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Improved support for different alphabets in 'Substitute' operation

feature-extract-files
n1474335 2017-06-23 13:21:19 +00:00
parent 5c774a3ce2
commit 14b7c4bf23
2 changed files with 9 additions and 9 deletions
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4
src/core/config/OperationConfig.js
View File

@ -3196,8 +3196,8 @@ const OperationConfig = {
"Substitute": {
description: "A substitution cipher allowing you to specify bytes to replace with other byte values. This can be used to create Caesar ciphers but is more powerful as any byte value can be substituted, not just letters, and the substitution values need not be in order.<br><br>Enter the bytes you want to replace in the Plaintext field and the bytes to replace them with in the Ciphertext field.<br><br>Non-printable bytes can be specified using string escape notation. For example, a line feed character can be written as either <code>\\n</code> or <code>\\x0a</code>.<br><br>Byte ranges can be specified using a hyphen. For example, the sequence <code>0123456789</code> can be written as <code>0-9</code>.",
run: Cipher.runSubstitute,
inputType: "byteArray",
outputType: "byteArray",
inputType: "string",
outputType: "string",
args: [
{
name: "Plaintext",

14
src/core/operations/Cipher.js
View File

@ -608,23 +608,23 @@ const Cipher = {
/**
* Substitute operation.
*
* @param {byteArray} input
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
* @returns {string}
*/
runSubstitute: function (input, args) {
let plaintext = Utils.strToByteArray(Utils.expandAlphRange(args[0]).join()),
ciphertext = Utils.strToByteArray(Utils.expandAlphRange(args[1]).join()),
output = [],
let plaintext = Utils.expandAlphRange(args[0]).join(),
ciphertext = Utils.expandAlphRange(args[1]).join(),
output = "",
index = -1;
if (plaintext.length !== ciphertext.length) {
output = Utils.strToByteArray("Warning: Plaintext and Ciphertext lengths differ\n\n");
output = "Warning: Plaintext and Ciphertext lengths differ\n\n";
}
for (let i = 0; i < input.length; i++) {
index = plaintext.indexOf(input[i]);
output.push(index > -1 && index < ciphertext.length ? ciphertext[index] : input[i]);
output += index > -1 && index < ciphertext.length ? ciphertext[index] : input[i];
}
return output;