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Crypt::Digest(3)      User Contributed Perl Documentation     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

       o   CryptX(3)

       o   Crypt::Digest tries to be compatible with Digest(3) interface.

       o   Check subclasses like Crypt::Digest::SHA1(3),
           Crypt::Digest::MD5(3), ...



perl v5.30.3                      2022-01-07                  Crypt::Digest(3)

cryptx 0.76.0 - Generated Thu Feb 17 19:20:55 CST 2022
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