PHP 8.0.6 Released!

openssl_private_decrypt

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

openssl_private_decryptDecrypts data with private key

Description

openssl_private_decrypt ( string $data , string &$decrypted_data , OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $private_key , int $padding = OPENSSL_PKCS1_PADDING ) : bool

openssl_private_decrypt() decrypts data that was previously encrypted via openssl_public_encrypt() and stores the result into decrypted_data.

You can use this function e.g. to decrypt data which is supposed to only be available to you.

Parameters

data

decrypted_data

private_key

private_key must be the private key corresponding that was used to encrypt the data.

padding

padding can be one of OPENSSL_PKCS1_PADDING, OPENSSL_SSLV23_PADDING, OPENSSL_PKCS1_OAEP_PADDING, OPENSSL_NO_PADDING.

Return Values

Returns true on success or false on failure.

Changelog

Version Description
8.0.0 private_key accepts an OpenSSLAsymmetricKey or OpenSSLCertificate instance now; previously, a resource of type OpenSSL key or OpenSSL X.509 was accepted.

See Also

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User Contributed Notes 3 notes

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8
wfredkNOSPAM at L5DevelopmentNOSPAM dot com
19 years ago
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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0
Anonymous
1 month ago
<?php

// Generate keys in console:
// $ openssl genrsa -out private_key 8192
// $ openssl rsa -in private_key -out public_key.pem -pubout -outform PEM

// Test data
$data = 'Hello world';

// Encrypt data with public key
$publicKey = file_get_contents('public_key.pem');
$encrypted = null;

openssl_public_encrypt($data, $encrypted, $publicKey);

echo
'Encrypted data', PHP_EOL;
echo
base64_encode($encrypted), PHP_EOL;

echo
PHP_EOL;

// Decrypt data with private key
$privateKey = file_get_contents('private_key');
$decrypted = null;

openssl_private_decrypt($encrypted, $decrypted, $privateKey);

echo
'Decrypted data', PHP_EOL;
echo
$decrypted, PHP_EOL;
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-40
tjusongchao at gmail dot com
6 years ago
of course you have to add the openssl extension to you php environment.
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