PHP Classes

Kravatte PHP Keccak Farfalle: Encrypt and decrypt data based on Farfalle

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kravatte 1.0The PHP License5PHP 5, Cryptography
Description 

Author

Jose Luis Lucas

This class can encrypt, decrypt and authenticate data based on Keccak Farfalle modes.

It can take data and computes a hash using a given secret key using Farfalle.

The class can also encrypt and decrypt data with a given key also using Farfalle modes.

Innovation Award
PHP Programming Innovation award nominee
January 2021
Number 12		 Kravatte is a function that implements a cryptography approach that can be used to encrypt data incrementally as a sequence of blocks of data that can be appended to the encryption output.

This approach is useful when you need to encrypt a stream of data with a length that is unknown initially.

This class implements a pure PHP based solution to encrypt and decrypt data using the Kravatte Farfalle construction.

Manuel Lemos
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Name: Jose Luis Lucas <contact>
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Example

<?
    include "kravatte_final.php";
   
    function xtrae($key,$vector,$x="")
        {
        $k = explode(",",explode('])',explode("$key = $x"."bytes([",$vector)[1])[0]);
        $zk = "";foreach ($k as $m) $zk .=@explode("0x",trim($m))[1];
        return pack("H*",$zk);
        }
       
    $x=new Kravatte;

    // Test Vectors

    $server = "http://raw.githubusercontent.com/inmcm/kravatte/master/tests";
   
    $fvectors = ["mac"];

    foreach ($fvectors as $f)
        {
        $count = 0;
        echo "Kravatte $f ";
        $vectors = file_get_contents("$server/test_kravatte_$f.py");
        $vectors = explode("def test_",$vectors);

        foreach (array_slice(array_slice($vectors,1),0,-1) as $vector)
            {
            $count++;
            $type = explode('(',explode('kravatte_',$vector)[1])[0];
            $size = explode("_",explode("(",$vector)[0]); $size = $size[sizeof($size)-1];
                   
            $zk = xtrae("my_key",$vector);
            $zm = xtrae("my_message",$vector);
            $out = bin2hex(xtrae("real_output",$vector));
           
            $res = $x->mac($zk,$zm, $size);
       
            if (($res != $out))
                die("$count Bad");
            }
        echo "OK $count tested\n";
        }

    $fvectors = ["sane"];

    foreach ($fvectors as $f)
        {
        $count = 0;
        echo "Kravatte $f ";
        $vectors = file_get_contents("$server/test_kravatte_$f.py");
        $vectors = explode("def test_kravatte",$vectors);

        foreach (array_slice($vectors,1) as $vector)
            {
            $count++;
            $type = explode('(',explode('SANE_',$vector)[1])[0];
                       
            $zk = xtrae("my_key",$vector);
            $zm = xtrae("my_message",$vector);
            $meta = xtrae("my_metadata",$vector);
            $nonce = xtrae("my_nonce",$vector);
            $output_ciphertext = bin2hex(xtrae("output_ciphertexts",$vector,"["));
            $output_tag = bin2hex(xtrae("output_tags",$vector,"["));
           
            $x->Kravatte_SANE($nonce,$zk);
           
            [$cipher,$tag] = $x->Kravatte_SANE_enc($zm, $meta);
           
            if (($cipher != $output_ciphertext) or ($tag != $output_tag))
                die("$count Bad");
            }
        echo "OK $count tested\n";
        }
               
    $fvectors = ["sanse"];

    foreach ($fvectors as $f)
        {
        $count = 0;
        echo "Kravatte $f ";
        $vectors = file_get_contents("$server/test_kravatte_$f.py");
        $vectors = explode("def test_kravatte",$vectors);

        foreach (array_slice($vectors,1) as $vector)
            {
            $count++;
            $type = explode('(',explode('SANSE_',$vector)[1])[0];
       
            $zk = xtrae("my_key",$vector);
            $zm = xtrae("my_message",$vector);
            $meta = xtrae("my_metadata",$vector);
            $output_ciphertext = bin2hex(xtrae("output_ciphertexts",$vector,"["));
            $output_tag = bin2hex(xtrae("output_tags",$vector,"["));
           
            $x->Kravatte_SANSE($zk);
           
            [$cipher,$tag] = $x->Kravatte_SANSE_enc($zm, $meta);
           
            if (($cipher != $output_ciphertext) or ($tag != $output_tag))
                die("$count Bad");
            }
        echo "OK $count tested\n";
        }
               
    $fvectors = ["wbc"];

    foreach ($fvectors as $f)
        {
        $count = 0;
        echo "Kravatte $f ";
        $vectors = file_get_contents("$server/test_kravatte_$f.py");
        $vectors = explode("def test_kravatte",$vectors);

        foreach (array_slice($vectors,2) as $vector)
            {
            $count++;
            $type=explode('(',explode('WBC_',$vector)[1])[0];
                   
