我有一个RSA公钥/私钥xml文件。我想用它来签名一些数据,下面是类,这是我使用类的方式:
$processor = new RSAProcessor("certificate.xml", RSAKeyType:: XMLFile);
$data = $processor->sign($data);
print(base64_encode($data));
但是出现错误:WARNING: str_repeat(): Second argument has to be greater than or equal to 0 in RSA.php on line 81
。如何解决?我想某些东西已经过时的PHP 7.2?感谢您的帮助,我应该在课堂上做些什么更改以避免这种错误?
Rsa类:
define("BCCOMP_LARGER", 1);
class RSA {
static function rsa_encrypt($message, $public_key, $modulus, $keylength) {
$padded = RSA::add_PKCS1_padding($message, true, $keylength / 8);
$number = RSA::binary_to_number($padded);
$encrypted = RSA::pow_mod($number, $public_key, $modulus);
$result = RSA::number_to_binary($encrypted, $keylength / 8);
return $result;
}
static function rsa_decrypt($message, $private_key, $modulus, $keylength) {
$number = RSA::binary_to_number($message);
$decrypted = RSA::pow_mod($number, $private_key, $modulus);
$result = RSA::number_to_binary($decrypted, $keylength / 8);
return RSA::remove_PKCS1_padding($result, $keylength / 8);
}
static function rsa_sign($message, $private_key, $modulus, $keylength) {
$padded = RSA::add_PKCS1_padding($message, false, $keylength / 8);
$number = RSA::binary_to_number($padded);
$signed = RSA::pow_mod($number, $private_key, $modulus);
$result = RSA::number_to_binary($signed, $keylength / 8);
return $result;
}
static function rsa_verify($message, $public_key, $modulus, $keylength) {
return RSA::rsa_decrypt($message, $public_key, $modulus, $keylength);
}
static function rsa_kyp_verify($message, $public_key, $modulus, $keylength) {
$number = RSA::binary_to_number($message);
$decrypted = RSA::pow_mod($number, $public_key, $modulus);
$result = RSA::number_to_binary($decrypted, $keylength / 8);
return RSA::remove_KYP_padding($result, $keylength / 8);
}
static function pow_mod($p, $q, $r) {
$factors = array();
$div = $q;
$power_of_two = 0;
while(bccomp($div, "0") == BCCOMP_LARGER) {
$rem = bcmod($div, 2);
$div = bcdiv($div, 2);
if($rem) array_push($factors, $power_of_two);
$power_of_two++;
}
$partial_results = array();
$part_res = $p;
$idx = 0;
foreach($factors as $factor) {
while($idx < $factor)
{
$part_res = bcpow($part_res, "2");
$part_res = bcmod($part_res, $r);
$idx++;
}
array_push($partial_results, $part_res);
}
$result = "1";
foreach($partial_results as $part_res)
{
$result = bcmul($result, $part_res);
$result = bcmod($result, $r);
}
return $result;
}
static function add_PKCS1_padding($data, $isPublicKey, $blocksize)
{
$pad_length = $blocksize - 3 - strlen($data);
if($isPublicKey)
{
$block_type = "\x02";
$padding = "";
for($i = 0; $i < $pad_length; $i++)
{
$rnd = mt_rand(1, 255);
$padding .= chr($rnd);
}
}
else
{
$block_type = "\x01";
$padding = str_repeat("\xFF", $pad_length);
}
return "\x00" . $block_type . $padding . "\x00" . $data;
}
static function remove_PKCS1_padding($data, $blocksize)
{
assert(strlen($data) == $blocksize);
$data = substr($data, 1);
if($data{0} == '\0')
die("Block type 0 not implemented.");
assert(($data{0} == "\x01") || ($data{0} == "\x02"));
$offset = strpos($data, "\0", 1);
return substr($data, $offset + 1);
}
static function remove_KYP_padding($data, $blocksize)
