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Added 'Substitute' operation.

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This commit is contained in:
n1474335 2016-12-21 14:09:46 +00:00
parent e1ef228575
commit ef464ab57c
7 changed files with 83 additions and 27 deletions
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37
src/js/operations/Cipher.js
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@ -475,6 +475,43 @@ var Cipher = {
return output;
},
/**
* @constant
* @default
*/
SUBS_PLAINTEXT: "ABCDEFGHIJKLMNOPQRSTUVWXYZ",
/**
* @constant
* @default
*/
SUBS_CIPHERTEXT: "XYZABCDEFGHIJKLMNOPQRSTUVW",
/**
* Substitute operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_substitute: function (input, args) {
var plaintext = Utils.str_to_byte_array(Utils.expand_alph_range(args[0]).join()),
ciphertext = Utils.str_to_byte_array(Utils.expand_alph_range(args[1]).join()),
output = [],
index = -1;
if (plaintext.length !== ciphertext.length) {
output = Utils.str_to_byte_array("Warning: Plaintext and Ciphertext lengths differ\n\n");
}
for (var i = 0; i < input.length; i++) {
index = plaintext.indexOf(input[i]);
output.push(index > -1 && index < ciphertext.length ? ciphertext[index] : input[i]);
}
return output;
},
};