            $zk = xtrae("my_key",$vector);
            $zm = xtrae("my_message",$vector);
            $tweak = xtrae("my_tweak",$vector);
            $output_ciphertext = bin2hex(xtrae("real_ciphertext",$vector));
           
            $x->Kravatte_WBC(strlen($zm), $tweak,$zk);
           
            $cipher = $x->Kravatte_WBC_enc($zm);
           
            if (($cipher != $output_ciphertext))
                die("$count Bad");
            }
        echo "OK $count $f tested\n";
        }
       
    $fvectors = ["wbc_ae"];

    foreach ($fvectors as $f)
        {
        $count = 0;
        echo "Kravatte $f ";
        $vectors = file_get_contents("$server/test_kravatte_$f.py");
        $vectors = explode("def test_kravatte",$vectors);

        foreach (array_slice($vectors,1) as $vector)
            {
            $count++;
            $type = explode('(',explode('WBC_AE_',$vector)[1])[0];

            $zk = xtrae("my_key",$vector);
            $zm = xtrae("my_message",$vector);
            $meta = xtrae("my_metadata",$vector);
            $output_ciphertext = bin2hex(xtrae("real_ciphertext",$vector));
                       
            $x->Kravatte_WBC_AE(strlen($zm), $zk);
           
            $cipher = $x->Kravatte_WBC_AE_enc($zm,$meta);
           
            if (($cipher != $output_ciphertext))
                die("$count Bad");
            }
        echo "OK $count $f tested\n";
        }
               
    echo "Kravatte oracle ";
    $vectors = file_get_contents("$server/test_kravatte_oracle.py");
    $vectors = explode("def test_kravatte",$vectors);

    foreach (array_slice($vectors,1) as $vector)
        {
        $type=explode('(',explode('random_oracle_',$vector)[1])[0];

        $zk = xtrae("my_key",$vector);
        $zm = xtrae("my_message",$vector);
        $real = bin2hex(xtrae("real_output",$vector));

            $x->KravatteOracle($zm, $zk);
   
            $index_ref = [[0, 1], [200, 202], [400, 404], [600, 608], [800, 816], [1000, 1032],
                         [1200, 1264], [1400, 1528], [1600, 1856], [2000, 2512], [2600, 3624],
                         [3800, 5848]];
   
            for ($h=0;$h<12;$h++)
            {
                $k = 2**$h;
                $res = $x->random($k);
                [$start, $stop] = $index_ref[$h];
                $m = substr($real,$start*2,$stop*2-$start*2);
           
            if (($m != $res))
                die("$k Bad");
            }
        }
    echo "OK \n\n";

Details

Kravatte

PHP-Kravatte Achouffe Cipher Suite: Encryption, Decryption, and Authentication Tools based on the Farfalle modes

Based on this Python implementation with minor changes https://github.com/inmcm/kravatte

Kravatte is a high-speed instance of Farfalle based on Keccak-p[1600] permutations, claimed to resist against classical and quantum adversaries. Modes for authentication, encryption and authenticated encryption are defined accordingly.

https://keccak.team/2017/updated_farfalle_kravatte.html https://eprint.iacr.org/2016/1188.pdf

It pass all tests from https://github.com/inmcm/kravatte/tree/master/tests

2021 @denobispsis

$x=new Kravatte;

MAC

$x->mac('Supersecreto', 'Et in Arcadia ego', 64)

SANE

$x->Kravatte_SANE($nonce,$key);

$cipher = $x->Kravatte_SANE_enc($message, $metadata);

[$cipher, $val]

$x->Kravatte_SANE($nonce,$key);

$plain = $x->Kravatte_SANE_dec(pack("H",$cipher[0]), $meta, pack("H",$cipher[1]));

[$message, $val]

SANSE

$x->Kravatte_SANSE($key);

$cipher = $x->Kravatte_SANSE_enc($message, $metadata);

[$cipher, $val]

$x->Kravatte_SANSE($key);

$plain = $x->Kravatte_SANSE_dec(pack("H",$cipher[0]), $meta, pack("H",$cipher[1]));

[$message, $val]

WBC

$x->Kravatte_WBC(strlen($message), $tweak,$key);

$cipher = $x->Kravatte_WBC_enc($message);
	
$x->Kravatte_WBC(strlen($message), $tweak,$key);

$message = $x->Kravatte_WBC_dec(pack("H*",$cipher));

WBC_AE

$x->Kravatte_WBC_AE(strlen($message), $key);

$cipher = $x->Kravatte_WBC_AE_enc($message,$metadata);


$x->Kravatte_WBC_AE(strlen($message),$key);

$plain = $x->Kravatte_WBC_AE_dec(pack("H*",$cipher),$metadata);

Oracle

$x->KravatteOracle($message, $key);

$x->random($size);

  Files folder image Files (3)  
File Role Description
Plain text file kravatte_final.php Class Class source
Accessible without login Plain text file README.md Doc. Documentation
Accessible without login Plain text file test_kravatte.php Example Example script

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