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preparation for encrypted storage

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Chris
2018-09-19 22:38:49 +02:00
parent a75b2e3f62
commit abcc7ca654
1 changed files with 24 additions and 0 deletions
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24
classes/crypto.php Normal file
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<?php
class Crypto
{
function encrypt($inputfile,$outputfile)
{
if(!file_exists($inputfile)) return;
$data = base64_encode(file_get_contents($inputfile));
$nonce = random_bytes(SODIUM_CRYPTO_SECRETBOX_NONCEBYTES);
$ciphertext = sodium_crypto_secretbox($data, $nonce, ENCRYPTION_KEY);
$encoded = base64_encode($nonce . $ciphertext);
file_put_contents($outputfile,$encoded);
}
function decrypt($inputfile,$outputfile)
{
if(!file_exists($inputfile)) return;
$decoded = base64_decode(file_get_contents($inputfile));
$nonce = mb_substr($decoded, 0, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, '8bit');
$ciphertext = mb_substr($decoded, SODIUM_CRYPTO_SECRETBOX_NONCEBYTES, null, '8bit');
$plaintext = sodium_crypto_secretbox_open($ciphertext, $nonce, ENCRYPTION_KEY);
file_put_contents($outputfile,base64_decode($plaintext));
}
}