/**
* Compute a public key identifier.
*
* Although key identifiers may be set to any unique value, this function
* computes key identifiers from public key according to the two
* recommended methods (4.2.1.2 RFC 3280).
* Highly polymorphic: try to accept all possible forms of key:
* - Key object
* - \phpseclib\File\X509 object with public or private key defined
* - Certificate or CSR array
* - \phpseclib\File\ASN1\Element object
* - PEM or DER string
*
* @param mixed $key optional
* @param int $method optional
* @access public
* @return string binary key identifier
*/
function computeKeyIdentifier($key = null, $method = 1)
{
if (is_null($key)) {
$key = $this;
}
switch (true) {
case is_string($key):
break;
case is_array($key) && isset($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey']):
return $this->computeKeyIdentifier($key['tbsCertificate']['subjectPublicKeyInfo']['subjectPublicKey'], $method);
case is_array($key) && isset($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey']):
return $this->computeKeyIdentifier($key['certificationRequestInfo']['subjectPKInfo']['subjectPublicKey'], $method);
case !is_object($key):
return false;
case $key instanceof Element:
// Assume the element is a bitstring-packed key.
$asn1 = new ASN1();
$decoded = $asn1->decodeBER($key->element);
if (empty($decoded)) {
return false;
}
$raw = $asn1->asn1map($decoded[0], array('type' => ASN1::TYPE_BIT_STRING));
if (empty($raw)) {
return false;
}
$raw = base64_decode($raw);
// If the key is private, compute identifier from its corresponding public key.
$key = new RSA();
if (!$key->loadKey($raw)) {
return false; // Not an unencrypted RSA key.
}
if ($key->getPrivateKey() !== false) { // If private.
return $this->computeKeyIdentifier($key, $method);
}
$key = $raw; // Is a public key.
break;
case $key instanceof X509:
if (isset($key->publicKey)) {
return $this->computeKeyIdentifier($key->publicKey, $method);
}
if (isset($key->privateKey)) {
return $this->computeKeyIdentifier($key->privateKey, $method);
}
if (isset($key->currentCert['tbsCertificate']) || isset($key->currentCert['certificationRequestInfo'])) {
return $this->computeKeyIdentifier($key->currentCert, $method);
}
return false;
default: // Should be a key object (i.e.: \phpseclib\Crypt\RSA).
$key = $key->getPublicKey(RSA::PUBLIC_FORMAT_PKCS1);
break;
}
// If in PEM format, convert to binary.
$key = $this->_extractBER($key);
// Now we have the key string: compute its sha-1 sum.
$hash = new Hash('sha1');
$hash = $hash->hash($key);
if ($method == 2) {
$hash = substr($hash, -8);
$hash[0] = chr((ord($hash[0]) & 0x0F) | 0x40);
}
return $hash;
}
public function testSSHPubKey()
{
$rsa = new RSA();
$key = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4e' . 'CZ0FPqri0cb2JZfXJ/DgYSF6vUpwmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMS' . 'GkVb1/3j+skZ6UtW+5u09lHNsj6tQ51s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZw== ' . 'phpseclib-generated-key';
$this->assertTrue($rsa->loadKey($key));
$this->assertInternalType('string', $rsa->getPublicKey());
$this->assertFalse($rsa->getPrivateKey());
}
