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use rand::{rngs::OsRng, Rng};
use std::{convert::TryFrom, ops::Deref};
pub const DEFAULT_KEY_LEN: usize = super::xor::XOR_KEY_LEN;
pub struct EncryptionKey {
data: Vec<u8>,
}
impl EncryptionKey {
pub fn new(key: &'_ str, key_len: usize) -> Result<Self, String> {
let mut key = hex::decode(key.trim_start_matches("0x")).map_err(|e| e.to_string())?;
if key.len() != key_len {
key = key.into_iter().cycle().take(DEFAULT_KEY_LEN).collect::<Vec<_>>();
}
Ok(Self { data: key })
}
pub fn random(key_len: usize) -> Self {
let mut key = vec![0u8; key_len];
let mut rng = OsRng::default();
rng.fill(&mut key[..]);
Self { data: key }
}
pub fn as_str(&self) -> String { hex::encode(&self.data) }
}
impl Default for EncryptionKey {
fn default() -> Self { Self::random(DEFAULT_KEY_LEN) }
}
impl Deref for EncryptionKey {
type Target = Vec<u8>;
fn deref(&self) -> &Self::Target { &self.data }
}
impl AsRef<EncryptionKey> for EncryptionKey {
fn as_ref(&self) -> &Self { &self }
}
impl TryFrom<String> for EncryptionKey {
type Error = String;
fn try_from(value: String) -> Result<Self, Self::Error> { Self::new(value.as_str(), DEFAULT_KEY_LEN) }
}
impl TryFrom<&str> for EncryptionKey {
type Error = String;
fn try_from(value: &str) -> Result<Self, Self::Error> { Self::new(value, DEFAULT_KEY_LEN) }
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_new_key() {
let key = EncryptionKey::new("0xaabbccddeeff", DEFAULT_KEY_LEN).unwrap();
assert_eq!(key.data.len(), DEFAULT_KEY_LEN);
assert_eq!(
key.data,
vec![
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0xaa, 0xbb, 0xcc, 0xdd, 0xee,
0xff, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0xaa, 0xbb
]
);
let key = EncryptionKey::new("0xaabbccddeeff", 6).unwrap();
assert_eq!(key.data.len(), 6);
assert_eq!(key.data, vec![0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff]);
assert_eq!(EncryptionKey::try_from("0xa").is_err(), true);
assert_eq!(EncryptionKey::try_from("0xaab").is_err(), true);
}
#[test]
fn test_as_str() {
let key = EncryptionKey::try_from("0xaabbccddeeff").unwrap();
assert_eq!(
key.as_str(),
"aabbccddeeffaabbccddeeffaabbccddeeffaabbccddeeffaabbccddeeffaabb"
);
let key = EncryptionKey::new("0xaabbccddeeff", 6).unwrap();
assert_eq!(key.as_str(), "aabbccddeeff");
}
}