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PHP Sodium Compat: Cryptographic functions of libsodium in pure PHP

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sodium-compat 1.5.30Custom (specified...5.2.4PHP 5, Cryptography, Security
Description 

Authors

Paragon Initiative Enterprises
Frank Denis


Contributor

This package provides cryptographic functions of libsodium in pure PHP.

It is a polyfill library for ext/sodium written as pure PHP classes that works since PHP 5.2.4.

The libsodium extension provides classes to generate random data, secret key and public key cryptography including X25519 and Ed25519, hashing, etc..

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PHP Programming Innovation award nominee
January 2017
Number 8
libSodium is cryptography library for which there is a PHP extension. It provides encryption, hashing and verification functions to PHP applications.

It is a simpler and actively supported library that provides means to perform cryptography actions without having to learn too much about cyphers.

This package provides a pure PHP polyfill implementation of libsodium, so it works even when the libsodium extension is not available.

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Documentation

Sodium Compat

Build Status Psalm Status Windows Build Status Latest Stable Version Latest Unstable Version License Downloads

Sodium Compat is a pure PHP polyfill for the Sodium cryptography library (libsodium), a core extension in PHP 7.2.0+ and otherwise available in PECL.

This library tentatively supports PHP 5.2.4 - 8.x (latest), but officially only supports non-EOL'd versions of PHP.

If you have the PHP extension installed, Sodium Compat will opportunistically and transparently use the PHP extension instead of our implementation.

IMPORTANT!

This cryptography library has not been formally audited by an independent third party that specializes in cryptography or cryptanalysis.

If you require such an audit before you can use sodium_compat in your projects and have the funds for such an audit, please open an issue or contact security at paragonie dot com so we can help get the ball rolling.

However, sodium_compat has been adopted by high profile open source projects, such as Joomla! and Magento. Furthermore, sodium_compat was developed by Paragon Initiative Enterprises, a company that specializes in secure PHP development and PHP cryptography, and has been informally reviewed by many other security experts who also specialize in PHP.

If you'd like to learn more about the defensive security measures we've taken to prevent sodium_compat from being a source of vulnerability in your systems, please read Cryptographically Secure PHP Development.

Installing Sodium Compat

If you're using Composer:

composer require paragonie/sodium_compat

Install From Source

If you're not using Composer, download a release tarball (which should be signed with our GnuPG public key), extract its contents, then include our autoload.php script in your project.

<?php
require_once "/path/to/sodium_compat/autoload.php";

PHP Archives (Phar) Releases

Since version 1.3.0, sodium_compat releases include a PHP Archive (.phar file) and associated GPG signature. First, download both files and verify them with our GPG public key, like so:

# Getting our public key from the keyserver:
gpg --fingerprint 7F52D5C61D1255C731362E826B97A1C2826404DA
if [ $? -ne 0 ]; then
    echo -e "\033[33mDownloading PGP Public Key...\033[0m"
    gpg  --keyserver pgp.mit.edu --recv-keys 7F52D5C61D1255C731362E826B97A1C2826404DA
    # Security <security@paragonie.com>
    gpg --fingerprint 7F52D5C61D1255C731362E826B97A1C2826404DA
    if [ $? -ne 0 ]; then
        echo -e "\033[31mCould not download PGP public key for verification\033[0m"
        exit 1
    fi
fi

# Verifying the PHP Archive
gpg --verify sodium-compat.phar.sig sodium-compat.phar

Now, simply include this .phar file in your application.

<?php
require_once "/path/to/sodium-compat.phar";

Support

Commercial support for libsodium is available from multiple vendors. If you need help using sodium_compat in one of your projects, contact Paragon Initiative Enterprises.

Non-commercial report will be facilitated through Github issues. We offer no guarantees of our availability to resolve questions about integrating sodium_compat into third-party software for free, but will strive to fix any bugs (security-related or otherwise) in our library.

Support Contracts

If your company uses this library in their products or services, you may be interested in purchasing a support contract from Paragon Initiative Enterprises.

Using Sodium Compat

True Polyfill

As per the second vote on the libsodium RFC, PHP 7.2 uses sodium_* instead of \Sodium\*.

<?php
require_once "/path/to/sodium_compat/autoload.php";

$alice_kp = sodium_crypto_sign_keypair();
$alice_sk = sodium_crypto_sign_secretkey($alice_kp);
$alice_pk = sodium_crypto_sign_publickey($alice_kp);

$message = 'This is a test message.';
$signature = sodium_crypto_sign_detached($message, $alice_sk);
if (sodium_crypto_sign_verify_detached($signature, $message, $alice_pk)) {
    echo 'OK', PHP_EOL;
} else {
    throw new Exception('Invalid signature');
}

Polyfill For the Old PECL Extension API

If you're using PHP 5.3.0 or newer and do not have the PECL extension installed, you can just use the standard ext/sodium API features as-is and the polyfill will work its magic.

