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File: README.md
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Description: Documentation
Class: PHP Random Bytes
Generate cryptographically strong random bytes
Author: By
Last change: revise README.md
Date: 2 years ago
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Contents

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Random Bytes

Generate cryptographically-strong random bytes.

Purpose

Create random bytes – as cryptographically-strong as possible – from available sources of entropy, and display in different output formats.

Crypto Sources

  • Linux/Unix: OpenSSL, `random_bytes()`, /dev/urandom
  • Windows: OpenSSL, `random_bytes()`

Random Bytes Definitions:

  • openssl
  • random_bytes
  • urandom

Usage

Prototype

    array RandomBytes::generate(int $length, string $source);

Example

    require('randombytes.class.php');
    use Tinram\RandomBytes\RandomBytes;
    $aData = RandomBytes::generate(32, 'openssl');
    var_dump($aData);

Details

The random bytes generated are only as good as the underlying entropy generator of the OS.

Linux's /dev/urandom entropy source is a non-blocking generator 'suitable for most cryptographic purposes'. (/dev/random, being blocking, isn't suitable for this script.)

OpenBSD and FreeBSD have non-blocking /dev/random implementations.

The random_bytes() function was added to PHP version 7.0

License

Random Bytes is released under the GPL v.3.

For more information send a message to info at phpclasses dot org.