pincers 0.1.0

A more secure way to run scripts from the web
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use digest::DynDigest;
use md5;
use sha1;
use sha2;
use sha3;

#[derive(Debug, Clone, Copy)]
pub enum HashType {
    MD5,  // bits: 128
    SHA1, // bits: 160
    SHA2, // bits: 224, 256, 384, 512
    SHA3, // bits: 224, 256, 384, 512
}

fn hex_bits(sum: &str) -> Result<u16, String> {
    if let Some(c) = sum.chars().find(|c| !c.is_digit(16)) {
        Err(format!("Non hexdigit {} found in checksum", c))
    } else {
        Ok(sum.len() as u16 * 4)
    }
}

pub fn digest(hash: HashType, sum: &str) -> Result<Box<DynDigest>, String> {
    let bits = hex_bits(sum)?;
    match (hash, bits) {
        (HashType::MD5, 128) => Ok(Box::new(md5::Md5::default())),
        (HashType::SHA1, 160) => Ok(Box::new(sha1::Sha1::default())),
        (HashType::SHA2, 224) => Ok(Box::new(sha2::Sha224::default())),
        (HashType::SHA2, 256) => Ok(Box::new(sha2::Sha256::default())),
        (HashType::SHA2, 384) => Ok(Box::new(sha2::Sha384::default())),
        (HashType::SHA2, 512) => Ok(Box::new(sha2::Sha512::default())),
        (HashType::SHA3, 224) => Ok(Box::new(sha3::Sha3_224::default())),
        (HashType::SHA3, 256) => Ok(Box::new(sha3::Sha3_256::default())),
        (HashType::SHA3, 384) => Ok(Box::new(sha3::Sha3_384::default())),
        (HashType::SHA3, 512) => Ok(Box::new(sha3::Sha3_512::default())),
        _ => Err(format!("{:?} with length {} is invalid", &hash, bits)),
    }
}