<?php
require_once "/path/to/sodium_compat/autoload.php";

$alice_kp = \Sodium\crypto_sign_keypair();
$alice_sk = \Sodium\crypto_sign_secretkey($alice_kp);
$alice_pk = \Sodium\crypto_sign_publickey($alice_kp);

$message = 'This is a test message.';
$signature = \Sodium\crypto_sign_detached($message, $alice_sk);
if (\Sodium\crypto_sign_verify_detached($signature, $message, $alice_pk)) {
    echo 'OK', PHP_EOL;
} else {
    throw new Exception('Invalid signature');
}

The polyfill does not expose this API on PHP < 5.3, or if you have the PHP extension installed already.

General-Use Polyfill

If your users are on PHP < 5.3, or you want to write code that will work whether or not the PECL extension is available, you'll want to use the ParagonIE_Sodium_Compat class for most of your libsodium needs.

The above example, written for general use:

<?php
require_once "/path/to/sodium_compat/autoload.php";

$alice_kp = ParagonIE_Sodium_Compat::crypto_sign_keypair();
$alice_sk = ParagonIE_Sodium_Compat::crypto_sign_secretkey($alice_kp);
$alice_pk = ParagonIE_Sodium_Compat::crypto_sign_publickey($alice_kp);

$message = 'This is a test message.';
$signature = ParagonIE_Sodium_Compat::crypto_sign_detached($message, $alice_sk);
if (ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $alice_pk)) {
    echo 'OK', PHP_EOL;
} else {
    throw new Exception('Invalid signature');
}

Generally: If you replace \Sodium\ with ParagonIE_Sodium_Compat::, any code already written for the libsodium PHP extension should work with our polyfill without additional code changes.

Since this doesn't require a namespace, this API is exposed on PHP 5.2.

Since version 0.7.0, we have our own namespaced API (ParagonIE\Sodium\*) to allow brevity in software that uses PHP 5.3+. This is useful if you want to use our file cryptography features without writing ParagonIE_Sodium_File every time. This is not exposed on PHP < 5.3, so if your project supports PHP < 5.3, use the underscore method instead.

To learn how to use Libsodium, read Using Libsodium in PHP Projects.

Help, Sodium_Compat is Slow! How can I make it fast?

There are three ways to make it fast:

  1. Use a newer version of PHP (at least 7.2).
  2. Install the libsodium PHP extension from PECL.
  3. Only if the previous two options are not available for you: 1. Verify that the processor you're using actually implements constant-time multiplication. Sodium_compat does, but it must trade some speed in order to attain cross-platform security. 2. Only if you are 100% certain that your processor is safe, you can set `ParagonIE_Sodium_Compat::$fastMult = true;` without harming the security of your cryptography keys. If your processor isn't safe, then decide whether you want speed or security because you can't have both.

How can I tell if sodium_compat will be slow, at runtime?

Since version 1.8, you can use the polyfill_is_fast() static method to determine if sodium_compat will be slow at runtime.

<?php
if (ParagonIE_Sodium_Compat::polyfill_is_fast()) {
    // Use libsodium now
    $process->execute();
} else {
    // Defer to a cron job or other sort of asynchronous process
    $process->enqueue();
}

Help, my PHP only has 32-Bit Integers! It's super slow!

If the PHP_INT_SIZE constant equals 4 instead of 8 (PHP 5 on Windows, Linux on i386, etc.), you will run into significant performance issues.

In particular: public-key cryptography (encryption and signatures) is affected. There is nothing we can do about that.

The root cause of these performance issues has to do with implementing cryptography algorithms in constant-time using 16-bit limbs (to avoid overflow) in pure PHP.

To mitigate these performance issues, simply install PHP 7.2 or newer and enable the sodium extension.

Affected users are encouraged to install the sodium extension (or libsodium from older version of PHP).

Windows users on PHP 5 may be able to simply upgrade to PHP 7 and the slowdown will be greatly reduced.

Documentation

First, you'll want to read the Libsodium Quick Reference. It aims to answer, "Which function should I use for [common problem]?".

If you don't find the answers in the Quick Reference page, check out Using Libsodium in PHP Projects.

Finally, the official libsodium documentation (which was written for the C library, not the PHP library) also contains a lot of insightful technical information you may find helpful.

