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# openssl_private_encrypt

(PHP 4 >= 4.0.6, PHP 5)

openssl_private_encrypt -- Encrypts data with private key

## Description

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

Warning
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.

openssl_private_encrypt() encrypts data with private key and stores the result into crypted. Encrypted data can be decrypted via openssl_public_decrypt(). padding defaults to `OPENSSL_PKCS1_PADDING`, but can also be `OPENSSL_NO_PADDING`.

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 openssl_public_encrypt().

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