^^&&^^

Edit File: EncodingTest.php

<?php
use \ParagonIE\ConstantTime\Base32;
use \ParagonIE\ConstantTime\Base32Hex;
use \ParagonIE\ConstantTime\Base64;
use \ParagonIE\ConstantTime\Base64DotSlash;
use \ParagonIE\ConstantTime\Base64DotSlashOrdered;
use \ParagonIE\ConstantTime\Base64UrlSafe;
use \ParagonIE\ConstantTime\Encoding;
use \ParagonIE\ConstantTime\Hex;

class EncodingTest extends PHPUnit\Framework\TestCase
{
    public function testBase32Encode()
    {
        $this->assertSame(
            Encoding::base32Encode("\x00"),
            'aa======'
        );
        $this->assertSame(
            Encoding::base32Encode("\x00\x00"),
            'aaaa===='
        );
        $this->assertSame(
            Encoding::base32Encode("\x00\x00\x00"),
            'aaaaa==='
        );
        $this->assertSame(
            Encoding::base32Encode("\x00\x00\x00\x00"),
            'aaaaaaa='
        );
        $this->assertSame(
            Encoding::base32Encode("\x00\x00\x00\x00\x00"),
            'aaaaaaaa'
        );
        $this->assertSame(
            Encoding::base32Encode("\x00\x00\x0F\xFF\xFF"),
            'aaaa7777'
        );
        $this->assertSame(
            Encoding::base32Encode("\xFF\xFF\xF0\x00\x00"),
            '7777aaaa'
        );

$this->assertSame(
            Encoding::base32Encode("\xce\x73\x9c\xe7\x39"),
            'zzzzzzzz'
        );
        $this->assertSame(
            Encoding::base32Encode("\xd6\xb5\xad\x6b\x5a"),
            '22222222'
        );
        $this->assertSame(
            Base32::encodeUpper("\x00"),
            'AA======'
        );
        $this->assertSame(
            Base32::encodeUpper("\x00\x00"),
            'AAAA===='
        );
        $this->assertSame(
            Base32::encodeUpper("\x00\x00\x00"),
            'AAAAA==='
        );
        $this->assertSame(
            Base32::encodeUpper("\x00\x00\x00\x00"),
            'AAAAAAA='
        );
        $this->assertSame(
            Base32::encodeUpper("\x00\x00\x00\x00\x00"),
            'AAAAAAAA'
        );
        $this->assertSame(
            Base32::encodeUpper("\x00\x00\x0F\xFF\xFF"),
            'AAAA7777'
        );
        $this->assertSame(
            Base32::encodeUpper("\xFF\xFF\xF0\x00\x00"),
            '7777AAAA'
        );

$this->assertSame(
            Base32::encodeUpper("\xce\x73\x9c\xe7\x39"),
            'ZZZZZZZZ'
        );
        $this->assertSame(
            Base32::encodeUpper("\xd6\xb5\xad\x6b\x5a"),
            '22222222'
        );
    }

public function testBase32Hex()
    {
        $this->assertSame(
            Base32Hex::encode("\x00"),
            '00======'
        );
        $this->assertSame(
            Base32Hex::encode("\x00\x00"),
            '0000===='
        );
        $this->assertSame(
            Base32Hex::encode("\x00\x00\x00"),
            '00000==='
        );
        $this->assertSame(
            Base32Hex::encode("\x00\x00\x00\x00"),
            '0000000='
        );
        $this->assertSame(
            Base32Hex::encode("\x00\x00\x00\x00\x00"),
            '00000000'
        );
        $this->assertSame(
            Base32Hex::encode("\x00\x00\x0F\xFF\xFF"),
            '0000vvvv'
        );
        $this->assertSame(
            Base32Hex::encode("\xFF\xFF\xF0\x00\x00"),
            'vvvv0000'
        );

