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

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

SYNOPSIS
	### OO interface
	use Crypt::AuthEnc::EAX;

	# encrypt and authenticate
	my $ae = Crypt::AuthEnc::EAX->new("AES", $key, $iv);
	$ae->aad_add('additional_authenticated_data1');
	$ae->aad_add('additional_authenticated_data2');
	$ct = $ae->encrypt_add('data1');
	$ct = $ae->encrypt_add('data2');
	$ct = $ae->encrypt_add('data3');
	$tag = $ae->encrypt_done();

	# decrypt and verify
	my $ae = Crypt::AuthEnc::EAX->new("AES", $key, $iv);
	$ae->aad_add('additional_authenticated_data1');
	$ae->aad_add('additional_authenticated_data2');
	$pt = $ae->decrypt_add('ciphertext1');
	$pt = $ae->decrypt_add('ciphertext2');
	$pt = $ae->decrypt_add('ciphertext3');
	$tag = $ae->decrypt_done();
	die "decrypt failed" unless $tag eq $expected_tag;

	#or
	my $result = $ae->decrypt_done($expected_tag) die "decrypt failed";

	### functional interface
	use Crypt::AuthEnc::EAX	qw(eax_encrypt_authenticate eax_decrypt_verify);

	my ($ciphertext, $tag) = eax_encrypt_authenticate('AES', $key, $iv, $adata, $plaintext);
	my $plaintext =	eax_decrypt_verify('AES', $key,	$iv, $adata, $ciphertext, $tag);

DESCRIPTION
       EAX is a	mode that requires a cipher, CTR and OMAC support and provides
       encryption and authentication.  It is initialized with a	random IV that
       can be shared publicly, additional authenticated	data which can be
       fixed and public, and a random secret symmetric key.

EXPORT
       Nothing is exported by default.

       You can export selected functions:

	 use Crypt::AuthEnc::EAX qw(eax_encrypt_authenticate eax_decrypt_verify);

FUNCTIONS
   eax_encrypt_authenticate
	my ($ciphertext, $tag) = eax_encrypt_authenticate($cipher, $key, $iv, $adata, $plaintext);

	# $cipher .. 'AES' or name of any other	cipher with 16-byte block len
	# $key ..... AES key of	proper length (128/192/256bits)
	# $iv ...... unique initialization vector (no need to keep it secret)
	# $adata ... additional	authenticated data

   eax_decrypt_verify
	 my $plaintext = eax_decrypt_verify($cipher, $key, $iv,	$adata,	$ciphertext, $tag);

	 # on error returns undef

METHODS
   new
	my $ae = Crypt::AuthEnc::EAX->new($cipher, $key, $iv);
	#or
	my $ae = Crypt::AuthEnc::EAX->new($cipher, $key, $iv, $adata);

	# $cipher .. 'AES' or name of any other	cipher with 16-byte block len
	# $key ..... AES key of	proper length (128/192/256bits)
	# $iv ...... unique initialization vector (no need to keep it secret)
	# $adata ... additional	authenticated data (optional)

   aad_add
	$ae->aad_add($adata);			       #can be called multiple times

   encrypt_add
	$ciphertext = $ae->encrypt_add($data);	       #can be called multiple times

   encrypt_done
	$tag = $ae->encrypt_done();

   decrypt_add
	$plaintext = $ae->decrypt_add($ciphertext);    #can be called multiple times

   decrypt_done
	my $result = $ae->decrypt_done($tag);  # returns 1 (success) or	0 (failure)
	#or
	my $tag	= $ae->decrypt_done;	       # returns $tag value

   clone
	my $ae_new = $ae->clone;

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

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

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

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

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=Crypt::AuthEnc::EAX&sektion=3&manpath=FreeBSD+12.1-RELEASE+and+Ports>

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