&$key)
{
self::initialize_static_variables();
if (!Strings::is_stringable($key)) {
throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
}
if (self::$format != self::MODE_DER) {
$decoded = ASN1::extractBER($key);
if ($decoded !== false) {
$key = $decoded;
} elseif (self::$format == self::MODE_PEM) {
throw new \UnexpectedValueException('Expected base64-encoded PEM format but was unable to decode base64 text');
}
}
$decoded = ASN1::decodeBER($key);
if (empty($decoded)) {
throw new \RuntimeException('Unable to decode BER');
}
return $decoded;
}
/**
* Returns the encryption parameters used by the key
*
* @param string $key
* @return array
*/
public static function extractEncryptionAlgorithm($key)
{
$decoded = self::preParse($key);
$r = ASN1::asn1map($decoded[0], ASN1\Maps\EncryptedPrivateKeyInfo::MAP);
if (!is_array($r)) {
throw new \RuntimeException('Unable to parse using EncryptedPrivateKeyInfo map');
}
if ($r['encryptionAlgorithm']['algorithm'] == 'id-PBES2') {
$decoded = ASN1::decodeBER($r['encryptionAlgorithm']['parameters']->element);
$r['encryptionAlgorithm']['parameters'] = ASN1::asn1map($decoded[0], ASN1\Maps\PBES2params::MAP);
$kdf = &$r['encryptionAlgorithm']['parameters']['keyDerivationFunc'];
switch ($kdf['algorithm']) {
case 'id-PBKDF2':
$decoded = ASN1::decodeBER($kdf['parameters']->element);
$kdf['parameters'] = ASN1::asn1map($decoded[0], Maps\PBKDF2params::MAP);
}
}
return $r['encryptionAlgorithm'];
}
}