{
assert(strlen($data) == $blocksize);
$offset = strpos($data, "\0");
return substr($data, 0, $offset);
}
static function binary_to_number($data)
{
$base = "256";
$radix = "1";
$result = "0";
for($i = strlen($data) - 1; $i >= 0; $i--)
{
$digit = ord($data{$i});
$part_res = bcmul($digit, $radix);
$result = bcadd($result, $part_res);
$radix = bcmul($radix, $base);
}
return $result;
}
static function number_to_binary($number, $blocksize)
{
$base = "256";
$result = "";
$div = $number;
while($div > 0)
{
$mod = bcmod($div, $base);
$div = bcdiv($div, $base);
$result = chr($mod) . $result;
}
return str_pad($result, $blocksize, "\x00", STR_PAD_LEFT);
}
}
RSAProcessor类:
class RSAProcessor
{
private $public_key = null;
private $private_key = null;
private $modulus = null;
private $key_length = "1024";
public function __construct($xmlRsakey=null,$type=null)
{
$xmlObj = null;
if ($xmlRsakey==null) {
$xmlObj = simplexml_load_file("xmlfile/RSAKey.xml");
} elseif ($type==RSAKeyType::XMLFile) {
$xmlObj = simplexml_load_file($xmlRsakey);
} else {
$xmlObj = simplexml_load_string($xmlRsakey);
}
$this->modulus = RSA::binary_to_number(base64_decode($xmlObj->Modulus));
$this->public_key = RSA::binary_to_number(base64_decode($xmlObj->Exponent));
$this->private_key = RSA::binary_to_number(base64_decode($xmlObj->D));
$this->key_length = strlen(base64_decode($xmlObj->Modulus))*8;
}
public function getPublicKey() {
return $this->public_key;
}
public function getPrivateKey() {
return $this->private_key;
}
public function getKeyLength() {
return $this->key_length;
}
public function getModulus() {
return $this->modulus;
}
public function encrypt($data) {
return base64_encode(RSA::rsa_encrypt($data,$this->public_key,$this->modulus,$this->key_length));
}
public function dencrypt($data) {
return RSA::rsa_decrypt($data,$this->private_key,$this->modulus,$this->key_length);
}
public function sign($data) {
return RSA::rsa_sign($data,$this->private_key,$this->modulus,$this->key_length);
}
public function verify($data) {
return RSA::rsa_verify($data,$this->public_key,$this->modulus,$this->key_length);
}
}
class RSAKeyType{
const XMLFile = 0;
const XMLString = 1;
}
certificate.xml:
<RSAKeyValue>
<Modulus>tCZiqDS5BVQQZDBUYbyeoP4rENN4mX5FZJjjMNfGbyzfzH45RY2/YsMaY0yI1jMCOpukvkUyl153tcn0LXhMCDdsEhhZPoKbPUGMniKtFGjs18rv/b5FFUUW1utgwoL8+WJqjOqhQGgvbja63X9+WMFP0nM3d8yudn9C/X55KyM=</Modulus>
<Exponent>AQAB</Exponent>
<P>5HXvmU4IfqUG2jFLSqi/BMEQ3x1NsUDvx3zN5O1p9yLLspJ4sqAt4RUkxzcGodYgBSdXsR9IGcPwjQfbx3a7nQ==</P>
<Q>yd2hDCF/5Zqtz9DXjY1NRYGvBjTS4AQn83ERR46Y5eBSnLjpVjv6gPfARuhsUP44nikrQPvwPnjxQcOhJaOlvw==</Q>
<DP>ztuqUplBP8qU5cN0dOlN7DQT3rFdw30Unv/2Pa5qIAc1gT72YmZ+pCrM3kSIkMicvY3d7NZyJkIv8MKI0ZZEUQ==</DP>
<DQ>QFLJ5YarLWubZPQEK4vSCornTY/5ff51CIKH4ghTOjS/vkbBu4PDL+NCNpYLJcfMHMG7kap2BEIfhjgjGk5KGw==</DQ>
<InverseQ>WE6TqpcexQJwt9Mnp1FbeLtarBcFkXVdBauouFKHcbHCfQjA3IjUrGTxgSO74O/4QSKqaF2gnlL6GI7gKuGbzQ==</InverseQ> <D>czYtWDfHsFGv3fNOs+cGaB3E+xDTiw7HYGuquJz2qjk/s69x/zqFEKuIH8Ndq+eZYFQUCx+EGGxxENDkmYPa0z8wbfFI6JEHpxaLmQfpkkbSL1BJIp9Z5BNM2gy6jJqgbWwQPcN/4jpiMefHZWAqhMKqenUu1KIq1ZX6Bz5xKYk=</D>
</RSAKeyValue>
感谢您的帮助,我应该在课堂上做些什么更改以避免这种错误?
