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NAME
Crypt::Digest - Generic interface to hash/digest functions
SYNOPSIS
### Functional interface:
use Crypt::Digest qw( digest_data digest_data_hex digest_data_b64 digest_data_b64u
digest_file digest_file_hex digest_file_b64 digest_file_b64u );
# calculate digest from string/buffer
$digest_raw = digest_data('SHA1', 'data string');
$digest_hex = digest_data_hex('SHA1', 'data string');
$digest_b64 = digest_data_b64('SHA1', 'data string');
$digest_b64u = digest_data_b64u('SHA1', 'data string');
# calculate digest from file
$digest_raw = digest_file('SHA1', 'filename.dat');
$digest_hex = digest_file_hex('SHA1', 'filename.dat');
$digest_b64 = digest_file_b64('SHA1', 'filename.dat');
$digest_b64u = digest_file_b64u('SHA1', 'filename.dat');
# calculate digest from filehandle
$digest_raw = digest_file('SHA1', *FILEHANDLE);
$digest_hex = digest_file_hex('SHA1', *FILEHANDLE);
$digest_b64 = digest_file_b64('SHA1', *FILEHANDLE);
$digest_b64u = digest_file_b64u('SHA1', *FILEHANDLE);
### OO interface:
use Crypt::Digest;
$d = Crypt::Digest->new('SHA1');
$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 various hash/digest algorithms.
EXPORT
Nothing is exported by default.
You can export selected functions:
use Crypt::Digest qw( digest_data digest_data_hex digest_data_b64 digest_data_b64u
digest_file digest_file_hex digest_file_b64 digest_file_b64u );
Or all of them at once:
use Crypt::Digest ':all';
FUNCTIONS
Please note that all functions take as its first argument the algorithm
name, supported values are:
'CHAES', 'MD2', 'MD4', 'MD5', 'RIPEMD128', 'RIPEMD160',
'RIPEMD256', 'RIPEMD320', 'SHA1', 'SHA224', 'SHA256',
'SHA384', 'SHA512', 'SHA512_224', 'SHA512_256', 'Tiger192', 'Whirlpool',
'SHA3_224', 'SHA3_256', 'SHA3_384', 'SHA3_512',
'BLAKE2b_160', 'BLAKE2b_256', 'BLAKE2b_384', 'BLAKE2b_512',
'BLAKE2s_128', 'BLAKE2s_160', 'BLAKE2s_224', 'BLAKE2s_256'
(simply any <NAME> for which there is Crypt::Digest::<NAME> module)
digest_data
Logically joins all arguments into a single string, and returns its SHA1
digest encoded as a binary string.
$digest_raw = digest_data('SHA1', 'data string');
#or
$digest_raw = digest_data('SHA1', 'any data', 'more data', 'even more data');
digest_data_hex
Logically joins all arguments into a single string, and returns its SHA1
digest encoded as a hexadecimal string.
$digest_hex = digest_data_hex('SHA1', 'data string');
#or
$digest_hex = digest_data_hex('SHA1', 'any data', 'more data', 'even more data');
digest_data_b64
Logically joins all arguments into a single string, and returns its SHA1
digest encoded as a Base64 string, with trailing '=' padding.
$digest_b64 = digest_data_b64('SHA1', 'data string');
#or
$digest_b64 = digest_data_b64('SHA1', 'any data', 'more data', 'even more data');
digest_data_b64u
Logically joins all arguments into a single string, and returns its SHA1
digest encoded as a Base64 URL Safe string (see RFC 4648 section 5).
$digest_b64url = digest_data_b64u('SHA1', 'data string');
#or
$digest_b64url = digest_data_b64u('SHA1', 'any data', 'more data', 'even more data');
digest_file
Reads file (defined by filename or filehandle) content, and returns its
digest encoded as a binary string.
