unshell/src/crypto/mod.rs

use alloc::string::String;

mod hash;
mod ordering;

pub use hash::sha256;
pub use ordering::feistel_shuffle;

#[macro_export]
macro_rules! hash_256 {
    ($s:literal) => {{
        // string literal arm
        const HASH: [u8; 32] = $crate::crypto::sha256($s.as_bytes());
        HASH
    }};
    ($n:expr) => {{
        // integer/expression arm
        const BYTES: [u8; 8] = ($n as u64).to_be_bytes();
        const HASH: [u8; 32] = $crate::crypto::sha256(&BYTES);
        HASH
    }};
}

#[macro_export]
macro_rules! hash_32 {
    ($s:literal) => {{
        // string literal arm
        const HASH: [u8; 32] = $crate::crypto::sha256($s.as_bytes());
        const RESULT: u32 = u32::from_be_bytes([HASH[0], HASH[8], HASH[16], HASH[24]]);
        RESULT
    }};
    ($n:expr) => {{
        // integer/expression arm
        const BYTES: [u8; 8] = ($n as u64).to_be_bytes();
        const HASH: [u8; 32] = $crate::crypto::sha256(&BYTES);
        const RESULT: u32 = u32::from_be_bytes([HASH[0], HASH[8], HASH[16], HASH[24]]);
        RESULT
    }};
}

pub fn hash_string_32(input: String) -> u32 {
    let hash: [u8; 32] = sha256(input.as_bytes());
    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
}

pub fn hash_str_32(input: &str) -> u32 {
    let hash: [u8; 32] = sha256(input.as_bytes());
    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
}

pub fn hash_32(input: u32) -> u32 {
    let hash: [u8; 32] = sha256(&input.to_be_bytes());
    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
}