API Coverage

Recommended reading: Libsodium Quick Reference

  • Mainline NaCl Features * `crypto_auth()` * `crypto_auth_verify()` * `crypto_box()` * `crypto_box_open()` * `crypto_scalarmult()` * `crypto_secretbox()` * `crypto_secretbox_open()` * `crypto_sign()` * `crypto_sign_open()`
  • PECL Libsodium Features * `crypto_aead_aes256gcm_encrypt()` * `crypto_aead_aes256gcm_decrypt()` * `crypto_aead_chacha20poly1305_encrypt()` * `crypto_aead_chacha20poly1305_decrypt()` * `crypto_aead_chacha20poly1305_ietf_encrypt()` * `crypto_aead_chacha20poly1305_ietf_decrypt()` * `crypto_aead_xchacha20poly1305_ietf_encrypt()` * `crypto_aead_xchacha20poly1305_ietf_decrypt()` * `crypto_box_xchacha20poly1305()` * `crypto_box_xchacha20poly1305_open()` * `crypto_box_seal()` * `crypto_box_seal_open()` * `crypto_generichash()` * `crypto_generichash_init()` * `crypto_generichash_update()` * `crypto_generichash_final()` * `crypto_kx()` * `crypto_secretbox_xchacha20poly1305()` * `crypto_secretbox_xchacha20poly1305_open()` * `crypto_shorthash()` * `crypto_sign_detached()` * `crypto_sign_ed25519_pk_to_curve25519()` * `crypto_sign_ed25519_sk_to_curve25519()` * `crypto_sign_verify_detached()` * For advanced users only: * `crypto_core_ristretto255_add()` * `crypto_core_ristretto255_from_hash()` * `crypto_core_ristretto255_is_valid_point()` * `crypto_core_ristretto255_random()` * `crypto_core_ristretto255_scalar_add()` * `crypto_core_ristretto255_scalar_complement()` * `crypto_core_ristretto255_scalar_invert()` * `crypto_core_ristretto255_scalar_mul()` * `crypto_core_ristretto255_scalar_negate()` * `crypto_core_ristretto255_scalar_random()` * `crypto_core_ristretto255_scalar_reduce()` * `crypto_core_ristretto255_scalar_sub()` * `crypto_core_ristretto255_sub()` * `crypto_scalarmult_ristretto255_base()` * `crypto_scalarmult_ristretto255()` * `crypto_stream()` * `crypto_stream_keygen()` * `crypto_stream_xor()` * `crypto_stream_xchacha20()` * `crypto_stream_xchacha20_keygen()` * `crypto_stream_xchacha20_xor()` * `crypto_stream_xchacha20_xor_ic()` Other utilities (e.g. `crypto__keypair()`) * `add()` * `base642bin()` * `bin2base64()` * `bin2hex()` * `hex2bin()` * `crypto_kdf_derive_from_key()` * `crypto_kx_client_session_keys()` * `crypto_kx_server_session_keys()` * `crypto_secretstream_xchacha20poly1305_init_push()` * `crypto_secretstream_xchacha20poly1305_push()` * `crypto_secretstream_xchacha20poly1305_init_pull()` * `crypto_secretstream_xchacha20poly1305_pull()` * `crypto_secretstream_xchacha20poly1305_rekey()` * `pad()` * `unpad()`

Cryptography Primitives Provided

  • X25519 - Elliptic Curve Diffie Hellman over Curve25519
  • Ed25519 - Edwards curve Digital Signature Algorithm over Curve25519
  • Xsalsa20 - Extended-nonce Salsa20 stream cipher
  • ChaCha20 - Stream cipher
  • Xchacha20 - Extended-nonce ChaCha20 stream cipher
  • Poly1305 - Polynomial Evaluation Message Authentication Code modulo 2^130 - 5
  • BLAKE2b - Cryptographic Hash Function
  • SipHash-2-4 - Fast hash, but not collision-resistant; ideal for hash tables.

Features Excluded from this Polyfill

  • `\Sodium\memzero()` - Although we expose this API endpoint, we can't reliably zero buffers from PHP.

    If you have the PHP extension installed, sodium_compat will use the native implementation to zero out the string provided. Otherwise it will throw a `SodiumException`.

  • `\Sodium\crypto_pwhash()` - It's not feasible to polyfill scrypt or Argon2 into PHP and get reasonable performance. Users would feel motivated to select parameters that downgrade security to avoid denial of service (DoS) attacks.

    The only winning move is not to play.

    If ext/sodium or ext/libsodium is installed, these API methods will fallthrough to the extension. Otherwise, our polyfill library will throw a `SodiumException`.

    To detect support for Argon2i at runtime, use `ParagonIE_Sodium_Compat::crypto_pwhash_is_available()`, which returns a boolean value (`TRUE` or `FALSE`).

PHPCompatibility Ruleset

For sodium_compat users and that utilize PHPCompatibility in their CI process, there is now a custom ruleset available which can be used to prevent false positives being thrown by PHPCompatibility for the native PHP functionality being polyfilled by this repo.

You can find the repo for the PHPCompatibilityParagonieSodiumCompat ruleset here on Github and on Packagist.


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  Files folder image Files  /  tests  /  unit  /  wycheproof  
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  Accessible without login Plain text file README.md Doc. Documentation
  Accessible without login Plain text file x25519_test.json Data Auxiliary data
  Accessible without login Plain text file xchacha20_poly1305_test.json Data Auxiliary data

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