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Bombe: add trial decryption preview

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s2224834 2019-01-08 19:37:34 +00:00
parent ad6e30f3d4
commit e74c86842b
3 changed files with 79 additions and 16 deletions
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8
src/core/operations/Bombe.mjs
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@ -112,7 +112,7 @@ class Bombe extends Operation {
// For symmetry with the Enigma op, for the input we'll just remove all invalid characters
input = input.replace(/[^A-Za-z]/g, "").toUpperCase();
crib = crib.replace(/[^A-Za-z]/g, "").toUpperCase();
const ciphertext = input.slice(offset, offset+crib.length);
const ciphertext = input.slice(offset);
const reflector = new Reflector(reflectorstr);
let update;
if (ENVIRONMENT_IS_WORKER()) {
@ -122,9 +122,9 @@ class Bombe extends Operation {
}
const bombe = new BombeMachine(rotors, reflector, ciphertext, crib, update);
const result = bombe.run();
let msg = `Bombe run on menu with ${bombe.nLoops} loops (2+ desirable). Note: Rotor positions are listed left to right and start at the beginning of the crib, and ignore stepping and the ring setting. One stecker pair is determined. Results:\n`;
for (const [setting, wires] of result) {
msg += `Stop: ${setting} (${wires})\n`;
let msg = `Bombe run on menu with ${bombe.nLoops} loops (2+ desirable). Note: Rotor positions are listed left to right and start at the beginning of the crib, and ignore stepping and the ring setting. One stecker pair is determined. A decryption preview starting at the beginning of the crib and ignoring stepping is also provided. Results:\n`;
for (const [setting, stecker, decrypt] of result) {
msg += `Stop: ${setting} (plugboard: ${stecker}): ${decrypt}\n`;
}
return msg;
}