文件报告的SHA-1 base32返回字符串

Question

I'm having troubles figuring out how to implement a program that I can generate a base32 sha-1 value of a file. I know it can't be too difficult to figure out as to generate a standard sha1 file is fairly easy.

$file1 = sha1_file('main.jpg');

Any help would be appreciated.

Answer 1

If you want to encode the SHA1 value as Base32, you gonna have to either write that yourself or find a library. PHP does not have it built-in, like it does with base64_encode .

A while ago, I needed a base32_encode function, so I wrote one. I don't know how efficient it is, and I'm sure better ones exist out there, but it does work. It's located here: https://github.com/NTICompass/PHP-Base32

Using that you can do:

<?php
include 'Base32.php';

$base32 = new Base32;

$file1 = sha1_file('main.jpg');
echo $base32->base32_encode($file1);

Answer 2

I have a PHP class, Base2n , which can encode Base32 per RFC 4648. It's actually more flexible than that, allowing you to parametrically define many standard and non-standard encoding schemes with a 2 ⁿ base.

https://github.com/ademarre/binary-to-text-php

Base32 is demonstrated in the first example of the README file.

Here's what your "main.jpg" example would look like:

// include, require, or autoload Base2n

$file1 = sha1_file('main.jpg', TRUE);

$base32 = new Base2n(5, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567', FALSE, TRUE, TRUE);
$base32FileHash = $base32->encode($file1);

Notice that I also set $raw_output=TRUE in the call to sha1_file() . I assume this is what you want because otherwise the Base32 output would be done on the hexadecimal representation of the SHA-1 hash digest, not the raw 160-bit digest itself.