Example implementation of CRC-32 with Rust.

crc.rs

#[derive(Debug, Clone)]
pub struct Crc32 {
    table: [u32; 256],
}

impl Crc32 {
    pub const SOURCE: u32 = 0xedb8_8320;

    pub fn new() -> Self {
        let mut table = [0u32; 256];
        for i in 0..256 {
            let mut c = i;
            for _ in 0..8 {
                if c % 2 != 0 {
                    c = Self::SOURCE ^ (c >> 1);
                } else {
                    c >>= 1;
                }
            }
            table[i as usize] = c;
        }
        Self { table }
    }

    pub fn digest(&self, bytes: &[u8]) -> u32 {
        let mut c = 0xffff_ffff;
        for &byte in bytes {
            c = self.table[((c ^ byte as u32) & 0xff) as usize] ^ (c >> 8);
        }
        c ^ 0xffff_ffff
    }
}