本文整理匯總了PHP中TCPDF_STATIC::_md5_16方法的典型用法代碼示例。如果您正苦於以下問題：PHP TCPDF_STATIC::_md5_16方法的具體用法？PHP TCPDF_STATIC::_md5_16怎麽用？PHP TCPDF_STATIC::_md5_16使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類TCPDF_STATIC的用法示例。
在下文中一共展示了TCPDF_STATIC::_md5_16方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的PHP代碼示例。
示例1: _generateencryptionkey
/**
* Compute encryption key
* @protected
* @since 2.0.000 (2008-01-02)
* @author Nicola Asuni
*/
protected function _generateencryptionkey()
{
$keybytelen = $this->encryptdata['Length'] / 8;
if (!$this->encryptdata['pubkey']) {
// standard mode
if ($this->encryptdata['mode'] == 3) {
// AES-256
// generate 256 bit random key
$this->encryptdata['key'] = substr(hash('sha256', TCPDF_STATIC::getRandomSeed(), true), 0, $keybytelen);
// truncate passwords
$this->encryptdata['user_password'] = $this->_fixAES256Password($this->encryptdata['user_password']);
$this->encryptdata['owner_password'] = $this->_fixAES256Password($this->encryptdata['owner_password']);
// Compute U value
$this->encryptdata['U'] = $this->_Uvalue();
// Compute UE value
$this->encryptdata['UE'] = $this->_UEvalue();
// Compute O value
$this->encryptdata['O'] = $this->_Ovalue();
// Compute OE value
$this->encryptdata['OE'] = $this->_OEvalue();
// Compute P value
$this->encryptdata['P'] = $this->encryptdata['protection'];
// Computing the encryption dictionary's Perms (permissions) value
$perms = TCPDF_STATIC::getEncPermissionsString($this->encryptdata['protection']);
// bytes 0-3
$perms .= chr(255) . chr(255) . chr(255) . chr(255);
// bytes 4-7
if (isset($this->encryptdata['CF']['EncryptMetadata']) and !$this->encryptdata['CF']['EncryptMetadata']) {
// byte 8
$perms .= 'F';
} else {
$perms .= 'T';
}
$perms .= 'adb';
// bytes 9-11
$perms .= 'nick';
// bytes 12-15
$iv = str_repeat("", mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB));
$this->encryptdata['perms'] = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $this->encryptdata['key'], $perms, MCRYPT_MODE_ECB, $iv);
} else {
// RC4-40, RC4-128, AES-128
// Pad passwords
$this->encryptdata['user_password'] = substr($this->encryptdata['user_password'] . TCPDF_STATIC::$enc_padding, 0, 32);
$this->encryptdata['owner_password'] = substr($this->encryptdata['owner_password'] . TCPDF_STATIC::$enc_padding, 0, 32);
// Compute O value
$this->encryptdata['O'] = $this->_Ovalue();
// get default permissions (reverse byte order)
$permissions = TCPDF_STATIC::getEncPermissionsString($this->encryptdata['protection']);
// Compute encryption key
$tmp = TCPDF_STATIC::_md5_16($this->encryptdata['user_password'] . $this->encryptdata['O'] . $permissions . $this->encryptdata['fileid']);
if ($this->encryptdata['mode'] > 0) {
for ($i = 0; $i < 50; ++$i) {
$tmp = TCPDF_STATIC::_md5_16(substr($tmp, 0, $keybytelen));
}
}
$this->encryptdata['key'] = substr($tmp, 0, $keybytelen);
// Compute U value
$this->encryptdata['U'] = $this->_Uvalue();
// Compute P value
$this->encryptdata['P'] = $this->encryptdata['protection'];
}
} else {
// Public-Key mode
// random 20-byte seed
$seed = sha1(TCPDF_STATIC::getRandomSeed(), true);
$recipient_bytes = '';
foreach ($this->encryptdata['pubkeys'] as $pubkey) {
// for each public certificate
if (isset($pubkey['p'])) {
$pkprotection = TCPDF_STATIC::getUserPermissionCode($pubkey['p'], $this->encryptdata['mode']);
} else {
$pkprotection = $this->encryptdata['protection'];
}
// get default permissions (reverse byte order)
$pkpermissions = TCPDF_STATIC::getEncPermissionsString($pkprotection);
// envelope data
$envelope = $seed . $pkpermissions;
// write the envelope data to a temporary file
$tempkeyfile = TCPDF_STATIC::getObjFilename('tmpkey');
$f = fopen($tempkeyfile, 'wb');
if (!$f) {
$this->Error('Unable to create temporary key file: ' . $tempkeyfile);
}
$envelope_length = strlen($envelope);
fwrite($f, $envelope, $envelope_length);
fclose($f);
$tempencfile = TCPDF_STATIC::getObjFilename('tmpenc');
if (!openssl_pkcs7_encrypt($tempkeyfile, $tempencfile, $pubkey['c'], array(), PKCS7_BINARY | PKCS7_DETACHED)) {
$this->Error('Unable to encrypt the file: ' . $tempkeyfile);
}
unlink($tempkeyfile);
// read encryption signature
$signature = file_get_contents($tempencfile, false, null, $envelope_length);
unlink($tempencfile);
//.........這裏部分代碼省略.........