Posted by Beno�t on 09/19/05 13:17

Hi,
I have generated two keys :
"C:>openssl req -nodes -new -x509 -keyout ben.key -out ben.crt -days
3650"
I try to encrypt/decrypt a string like "JOHN" with these asymetrics
keys. With the following code, it works.
I encrypt with the public key which is in the certificate.
I decrypt with the private key.
But why, the crypted message is different every time I start the
programm...?
_________________________________________________________
<?php
echo "---CRYPT---<BR>";
$source="JOHN";
echo "Message : $source<BR>";
$fp=fopen("./ben.crt","r");
$pub_key=fread ($fp,8192);
fclose($fp);
//echo $pub_key;
openssl_get_publickey($pub_key);
openssl_public_encrypt ($source,$sourcecrypt,$pub_key);
echo "Crypted message : ".$sourcecrypt."<BR><BR>";
$source="";


echo "---DECRYPT---<BR>";
echo "Crypted message : ".$sourcecrypt."<BR>";
$fp=fopen("./ben.key","r");
$priv_key=fread ($fp,8192);
fclose($fp);
$res=openssl_get_privatekey($priv_key);
openssl_private_decrypt ($sourcecrypt,$newsource,$res);
echo "Source decryptée : $newsource<BR><BR>";
?>
___________________________________________________________

Now here is my second question :
In fact I encrypt with a java programm where is my certificate and I
decrypt with a PHP programm like I've just explane before.

___________________________________________________________
public String crypt(String message) {

//Cert is in LDAP
Certificate cert =
userProvider.getUserCertificate(getCurrentUsername());

PublicKey publicKey = cert.getPublicKey();

try{
Provider secProvider = Security.getProvider("BC");
if (secProvider == null) {
secProvider = new BouncyCastleProvider();
Security.addProvider(secProvider);
}
Cipher encryptCipher = Cipher.getInstance("RSA", secProvider);
encryptCipher.init(Cipher.ENCRYPT_MODE, publicKey);

//Crypt...
String resultCrypt = new String();
byte[] messageBytes = message.getBytes();
byte[] resultCryptBytes = encryptCipher.doFinal(messageBytes);
resultCrypt = arr2str(resultCryptBytes);

return resultCrypt ;

}catch(Exception e){
//throw ...
}
}
________________________________________________________________

Why my programm PHP can't decrypt the message? I use evidently the
correct private key which corresponds with the public key.

Thanks for your answers...

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