php openssl 生成公私鑰，根據網上文章整理的

linux下沒有問題，win下有報錯

<?php
$configargs = array(
"config" => "/usr/local/php/ext/openssl/tests/openssl.cnf",
"digest_alg" => "md5",
"private_key_bits" => 4096,
"private_key_type" => OPENSSL_KEYTYPE_RSA,
// 'digest_alg' => 'md5',
//     'x509_extensions' => 'v3_ca',
//     'req_extensions'   => 'v3_req',
//     'private_key_bits' => 666,
//     'private_key_type' => OPENSSL_KEYTYPE_RSA,
//     'encrypt_key' => false,
);
//$res = openssl_pkey_new();
$res = openssl_pkey_new($configargs);
// Get private key
openssl_pkey_export($res, $privkey, '', $configargs);
echo $privkey;
echo "<br>";
echo "<br>";
// Get public key
$pubkey = openssl_pkey_get_details($res);
$pubkey = $pubkey["key"];
echo $pubkey;
echo "<br>";
echo "<br>";
// $res = openssl_pkey_get_private($privkey);
// if (openssl_sign('hello', $out, $res))
// echo base64_encode($out);


$pi_key =  openssl_pkey_get_private($privkey);//這個函數可用來判斷私鑰是否是可用的，可用返回資源id Resource id  
$pu_key = openssl_pkey_get_public($pubkey);//這個函數可用來判斷公鑰是否是可用的  


    $data = "test data";//原始數據  
    $encrypted = "";   
    $decrypted = "";   
      
    echo "source data:",$data,"\n";  
      
    echo "private key encrypt:\n";  
      
    openssl_private_encrypt($data,$encrypted,$pi_key);//私鑰加密  
    $encrypted = base64_encode($encrypted);//加密后的內容通常含有特殊字符，需要編碼轉換下，在網絡間通過url傳輸時要注意base64編碼是否是url安全的  
    echo $encrypted,"\n";  
      
    echo "public key decrypt:\n";  
      
    openssl_public_decrypt(base64_decode($encrypted),$decrypted,$pu_key);//私鑰加密的內容通過公鑰可用解密出來  
    echo $decrypted,"\n";  
      
    echo "---------------------------------------\n";  
    echo "public key encrypt:\n";  
      
    openssl_public_encrypt($data,$encrypted,$pu_key);//公鑰加密  
    $encrypted = base64_encode($encrypted);  
    echo $encrypted,"\n";  
      
    echo "private key decrypt:\n";  
    openssl_private_decrypt(base64_decode($encrypted),$decrypted,$pi_key);//私鑰解密  
    echo $decrypted,"\n"; 
?>