}

/**
     * Based on test vectors from RFC 4648
     */
    public function testBase32Decode()
    {
        $this->assertSame(
            "\x00\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaaaa======')
        );
        $this->assertSame(
            "\x00\x00\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaaaaaa====')
        );
        $this->assertSame(
            "\x00\x00\x00\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaaaaaaa===')
        );
        $this->assertSame(
            "\x00\x00\x00\x00\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaaaaaaaaa=')
        );
        $this->assertSame(
            "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaaaaaaaaaa')
        );
        $this->assertSame(
            "\x00",
            Encoding::base32Decode('aa======')
        );
        $this->assertSame(
            "\x00\x00",
            Encoding::base32Decode('aaaa====')
        );
        $this->assertSame(
            "\x00\x00\x00",
            Encoding::base32Decode('aaaaa===')
        );
        $this->assertSame(
            "\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaa=')
        );
        $this->assertSame(
            "\x00\x00\x00\x00\x00",
            Encoding::base32Decode('aaaaaaaa')
        );
        $this->assertSame(
            "\x00\x00\x0F\xFF\xFF",
            Encoding::base32Decode('aaaa7777')
        );
        $this->assertSame(
            "\xFF\xFF\xF0\x00\x00",
            Encoding::base32Decode('7777aaaa')
        );
        $this->assertSame(
            "\xce\x73\x9c\xe7\x39",
            Encoding::base32Decode('zzzzzzzz')
        );
        $this->assertSame(
            "\xd6\xb5\xad\x6b\x5a",
            Encoding::base32Decode('22222222')
        );
        $this->assertSame(
            'foobar',
            Encoding::base32Decode('mzxw6ytboi======')
        );

$rand = random_bytes(9);
        $enc = Encoding::base32Encode($rand);

$this->assertSame(
            Encoding::base32Encode($rand),
            Encoding::base32Encode(Encoding::base32Decode($enc))
        );
        $this->assertSame(
            $rand,
            Encoding::base32Decode($enc)
        );
    }

/**
     * @covers Encoding::hexDecode()
     * @covers Encoding::hexEncode()
     * @covers Encoding::base32Decode()
     * @covers Encoding::base32Encode()
     * @covers Encoding::base64Decode()
     * @covers Encoding::base64Encode()
     * @covers Encoding::base64DotSlashDecode()
     * @covers Encoding::base64DotSlashEncode()
     * @covers Encoding::base64DotSlashOrderedDecode()
     * @covers Encoding::base64DotSlashOrderedEncode()
     */
    public function testBasicEncoding()
    {
        // Re-run the test at least 3 times for each length
        for ($j = 0; $j < 3; ++$j) {
            for ($i = 1; $i < 84; ++$i) {
                $rand = random_bytes($i);
                $enc = Encoding::hexEncode($rand);
                $this->assertSame(
                    \bin2hex($rand),
                    $enc,
                    "Hex Encoding - Length: " . $i
                );
                $this->assertSame(
                    $rand,
                    Encoding::hexDecode($enc),
                    "Hex Encoding - Length: " . $i
                );

// Uppercase variant:
                $enc = Hex::encodeUpper($rand);
                $this->assertSame(
                    \strtoupper(\bin2hex($rand)),
                    $enc,
                    "Hex Encoding - Length: " . $i
                );
                $this->assertSame(
                    $rand,
                    Hex::decode($enc),
                    "HexUpper Encoding - Length: " . $i
                );

$enc = Encoding::base32Encode($rand);
                $this->assertSame(
                    $rand,
                    Encoding::base32Decode($enc),
                    "Base32 Encoding - Length: " . $i
                );

$enc = Encoding::base32EncodeUpper($rand);
                $this->assertSame(
                    $rand,
                    Encoding::base32DecodeUpper($enc),
                    "Base32Upper Encoding - Length: " . $i
                );

$enc = Encoding::base32HexEncode($rand);
                $this->assertSame(
                    bin2hex($rand),
                    bin2hex(Encoding::base32HexDecode($enc)),
                    "Base32Hex Encoding - Length: " . $i
                );

$enc = Encoding::base32HexEncodeUpper($rand);
                $this->assertSame(
                    bin2hex($rand),
                    bin2hex(Encoding::base32HexDecodeUpper($enc)),
                    "Base32HexUpper Encoding - Length: " . $i
                );

$enc = Encoding::base64Encode($rand);
                $this->assertSame(
                    $rand,
                    Encoding::base64Decode($enc),
                    "Base64 Encoding - Length: " . $i
                );

$enc = Encoding::base64EncodeDotSlash($rand);
                $this->assertSame(
                    $rand,
                    Encoding::base64DecodeDotSlash($enc),
                    "Base64 DotSlash Encoding - Length: " . $i
                );
                $enc = Encoding::base64EncodeDotSlashOrdered($rand);
                $this->assertSame(
                    $rand,
                    Encoding::base64DecodeDotSlashOrdered($enc),
                    "Base64 Ordered DotSlash Encoding - Length: " . $i
                );

$enc = Base64UrlSafe::encode($rand);
                $this->assertSame(
                    \strtr(\base64_encode($rand), '+/', '-_'),
                    $enc
                );
                $this->assertSame(
                    $rand,
                    Base64UrlSafe::decode($enc)
                );
            }
        }
    }
}