ursa 0.1.0-dev-2

This is the shared crypto library for Hyperledger components.
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use CryptoError;

pub fn bin2hex(b: &[u8]) -> String {
    b.iter()
     .map(|b| format!("{:02x}", b))
     .collect::<Vec<_>>()
     .join("")
}

pub fn hex2bin(s: &str) -> Result<Vec<u8>, CryptoError> {
    if s.len() % 2 != 0 {
        return Err(CryptoError::ParseError("Invalid string".to_string()))
    }
    for (i, ch) in s.chars().enumerate() {
        if !ch.is_digit(16) {
            return Err(CryptoError::ParseError(format!("Invalid character position {}", i)));
        }
    }

    let input: Vec<_> = s.chars().collect();

    let decoded: Vec<u8> = input.chunks(2).map(|chunk| {
        ((chunk[0].to_digit(16).unwrap() << 4) |
        (chunk[1].to_digit(16).unwrap())) as u8
    }).collect();

    Ok(decoded)
}