1Crypt::AuthEnc::CCM(3)User Contributed Perl DocumentationCrypt::AuthEnc::CCM(3)
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6 Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode
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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, $tag);
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16 CCM is a encrypt+authenticate mode that is centered around using AES
17 (or any 16-byte cipher) as aprimitive. Unlike EAX and OCB mode, it is
18 only meant for packet mode where the length of the input is known in
19 advance.
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22 Nothing is exported by default.
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24 You can export selected functions:
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26 use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
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29 ccm_encrypt_authenticate
30 my ($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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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 v5.32.1 2021-03-30 Crypt::AuthEnc::CCM(3)