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Add Baconian Cipher #1416
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /** | ||
| * In cryptography, Bacon's cipher or the Baconian cipher is a method of steganographic message encoding devised by Francis Bacon in 1605. | ||
| * See [wiki](https://en.wikipedia.org/wiki/Bacon%27s_cipher) | ||
| */ | ||
|
|
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| const baconianAlphabet = { | ||
| A: 'AAAAA', | ||
| B: 'AAAAB', | ||
| C: 'AAABA', | ||
| D: 'AAABB', | ||
| E: 'AABAA', | ||
| F: 'AABAB', | ||
| G: 'AABBA', | ||
| H: 'AABBB', | ||
| I: 'ABAAA', | ||
| J: 'ABAAB', | ||
| K: 'ABABA', | ||
| L: 'ABABB', | ||
| M: 'ABBAA', | ||
| N: 'ABBAB', | ||
| O: 'ABBBA', | ||
| P: 'ABBBB', | ||
| Q: 'BAAAA', | ||
| R: 'BAAAB', | ||
| S: 'BAABA', | ||
| T: 'BAABB', | ||
| U: 'BABAA', | ||
| V: 'BABAB', | ||
| W: 'BABBA', | ||
| X: 'BABBB', | ||
| Y: 'BBAAA', | ||
| Z: 'BBAAB', | ||
| ' ': ' ' | ||
| } | ||
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| /** | ||
| * @function baconianEncode | ||
| * @description - Encodes a message using baconian cipher | ||
| * @param {string} message - Message to encode | ||
| * @return {string} A string with the encoded message | ||
| */ | ||
| const baconianEncode = (message) => { | ||
| if (typeof message !== 'string') { | ||
| throw new TypeError('The message must be a string') | ||
| } | ||
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| message = message.toUpperCase() | ||
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| let result = '' | ||
|
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| message.split('').forEach((char) => { | ||
| result += baconianAlphabet[char] | ||
| }) | ||
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| return result | ||
| } | ||
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| /** | ||
| * @function baconianDecode | ||
| * @description - Decoded a message encoded using baconian cipher | ||
| * @param {string} message - Message to decode | ||
| * @return {string} A string with the decoded message | ||
| */ | ||
| const baconianDecode = (message) => { | ||
| if (typeof message !== 'string') { | ||
| throw new TypeError('The encoded message must be a string') | ||
| } | ||
|
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| if (!/^[AB ]+$/.test(message)) { | ||
| throw new TypeError('The encoded message should consist only of "A"s, "B"s and whitespaces') | ||
| } | ||
|
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| message = message.toUpperCase() | ||
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| let result = '' | ||
| const messageArray = message.split(' ') | ||
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| messageArray.forEach((word, index) => { | ||
| for (let i = 0; i < word.length; i += 5) { | ||
| const letter = Object.keys(baconianAlphabet).find( | ||
| (key) => { | ||
| return baconianAlphabet[key] === word.substring(i, i + 5) | ||
| } | ||
| ) | ||
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| if (letter) { | ||
| result += letter | ||
| } | ||
| } | ||
| if (index < messageArray.length - 1) { | ||
| result += ' ' | ||
| } | ||
| }) | ||
|
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| return result | ||
| } | ||
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| export { | ||
| baconianEncode, | ||
| baconianDecode | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| import { | ||
| baconianEncode, | ||
| baconianDecode | ||
| } from '../BaconianCipher' | ||
|
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| test('"Hello world" === baconianDecode(baconianEncode("Hello world"))', () => { | ||
| const word = 'Hello world' | ||
| const expectedResult = 'HELLO WORLD' | ||
| const result = baconianDecode(baconianEncode(word)) | ||
| expect(result).toMatch(expectedResult) | ||
| }) | ||
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| test('"AABBBAABAAABABBABABBABBBA BABBAABBBABAAABABABBAAABB" === baconianEncode(baconianDecode("AABBBAABAAABABBABABBABBBA BABBAABBBABAAABABABBAAABB"))', () => { | ||
| const word = 'AABBBAABAAABABBABABBABBBA BABBAABBBABAAABABABBAAABB' | ||
| const result = baconianEncode(baconianDecode(word)) | ||
| expect(result).toMatch(word) | ||
| }) |
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