NAME

Encode::Base58::GMP - High speed Base58 encoding using GMP with BigInt and MD5 support

For version 1.0 upgrades, please read the INCOMPATIBLE CHANGES section below.

SYNOPSIS

  use Encode::Base58::GMP;

  # Encode Int as Base58
  encode_base58(12345);                        # => 4ER string
  encode_base58('0x3039');                     # => 4ER string
  encode_base58(Math::GMPz->new('0x3039'));    # => 4ER string

  # Encode Int as Base58 using GMP alphabet
  encode_base58(12345,'bitcoin');              # => 4fr string
  encode_base58(12345,'gmp');                  # => 3cn string

  # Decode Base58 as Math::GMPz Int
  decode_base58('4ER');                        # => 12345 Math::GMPz object
  int decode_base58('4ER');                    # => 12345 integer

  # Decode Base58 as Math::GMPz Int using GMP alphabet
  decode_base58('4fr','bitcoin');              # => 12345 Math::GMPz object
  decode_base58('3cn','gmp');                  # => 12345 Math::GMPz object

  # MD5 Base58 Digest
  md5_base58('foo@bar.com');                   # => w6fdCRXnUXyz7EtDn5TgN9

  # Convert between alphabets for Bitcoin, Flickr and GMP
  base58_from_to('123456789abcdefghijk','flickr','gmp') # => 0123456789ABCDEFGHIJ
  base58_from_to('0123456789ABCDEFGHIJ','gmp','flickr') # => 123456789abcdefghijk

  # Convert between Flickr and GMP - Deprecated
  base58_flickr_to_gmp('123456789abcdefghijk') # => 0123456789ABCDEFGHIJ
  base58_gmp_to_flickr('0123456789ABCDEFGHIJ') # => 123456789abcdefghijk

DESCRIPTION

Encode::Base58::GMP is a Base58 encoder/decoder implementation using the GNU Multiple Precision Arithmetic Library (GMP) with transcoding between Flickr, Bitcoin and GMP Base58 implementations. The Flickr alphabet is the default and used when no alphabet is provided.

Flickr Alphabet: [0-9a-zA-Z] excluding [0OIl] to improve human readability

Bitcoin Alphabet: [0-9A-Za-z] excluding [0OIl] to improve human readability

GMP Alphabet: [0-9A-Za-v]

The encode_base58, decode_base58 and md5_base58 methods support an alphabet parameter which can be set to the supported alphabets ['bitcoin', 'flickr', 'gmp'] to indicate the value to be encoded or decoded.

Requirements

This module requires GMP 4.2.0 and above. Prior versions are limited to Base36.

Perl 5.8.9 or above is required to ensure proper bigint handling. If you are not using bigint numbers, it may be possible to skip the bigint tests and do a force install; however, lower Perl versions are not supported.

FUNCTIONS

encode_base58 ( $number [, $alphabet ] )

This routine encodes a $number in Base58. $number can be a Math::GMPz object or a binary, octal, decimal or hexidecimal number. Binary, octal and hexidecimal string literals must be prefixed with 0[Bb]/0/0[Xx] respectively. The Flickr alphabet is used unless $alphabet is set to 'gmp'.

decode_base58 ( $base58 [, $alphabet ] )

This routine decodes a Base58 value and returns a Math::GMPz object. Use int on the return value to convert the Math::GMPz object to an integer. The Flickr alphabet is used unless $alphabet is set to 'gmp'.

base58_from_to( $base58, $from_alphabet, $to_alphabet )

This routine encodes a Base58 string from one encoding to another encoding. This routing is not exported by default.

base58_flickr_to_gmp( $base58_as_flickr )

This routine converts a Flickr Base58 string to a GMP Base58 string. This routine is not exported by default.

base58_gmp_to_flickr( $base58_as_gmp )

This routine converts a GMP Base58 string to a Flickr Base58 string. This routine is not exported by default.

md5_base58( $data [, $alphabet ] )

This routine returns a MD5 digest in Base58. This routine is not exported by default.

CHANGES

1.00 April 30, 2013: Add Bitcoin alphabet support.
Add zero-padding for md5_base58. This is an incompatible change from version 0.09.

INCOMPATIBLE CHANGES

1.00 April 30, 2013: md5_base58 is now zero-padded to provide a fixed-length Base58 string. Prior versions were not padding with leading zero values.

AUTHOR

John Wang <johncwang@gmail.com>, <http://johnwang.com>

COPYRIGHT AND LICENSE (The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

POD ERRORS

Hey! The above document had some coding errors, which are explained below:

Around line 199:: '=item' outside of any '=over'
Around line 206:: You forgot a '=back' before '=head1'
Around line 208:: '=item' outside of any '=over'
Around line 213:: You forgot a '=back' before '=head1'