165 lines
4.4 KiB
Perl
165 lines
4.4 KiB
Perl
package Crypt::AuthEnc::ChaCha20Poly1305;
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use strict;
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use warnings;
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our $VERSION = '0.048';
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use base qw(Crypt::AuthEnc Exporter);
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our %EXPORT_TAGS = ( all => [qw( chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify )] );
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our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
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our @EXPORT = qw();
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use CryptX;
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sub new { my $class = shift; _new(@_) }
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sub chacha20poly1305_encrypt_authenticate {
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my $key = shift;
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my $iv = shift;
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my $adata = shift;
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my $plaintext = shift;
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my $m = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
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$m->adata_add(defined $adata ? $adata : ''); #XXX-TODO if no aad we have to pass empty string
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my $ct = $m->encrypt_add($plaintext);
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my $tag = $m->encrypt_done;
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return ($ct, $tag);
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}
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sub chacha20poly1305_decrypt_verify {
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my $key = shift;
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my $iv = shift;
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my $adata = shift;
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my $ciphertext = shift;
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my $tag = shift;
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my $m = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
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$m->adata_add(defined $adata ? $adata : ''); #XXX-TODO if no aad we have to pass empty string
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my $ct = $m->decrypt_add($ciphertext);
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return $m->decrypt_done($tag) ? $ct : undef;
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}
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1;
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=pod
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=head1 NAME
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Crypt::AuthEnc::ChaCha20Poly1305 - Authenticated encryption in ChaCha20Poly1305 mode
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=head1 SYNOPSIS
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### OO interface
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use Crypt::AuthEnc::ChaCha20Poly1305;
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# encrypt and authenticate
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my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
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$ae->aad_add('additional_authenticated_data1');
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$ae->aad_add('additional_authenticated_data2');
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$ct = $ae->encrypt_add('data1');
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$ct = $ae->encrypt_add('data2');
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$ct = $ae->encrypt_add('data3');
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$tag = $ae->encrypt_done();
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# decrypt and verify
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my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
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$ae->aad_add('additional_authenticated_data1');
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$ae->aad_add('additional_authenticated_data2');
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$pt = $ae->decrypt_add('ciphertext1');
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$pt = $ae->decrypt_add('ciphertext2');
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$pt = $ae->decrypt_add('ciphertext3');
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$tag = $ae->decrypt_done();
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die "decrypt failed" unless $tag eq $expected_tag;
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#or
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my $result = $ae->decrypt_done($expected_tag) die "decrypt failed";
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### functional interface
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use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify);
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my ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext);
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my $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag);
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=head1 DESCRIPTION
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Provides encryption and authentication based on ChaCha20 + Poly1305 as defined in RFC 7539 - L<https://tools.ietf.org/html/rfc7539>
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=head1 EXPORT
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Nothing is exported by default.
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You can export selected functions:
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use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify);
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=head1 FUNCTIONS
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=head2 chacha20poly1305_encrypt_authenticate
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my ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext);
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# $key ..... key of proper length (128 or 256 bits / 16 or 32 bytes)
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# $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes)
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# $adata ... additional authenticated data (optional)
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=head2 chacha20poly1305_decrypt_verify
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my $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag);
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# on error returns undef
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=head1 METHODS
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=head2 new
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my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
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# $key ..... encryption key of proper length (128 or 256 bits / 16 or 32 bytes)
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# $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes)
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=head2 aad_add
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Can be called before the first C<encrypt_add> or C<decrypt_add>;
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$ae->aad_add($aad_data); #can be called multiple times
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=head2 encrypt_add
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$ciphertext = $ae->encrypt_add($data); #can be called multiple times
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=head2 encrypt_done
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$tag = $ae->encrypt_done();
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=head2 decrypt_add
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$plaintext = $ae->decrypt_add($ciphertext); #can be called multiple times
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=head2 decrypt_done
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my $result = $ae->decrypt_done($tag); # returns 1 (success) or 0 (failure)
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#or
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my $tag = $ae->decrypt_done; # returns $tag value
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=head2 clone
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my $ae_new = $ae->clone;
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=head2 set_iv
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$ae->set_iv($iv);
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=head2 set_iv_rfc7905
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$ae->set_iv_rfc7905($iv, $seqnum);
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=head1 SEE ALSO
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=over
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=item * L<CryptX|CryptX>, L<Crypt::AuthEnc::GCM|Crypt::AuthEnc::GCM>, L<Crypt::AuthEnc::CCM|Crypt::AuthEnc::CCM>, L<Crypt::AuthEnc::EAX|Crypt::AuthEnc::EAX>, L<Crypt::AuthEnc::OCB|Crypt::AuthEnc::OCB>
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=item * L<https://tools.ietf.org/html/rfc7539>
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=back
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