atsushi130 / cryptor Goto Github PK

Unless you define an extensible exception, you can not extend exception of dedicated to user-defined cryption algorithms.

Algorithm trait is defined as follw.

pub trait Algorithm {
    type V: Algorithm;
    fn encrypt(&mut self, character: &char) -> Result<CryptoValue<Self::V>, CryptoError>;
    fn decrypt(&mut self, character: &char) -> Result<CryptoValue<Self::V>, CryptoError>;
}

If it is as it is, can only predefined exceptions can be issued.

Update documentation link

version up to 0.1.3

• Cryptor
• Base64 algorithm
• Crates.io documentation badge

Currently don't error handling of A and B, so we need to do that.
The thing to consider is that there is a possibility of Base64 crate and utf8 convertion errors. So should implement automatic conversion to proprietary errors.

enum CryptoError { ... }
impl Display for CryptoError { ... }
impl Error for CryptoErro { ... }

Error of base64 crate is DecodeError.

impl From<DecodeError> for CryptoError { ... }

Error of utf8 convertion is FromUtf8Error.

impl From<FromUtf8Error> for CryptoError { ... }

Request

Define an associated function to builds new Cryptor. Associated function injects Algorithm into Cryptor and generates it.

impl<T: Algorithm> Cryptor<T> {
    pub fn new(algorithm: T) -> Self { ... }
}

before

let cryptor = Cryptor {
    algorithm: Algorithm { ... }
}

after

let cryptor = Cryptor::new(algorithm);

Acceptance conditions

• Cryptor is able to crypto with base64 algorithm

Design

Design of base64 algorithm implementation is as follows.

struct Base64;
impl Algorithm for Base64 {
    type V = Base64;
    fn encrypt(&mut self, string: &str) -> CryptoValue<Self::V> { ... }
    fn decrypt(&mut self, string: &str) -> CryptoValue<Self::V> { ... }
}