Last updated: Fri, 20 May 2011

openssl_private_decrypt

(PHP 4 >= 4.0.6, PHP 5)

openssl_private_decrypt — Desencripta información con la clave privada

Descripción

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

openssl_private_decrypt() desncripta la información data la cuál fue previamente encriptada mediante openssl_public_encrypt() y almacena el resultado en decrypted.

Puede usar esta función para, por ejemplo, desencriptar información que es sólo para usted.

Parámetros

data
decrypted
key: key debe ser la clave privada correspondiente a la usada para encriptar la información.
padding: padding puede ser OPENSSL_PKCS1_PADDING, OPENSSL_SSLV23_PADDING, OPENSSL_PKCS1_OAEP_PADDING, OPENSSL_NO_PADDING.

Valores devueltos

Devuelve TRUE en caso de éxito o FALSE en caso de error.

Ver también

openssl_public_encrypt() - Encripta información con una clave pública
openssl_public_decrypt() - Desencripta información con la clave pública

add a note User Contributed Notes openssl_private_decrypt

sevaa at sprynet dot com 03-Oct-2009 02:08


When used with RSA, this function only accepts a single block. Block size is equal to the RSA key size - i. e., with a 1024-bit key, block size should be 128 bytes. Depending on the padding scheme, the payload may be even smaller. The padding is removed, so you'll receive the ready to use plaintext. Blocking logic is up to the caller, though.



When passing Microsoft CryptoAPI-generated RSA cyphertext, revert the bytes in the block (you may use strrev()).

wfredkNOSPAM at L5DevelopmentNOSPAM dot com 08-Mar-2002 11:58


Encrypt using public key, decrypt using private key.



Use this to store stuff in your database: Unless someone

has your private key, the database contents are useless.



Also, use this for sending to a specific individual:  Get

their public key, encrypt the message, only they can use

their private key to decode it.



<?php

echo "Source: $source";

$fp=fopen("/path/to/certificate.crt","r");

$pub_key=fread($fp,8192);

fclose($fp);

openssl_get_publickey($pub_key);

/*

 * NOTE:  Here you use the $pub_key value (converted, I guess)

 */

openssl_public_encrypt($source,$crypttext,$pub_key);

echo "String crypted: $crypttext";



$fp=fopen("/path/to/private.key","r");

$priv_key=fread($fp,8192);

fclose($fp);

// $passphrase is required if your key is encoded (suggested)

$res = openssl_get_privatekey($priv_key,$passphrase);

/*

 * NOTE:  Here you use the returned resource value

 */

openssl_private_decrypt($crypttext,$newsource,$res);

echo "String decrypt : $newsource";

?>

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