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Merge branch '2.0'

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This commit is contained in:
terrafrost 2018-10-12 22:44:14 -05:00
commit a1513eb02f
1 changed files with 32 additions and 13 deletions
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45
phpseclib/Crypt/Hash.php
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@ -153,6 +153,31 @@ class Hash
public function setKey($key = false)
{
$this->key = $key;
$this->computeKey();
}
/**
* Pre-compute the key used by the HMAC
*
* Quoting http://tools.ietf.org/html/rfc2104#section-2, "Applications that use keys longer than B bytes
* will first hash the key using H and then use the resultant L byte string as the actual key to HMAC."
*
* As documented in https://www.reddit.com/r/PHP/comments/9nct2l/symfonypolyfill_hash_pbkdf2_correct_fix_for/
* when doing an HMAC multiple times it's faster to compute the hash once instead of computing it during
* every call
*
* @access private
*/
private function computeKey()
{
if (strlen($this->key) <= $this->getBlockLengthInBytes()) {
$this->computedKey = $this->key;
return;
}
$this->computedKey = is_array($this->hash) ?
call_user_func($this->hash, $this->key) :
hash($this->hash, $this->key, true);
}
/**
@ -228,12 +253,14 @@ class Hash
}
switch ($hash) {
case 'md2':
case 'md2-96':
$this->blockSize = 128;
break;
case 'md5-96':
case 'sha1-96':
case 'sha224-96':
case 'sha256-96':
case 'md2':
case 'md5':
case 'sha1':
case 'sha224':
@ -308,6 +335,8 @@ class Hash
}
$this->hash = $hash;
$this->computeKey();
}
/**
@ -326,17 +355,7 @@ class Hash
// SHA3 HMACs are discussed at https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=30
/* "Applications that use keys longer than B bytes will first hash the key using H and then use the
resultant L byte string as the actual key to HMAC."
$b = $this->blockSize >> 3;
-- http://tools.ietf.org/html/rfc2104#section-2 */
$key = strlen($this->key) > $b ?
substr(call_user_func($this->hash, $this->key, ...array_values($this->parameters)), 0, $this->length) :
$this->key;
$key = str_pad($key, $b, chr(0));
$key = str_pad($this->computedKey, $b, chr(0));
$temp = $this->ipad ^ $key;
$temp .= $text;
$temp = substr(call_user_func($this->hash, $temp, ...array_values($this->parameters)), 0, $this->length);
@ -348,7 +367,7 @@ class Hash
}
$output = !empty($this->key) || is_string($this->key) ?
hash_hmac($this->hash, $text, $this->key, true) :
hash_hmac($this->hash, $text, $this->computedKey, true) :
hash($this->hash, $text, true);
return strlen($output) > $this->length