Description:
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When i try to encrypt big string it return null. If i try to use big key to encrypt - it help my, but if i use a big sting (300 000 signs) - it isn't work. 
i try encrypt big string by part, it's ok, but then i try to decrypt it - openssl_public_decrypt make a null decrypt text...

certificate is OK - under MS BizTolk server it's work right.


Reproduce code:
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prkeyid = openssl_pkey_get_private("file://c:/cert/CAkey.pem", '1234');
$pubkeyid = openssl_pkey_get_public("file://c:/cert/CAcert.pem");

openssl_private_encrypt($res,$crypttext,$prkeyid);
$fp = fopen ("c:/file.xml", "w+");
// for test
fwrite ($fp, $crypttext);
fclose ($fp);

openssl_public_decrypt($crypttext, $ext_data, $pubkeyid);
$fp = fopen ("c:/file2.xml", "w+");
fwrite ($fp, $ext_data);
fclose ($fp);

Actual result:
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null