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();