Data Encryption Standard: Difference between revisions

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=={{header|D}}==

<syntaxhighlight lang="d">import std.array;

<syntaxhighlight lang="d">import std.stdio, std.array, std.bitmanip;

import std.bitmanip;

import std.stdio;

immutable PC1 = [

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immutable SHIFTS = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1];

BitArray bitArrayOfSize(~~uint~~ count) {

BitArray bitArrayOfSize(ulong count) {

bool[] buffer = new bool[count];

return BitArray(buffer);

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ubyte[] encrypt(const ubyte[] key, const ubyte[] message) in {

assert(key.length == 8, "Incorrect key size");

} ~~body~~ {

} do {

BitArray[] ks = getSubKeys(key);

ubyte[] m = message.dup;

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ubyte[] decrypt(const ubyte[] key, const ubyte[] encoded) in {

assert(key.length == 8, "Incorrect key size");

} ~~body~~ {

} do {

BitArray[] ks = getSubKeys(key);

// reverse the subkeys

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private BitArray[] getSubKeys(const ubyte[] key) in {

assert(key.length == 8);

} ~~body~~ {

} do {

auto k = key.toBitArray();

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[0x0E, 0x32, 0x92, 0x32, 0xEA, 0x6D, 0x0D, 0x73],

];

immutable ubyte[][] messages = [

[cast(ubyte)0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF],

[0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87, 0x87],

[0x59, 0x6F, 0x75, 0x72, 0x20, 0x6C, 0x69, 0x70, ~~0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x73, 0x6D, 0x6F, 0x6F, 0x74, 0x68, 0x65, 0x72, 0x20, 0x74, 0x68, 0x61, 0x6E, 0x20, 0x76, 0x61, 0x73, 0x65, 0x6C, 0x69, 0x6E, 0x65, 0x0D, 0x0A],~~

[0x59, 0x6F, 0x75, 0x72, 0x20, 0x6C, 0x69, 0x70,

0x73, 0x20, 0x61, 0x72, 0x65, 0x20, 0x73, 0x6D,

0x6F, 0x6F, 0x74, 0x68, 0x65, 0x72, 0x20, 0x74,

0x68, 0x61, 0x6E, 0x20, 0x76, 0x61, 0x73, 0x65,

0x6C, 0x69, 0x6E, 0x65, 0x0D, 0x0A],

];

assert(keys.length == messages.length);

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writefln("Key : %(%02X%)", keys[i]);

writefln("Message : %(%02X%)", messages[i]);

ubyte[] encoded = encrypt(keys[i], messages[i]);

writefln("Encoded : %(%02X%)", encoded);

ubyte[] decoded = decrypt(keys[i], encoded);

writefln("Decoded : %(%02X%)", decoded);

writeln;

}