Decrypts an S/MIME encrypted message

# openssl_pkcs7_decrypt

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

openssl_pkcs7_decrypt — Decrypts an S/MIME encrypted message

### Description

openssl_pkcs7_decrypt(
string `$input_filename`,
string `$output_filename`,
#[\SensitiveParameter] OpenSSLCertificate|string `$certificate`,
#[\SensitiveParameter] OpenSSLAsymmetricKey|OpenSSLCertificate|array|string|null `$private_key` = `null`
): bool

Decrypts the S/MIME encrypted message contained in the file specified by `input_filename` using the certificate and its associated private key specified by `certificate` and `private_key`.

### Parameters

`input_filename`

`output_filename`

  The decrypted message is written to the file specified by `output_filename`.

`certificate`

`private_key`

### 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 CSR` was accepted.

### Examples

Example #1 openssl_pkcs7_decrypt() example

`<?php
// $cert and $key are assumed to contain your personal certificate and private
// key pair, and that you are the recipient of an S/MIME message
$infilename = "encrypted.msg"; // this file holds your encrypted message
$outfilename = "decrypted.msg"; // make sure you can write to this file
if (openssl_pkcs7_decrypt($infilename, $outfilename, $cert, $key)) {
echo "decrypted!";
} else {
echo "failed to decrypt!";
}
?>`
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