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//! A collection of utility submodules
/// Encoding module
pub mod encoding {
use base64;
use std::fmt::Write;
/// Encode a piece of arbitary data into a bse64 string
pub fn base64_encode(data: &Vec<u8>) -> String {
return base64::encode(data);
}
/// Decode a base64 string into arbitrary data
pub fn base64_decode(data: &String) -> Vec<u8> {
return base64::decode(data).unwrap();
}
/// Simply encode a byte-string as hexadecimal symbols
pub fn encode_hex(data: &str) -> String {
let mut s = String::new();
for &byte in data.as_bytes() {
write!(&mut s, "{:X}", byte).expect("Unable to HEX encode!");
}
return s;
}
}
/// A hashing utility module
pub mod hashing {
use blake2::Blake2s;
use blake2::digest::{Input, VariableOutput};
const BLAKE_16_LENGTH: usize = 16;
/// Hash a value with blake2
pub fn blake2(data: &str, salt: &str) -> [u8; BLAKE_16_LENGTH] {
let mut hasher = match Blake2s::new(BLAKE_16_LENGTH) {
Ok(res) => res,
Err(some) => panic!(some),
};
let to_hash = format!("{}{}", data, salt);
hasher.process(to_hash.as_bytes());
let mut buffer = [0u8; BLAKE_16_LENGTH];
match hasher.variable_result(&mut buffer) {
Ok(res) => res,
Err(e) => panic!(e),
};
return buffer;
}
}
/// Random number utility module for lockchain
///
/// Provides stateless secure random number and byte generation
pub mod random {
use rand::{thread_rng, Rng};
/// Generate a random number with an upper bound
pub fn number(bound: u64) -> u64 {
return thread_rng().next_u64() % bound;
}
/// Generate a sequence of random bytes that are returned
/// as a vector.
///
/// Can at most allocate 2048 bytes at a time
/// FIXME: That shouldn't have a limit!
pub fn bytes(length: usize) -> Vec<u8> {
let mut vec: Vec<u8> = Vec::new();
if length > 2048 {
return vec;
}
let mut random_data = [0u8; 2048];
thread_rng().fill_bytes(&mut random_data);
for i in 0..length {
vec.push(random_data[i]);
}
return vec;
}
}
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