答案 0 :(得分:1)
在我的本地环境中,代码可以平稳运行,并且可以在http://phpfiddle.org/(PHP 7.0.33)上运行!但是,对于后者,密钥必须作为字符串传递,因为在线没有可用的文件系统:
$privateKey = "<RSAKeyValue>...</RSAKeyValue>";
$processor = new RSAProcessor($privateKey, RSAKeyType::XMLString);
另一方面,相同的代码在http://sandbox.onlinephpfunctions.com/(PHP 7.01-PHP 7.3.5)上失败,并带有与您相同的错误消息。原因是方法simplexml_load_string()
被禁用。因此无法加载密钥,并且$modulus
类的成员变量$key_length
,$private_key
,$public_key
和RSAProcessor
获得值0
。结果,用add_PKCS1_padding
调用的方法$blocksize=$keylength/8
为$pad_length=$blocksize-3-strlen($data)
确定一个负值,这透明地导致错误消息 str_repeat():第二个参数必须更大调用str_repeat("\xFF", $pad_length)
时等于或等于0 。
如果在本地环境中禁用方法simplexml_load_file
,则可以完全重现此行为。由于该代码原则上可以正常工作,因此可以假定系统上的方法也被禁用,尤其是simplexml_load_file
。
可以通过从disable_functions
的{{1}}列表中删除禁用的方法来启用它们。
更新:
正如评论中已经提到的那样,RSA受绝大多数库的支持,例如php.ini
,here,它还支持您的代码here中使用的密钥格式。
通常对于PKCS#1,不是数据本身,而是其带有先前摘要信息(phpseclib
值的DER编码)的哈希值是根据RFC 8017签名的,另请参见{{3} },因此也必须指定摘要。假设您的数据(即传递到DigestInfo
方法的$data
)遵循此约定,即:
RSAProcessor#sign
以下使用phpseclib-library(以SHA256作为摘要)的代码将生成 same 签名:
$dataToSign = 'The quick brown fox jumps over the lazy dog';
$data = hex2bin('3031300d060960864801650304020105000420' . hash('SHA256', $dataToSign, false));
然后两个代码都提供以下签名(作为十六进制字符串):
include('RSA.php');
include('BigInteger.php');
$rsa = new Crypt_RSA();
$privateKey = "<RSAKeyValue>...</RSAKeyValue>";
$dataToSign = 'The quick brown fox jumps over the lazy dog';
$rsa->setPrivateKeyFormat(CRYPT_RSA_PRIVATE_FORMAT_XML); // private key format
$rsa->loadKey($privateKey);
$rsa->setHash('sha256'); // digest for signing
$rsa->setSignatureMode(CRYPT_RSA_SIGNATURE_PKCS1); // RSASSA-PKCS1-v1_5-padding
$signature = $rsa->sign($dataToSign);
echo 'Signature (hex): ' . bin2hex($signature) . "\n";
echo 'Signature (base64): ' . base64_encode($signature) . "\n";
更新2:
对于SHA1,可以如下确定代码的ID和哈希值:
6f00eb1126470e097991aaa1e3e94b49a7b8de6c9b2bf683382f96563479b87067be20635ccc1d36fedff9d60f682fdefcb108f5351dc672ebb442e49231d0306b302b258f6b21fb724b59ad765151f6c724de214d41afa0e1b08228b070c537020df8acf9cad5f2fdde63bc698875527a52e49155bd5e2fd761f541844e92bb
或
$data = hex2bin('3021300906052b0e03021a05000414' . hash('SHA1', $dataToSign, false));
可以使用here函数或hash
函数。在这两种情况下,最后一个参数$data = hex2bin('3021300906052b0e03021a05000414' . SHA1($dataToSign, false));
控制返回值是二进制($raw_output
)还是十六进制字符串(TRUE
)。由于具有ID的串联,我将哈希作为十六进制字符串返回,进行串联,最后使用sha1
显式转换为二进制表示形式。还可以在hex2bin
中找到摘要ID。
在phpseclib代码中
FALSE
必须使用。