NAME

       Crypt::Digest::SHA256 - Hash function SHA-256 [size: 256 bits]

SYNOPSIS

          ### Functional interface:
          use Crypt::Digest::SHA256 qw( sha256 sha256_hex sha256_b64 sha256_b64u
                                       sha256_file sha256_file_hex sha256_file_b64 sha256_file_b64u );

          # calculate digest from string/buffer
          $sha256_raw  = sha256('data string');
          $sha256_hex  = sha256_hex('data string');
          $sha256_b64  = sha256_b64('data string');
          $sha256_b64u = sha256_b64u('data string');
          # calculate digest from file
          $sha256_raw  = sha256_file('filename.dat');
          $sha256_hex  = sha256_file_hex('filename.dat');
          $sha256_b64  = sha256_file_b64('filename.dat');
          $sha256_b64u = sha256_file_b64u('filename.dat');
          # calculate digest from filehandle
          $sha256_raw  = sha256_file(*FILEHANDLE);
          $sha256_hex  = sha256_file_hex(*FILEHANDLE);
          $sha256_b64  = sha256_file_b64(*FILEHANDLE);
          $sha256_b64u = sha256_file_b64u(*FILEHANDLE);

          ### OO interface:
          use Crypt::Digest::SHA256;

          $d = Crypt::Digest::SHA256->new;
          $d->add('any data');
          $d->addfile('filename.dat');
          $d->addfile(*FILEHANDLE);
          $result_raw  = $d->digest;     # raw bytes
          $result_hex  = $d->hexdigest;  # hexadecimal form
          $result_b64  = $d->b64digest;  # Base64 form
          $result_b64u = $d->b64udigest; # Base64 URL Safe form

DESCRIPTION

       Provides an interface to the SHA256 digest algorithm.

EXPORT

       Nothing is exported by default.

       You can export selected functions:

         use Crypt::Digest::SHA256 qw(sha256 sha256_hex sha256_b64 sha256_b64u
                                             sha256_file sha256_file_hex sha256_file_b64 sha256_file_b64u);

       Or all of them at once:

         use Crypt::Digest::SHA256 ':all';

FUNCTIONS

   sha256
       Logically joins all arguments into a single string, and returns its SHA256 digest encoded
       as a binary string.

        $sha256_raw = sha256('data string');
        #or
        $sha256_raw = sha256('any data', 'more data', 'even more data');

   sha256_hex
       Logically joins all arguments into a single string, and returns its SHA256 digest encoded
       as a hexadecimal string.

        $sha256_hex = sha256_hex('data string');
        #or
        $sha256_hex = sha256_hex('any data', 'more data', 'even more data');

   sha256_b64
       Logically joins all arguments into a single string, and returns its SHA256 digest encoded
       as a Base64 string, with trailing '=' padding.

        $sha256_b64 = sha256_b64('data string');
        #or
        $sha256_b64 = sha256_b64('any data', 'more data', 'even more data');

   sha256_b64u
       Logically joins all arguments into a single string, and returns its SHA256 digest encoded
       as a Base64 URL Safe string (see RFC 4648 section 5).

        $sha256_b64url = sha256_b64u('data string');
        #or
        $sha256_b64url = sha256_b64u('any data', 'more data', 'even more data');

   sha256_file
       Reads file (defined by filename or filehandle) content, and returns its SHA256 digest
       encoded as a binary string.

        $sha256_raw = sha256_file('filename.dat');
        #or
        $sha256_raw = sha256_file(*FILEHANDLE);

   sha256_file_hex
       Reads file (defined by filename or filehandle) content, and returns its SHA256 digest
       encoded as a hexadecimal string.

        $sha256_hex = sha256_file_hex('filename.dat');
        #or
        $sha256_hex = sha256_file_hex(*FILEHANDLE);

       BEWARE: You have to make sure that the filehandle is in binary mode before you pass it as
       argument to the addfile() method.

   sha256_file_b64
       Reads file (defined by filename or filehandle) content, and returns its SHA256 digest
       encoded as a Base64 string, with trailing '=' padding.

        $sha256_b64 = sha256_file_b64('filename.dat');
        #or
        $sha256_b64 = sha256_file_b64(*FILEHANDLE);

   sha256_file_b64u
       Reads file (defined by filename or filehandle) content, and returns its SHA256 digest
       encoded as a Base64 URL Safe string (see RFC 4648 section 5).

        $sha256_b64url = sha256_file_b64u('filename.dat');
        #or
        $sha256_b64url = sha256_file_b64u(*FILEHANDLE);

METHODS

       The OO interface provides the same set of functions as Crypt::Digest.

   new
        $d = Crypt::Digest::SHA256->new();

   clone
        $d->clone();

   reset
        $d->reset();

   add
        $d->add('any data');
        #or
        $d->add('any data', 'more data', 'even more data');

   addfile
        $d->addfile('filename.dat');
        #or
        $d->addfile(*FILEHANDLE);

   add_bits
        $d->add_bits($bit_string);   # e.g. $d->add_bits("111100001010");
        #or
        $d->add_bits($data, $nbits); # e.g. $d->add_bits("\xF0\xA0", 16);

   hashsize
        $d->hashsize;
        #or
        Crypt::Digest::SHA256->hashsize();
        #or
        Crypt::Digest::SHA256::hashsize();

   digest
        $result_raw = $d->digest();

   hexdigest
        $result_hex = $d->hexdigest();

   b64digest
        $result_b64 = $d->b64digest();

   b64udigest
        $result_b64url = $d->b64udigest();

SEE ALSO

       •   CryptX, Crypt::Digest

       •   <https://en.wikipedia.org/wiki/SHA-2>