(PHP 4 >= 4.0.6, PHP 5, PHP 7)
openssl_private_encrypt — Encrypts data with private key
openssl_private_encrypt ( string $data , string &$crypted , mixed $key [, int $padding = OPENSSL_PKCS1_PADDING ] ) : bool
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.
data
crypted
key
padding
padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_NO_PADDING.
Returns true on success or false on failure.
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.openssl-private-encrypt.php