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1<?php 
2
3function encrypt($message, $pass)
4{
5    $alg = SODIUM_CRYPTO_PWHASH_ALG_DEFAULT;
6    $opslimit = SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE;
7    $memlimit = SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE;
8    $final = $salt = openssl_random_pseudo_bytes(SODIUM_CRYPTO_PWHASH_SALTBYTES);
9    $secret_key = sodium_crypto_pwhash(SODIUM_CRYPTO_SECRETBOX_KEYBYTES, $pass, $salt, $opslimit, $memlimit, $alg);
10    $final .= hash_hmac('sha3-256', $message, $secret_key, true);
11    $final .= $nonce = openssl_random_pseudo_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
12    $final .= sodium_crypto_secretbox($message, $nonce, $secret_key);
13    return $final;
14}
15
16function decrypt($encrypted, $pass)
17{
18    $alg = SODIUM_CRYPTO_PWHASH_ALG_DEFAULT;
19    $opslimit = SODIUM_CRYPTO_PWHASH_OPSLIMIT_INTERACTIVE;
20    $memlimit = SODIUM_CRYPTO_PWHASH_MEMLIMIT_INTERACTIVE;
21    $ls = SODIUM_CRYPTO_PWHASH_SALTBYTES;
22    $ln = SODIUM_CRYPTO_SECRETBOX_NONCEBYTES;
23    $salt = substr($encrypted, 0, $ls);
24    $secret_key = sodium_crypto_pwhash(SODIUM_CRYPTO_SECRETBOX_KEYBYTES, $pass, $salt, $opslimit, $memlimit, $alg);
25    $hmac_original = substr($encrypted, $ls, 32);
26    $nonce = substr($encrypted, $ls + 32, $ln);
27    $message = sodium_crypto_secretbox_open(substr($encrypted, $ls + 32 + $ln), $nonce, $secret_key);
28    if (!hash_equals($hmac_original, hash_hmac('sha3-256', $message, $secret_key, true)))
29        return false;
30    return $message;
31}