sdfsd.rs

/**
 * Converts a string representation of a key into a byte array. The supplied
 * string must contain 64 hex-characters.
 *
 * Returns a byte array of length 32 on success.
 * Returns None on failure.
 */
pub fn key_string_to_bytes(s: &str) -> Option<[u8; 32]> {
    if s.len() < 64 {
        return None;
    }

    let mut result = [0; 32];
    let mut idx = 0;

    for i in 0..result.len() {
        match u8::from_str_radix(&s[idx..idx+2], 16) {
            Ok(byte) => result[i] = byte,
            Err(e) => {
                error!("Failed to convert string: {}; err={:?}", s, e);
                return None;
            },
        };

        idx += 2;
    }

    return Some(result);
}