Macro ethdigest::keccak

macro_rules! keccak {
    ($data:expr $(,)?) => { ... };
    ($($part:expr),* $(,)?) => { ... };
}

Macro to create Ethereum digest values for compile-time hashed input.

Examples

Basic usage:

assert_eq!(
    Digest::of("Hello Ethereum!"),
    keccak!(b"Hello Ethereum!",),
);

The input can be split into parts:

assert_eq!(
    Digest::of("Hello Ethereum!"),
    keccak!(b"Hello", b" ", b"Ethereum!"),
);

Note that this can be used in const contexts, but unfortunately not in pattern matching contexts:

const DIGEST: Digest = keccak!(b"I will never change...");

match Digest::of("thing") {
    keccak!("thing") => println!("matches"),
    _ => println!("doesn't match"),
}

Additionally, this can be composed with other macros and constant expressions:

const FILEHASH: Digest = keccak!(include_bytes!("../README.md"));
const PIHASH: Digest = keccak!(concat!("const PI = ", 3.14).as_bytes());