NAME
Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode
SYNOPSIS
use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);
my ($ciphertext, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, $header, $tag_len, $plaintext);
#### send ($ciphertext, $tag, $nonce, $header) to other party
my $plaintext = ccm_decrypt_verify('AES', $key, $nonce, $header, $ciphertext, $tag);DESCRIPTION
CCM is a encrypt+authenticate mode that is centered around using AES (or any 16-byte cipher) as aprimitive. Unlike EAX and OCB mode, it is only meant for packet mode where the length of the input is known in advance.
EXPORT
Nothing is exported by default.
You can export selected functions:
use Crypt::AuthEnc::CCM qw(ccm_encrypt_authenticate ccm_decrypt_verify);FUNCTIONS
ccm_encrypt_authenticate
my ($ciphertext, $tag) = ccm_encrypt_authenticate($cipher, $key, $nonce, $header, $tag_len, $plaintext);
# $cipher .. 'AES' or name of any other cipher with 16-byte block len
# $key ..... AES key of proper length (128/192/256bits)
# $nonce ... unique nonce/salt (no need to keep it secret)
# $header .. meta-data you want to send with the message but not have encryptedccm_decrypt_verify
my $plaintext = ccm_decrypt_verify($cipher, $key, $nonce, $header, $ciphertext, $tag);
# on error returns undef