Crypt::MagicSignatures::Envelope - MagicEnvelopes for the Salmon Protocol
use Crypt::MagicSignatures::Key; use Crypt::MagicSignatures::Envelope; # Create a new MagicKey for signing messages my $mkey = Crypt::MagicSignatures::Key->new(size => 1024); # Fold a new envelope my $me = Crypt::MagicSignatures::Envelope->new( data => 'Some arbitrary string.' ); # Sign magic envelope $me->sign($mkey); # Extract the public key my $mkey_public = $mkey->to_string; # Verify the signature of the envelope if ($me->verify($mkey_public)) { print 'Signature is verified!'; };
Crypt::MagicSignatures::Envelope implements MagicEnvelopes with MagicSignatures as described in the MagicSignatures Specification to sign messages of the Salmon Protocol. MagicSignatures is a "robust mechanism for digitally signing nearly arbitrary messages".
This module is an early release! There may be significant changes in the future.
my $alg = $me->alg;
The algorithm used for signing the MagicEnvelope. Defaults to RSA-SHA256, which is the only supported algorithm.
RSA-SHA256
my $data = $me->data; $me->data('Hello world!');
The decoded data folded in the MagicEnvelope.
my $data_type = $me->data_type; $me->data_type('text/plain');
The Mime type of the data folded in the MagicEnvelope. Defaults to text/plain.
text/plain
# Fold an xml message my $me = Crypt::MagicSignatures::Envelope->new( data => <<'XML' ); <?xml version='1.0' encoding='UTF-8'?> <entry xmlns='http://www.w3.org/2005/Atom'> <author><uri>alice@example.com</uri></author> </entry> XML # Define an xml mime type $me->data_type('application/atom+xml'); print $me->dom->at('author > uri')->text; # alice@example.com
The Mojo::DOM object of the decoded data, in the case the MagicEnvelope contains XML.
This attribute is experimental and may change without warnings!
my $encoding = $me->encoding;
The encoding of the MagicEnvelope. Defaults to base64url, which is the only encoding supported.
base64url
my $sig = $me->signature; my $sig = $me->signature('key-01');
A signature of the MagicEnvelope. For retrieving a specific signature, pass a key id, otherwise a default signature will be returned.
If a matching signature is found, the signature is returned as a hash reference, containing base64url encoded data for value and possibly a key_id. If no matching signature is found, a false value is returned.
value
key_id
false
my $base = $me->signature_base;
The signature base string of the MagicEnvelope.
# With key id if ($me->signed('key-01')) { print 'MagicEnvelope is signed with key-01.'; } # Without key id elsif ($me->signed) { print 'MagicEnvelope is signed.'; } else { print 'MagicEnvelope is not signed.'; };
Returns a true value in case the MagicEnvelope is signed at least once. Accepts optionally a key_id and returns a true value, if the MagicEnvelope was signed with this specific key.
true
$me = Crypt::MagicSignatures::Envelope->new(<<'MEXML'); <?xml version="1.0" encoding="UTF-8"?> <me:env xmlns:me="http://salmon-protocol.org/ns/magic-env"> <me:data type="text/plain"> U29tZSBhcmJpdHJhcnkgc3RyaW5nLg== </me:data> <me:encoding>base64url</me:encoding> <me:alg>RSA-SHA256</me:alg> <me:sig key_id="my-01"> S1VqYVlIWFpuRGVTX3l4S09CcWdjRVFDYVluZkI5Ulh4dmRFSnFhQW5XUmpB UEJqZUM0b0lReER4d0IwWGVQZDhzWHAxN3oybWhpTk1vNHViNGNVOVE9PQ== </me:sig> </me:env> MEXML
The constructor accepts MagicEnvelope data in various formats. It accepts MagicEnvelopes in the XML format or an XML document including a MagicEnvelope provenance element.
Additionally it accepts MagicEnvelopes in the JSON notation or defined by the same attributes as the JSON notation (but with the data not encoded). The latter is the common way to fold new envelopes.
