hash_hmac_encoding_demo.php

<?php

$algo = 'sha256';
$string = 'demo123';

// Note: Enumerable.Range(0x80, 0xAF)
$ba = range(0x80, 0xAF);

// Note: String.Join
//       without bin2hex(), sign_utf8 will failed
$s = strtoupper(bin2hex(implode(array_map("chr", $ba))));

echo "s             = " . $s . "\n";

// Note: ASCIIEncoding().GetBytes
$byteArray = unpack('C*', $s);
$sAsciiEncode = implode(array_map('chr', $byteArray));
echo "sAsciiEncode  = " . $sAsciiEncode . "\n";

// Note: UTF8Encoding().GetBytes
$byteArray = unpack('C*', $s);
$sUtf8Encode = utf8_encode(implode(array_map('chr', $byteArray)));
echo "sUtf8Encode   = " . $sUtf8Encode . "\n";

// hash_hmac
$sign_original = hash_hmac($algo, $string, $s);
echo 'sign_original = ' . $sign_original . "\n";
$sign_ascii = hash_hmac($algo, $string, $sAsciiEncode);
echo 'sign_ascii    = ' . $sign_ascii . "\n";
$sign_utf8 = hash_hmac($algo, $string, $sUtf8Encode);
echo 'sign_utf8     = ' . $sign_utf8 . "\n";

// Output:
/**
s             = 808182838485868788898A8B8C8D8E8F909192939495969798999A9B9C9D9E9FA0A1A2A3A4A5A6A7A8A9AAABACADAEAF
sAsciiEncode  = 808182838485868788898A8B8C8D8E8F909192939495969798999A9B9C9D9E9FA0A1A2A3A4A5A6A7A8A9AAABACADAEAF
sUtf8Encode   = 808182838485868788898A8B8C8D8E8F909192939495969798999A9B9C9D9E9FA0A1A2A3A4A5A6A7A8A9AAABACADAEAF
sign_original = a42a51d17ec099d815b27146eb651cf230735b8dbcfc606a75956d1b8469da0b
sign_ascii    = a42a51d17ec099d815b27146eb651cf230735b8dbcfc606a75956d1b8469da0b
sign_utf8     = a42a51d17ec099d815b27146eb651cf230735b8dbcfc606a75956d1b8469da0b
/**/