PHP 7.1.24 Released

sodium_crypto_aead_chacha20poly1305_ietf_encrypt

(PHP 7 >= 7.2.0)

sodium_crypto_aead_chacha20poly1305_ietf_encryptEncrypt a message

Description

string sodium_crypto_aead_chacha20poly1305_ietf_encrypt ( string $msg , string $ad , string $nonce , string $key )

Warning

This function is currently not documented; only its argument list is available.

Parameters

msg

ad

nonce

key

Return Values

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User Contributed Notes 1 note

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craig at craigfrancis dot co dot uk
9 months ago
Here's a quick example on how to use sodium_crypto_aead_chacha20poly1305_ietf_encrypt(); where you have 1 key to encrypt and decrypt.

<?php

$key
= sodium_crypto_aead_chacha20poly1305_ietf_keygen();

//--------------------------------------------------
// Encrypting

$message = 'hello';

$nonce = random_bytes(SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_IETF_NPUBBYTES);

$encrypted = sodium_crypto_aead_chacha20poly1305_ietf_encrypt($message, $nonce, $nonce, $key);

echo
base64_encode($encrypted) . "\n";

//--------------------------------------------------
// Decrypting

$decrypted = sodium_crypto_aead_chacha20poly1305_ietf_decrypt($encrypted, $nonce, $nonce, $key);

echo
$decrypted . "\n";

?>

And just to confirm, the $nonce is used twice - the first time it's in the authentication tag ($ad):

https://twitter.com/craigfrancis/status/949614546259513344
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