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# Phar::setSignatureAlgorithm

(PHP >= 5.3.0, PECL phar >= 1.1.0)

Phar::setSignatureAlgorithm — set the signature algorithm for a phar and apply it.

### Description

public void Phar::setSignatureAlgorithm ( int `$sigtype` [, string `$privatekey` ] )

> Note:

> This method requires the php.ini setting phar.readonly to be set to 0 in order to work for Phar objects. Otherwise, a PharException will be thrown.

set the signature algorithm for a phar and apply it. The signature algorithm must be one of Phar::MD5, Phar::SHA1, Phar::SHA256, Phar::SHA512, or Phar::OPENSSL.

Note that all executable phar archives have a signature created automatically, SHA1 by default. data tar- or zip-based archives (archives created with the PharData class) must have their signature created and set explicitly via Phar::setSignatureAlgorithm().

### Parameters

`sigtype`

  One of Phar::MD5, Phar::SHA1, Phar::SHA256, Phar::SHA512, or Phar::OPENSSL

`privatekey`

  The contents of an OpenSSL private key, as extracted from a certificate or OpenSSL key file:

  `<?php
  $private = openssl_get_privatekey(file_get_contents('private.pem'));
  $pkey = '';
  openssl_pkey_export($private, $pkey);
  $p->setSignatureAlgorithm(Phar::OPENSSL, $pkey);
  ?>`
  See phar introduction for instructions on naming and placement of the public key file.

### Return Values

No value is returned.

### Errors/Exceptions

Throws UnexpectedValueException for many errors, and a PharException if any problems occur flushing changes to disk.

### See Also

- Phar::getSupportedSignatures() - Return array of supported signature types
- Phar::getSignature() - Return MD5/SHA1/SHA256/SHA512/OpenSSL signature of a Phar archive

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