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 encrypted

ccm_decrypt_verify

  my $plaintext = ccm_decrypt_verify($cipher, $key, $nonce, $header, $ciphertext, $tag);

  # on error returns undef

SEE ALSO

• CryptX, Crypt::Mode::EAX, Crypt::Mode::GCM, Crypt::Mode::OCB

• https://en.wikipedia.org/wiki/CCM_mode