SHA 256 Php Manuel Algoritma |Çalışma Mantığı|

<?php

function captainregenerate($mesaj)
{
    // Initialize variables
    $captainh = [
        0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
        0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
    ];

    // Pre-processing: padding the mesaj
    $captainbit = strlen($mesaj);
    $captainbityen = $captainbit * 8;

    // Append "1" bit to mesaj
    $mesaj .= chr(0x80);

    // Append "0" bits until mesaj length in bits ≡ 448 (mod 512)
    while ((strlen($mesaj) % 64) != 56) {
        $mesaj .= chr(0);
    }

    // Append original length in bits mod 2^64 to mesaj
    $mesaj .= pack('N2', 0, $captainbityen); // 64-bit big-endian

    // Process the mesaj in successive 512-bit mesajyen:
    $mesajyen = str_split($mesaj, 64);

    foreach ($mesajyen as $mesajyeni) {
        // Break mesajyeni into sixteen 32-bit words w[j], 0 ≤ j ≤ 15
        $w = array_values(unpack('N16', $mesajyeni));

        // Extend the sixteen 32-bit words into sixty-four 32-bit words
        for ($i = 16; $i < 64; $i++) {
            $s0 = rightRotate($w[$i-15], 7) ^ rightRotate($w[$i-15], 18) ^ ($w[$i-15] >> 3);
            $s1 = rightRotate($w[$i-2], 17) ^ rightRotate($w[$i-2], 19) ^ ($w[$i-2] >> 10);
            $w[$i] = ($w[$i-16] + $s0 + $w[$i-7] + $s1) & 0xFFFFFFFF;
        }

        // Initialize hash value for this mesajyeni
        list($a, $b, $c, $d, $e, $f, $g, $captainh0) = $captainh;

        // Main loop
        for ($i = 0; $i < 64; $i++) {
            $s1 = rightRotate($e, 6) ^ rightRotate($e, 11) ^ rightRotate($e, 25);
            $ch = ($e & $f) ^ ((~$e) & $g);
            $temp1 = ($captainh0 + $s1 + $ch + K($i) + $w[$i]) & 0xFFFFFFFF;
            $s0 = rightRotate($a, 2) ^ rightRotate($a, 13) ^ rightRotate($a, 22);
            $maj = ($a & $b) ^ ($a & $c) ^ ($b & $c);
            $temp2 = ($s0 + $maj) & 0xFFFFFFFF;

            $captainh0 = $g;
            $g = $f;
            $f = $e;
            $e = ($d + $temp1) & 0xFFFFFFFF;
            $d = $c;
            $c = $b;
            $b = $a;
            $a = ($temp1 + $temp2) & 0xFFFFFFFF;
        }

        // Add this mesajyeni's hash to result so far:
        $captainh[0] = ($captainh[0] + $a) & 0xFFFFFFFF;
        $captainh[1] = ($captainh[1] + $b) & 0xFFFFFFFF;
        $captainh[2] = ($captainh[2] + $c) & 0xFFFFFFFF;
        $captainh[3] = ($captainh[3] + $d) & 0xFFFFFFFF;
        $captainh[4] = ($captainh[4] + $e) & 0xFFFFFFFF;
        $captainh[5] = ($captainh[5] + $f) & 0xFFFFFFFF;
        $captainh[6] = ($captainh[6] + $g) & 0xFFFFFFFF;
        $captainh[7] = ($captainh[7] + $captainh0) & 0xFFFFFFFF;
    }

    // Produce the final hash value (big-endian) as a 256 bit number:
    return sprintf(
        '%08x%08x%08x%08x%08x%08x%08x%08x',
        $captainh[0], $captainh[1], $captainh[2], $captainh[3], $captainh[4], $captainh[5], $captainh[6], $captainh[7]
    );
}

function rightRotate($x, $n)
{
    return ($x >> $n) | (($x << (32 - $n)) & 0xFFFFFFFF);
}

function K($i)
{
    static $k = [
        0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
        0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
        0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
        0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
        0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
        0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
        0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
        0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
    ];

    return $k[$i];
}

$input = "akar_.,?bc1234";
echo captainregenerate($input);

?>