$me = Crypt::MagicSignatures::Envelope->new(<<'MEJSON'); { "data_type": "text\/plain", "data":"U29tZSBhcmJpdHJhcnkgc3RyaW5nLg==", "alg":"RSA-SHA256", "encoding":"base64url", "sigs": [ { "key_id": "my-01", "value":"S1VqYVlIWFpuRGVTX3l4S09CcWdjRV..." } ] } MEJSON $me = Crypt::MagicSignatures::Envelope->new( data => 'Some arbitrary string.', data_type => 'text/plain', alg => 'RSA-SHA256', encoding => 'base64url', sigs => [ { key_id => 'my-01', value => 'S1VqYVlIWFpuRGVTX3l4S09CcWdjRV...' } ] );
Finally the constructor accepts MagicEnvelopes in the compact notation.
$me = Crypt::MagicSignatures::Envelope->new(<<'MECOMPACT'); bXktMDE=.S1VqYVlIWFpuRGVTX3l4S09CcWdjRVFDYVlu ZkI5Ulh4dmRFSnFhQW5XUmpBUEJqZUM0b0lReER4d0IwW GVQZDhzWHAxN3oybWhpTk1vNHViNGNVOVE9PQ==.U29tZ SBhcmJpdHJhcnkgc3RyaW5nLg.dGV4dC9wbGFpbg.YmFz ZTY0dXJs.UlNBLVNIQTI1Ng MECOMPACT
$me->sign('key-01' => 'RSA.hgfrhvb ...') ->sign('RSA.hgfrhvb ...') ->sign('RSA.hgfrhvb ...', -data) ->sign('key-02' => 'RSA.hgfrhvb ...', -data); my $mkey = Crypt::MagicSignatures::Key->new('RSA.hgfrhvb ...'); $me->sign($mkey);
Adds a signature to the MagicEnvelope.
For adding a signature, the private key with an optional prepended key id has to be given. The private key can be a Crypt::MagicSignatures::Key object, a MagicKey in compact notation or a hash reference containing the non-generation parameters accepted by the Crypt::MagicSignatures::Key constructor. Optionally a flag -data can be passed, that will sign the data payload instead of the signature base string (this is implemented for compatibility with non-standard implementations).
-data
On success, the method returns the MagicEnvelope, otherwise it returns a false value.
A MagicEnvelope can be signed multiple times.
This method is experimental and may change without warnings!
my $mkey = Crypt::MagicSignatures::Key->new( 'RSA.hgfrhvb ...' ); $me->verify( 'RSA.vsd...', $mkey, ['key-01' => 'RSA.hgfrhvb...', -data] );
Verifies a signed envelope against a bunch of given public MagicKeys. Returns a true value on success, otherwise false. If one key succeeds, the envelope is verified.
An element can be a Crypt::MagicSignatures::Key object, a MagicKey in compact notation or a hash reference containing the non-generation parameters accepted by the Crypt::MagicSignatures::Key constructor.
For referring to a certain key, an array reference can be passed, containing the key (defined as described above) with an optional prepended key id and an optional flag appended, referring to the data to be verified. Conforming with the specification the default value is -base, referring to the signature base string of the MagicEnvelope. -data will verify against the data only, -compatible will first try to verify against the base signature string and then will verify against the data on failure (this is implemented for compatibility with non-standard implementations).
-base
-compatible
my $compact_string = $me->to_compact;
Returns the MagicEnvelope in compact notation.
my $json_string = $me->to_json;
Returns the MagicEnvelope as a stringified JSON representation.
my $xml_string = $me->to_xml; my $xml_provenance_string = $me->to_xml(1);
Returns the MagicEnvelope as a stringified xml representation. If a true value is passed, a provenance fragment will be returned instead of a valid xml document.
Crypt::MagicSignatures::Key, Mojolicious. For speed improvements, see the recommendations in Crypt::MagicSignatures::Key.
The signing and verification is not guaranteed to be compatible with other implementations! Implementations like StatusNet (Identi.ca), MiniMe, and examples from the reference implementation are tested.
See the test suite for further information.
https://github.com/Akron/Crypt-MagicSignatures-Envelope
Copyright (C) 2012-2014, Nils Diewald.
This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.
To install Crypt::MagicSignatures::Envelope, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Crypt::MagicSignatures::Envelope
CPAN shell
perl -MCPAN -e shell install Crypt::MagicSignatures::Envelope
For more information on module installation, please visit the detailed CPAN module installation guide.