### OO interface
use Crypt::AuthEnc::ChaCha20Poly1305;
# encrypt and authenticate
my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
$ae->adata_add('additional_authenticated_data1');
$ae->adata_add('additional_authenticated_data2');
my $ct = $ae->encrypt_add('data1');
$ct .= $ae->encrypt_add('data2');
$ct .= $ae->encrypt_add('data3');
my $tag = $ae->encrypt_done();
# decrypt and verify
my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv);
$ae->adata_add('additional_authenticated_data1');
$ae->adata_add('additional_authenticated_data2');
my $pt = $ae->decrypt_add('ciphertext1');
$pt .= $ae->decrypt_add('ciphertext2');
$pt .= $ae->decrypt_add('ciphertext3');
my $tag = $ae->decrypt_done();
die "decrypt failed" unless $tag eq $expected_tag;
#or
my $result = $ae->decrypt_done($expected_tag); # 0 or 1
### functional interface
use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify);
my ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext);
my $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag);
You can export selected functions:
use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify);
my ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext); # $key ..... key of proper length (128 or 256 bits / 16 or 32 bytes) # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes) # $adata ... additional authenticated data (optional)
my $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag); # on error returns undef
my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv); # $key ..... encryption key of proper length (128 or 256 bits / 16 or 32 bytes) # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes)
$ae->adata_add($aad_data); # can be called multiple times
$ciphertext = $ae->encrypt_add($data); # can be called multiple times
$tag = $ae->encrypt_done(); # returns $tag value
$plaintext = $ae->decrypt_add($ciphertext); # can be called multiple times
my $tag = $ae->decrypt_done; # returns $tag value #or my $result = $ae->decrypt_done($tag); # returns 1 (success) or 0 (failure)
my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key)->set_iv($iv); # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes)
my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key)->set_iv_rfc7905($iv, $seqnum); # $iv ...... initialization vector (96 bits / 12 bytes) # $seqnum .. 64bit integer (sequence number)
my $ae_new = $ae->clone;