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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| "use strict"; | ||
| Object.defineProperty(exports, "__esModule", { value: true }); | ||
| class AffineCipher { | ||
| constructor(a, b) { | ||
| this.ciphers = []; | ||
| this.N = 48; | ||
| this.M = 75; | ||
| this.encrypt = (text) => { | ||
| return text.split('') | ||
| .map(c => this.ciphers[c.charCodeAt(0) - this.M] || ' ') | ||
| .reduce((p, n) => p + n); | ||
| }; | ||
| this.decrypt = (text) => { | ||
| return text.split('') | ||
| .map(c => this.decryptChar(c) || ' ') | ||
| .reduce((p, n) => p + n); | ||
| }; | ||
| this.decryptChar = (cipher) => { | ||
| const index = this.ciphers.indexOf(cipher); | ||
| return (index == -1) ? null : String.fromCharCode(index + this.M); | ||
| }; | ||
| this.affine = (a, b) => { | ||
| for (let i = this.N; i < this.M + this.N; i++) { | ||
| const x = i - this.N; | ||
| const x1 = a * x + b; | ||
| const x2 = x1 % this.M; | ||
| const cipher = String.fromCharCode(x2 + this.N); | ||
| if (this.ciphers.indexOf(cipher) == -1) { | ||
| this.ciphers.push(cipher); | ||
| } | ||
| else { | ||
| throw Error(`The value of a has to be coprime with ${this.M}`); | ||
| } | ||
| } | ||
| }; | ||
| this.affine(a, b); | ||
| } | ||
| } | ||
| AffineCipher.encrypt = (text) => { | ||
| return ''; | ||
| }; | ||
| AffineCipher.decrypt = (text) => { | ||
| return ''; | ||
| }; | ||
| exports.AffineCipher = AffineCipher; | ||
| exports.default = AffineCipher; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| "use strict"; | ||
| Object.defineProperty(exports, "__esModule", { value: true }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| import { Cipher } from './Cipher'; | ||
| export declare class AffineCipher implements Cipher { | ||
| private ciphers; | ||
| private N; | ||
| private M; | ||
| constructor(a: number, b: number); | ||
| static encrypt: (text: string) => string; | ||
| static decrypt: (text: string) => string; | ||
| encrypt: (text: string) => string; | ||
| decrypt: (text: string) => string; | ||
| private decryptChar; | ||
| private affine; | ||
| } | ||
| export default AffineCipher; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| export interface Cipher { | ||
| encrypt(text: string): string; | ||
| decrypt(text: string): string; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| export { Rot13Cipher } from './Rot13Cipher'; | ||
| export { CaesarCipher } from './CaesarCipher'; | ||
| export { MorseCipher } from './MorseCipher'; | ||
| export { AffineCipher } from './AffineCipher'; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| import { Cipher } from './Cipher'; | ||
|
|
||
| export class AffineCipher implements Cipher { | ||
|
|
||
| private ciphers: Array<string> = []; | ||
|
|
||
| private N = 48; | ||
| private M = 75; | ||
|
|
||
| constructor(a: number, b: number) { | ||
| this.affine(a, b); | ||
| } | ||
|
|
||
| public static encrypt = (text: string) => { | ||
| return ''; | ||
| } | ||
|
|
||
| public static decrypt = (text: string) => { | ||
| return ''; | ||
| } | ||
|
|
||
| public encrypt = (text: string): string => { | ||
| return text.split('') | ||
| .map(c => this.ciphers[c.charCodeAt(0) - this.M] || ' ') | ||
| .reduce((p, n) => p + n); | ||
| } | ||
|
|
||
| public decrypt = (text: string) => { | ||
| return text.split('') | ||
| .map(c => this.decryptChar(c) || ' ') | ||
| .reduce((p, n) => p + n); | ||
| } | ||
|
|
||
| private decryptChar = (cipher: string) => { | ||
| const index = this.ciphers.indexOf(cipher); | ||
| return (index == -1) ? null : String.fromCharCode(index + this.M); | ||
| } | ||
|
|
||
| private affine = (a: number, b: number) => { | ||
| for (let i = this.N; i < this.M + this.N; i++) { | ||
| const x = i - this.N; | ||
| const x1 = a * x + b; | ||
| const x2 = x1 % this.M; | ||
|
|
||
| const cipher = String.fromCharCode(x2 + this.N); | ||
| if (this.ciphers.indexOf(cipher) == -1) { | ||
| this.ciphers.push(cipher); | ||
| } else { | ||
| throw Error(`The value of a has to be coprime with ${this.M}`); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export default AffineCipher; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,4 @@ | ||
| export interface Cipher { | ||
| encrypt(text: string): string; | ||
| decrypt(text: string): string; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| import { expect } from 'chai'; | ||
|
|
||
| import { AffineCipher } from '../src/index'; | ||
|
|
||
| describe(`Test "AffineCipher"`, () => { | ||
| const encrypter = new AffineCipher(7, 10); | ||
| let encrypted = 'oZ@@U BUj@S'; | ||
| let decrypted = 'hello world'; | ||
|
|
||
| // it('Check static "AffineCipher.encrypt"', () => { | ||
| // expect(encrypted).to.be.equal(AffineCipher.encrypt(decrypted, 10)); | ||
| // }); | ||
|
|
||
| // it('Check static "AffineCipher.decrypt"', () => { | ||
| // expect(decrypted).to.be.equal(AffineCipher.decrypt(encrypted, 10)); | ||
| // }); | ||
|
|
||
| it('Check "AffineCipher.encrypt"', () => { | ||
| expect(encrypted).to.be.equal(encrypter.encrypt(decrypted)); | ||
| }); | ||
|
|
||
| it('Check "AffineCipher.decrypt"', () => { | ||
| expect(decrypted).to.be.equal(encrypter.decrypt(encrypted)); | ||
| }); | ||
| }); |