Zig

56-bit DES Encryption, ECB, CBC modes

See more Encryption Examples

Demonstrates the older 56-bit DES encryption in ECB and CBC modes. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();

    // Specify DES for the encryption algorithm:
    crypt.setCryptAlgorithm("des");

    // CipherMode may be "ecb" or "cbc"
    crypt.setCipherMode("cbc");

    // Keylength is 64 bits (56 bits + 8 parity bits)
    crypt.setKeyLength(64);

    // The padding scheme determines the contents of the bytes
    // that are added to pad the result to a multiple of the
    // encryption algorithm's block size.  DES has a block
    // size of 8 bytes, so encrypted output is always
    // a multiple of 8.
    crypt.setPaddingScheme(0);

    // EncodingMode specifies the encoding of the output for
    // encryption, and the input for decryption.
    // It may be "hex", "url", "base64", or "quoted-printable".
    crypt.setEncodingMode("hex");

    // An initialization vector is required if using CBC or CFB modes.
    // ECB mode does not use an IV.
    // The length of the IV is equal to the algorithm's block size.
    // It is NOT equal to the length of the key.
    const iv_hex = "0001020304050607";
    crypt.setEncodedIV(iv_hex, "hex");

    // The secret key must equal the size of the key.  For
    // DES, the key must be 8 bytes (i.e. 64-bits).
    const key_hex = "0001020304050607";
    crypt.setEncodedKey(key_hex, "hex");

    // Encrypt a string...
    // The input string is 44 ANSI characters (i.e. 44 bytes), so
    // the output should be 48 bytes (a multiple of 8).
    // Because the output is a hex string, it should
    // be 96 characters long (2 chars per byte).
    const enc_str = try crypt.encryptStringENC(alloc, "The quick brown fox jumps over the lazy dog.");
    std.debug.print("{s}\n", .{enc_str});

    // Now decrypt:
    const dec_str = try crypt.decryptStringENC(alloc, enc_str);
    std.debug.print("{s}\n", .{dec_str});
}