101 lines
2.9 KiB
Perl
101 lines
2.9 KiB
Perl
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package Crypt::AuthEnc::CCM;
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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( ccm_encrypt_authenticate ccm_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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use Crypt::Cipher;
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### the following functions are implemented in XS:
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# - _memory_encrypt
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# - _memory_decrypt
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sub ccm_encrypt_authenticate {
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my $cipher_name = shift;
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my $key = shift;
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my $nonce = shift;
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my $adata = shift;
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my $tag_len = shift;
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my $plaintext = shift;
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return _memory_encrypt(Crypt::Cipher::_trans_cipher_name($cipher_name), $key, $nonce, $adata, $tag_len, $plaintext);
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}
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sub ccm_decrypt_verify {
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my $cipher_name = shift;
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my $key = shift;
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my $nonce = shift;
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my $adata = shift;
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my $ciphertext = shift;
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my $tag = shift;
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return _memory_decrypt(Crypt::Cipher::_trans_cipher_name($cipher_name), $key, $nonce, $adata, $ciphertext, $tag);
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}
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1;
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=pod
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=head1 NAME
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Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode
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=head1 SYNOPSIS
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### functional interface
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use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
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my ($ciphertext, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, $adata, $tag_len, $plaintext);
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my $plaintext = ccm_decrypt_verify('AES', $key, $nonce, $adata, $ciphertext, $tag);
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=head1 DESCRIPTION
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CCM is a encrypt+authenticate mode that is centered around using AES (or any 16-byte cipher) as aprimitive.
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Unlike EAX and OCB mode, it is only meant for packet mode where the length of the input is known in advance.
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=head1 EXPORT
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Nothing is exported by default.
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You can export selected functions:
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use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
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=head1 FUNCTIONS
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=head2 ccm_encrypt_authenticate
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my ($ciphertext, $tag) = ccm_encrypt_authenticate($cipher, $key, $nonce, $adata, $tag_len, $plaintext);
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# $cipher .. 'AES' or name of any other cipher with 16-byte block len
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# $key ..... key of proper length (e.g. 128/192/256bits for AES)
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# $nonce ... unique nonce/salt (no need to keep it secret)
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# $adata ... additional authenticated data
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# $tag_len . required length of output tag
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CCM parameters should follow L<http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38c.pdf>
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# tag length: 4, 6, 8, 10, 12, 14, 16 (reasonable minimum is 8)
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# nonce length: 7, 8, 9, 10, 11, 12, 13 (if you are not sure, use 11)
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# BEWARE nonce length determines max. enc/dec data size: max_data_size = 2^(8*(15-nonce_len))
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=head2 ccm_decrypt_verify
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my $plaintext = ccm_decrypt_verify($cipher, $key, $nonce, $adata, $ciphertext, $tag);
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# on error returns undef
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=head1 SEE ALSO
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=over
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=item * L<CryptX|CryptX>, L<Crypt::AuthEnc::EAX|Crypt::AuthEnc::EAX>, L<Crypt::AuthEnc::GCM|Crypt::AuthEnc::GCM>, L<Crypt::AuthEnc::OCB|Crypt::AuthEnc::OCB>
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=item * L<https://en.wikipedia.org/wiki/CCM_mode|https://en.wikipedia.org/wiki/CCM_mode>
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=back
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