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 datagcm_decrypt_verify
my $plaintext = gcm_decrypt_verify($cipher, $key, $iv, $adata, $ciphertext, $tag);
# on error returns undefMETHODS
new
my $ae = Crypt::AuthEnc::GCM->new($cipher, $key);
# $cipher .. 'AES' or name of any other cipher
# $key ..... encryption key of proper lengthiv_add
$ae->iv_add($iv_data); #can be called multiple timesaad_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 timesencrypt_add
$ciphertext = $ae->encrypt_add($data); #can be called multiple timesencrypt_done
$tag = $ae->encrypt_done();decrypt_add
$plaintext = $ae->decrypt_add($ciphertext); #can be called multiple timesdecrypt_done
my $result = $ae->decrypt_done($tag); # returns 1 (success) or 0 (failure)
#or
my $tag = $ae->decrypt_done; # returns $tag valuereset
$ae->reset;clone
my $ae_new = $ae->clone;