Make HashAlgo more idiomatic

[rusty1968]

https://github.com/AspeedTech-BMC/aspeed-rust/blob/2e04396ebab3db4d7b122cc8296efcf058505b8c/src/hash.rs#L199

Your methods can be const - const fn methods are evaluated at compile time.
#[derive(Copy, Clone)]
pub enum HashAlgo {
SHA1,
SHA224,
SHA256,
SHA384,
SHA512,
SHA512_224,
SHA512_256,
}

impl HashAlgo {
pub const fn digest_size(&self) -> usize {
match self {
HashAlgo::SHA1 => 20,
HashAlgo::SHA224 | HashAlgo::SHA512_224 => 28,
HashAlgo::SHA256 | HashAlgo::SHA512_256 => 32,
HashAlgo::SHA384 => 48,
HashAlgo::SHA512 => 64,
}
}

pub const fn block_size(&self) -> usize {
    match self {
        HashAlgo::SHA1 | HashAlgo::SHA224 | HashAlgo::SHA256 => 64,
        HashAlgo::SHA384 | HashAlgo::SHA512 | HashAlgo::SHA512_224 | HashAlgo::SHA512_256 => 128,
    }
}

pub const fn bitmask(&self) -> u32 {
    match self {
        HashAlgo::SHA1 => HACE_ALGO_SHA1,
        HashAlgo::SHA224 => HACE_ALGO_SHA224,
        HashAlgo::SHA256 => HACE_ALGO_SHA256,
        HashAlgo::SHA512 => HACE_ALGO_SHA512,
        HashAlgo::SHA384 => HACE_ALGO_SHA384,
        HashAlgo::SHA512_224 => HACE_ALGO_SHA512_224,
        HashAlgo::SHA512_256 => HACE_ALGO_SHA512_256,
    }
}

pub const fn iv(&self) -> &'static [u32] {
    match self {
        HashAlgo::SHA1 => &SHA1_IV,
        HashAlgo::SHA224 => &SHA224_IV,
        HashAlgo::SHA256 => &SHA256_IV,
        HashAlgo::SHA384 => &SHA384_IV,
        HashAlgo::SHA512 => &SHA512_IV,
        HashAlgo::SHA512_224 => &SHA512_224_IV,
        HashAlgo::SHA512_256 => &SHA512_256_IV,
    }
}

pub const fn iv_size(&self) -> usize {
    match self {
        HashAlgo::SHA1 => SHA1_IV.len(),
        HashAlgo::SHA224 => SHA224_IV.len(),
        HashAlgo::SHA256 => SHA256_IV.len(),
        HashAlgo::SHA384 => SHA384_IV.len(),
        HashAlgo::SHA512 => SHA512_IV.len(),
        HashAlgo::SHA512_224 => SHA512_224_IV.len(),
        HashAlgo::SHA512_256 => SHA512_256_IV.len(),
    }
}

pub const fn hash_cmd(&self) -> u32 {
    const COMMON_FLAGS: u32 = HACE_CMD_ACC_MODE | HACE_SHA_BE_EN | HACE_SG_EN;
    COMMON_FLAGS | self.bitmask()
}

}