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use super::{Random, Generator, KeyPair, Error};
pub struct Prefix {
prefix: Vec<u8>,
iterations: usize,
}
impl Prefix {
pub fn new(prefix: Vec<u8>, iterations: usize) -> Self {
Prefix {
prefix: prefix,
iterations: iterations,
}
}
}
impl Generator for Prefix {
type Error = Error;
fn generate(&mut self) -> Result<KeyPair, Error> {
for _ in 0..self.iterations {
let keypair = Random.generate()?;
if keypair.address().starts_with(&self.prefix) {
return Ok(keypair)
}
}
Err(Error::Custom("Could not find keypair".into()))
}
}
#[cfg(test)]
mod tests {
use {Generator, Prefix};
#[test]
fn prefix_generator() {
let prefix = vec![0xffu8];
let keypair = Prefix::new(prefix.clone(), usize::max_value()).generate().unwrap();
assert!(keypair.address().starts_with(&prefix));
}
}