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sodium_crypto_secretstream_xchacha20poly1305_init_push

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_secretstream_xchacha20poly1305_init_pushInitialize a secretstream context for encryption

说明

sodium_crypto_secretstream_xchacha20poly1305_init_push(string $key): array

Initialize a secretstream context for encryption.

参数

key

Cryptography key. See sodium_crypto_secretstream_xchacha20poly1305_keygen().

返回值

An array with two string values:

  • The secretstream state, needed for further pushes
  • The secretstream header, which needs to be provided to the recipient so they can pull data

范例

示例 #1 sodium_crypto_secretstream_xchacha20poly1305_init_push() example

<?php
function encrypt_file(string $inputFilePathstring $outputFilePathstring $key): void
{
    [
$state$header] = sodium_crypto_secretstream_xchacha20poly1305_init_push($key);

    
$inputFile fopen($inputFilePath'rb');
    
$outputFile fopen($outputFilePath'wb');
    
// Write the header:
    
fwrite($outputFile$header);
    
$inputFileSize fstat($inputFile)['size'];

    
// Encrypt the file and write its contents to the output file:
    
for ($i 0$i $inputFileSize$i += 8175) {
        
$ptxt_chunk fread($inputFile8175);
        
$ctxt_chunk sodium_crypto_secretstream_xchacha20poly1305_push($state$ptxt_chunk);
        
fwrite($outputFile$ctxt_chunk);
    }

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

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

file_put_contents('hello.txt''Hello world!');
encrypt_file('hello.txt''hello.txt.encrypted'$key);
var_dump(sodium_bin2hex(file_get_contents('hello.txt.encrypted')));
?>

以上例程的输出类似于:

string(106) "971e33b255f0990ef3931caf761c59136efa77b434832f28ec719e3ff73f5aec38b3bba1574ab5b70a8844d8da36a668e802cfea2c"
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