$digest_raw = digest_file('SHA1', 'filename.dat');
#or
$digest_raw = digest_file('SHA1', *FILEHANDLE);
digest_file_hex
Reads file (defined by filename or filehandle) content, and returns its
digest encoded as a hexadecimal string.
$digest_hex = digest_file_hex('SHA1', 'filename.dat');
#or
$digest_hex = digest_file_hex('SHA1', *FILEHANDLE);
BEWARE: You have to make sure that the filehandle is in binary mode
before you pass it as argument to the addfile() method.
digest_file_b64
Reads file (defined by filename or filehandle) content, and returns its
digest encoded as a Base64 string, with trailing '=' padding.
$digest_b64 = digest_file_b64('SHA1', 'filename.dat');
#or
$digest_b64 = digest_file_b64('SHA1', *FILEHANDLE);
digest_file_b64u
Reads file (defined by filename or filehandle) content, and returns its
digest encoded as a Base64 URL Safe string (see RFC 4648 section 5).
$digest_b64url = digest_file_b64u('SHA1', 'filename.dat');
#or
$digest_b64url = digest_file_b64u('SHA1', *FILEHANDLE);
METHODS
new
Constructor, returns a reference to the digest object.
$d = Crypt::Digest->new($name);
# $name could be: 'CHAES', 'MD2', 'MD4', 'MD5', 'RIPEMD128', 'RIPEMD160',
# 'RIPEMD256', 'RIPEMD320', 'SHA1', 'SHA224', 'SHA256', 'SHA384',
# 'SHA512', 'SHA512_224', 'SHA512_256', 'Tiger192', 'Whirlpool'
#
# simply any <FUNCNAME> for which there is Crypt::Digest::<FUNCNAME> module
clone
Creates a copy of the digest object state and returns a reference to the
copy.
$d->clone();
reset
Reinitialize the digest object state and returns a reference to the
digest object.
$d->reset();
add
All arguments are appended to the message we calculate digest for. The
return value is the digest object itself.
$d->add('any data');
#or
$d->add('any data', 'more data', 'even more data');
Note that all the following cases are equivalent:
# case 1
$d->add('aa', 'bb', 'cc');
# case 2
$d->add('aa');
$d->add('bb');
$d->add('cc');
# case 3
$d->add('aabbcc');
# case 4
$d->add('aa')->add('bb')->add('cc');
addfile
The content of the file (or filehandle) is appended to the message we
calculate digest for. The return value is the digest object itself.
$d->addfile('filename.dat');
#or
$d->addfile(*FILEHANDLE);
BEWARE: You have to make sure that the filehandle is in binary mode
before you pass it as argument to the addfile() method.
add_bits
This method is available mostly for compatibility with other
Digest::SOMETHING modules on CPAN, you are very unlikely to need it. The
return value is the digest object itself.
$d->add_bits($bit_string); # e.g. $d->add_bits("111100001010");
#or
$d->add_bits($data, $nbits); # e.g. $d->add_bits("\xF0\xA0", 16);
BEWARE: It is not possible to add bits that are not a multiple of 8.
hashsize
Returns the length of calculated digest in bytes (e.g. 32 for SHA-256).
$d->hashsize;
#or
Crypt::Digest->hashsize('SHA1');
#or
Crypt::Digest::hashsize('SHA1');
digest
Returns the binary digest (raw bytes).
$result_raw = $d->digest();
hexdigest
Returns the digest encoded as a hexadecimal string.
$result_hex = $d->hexdigest();
b64digest
Returns the digest encoded as a Base64 string, with trailing '=' padding
(BEWARE: this padding style might differ from other Digest::<SOMETHING>
modules on CPAN).
$result_b64 = $d->b64digest();
b64udigest
Returns the digest encoded as a Base64 URL Safe string (see RFC 4648
section 5).
$result_b64url = $d->b64udigest();
SEE ALSO
* CryptX
* Crypt::Digest tries to be compatible with Digest interface.
* Check subclasses like Crypt::Digest::SHA1, Crypt::Digest::MD5, ...
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