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 asCrypt::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;#orCrypt::Digest::SHA256->hashsize();#orCrypt::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