openssl_pkey_get_private returns string '' - php

Question

Recently I use openssl generate RSA Private Key to encrypted my data.
$private_key = "-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDGCn4a42xSG6Hs0h+BSWG/MQmXOpIqd6ptlfFxMFQeL9bvJ9jR j0842NyaWIAedxQrv/0+XC5pYF8ExrcGXCnWtCpUTK2M6cgkTLgkkptLz5N+z8jd AeSbakKkJuQEgEyKI1cIrjRhz6u6yfjoPKZAmVdlwEDN1u4TweZ1HDDxHQIDAQAB AoGANPgvfI+htGBxsf8NsC3peBLspsdiuvsg2YjGeGjdxukyyurUglCbdvACKUJM mlltSrpiSOCtBUBiicuAvrG9+pdjQb1gPui/xj83ZbNytfG6K8UFk6cokH6fEgON Pd3npWlhXwdrJUxcFLzlJzREq18VyAWwgsbH82//ineOF6ECQQD3HOpE+IQ2JDIL Kxna/rVnW5RSvImddKksC4KLk7IsMFqsfo+e/Vkf3D7vmsMDCXCNpt5+ttLF93lU 3Iz1j/bJAkEAzSnJ4kp9rsvf7X5OqLWOJjR6CDGK3RSwSXeSMoJSIvV6rSXXQryU ltiYct5A5Oi3g49cOYNuYMt1bw3uTEVNtQJBAKqR7e8fr3sDrvtgi99LE4I9h3s4 orDp1uANLdYUY9b2pZANaCtxavR//X08UUGmYWeVeFz06zY05S47cp0J+2kCQEyk CbixHxZHLtWnU3cOq5V2EQgyia9g5SHsuv6HVGuezD8WXb2eeNuI+hofEJrynGtX CJqrkHY0SyA7UgPH9+kCQQDRrxJ4plB0nWqhLpdc3OV74vW0m11LS8+270nMMVN1 IP08iRfF4ASWEXoe5A2LNEP4ydFw68Ve08WaRwSJ65kn -----END RSA PRIVATE KEY-----";
$pi_key = openssl_pkey_get_private($private_key);
var_dump($pikey."\n");
return:
string(1) "
"
I use it at my local wampserver,But I get return data is resource.
string(16) "Resource id #46
"
My openssl version:

Answer 1

OpenSSL is pretty picky when it comes to keys. All that base64-encoded data needs to span multiple lines, each of which is, at most, 64 lines long. I used phpseclib to convert you key and it worked fine for me after the conversion (whereas it didn't before):
<?php
include('Crypt/RSA.php');
$key = '-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDGCn4a42xSG6Hs0h+BSWG/MQmXOpIqd6ptlfFxMFQeL9bvJ9jR j0842NyaWIAedxQrv/0+XC5pYF8ExrcGXCnWtCpUTK2M6cgkTLgkkptLz5N+z8jd AeSbakKkJuQEgEyKI1cIrjRhz6u6yfjoPKZAmVdlwEDN1u4TweZ1HDDxHQIDAQAB AoGANPgvfI+htGBxsf8NsC3peBLspsdiuvsg2YjGeGjdxukyyurUglCbdvACKUJM mlltSrpiSOCtBUBiicuAvrG9+pdjQb1gPui/xj83ZbNytfG6K8UFk6cokH6fEgON Pd3npWlhXwdrJUxcFLzlJzREq18VyAWwgsbH82//ineOF6ECQQD3HOpE+IQ2JDIL Kxna/rVnW5RSvImddKksC4KLk7IsMFqsfo+e/Vkf3D7vmsMDCXCNpt5+ttLF93lU 3Iz1j/bJAkEAzSnJ4kp9rsvf7X5OqLWOJjR6CDGK3RSwSXeSMoJSIvV6rSXXQryU ltiYct5A5Oi3g49cOYNuYMt1bw3uTEVNtQJBAKqR7e8fr3sDrvtgi99LE4I9h3s4 orDp1uANLdYUY9b2pZANaCtxavR//X08UUGmYWeVeFz06zY05S47cp0J+2kCQEyk CbixHxZHLtWnU3cOq5V2EQgyia9g5SHsuv6HVGuezD8WXb2eeNuI+hofEJrynGtX CJqrkHY0SyA7UgPH9+kCQQDRrxJ4plB0nWqhLpdc3OV74vW0m11LS8+270nMMVN1 IP08iRfF4ASWEXoe5A2LNEP4ydFw68Ve08WaRwSJ65kn -----END RSA PRIVATE KEY-----';
$pi_key = openssl_pkey_get_private($key);
var_dump($pi_key);
echo "\r\n";
$rsa = new Crypt_RSA();
$rsa->loadKey($key);
$pi_key = openssl_pkey_get_private($rsa);
var_dump($pi_key);
echo "\r\n";
The first one output bool(false) and the second one returned resource(8) of type (OpenSSL key).