Crypt::Digest(3)

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, ...