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PhabricatorHash.php
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Created
Fri, Mar 28, 20:09

PhabricatorHash.php
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<?php
final class PhabricatorHash {
/**
* Digest a string for general use, including use which relates to security.
*
* @param string Input string.
* @return string 32-byte hexidecimal SHA1+HMAC hash.
*/
public static function digest($string, $key = null) {
if ($key === null) {
$key = PhabricatorEnv::getEnvConfig('security.hmac-key');
}
if (!$key) {
throw new Exception(
"Set a 'security.hmac-key' in your Phabricator configuration!");
}
return hash_hmac('sha1', $string, $key);
}
/**
* Digest a string into a password hash. This is similar to @{method:digest},
* but requires a salt and iterates the hash to increase cost.
*/
public static function digestPassword(PhutilOpaqueEnvelope $envelope, $salt) {
$result = $envelope->openEnvelope();
if (!$result) {
throw new Exception('Trying to digest empty password!');
}
for ($ii = 0; $ii < 1000; $ii++) {
$result = PhabricatorHash::digest($result, $salt);
}
return $result;
}
/**
* Digest a string for use in, e.g., a MySQL index. This produces a short
* (12-byte), case-sensitive alphanumeric string with 72 bits of entropy,
* which is generally safe in most contexts (notably, URLs).
*
* This method emphasizes compactness, and should not be used for security
* related hashing (for general purpose hashing, see @{method:digest}).
*
* @param string Input string.
* @return string 12-byte, case-sensitive alphanumeric hash of the string
* which
*/
public static function digestForIndex($string) {
$hash = sha1($string, $raw_output = true);
static $map;
if ($map === null) {
$map = '0123456789'.
'abcdefghij'.
'klmnopqrst'.
'uvwxyzABCD'.
'EFGHIJKLMN'.
'OPQRSTUVWX'.
'YZ._';
}
$result = '';
for ($ii = 0; $ii < 12; $ii++) {
$result .= $map[(ord($hash[$ii]) & 0x3F)];
}
return $result;
}
}

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