Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode
### functional interface use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify); my ($ciphertext, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, $adata, $tag_len, $plaintext); my $plaintext = ccm_decrypt_verify('AES', $key, $nonce, $adata, $ciphertext, $tag);
CCM is a encrypt+authenticate mode that is centered around using AES (or any 16-byte cipher) as aprimitive. Unlike EAX and OCB mode, it is only meant for packet mode where the length of the input is known in advance.
Nothing is exported by default.
You can export selected functions:
use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
my ($ciphertext, $tag) = ccm_encrypt_authenticate($cipher, $key, $nonce, $adata, $tag_len, $plaintext); # $cipher .. 'AES' or name of any other cipher with 16-byte block len # $key ..... key of proper length (e.g. 128/192/256bits for AES) # $nonce ... unique nonce/salt (no need to keep it secret) # $adata ... additional authenticated data # $tag_len . required length of output tag
CCM parameters should follow http://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38c.pdf
# tag length: 4, 6, 8, 10, 12, 14, 16 (reasonable minimum is 8) # nonce length: 7, 8, 9, 10, 11, 12, 13 (if you are not sure, use 11) # BEWARE nonce length determines max. enc/dec data size: max_data_size = 2^(8*(15-nonce_len))
my $plaintext = ccm_decrypt_verify($cipher, $key, $nonce, $adata, $ciphertext, $tag); # on error returns undef
CryptX, Crypt::AuthEnc::EAX, Crypt::AuthEnc::GCM, Crypt::AuthEnc::OCB
https://en.wikipedia.org/wiki/CCM_mode
To install CryptX, copy and paste the appropriate command in to your terminal.
cpanm
cpanm CryptX
CPAN shell
perl -MCPAN -e shell install CryptX
For more information on module installation, please visit the detailed CPAN module installation guide.