Online PHP editor | rfc for 97LZL

@ 2017-11-22T06:54:32Z

<?php

function aesCtr(string $m, string $n, string $k): string {
    return \openssl_encrypt($m, 'aes-256-ctr', $k, OPENSSL_RAW_DATA, $n);
}

$messages = [
    'wGVEtlgIETc4E4SNly0b7viJAv3bpO/85lC5/XCssVnMlrPc+TxeI+Jrsl+wVwQVOKbCEw8=',
    '2GxE9VRBC3giH5XMiSQXvfnGAeGHBqlXABl1mHrcabUCi8PLNlZCe+K1+3M9Vvb9nJo0AjHjuYkARV9h8WRywgFg+VSWKLb0K0lg+ZBVN70sJ+GRLrB6mCUK/ZeYucA=',
    '1mgX9w0TFzd2Ty69vfYaKmioBx7KaZoHHuCYCOEG519T2EQs6HJMIIle'
];

$key = hash('sha256', 'spottycat', true);
$nonce = str_repeat("\0", 16);

// First, remove the base64 decoding:
$base64decoded = [
    base64_decode($messages[0]),
    base64_decode($messages[1]),
    base64_decode($messages[2])
];

// The last 32 bytes are a HMAC. We can strip that.
$stripLast32 = [
    mb_substr($base64decoded[0], 0, -32, '8bit'),
    mb_substr($base64decoded[1], 0, -32, '8bit'),
    mb_substr($base64decoded[2], 0, -32, '8bit')
];

var_dump(
    bin2hex($stripLast32[0]),
    bin2hex($stripLast32[1]),
    bin2hex($stripLast32[2]),
    bin2hex(
        aesCtr($messages[0], $nonce, $key)
    ),
    bin2hex(
        aesCtr($messages[1], $nonce, $key)
    ),
    bin2hex(
        aesCtr($messages[2], $nonce, $key)
    ),
    aesCtr($messages[0], $nonce, $key),
    aesCtr($messages[1], $nonce, $key),
    aesCtr($messages[2], $nonce, $key)
);

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught Error: Call to undefined function openssl_encrypt() in /in/97LZL:4 Stack trace: #0 /in/97LZL(35): aesCtr('wGVEtlgIETc4E4S...', '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00...', 'Q\x10\xAC\xC9\x92\xCD\xE6S\x82\xAB\x9A\x0E<EX...') #1 {main} thrown in /in/97LZL on line 4
Process exited with code 255.

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