Created
August 3, 2024 14:09
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A simple example of Caesar Cipher made in swift
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| struct CaesarCipher { | |
| enum Operation { | |
| case encode | |
| case decode | |
| } | |
| let charTable: [Character] | |
| private func crypt(text: String, shift: Int, operation: Operation) -> String { | |
| var result: [Character] = [] | |
| let charTable = operation == .decode ? Array(charTable.reversed()) : charTable | |
| for character in text { | |
| guard let index = charTable.firstIndex(of: character) else { | |
| result.append(character) | |
| continue | |
| } | |
| let newIndex = (index + shift) % charTable.count | |
| result.append(charTable[newIndex]) | |
| } | |
| return String(result) | |
| } | |
| func callAsFunction(text: String, shift: Int, operation: Operation) -> String { | |
| crypt(text: text, shift: shift, operation: operation) | |
| } | |
| } | |
| // =================================== | |
| // USAGE | |
| // =================================== | |
| let charTable = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890 ,." | |
| let cipher = CaesarCipher(charTable: Array(charTable)) | |
| let sourceText = "Yes, this is my source text." | |
| let shift = 234 | |
| let encodedText = cipher(text: sourceText, shift: shift, operation: .encode) | |
| let decodedText = cipher(text: encodedText, shift: shift, operation: .decode) | |
| print("===== RESULT =====") | |
| print("Source Text: \(sourceText)") | |
| print("Encode Text: \(encodedText)") | |
| print("Decode Text: \(decodedText)") |
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