PHP code example of jsq / psr7-stream-encryption

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

jsq / psr7-stream-encryption example snippets

$iv = random_bytes(openssl_cipher_iv_length('aes-256-cbc'));
$cipherMethod = new Cbc($iv);
$key = 'some-secret-password-here';

$inStream = new Stream(fopen('some-input-file', 'r')); // Any PSR-7 stream will be fine here
$cipherTextStream = new AesEncryptingStream($inStream, $key, $cipherMethod); // Wrap the stream in an EncryptingStream
$cipherTextFile = Psr7\stream_for(fopen('encrypted.file', 'w'));
Psr7\copy_to_stream($cipherTextStream, $cipherTextFile); // When you read from the encrypting stream, the data will be encrypted.

// You'll also need to store the IV somewhere, because we'll need it later to decrypt the data.
// In this case, I'll base64 encode it and stick it in a file (but we could put it anywhere where we can retrieve it later, like a database column)
file_put_contents('encrypted.iv', base64_encode($iv));

$hash = null;
$ciphertext = new Jsq\EncryptionStreams\AesEncryptingStream(
    $plaintext,
    $key,
    $cipherMethod
);
$hashingDecorator = new Jsq\EncryptionStreams\HashingStream(
    $ciphertext,
    $key,
    function ($calculatedHash) use (&$hash) {
        $hash = $calculatedHash;
    }
);

while (!$ciphertext->eof()) {
    $ciphertext->read(1024 * 1024);
}

assert('$hash === $hashingDecorator->getHash()');

$key = 'secret key';
$iv = random_bytes(openssl_cipher_iv_length('aes-256-cbc'));
$plainText = 'Super secret text';
$cipherText = openssl_encrypt(
    $plainText,
    'aes-256-cbc',
    $key,
    OPENSSL_RAW_DATA
    $iv
);
$expectedHash = hash('sha256', $cipherText);

$hashingDecorator = new Jsq\EncryptingStreams\HashingStream(
    GuzzleHttp\Psr7\stream_for($cipherText),
    $key,
    function ($hash) use ($expectedHash) {
        if ($hash !== $expectedHash) {
            throw new DomainException('Cipher text mac does not match expected value!');
        }
    }
);

$decrypted = new Jsq\EncryptionStreams\AesEncryptingStream(
    $cipherText,
    $key,
    $cipherMethod
);
while (!$decrypted->eof()) {
    $decrypted->read(1024 * 1024);
}