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sodium_crypto_secretstream_xchacha20poly1305_init_pull

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_secretstream_xchacha20poly1305_init_pullInitialize a secretstream context for decryption

Descripción

sodium_crypto_secretstream_xchacha20poly1305_init_pull(string $header, string $key): string

Initialize a secretstream context for decryption.

Parámetros

header

The header of the secretstream. This should be one of the values produced by sodium_crypto_secretstream_xchacha20poly1305_init_push().

key

Encryption key (256-bit).

Valores devueltos

Secretstream state.

Ejemplos

Ejemplo #1 sodium_crypto_secretstream_xchacha20poly1305_init_pull() example

<?php
function decrypt_file(string $inputFilePath, string $outputFilePath, string $key): void
{
$inputFile = fopen($inputFilePath, 'rb');
$outputFile = fopen($outputFilePath, 'wb');
$header = fread($inputFile, 24);

$state = sodium_crypto_secretstream_xchacha20poly1305_init_pull($header, $key);
$inputFileSize = fstat($inputFile)['size'];

// Decrypt the file and write its contents to the output file:
for ($i = 24; $i < $inputFileSize; $i += 8192) {
$ctxt_chunk = fread($inputFile, 8192);

// We're not using $tag, but in real protocols you can use this on encrypt to e.g.
// trigger a re-key or indicate the end of file. Then, on decrypt, you can assert
// this behavior.
[$ptxt_chunk, $tag] = sodium_crypto_secretstream_xchacha20poly1305_pull($state, $ctxt_chunk);
fwrite($outputFile, $ptxt_chunk);
}

sodium_memzero($state);
fclose($inputFile);
fclose($outputFile);
}

// sodium_crypto_secretstream_xchacha20poly1305_keygen()
$key = sodium_base642bin('MS0lzb7HC+thY6jY01pkTE/cwsQxnRq0/2L1eL4Hxn8=', SODIUM_BASE64_VARIANT_ORIGINAL);

$example = sodium_hex2bin('971e33b255f0990ef3931caf761c59136efa77b434832f28ec719e3ff73f5aec38b3bba1574ab5b70a8844d8da36a668e802cfea2c');
file_put_contents('hello.enc', $example);
decrypt_file('hello.enc', 'hello.txt.decrypted', $key);
var_dump(file_get_contents('hello.txt.decrypted'));
?>

El resultado del ejemplo sería algo similar a:

string(12) "Hello world!"
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