( string data, string &crypted, mixed key [, int padding] )
openssl_private_encrypt() encrypts data
with private key and stores the result into
crypted. Encrypted data can be decrypted via
defaults to OPENSSL_PKCS1_PADDING, but can also be
Returns TRUE on success or FALSE on failure.
This function can be used e.g. to sign data (or its hash) to prove that it
is not written by someone else.
See also openssl_public_decrypt() and