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better random string

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Stephen Paul Weber 2013-01-26 17:14:38 -05:00
parent cb9f918022
commit 2a331f7403
1 changed files with 3 additions and 12 deletions
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15
lib/openpgp_crypt_aes_tripledes.php
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@ -9,10 +9,10 @@ require_once 'Crypt/Random.php';
class OpenPGP_Crypt_AES_TripleDES {
public static function encrypt($passphrases_and_keys, $message, $symmetric_algorithm=9) {
list($cipher, $key_bytes, $key_block_bytes) = self::getCipher($symmetric_algorithm);
$prefix = self::randomBytes($key_block_bytes);
$prefix = crypt_random_string($key_block_bytes);
$prefix .= substr($prefix, -2);
$key = self::randomBytes($key_bytes);
$key = crypt_random_string($key_bytes);
$cipher->setKey($key);
$to_encrypt = $prefix . $message->to_bytes();
@ -34,7 +34,7 @@ class OpenPGP_Crypt_AES_TripleDES {
$esk = pack('n', OpenPGP::bitlength($esk)) . $esk;
array_unshift($encrypted, new OpenPGP_AsymmetricSessionKeyPacket($pass->algorithm, $pass->fingerprint(), $esk));
} else if(is_string($pass)) {
$s2k = new OpenPGP_S2K(crypt_random() . crypt_random() . crypt_random());
$s2k = new OpenPGP_S2K(crypt_random_string(10));
$cipher->setKey($s2k->make_key($pass, $key_bytes));
$esk = $cipher->encrypt(chr($symmetric_algorithm) . $key);
array_unshift($encrypted, new OpenPGP_SymmetricSessionKeyPacket($s2k, $esk, $symmetric_algorithm));
@ -176,15 +176,6 @@ class OpenPGP_Crypt_AES_TripleDES {
throw new Exception("Can only decrypt EncryptedDataPacket");
}
public static function randomBytes($n) {
$key = '';
for($i = 0; $i < $n; $i++) {
$key .= crypt_random();
}
$s2k = new OpenPGP_S2K(crypt_random() . crypt_random() . crypt_random());
return $s2k->make_key($key, $n);
}
public static function checksum($s) {
$mkChk = 0;
for($i = 0; $i < strlen($s); $i++) {