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RSA: backport getPublicKeyFingerprint from Lukas-W's PR

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This commit is contained in:
terrafrost 2015-05-06 22:55:12 -05:00
parent 5bd7a73a71
commit f19bf7a07d
2 changed files with 51 additions and 0 deletions
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36
phpseclib/Crypt/RSA.php
View File

@ -1772,6 +1772,42 @@ class Crypt_RSA
return $temp;
}
/**
* Returns the public key's fingerprint
*
* The public key's fingerprint is returned, which is equivalent to running `ssh-keygen -lf rsa.pub`. If there is
* no public key currently loaded, false is returned.
* Example output (md5): "c1:b1:30:29:d7:b8:de:6c:97:77:10:d7:46:41:63:87" (as specified by RFC 4716)
*
* @access public
* @param String $algorithm The hashing algorithm to be used. Valid options are 'md5' and 'sha256'. False is returned
* for invalid values.
*/
public function getPublicKeyFingerprint($algorithm = 'md5')
{
if (empty($this->modulus) || empty($this->publicExponent)) {
return false;
}
$modulus = $this->modulus->toBytes(true);
$publicExponent = $this->publicExponent->toBytes(true);
$RSAPublicKey = pack('Na*Na*Na*', strlen('ssh-rsa'), 'ssh-rsa', strlen($publicExponent), $publicExponent, strlen($modulus), $modulus);
switch($algorithm)
{
case 'sha256':
$hash = new Crypt_Hash('sha256');
$base = base64_encode($hash->hash($RSAPublicKey));
return substr($base, 0, strlen($base) - 1);
case 'md5':
return substr(chunk_split(md5($RSAPublicKey), 2, ':'), 0, -1);
default:
return false;
}
}
/**
* Returns the private key
*

15
tests/Unit/Crypt/RSA/LoadKeyTest.php
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@ -241,6 +241,21 @@ ZQIDAQAB
$this->assertFalse($rsa->getPrivateKey());
}
public function testSSHPubKeyFingerprint()
{
$rsa = new Crypt_RSA();
$key = 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQD9K+ebJRMN10kGanhi6kDz6EYFqZttZWZh0'.
'YoEbIbbere9N2Yvfc7oIoCTHYowhXND9WSJaIs1E4bx0085CZnofWaqf4NbZTzAh18iZup08ec'.
'COB5gJVS1efpgVSviDF2L7jxMsBVoOBfqsmA8m0RwDDVezyWvw4y+STSuVzu2jI8EfwN7ZFGC6'.
'Yo8m/Z94qIGzqPYGKJLuCeidB0TnUE0ZtzOJTiOc/WoTm/NOpCdfQZEJggd1MOTi+QUnqRu4Wu'.
'b6wYtY/q/WtUFr3nK+x0lgOtokhnJfRR/6fnmC1CztPnIT4BWK81VGKWONAxuhMyQ5XChyu6S9'.
'mWG5tUlUI/5';
$this->assertTrue($rsa->loadKey($key));
$this->assertSame($rsa->getPublicKeyFingerprint('md5'), 'bd:2c:2f:31:b9:ef:b8:f8:ad:fc:40:a6:94:4f:28:82');
$this->assertSame($rsa->getPublicKeyFingerprint('sha256'), 'N9sV2uSNZEe8TITODku0pRI27l+Zk0IY0TrRTw3ozwM');
}
public function testSetPrivate()
{
$rsa = new Crypt_RSA();