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(#1423) make PSS verification work for non power of 2 keys

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RFC3447 doesn't require RSA public keys to be power of 2 keys.
The actual validation code doesn't work when trying to verify
a PSS signature generated with a non power of two key.
This small patch adds support for such keys.
This commit is contained in:
Brice Figureau 2019-10-19 15:30:39 +02:00 committed by terrafrost
parent a34a4edac5
commit 207cd0f4ea
2 changed files with 24 additions and 3 deletions
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6
phpseclib/Crypt/RSA.php
View File

@ -2846,7 +2846,7 @@ class Crypt_RSA
// if $m is larger than two million terrabytes and you're using sha1, PKCS#1 suggests a "Label too long" error
// be output.
$emLen = ($emBits + 1) >> 3; // ie. ceil($emBits / 8);
$emLen = ($emBits + 7) >> 3; // ie. ceil($emBits / 8);
$sLen = $this->sLen !== null ? $this->sLen : $this->hLen;
$mHash = $this->hash->hash($m);
@ -2924,7 +2924,7 @@ class Crypt_RSA
// RSA verification
$modBits = 8 * $this->k;
$modBits = strlen($this->modulus->toBits());
$s2 = $this->_os2ip($s);
$m2 = $this->_rsavp1($s2);
@ -2932,7 +2932,7 @@ class Crypt_RSA
user_error('Invalid signature');
return false;
}
$em = $this->_i2osp($m2, $modBits >> 3);
$em = $this->_i2osp($m2, $this->k);
if ($em === false) {
user_error('Invalid signature');
return false;

21
tests/Unit/Crypt/RSA/ModeTest.php
View File

@ -94,4 +94,25 @@ U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
$rsa->loadKey($rsa->getPublicKey());
$this->assertTrue($rsa->verify($plaintext, $sig));
}
/**
* @group github1423
*/
public function testPSSSigsWithNonPowerOf2Key()
{
$pub = '-----BEGIN PUBLIC KEY-----
MF0wDQYJKoZIhvcNAQEBBQADTAAwSQJCAmdYuOvii3I6ya3q/zSeZFoJprgF9fIq
k12yS6pCS3c+1wZ9cYFVtgfpSL4XpylLe9EnRT2GRVYCqUkR4AUeTuvnAgMBAAE=
-----END PUBLIC KEY-----';
$rsa = new Crypt_RSA();
$rsa->loadKey($pub);
$rsa->setHash('sha256');
$rsa->setSaltLength(32);
$rsa->setMGFHash('sha256');
$sig = base64_decode(strtr('Ad022bD-UCmWpBNMtsYJjG0FVxML-FFlN4IKrByP8rwjVzV_D-YqSjc_oW6LrooV7jbtEF5803YLn8lllyzDnw00', '-_', '+/'));
$payload = 'eyJraWQiOiJ0RkMyVUloRnBUTV9FYTNxY09kX01xUVQxY0JCbTlrRkxTRGZlSmhzUkc4IiwiYWxnIjoiUFMyNTYifQ.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';
$this->assertTrue($rsa->verify($payload, $sig));
}
}