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CryptX-0.026_30
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/ Crypt::AuthEnc::GCM

NAME

Crypt::AuthEnc::GCM - Authenticated encryption in GCM mode

SYNOPSIS

### OO interface

# encrypt and authenticate
my $ae = Crypt::AuthEnc::GCM->new("AES", $key);
$ae->iv_add('data_iv1');
$ae->iv_add('data_iv2');
$ae->aad_add('data_aad1');
$ae->aad_add('data_aad2');
$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::GCM->new("AES", $key);
$ae->iv_add('data_iv1');
$ae->iv_add('data_iv2');
$ae->aad_add('data_aad1');
$ae->aad_add('data_aad2');
$pt = $ae->decrypt_add($ciphertext1);
$pt = $ae->decrypt_add($ciphertext2);
$pt = $ae->decrypt_add($ciphertext3);
$tag = $ae->decrypt_done();

### functional interface
use Crypt::AuthEnc::GCM qw(gcm_encrypt_authenticate gcm_decrypt_verify);

my ($ciphertext, $tag) = gcm_encrypt_authenticate('AES', $key, $iv, $adata, $plaintext);
my $plaintext = gcm_decrypt_verify('AES', $key, $iv, $adata, $ciphertext, $tag);

DESCRIPTION

Galois/Counter Mode (GCM) - provides encryption and authentication.

EXPORT

Nothing is exported by default.

You can export selected functions:

use Crypt::AuthEnc::GCM qw(gcm_encrypt_authenticate gcm_decrypt_verify);

FUNCTIONS

gcm_encrypt_authenticate

my ($ciphertext, $tag) = gcm_encrypt_authenticate($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 ...... initial vector
# $adata ... additional authentication data

gcm_decrypt_verify

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

# on error returns undef

METHODS

new

my $ae = Crypt::AuthEnc::GCM->new($cipher, $key);

# $cipher .. 'AES' or name of any other cipher
# $key ..... encryption key of proper length

iv_add

$ae->iv_add($iv_data);                 #can be called multiple times

aad_add

Can be called after all iv_add calls but before the first encrypt_add or decrypt_add;

$ae->aad_add($aad_data);               #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

reset

$ae->reset;

clone

my $ae_new = $ae->clone;

SEE ALSO