openssl_private_encrypt

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

説明

openssl_private_encrypt() encrypts data with private key and stores the result into crypted. Encrypted data can be decrypted via openssl_public_decrypt(). This function can be used e.g. to sign data (or its hash) to prove that it is not written by someone else.

戻り値

Returns TRUE on success or FALSE on failure.