Almost eliminate util module

core/src/util.rs

@@ -1,50 +1,4 @@
-use num_bigint::BigUint;
-use num_integer::Integer;
-use num_traits::{One, Zero};
-use rand::Rng;
 use std::mem;
-use std::ops::{Mul, Rem, Shr};
-
-pub fn rand_vec<G: Rng>(rng: &mut G, size: usize) -> Vec<u8> {
-    ::std::iter::repeat(())
-        .map(|()| rng.gen())
-        .take(size)
-        .collect()
-}
-
-pub fn url_encode(inp: &str) -> String {
-    let mut encoded = String::new();
-
-    for c in inp.as_bytes().iter() {
-        match *c as char {
-            'A'..='Z' | 'a'..='z' | '0'..='9' | '-' | '_' | '.' | '~' | ':' | '/' => {
-                encoded.push(*c as char)
-            }
-            c => encoded.push_str(format!("%{:02X}", c as u32).as_str()),
-        };
-    }
-
-    encoded
-}
-
-pub fn powm(base: &BigUint, exp: &BigUint, modulus: &BigUint) -> BigUint {
-    let mut base = base.clone();
-    let mut exp = exp.clone();
-    let mut result: BigUint = One::one();
-
-    while !exp.is_zero() {
-        if exp.is_odd() {
-            result = result.mul(&base).rem(modulus);
-        }
-        exp = exp.shr(1);
-        base = (&base).mul(&base).rem(modulus);
-    }
-
-    result
-}
-
-pub trait ReadSeek: ::std::io::Read + ::std::io::Seek {}
-impl<T: ::std::io::Read + ::std::io::Seek> ReadSeek for T {}
 
 pub trait Seq {
     fn next(&self) -> Self;