Set password provider callback function

# rnp_ffi_set_pass_provider

(PECL rnp >= 0.1.1)

rnp_ffi_set_pass_provider — Set password provider callback function

### Description

rnp_ffi_set_pass_provider(RnpFFI `$ffi`, callable `$password_callback`): bool

Sets password provider function. This function can ask for the password on a standard input (if PHP script is executed in a command line environment), display GUI dialog or provide password in any other possible ways. Requested passwords are used to encrypt or decrypt secret keys or perform symmetric encryption/decryption operations.

### Parameters

`ffi`
  The FFI object returned by rnp_ffi_create().
`password_callback`

  The function that is to be called for every password request. It has the following signature:

  password_callback(string `$key_fp`, string `$pgp_context`, string `&$password`): bool
  - `$key_fp` - The key fingerprint, if any. Can be empty.
  - `$pgp_context` - String describing why the key is being requested.
  - `$password` - Password string reference where provided password should be stored to.
  Callback function should return `true` if password was successfully set or `false` on failure.

### Return Values

Returns `true` on success or `false` on failure.

### Examples

Example #1 simple callback function example

`<?php
function password_callback(string $key_fp, string $pgp_context, string &$password)
{
$password = "password";
return true;
}
$ffi = rnp_ffi_create('GPG', 'GPG');
rnp_ffi_set_pass_provider($ffi, 'password_callback');`
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