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Merge pull request #757 from bantu/ssh2-function-key_exchange-reduction-2.0

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[2.0] Add _encryption_algorithm_to_crypt_instance method.

* bantu/ssh2-function-key_exchange-reduction-2.0:
  [2.0] Add _encryption_algorithm_to_crypt_instance method.
This commit is contained in:
Andreas Fischer 2015-07-29 01:09:20 +02:00
commit 772d4df597
1 changed files with 52 additions and 100 deletions
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152
phpseclib/Net/SSH2.php
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@ -1605,112 +1605,16 @@ class SSH2
return false; return false;
} }
switch ($encrypt) {
case '3des-cbc':
$this->encrypt = new TripleDES();
// $this->encrypt_block_size = 64 / 8 == the default
break;
case '3des-ctr':
$this->encrypt = new TripleDES(Base::MODE_CTR);
// $this->encrypt_block_size = 64 / 8 == the default
break;
case 'aes256-cbc':
case 'aes192-cbc':
case 'aes128-cbc':
$this->encrypt = new Rijndael();
$this->encrypt_block_size = 16; // eg. 128 / 8
break;
case 'aes256-ctr':
case 'aes192-ctr':
case 'aes128-ctr':
$this->encrypt = new Rijndael(Base::MODE_CTR);
$this->encrypt_block_size = 16; // eg. 128 / 8
break;
case 'blowfish-cbc':
$this->encrypt = new Blowfish();
$this->encrypt_block_size = 8;
break;
case 'blowfish-ctr':
$this->encrypt = new Blowfish(Base::MODE_CTR);
$this->encrypt_block_size = 8;
break;
case 'twofish128-cbc':
case 'twofish192-cbc':
case 'twofish256-cbc':
case 'twofish-cbc':
$this->encrypt = new Twofish();
$this->encrypt_block_size = 16;
break;
case 'twofish128-ctr':
case 'twofish192-ctr':
case 'twofish256-ctr':
$this->encrypt = new Twofish(Base::MODE_CTR);
$this->encrypt_block_size = 16;
break;
case 'arcfour':
case 'arcfour128':
case 'arcfour256':
$this->encrypt = new RC4();
break;
case 'none':
//$this->encrypt = new Null();
}
switch ($decrypt) {
case '3des-cbc':
$this->decrypt = new TripleDES();
break;
case '3des-ctr':
$this->decrypt = new TripleDES(Base::MODE_CTR);
break;
case 'aes256-cbc':
case 'aes192-cbc':
case 'aes128-cbc':
$this->decrypt = new Rijndael();
$this->decrypt_block_size = 16;
break;
case 'aes256-ctr':
case 'aes192-ctr':
case 'aes128-ctr':
$this->decrypt = new Rijndael(Base::MODE_CTR);
$this->decrypt_block_size = 16;
break;
case 'blowfish-cbc':
$this->decrypt = new Blowfish();
$this->decrypt_block_size = 8;
break;
case 'blowfish-ctr':
$this->decrypt = new Blowfish(Base::MODE_CTR);
$this->decrypt_block_size = 8;
break;
case 'twofish128-cbc':
case 'twofish192-cbc':
case 'twofish256-cbc':
case 'twofish-cbc':
$this->decrypt = new Twofish();
$this->decrypt_block_size = 16;
break;
case 'twofish128-ctr':
case 'twofish192-ctr':
case 'twofish256-ctr':
$this->decrypt = new Twofish(Base::MODE_CTR);
$this->decrypt_block_size = 16;
break;
case 'arcfour':
case 'arcfour128':
case 'arcfour256':
$this->decrypt = new RC4();
break;
case 'none':
//$this->decrypt = new Null();
}
$keyBytes = pack('Na*', strlen($keyBytes), $keyBytes); $keyBytes = pack('Na*', strlen($keyBytes), $keyBytes);
$this->encrypt = $this->_encryption_algorithm_to_crypt_instance($encrypt);
if ($this->encrypt) { if ($this->encrypt) {
if ($this->crypto_engine) { if ($this->crypto_engine) {
$this->encrypt->setEngine($this->crypto_engine); $this->encrypt->setEngine($this->crypto_engine);
} }
if ($this->encrypt->block_size) {
$this->encrypt_block_size = $this->encrypt->block_size;
}
$this->encrypt->enableContinuousBuffer(); $this->encrypt->enableContinuousBuffer();
$this->encrypt->disablePadding(); $this->encrypt->disablePadding();
@ -1727,10 +1631,14 @@ class SSH2
$this->encrypt->setKey(substr($key, 0, $encryptKeyLength)); $this->encrypt->setKey(substr($key, 0, $encryptKeyLength));
} }
$this->decrypt = $this->_encryption_algorithm_to_crypt_instance($decrypt);
if ($this->decrypt) { if ($this->decrypt) {
if ($this->crypto_engine) { if ($this->crypto_engine) {
$this->decrypt->setEngine($this->crypto_engine); $this->decrypt->setEngine($this->crypto_engine);
} }
if ($this->decrypt->block_size) {
$this->decrypt_block_size = $this->decrypt->block_size;
}
$this->decrypt->enableContinuousBuffer(); $this->decrypt->enableContinuousBuffer();
$this->decrypt->disablePadding(); $this->decrypt->disablePadding();
@ -1893,6 +1801,50 @@ class SSH2
return null; return null;
} }
/**
* Maps an encryption algorithm name to an instance of a subclass of
* \phpseclib\Crypt\Base.
*
* @param String $algorithm Name of the encryption algorithm
* @return Mixed Instance of \phpseclib\Crypt\Base or null for unknown
* @access private
*/
function _encryption_algorithm_to_crypt_instance($algorithm)
{
switch ($algorithm) {
case '3des-cbc':
return new TripleDES();
case '3des-ctr':
return new TripleDES(Base::MODE_CTR);
case 'aes256-cbc':
case 'aes192-cbc':
case 'aes128-cbc':
return new Rijndael();
case 'aes256-ctr':
case 'aes192-ctr':
case 'aes128-ctr':
return new Rijndael(Base::MODE_CTR);
case 'blowfish-cbc':
return new Blowfish();
case 'blowfish-ctr':
return new Blowfish(Base::MODE_CTR);
case 'twofish128-cbc':
case 'twofish192-cbc':
case 'twofish256-cbc':
case 'twofish-cbc':
return new Twofish();
case 'twofish128-ctr':
case 'twofish192-ctr':
case 'twofish256-ctr':
return new Twofish(Base::MODE_CTR);
case 'arcfour':
case 'arcfour128':
case 'arcfour256':
return new RC4();
}
return null;
}
/** /**
* Login * Login
* *