openssl_private_encrypt

bool openssl_private_encrypt ( string $data , string &$crypted , mixed $key [, int $padding = OPENSSL_PKCS1_PADDING ] )

Encrypts data with private key

openssl_private_encrypt() encrypts data with private key and stores the result into crypted. Encrypted data can be decrypted via openssl_public_decrypt().


Encrypt using private key, decrypt using public key.Use this for posting signed messages: Anyone with access to your public key can read it, but they can't create one with your signature.

echo "Source: $source";
$fp=fopen("/path/to/private.key","r");
$priv_key=fread($fp,8192);
fclose($fp);
// $passphrase is required if your key is encoded (suggested)
$res = openssl_get_privatekey($priv_key,$passphrase);
/*
 * NOTE:  Here you use the returned resource value
 */
openssl_private_encrypt($source,$crypttext,$res);
echo "String crypted: $crypttext";

$fp=fopen ("/path/to/certificate.crt","r");
$pub_key=fread($fp,8192);
fclose($fp);
openssl_get_publickey($pub_key);
/*
 * NOTE:  Here you use the $pub_key value (converted, I guess)
*/
openssl_public_decrypt($crypttext,$newsource,$pub_key);
echo "String decrypt : $newsource";