libcryptx-perl/t/auth_enc_ccm.t

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use strict;
use warnings;
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use Test::More tests => 13;
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use Crypt::AuthEnc::CCM qw( ccm_encrypt_authenticate ccm_decrypt_verify );
my $nonce = "random-nonce";
my $key = "12345678901234561234567890123456";
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{
my $pt = "plain_half";
my $ct;
my $m1 = Crypt::AuthEnc::CCM->new("AES", $key, $nonce, "abc", 16, 20);
$ct = $m1->encrypt_add($pt);
$ct .= $m1->encrypt_add($pt);
my $tag = $m1->encrypt_done;
is(unpack('H*', $ct), "96b0114ff47da72e92631aadce84f203a8168b20", "enc: ciphertext");
is(unpack('H*', $tag), "fdc41ec07673ec132f1910ba771b9530", "enc: tag");
my $d1 = Crypt::AuthEnc::CCM->new("AES", $key, $nonce, "abc", 16, 20);
my $pt2 = $d1->decrypt_add($ct);
my $tag2 = $d1->decrypt_done();
is($pt2, "plain_halfplain_half", "dec1: plaintext");
is(unpack('H*', $tag2), "fdc41ec07673ec132f1910ba771b9530", "dec1: tag");
my $d2 = Crypt::AuthEnc::CCM->new("AES", $key, $nonce, "abc", 16, 20);
my $pt3;
$pt3 .= $d2->decrypt_add(substr($ct,$_-1,1)) for (1..length($ct));
my $tag3 = $d2->decrypt_done();
is($pt3, "plain_halfplain_half", "dec2: plaintext");
is(unpack('H*', $tag3), "fdc41ec07673ec132f1910ba771b9530", "dec2: tag");
}
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{
my ($ct, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, "header-abc", 16, "plain_halfplain_half");
is(unpack('H*', $ct), "96b0114ff47da72e92631aadce84f203a8168b20", "ccm_encrypt_authenticate: ciphertext");
is(unpack('H*', $tag), "9485c6d5709b43431a4f05370cc22603", "ccm_encrypt_authenticate: tag");
my $pt = ccm_decrypt_verify('AES', $key, $nonce, "header-abc", $ct, $tag);
is($pt, "plain_halfplain_half", "ccm_decrypt_verify: plaintext");
}
{
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my ($ct, $tag) = ccm_encrypt_authenticate('AES', $key, $nonce, "", 16, "plain_halfplain_half");
my ($ct2, $tag2) = ccm_encrypt_authenticate('AES', $key, $nonce, undef, 16, "plain_halfplain_half");
ok($ct eq $ct2 && $tag eq $tag2, "header '' vs. undef");
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is(unpack('H*', $ct), "96b0114ff47da72e92631aadce84f203a8168b20", "ccm_encrypt_authenticate: ciphertext (no header)");
is(unpack('H*', $tag), "9e9cba5dd4939d0d8e2687c85c5d3b89", "ccm_encrypt_authenticate: tag (no header)");
my $pt = ccm_decrypt_verify('AES', $key, $nonce, "", $ct, $tag);
is($pt, "plain_halfplain_half", "ccm_decrypt_verify: plaintext (no header)");
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}