(PHP 4 >= 4.0.6, PHP 5)
openssl_private_encrypt — 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().
This function can be used e.g. to sign data (or its hash) to prove that it is not written by someone else.
padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_NO_PADDING.
成功时返回 TRUE， 或者在失败时返回 FALSE.