1Crypt::AuthEnc::CCM(3)User Contributed Perl DocumentationCrypt::AuthEnc::CCM(3)
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NAME

6       Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode
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SYNOPSIS

9        ### functional interface
10        use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
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12        my ($ciphertext, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, $adata, $tag_len, $plaintext);
13        my $plaintext = ccm_decrypt_verify('AES', $key, $nonce, $adata, $ciphertext, $tag);
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DESCRIPTION

16       CCM is a encrypt+authenticate mode that is centered around using AES
17       (or any 16-byte cipher) as aprimitive.  Unlike EAX and OCB mode, it is
18       only meant for packet mode where the length of the input is known in
19       advance.
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EXPORT

22       Nothing is exported by default.
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24       You can export selected functions:
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26         use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
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FUNCTIONS

29   ccm_encrypt_authenticate
30        my ($ciphertext, $tag) = ccm_encrypt_authenticate($cipher, $key, $nonce, $adata, $tag_len, $plaintext);
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32        # $cipher .. 'AES' or name of any other cipher with 16-byte block len
33        # $key ..... key of proper length (e.g. 128/192/256bits for AES)
34        # $nonce ... unique nonce/salt (no need to keep it secret)
35        # $adata ... additional authenticated data
36        # $tag_len . required length of output tag
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38       CCM parameters should follow
39       <http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38c.pdf>
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41        # tag length:   4, 6, 8, 10, 12, 14, 16 (reasonable minimum is 8)
42        # nonce length: 7, 8, 9, 10, 11, 12, 13 (if you are not sure, use 11)
43        # BEWARE nonce length determines max. enc/dec data size: max_data_size = 2^(8*(15-nonce_len))
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45   ccm_decrypt_verify
46         my $plaintext = ccm_decrypt_verify($cipher, $key, $nonce, $adata, $ciphertext, $tag);
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48         # on error returns undef
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SEE ALSO

51       ·   CryptX, Crypt::AuthEnc::EAX, Crypt::AuthEnc::GCM,
52           Crypt::AuthEnc::OCB
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54       ·   <https://en.wikipedia.org/wiki/CCM_mode>
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58perl v5.28.1                      2017-09-15            Crypt::AuthEnc::CCM(3)
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