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Crypt::AuthEnc::CCM(3)User Contributed Perl DocumentatioCrypt::AuthEnc::CCM(3)

NAME
       Crypt::AuthEnc::CCM - Authenticated encryption in CCM mode

SYNOPSIS
	### 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);

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, $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))

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

	 # on error returns undef

SEE ALSO
       o   CryptX, Crypt::AuthEnc::EAX,	Crypt::AuthEnc::GCM,
	   Crypt::AuthEnc::OCB

       o   <https://en.wikipedia.org/wiki/CCM_mode>

perl v5.24.1			  2017-05-30		Crypt::AuthEnc::CCM(3)

NAME | SYNOPSIS | DESCRIPTION | EXPORT | FUNCTIONS | SEE ALSO

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