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use serde::{Serializer, Deserializer, Deserialize};
use sha2::{self, Digest};
use std::io::{self, Read};
use store::{b32enc, b32dec};
fn from_base32<'de, D: Deserializer<'de>>(deserializer: D) -> Result<Vec<u8>, D::Error> {
use serde::de::Error;
String::deserialize(deserializer).and_then(|string| {
b32dec(&string).ok_or(Error::custom("b32dec failed"))
})
}
fn to_base32<T: AsRef<[u8]>, S: Serializer>(buffer: &T, serializer: S) -> Result<S::Ok, S::Error> {
serializer.serialize_str(&b32enc(&buffer.as_ref()))
}
#[derive(Clone, Debug, Eq, PartialEq, Deserialize, Serialize)]
pub struct Sha384(
#[serde(deserialize_with = "from_base32", serialize_with = "to_base32")]
Vec<u8>
);
impl Sha384 {
pub fn new<R: Read>(mut input: R) -> io::Result<Sha384> {
let mut hasher = sha2::Sha384::default();
loop {
let mut data = [0; 4096];
let count = input.read(&mut data)?;
if count == 0 {
break;
}
hasher.input(&data[..count]);
}
Ok(Sha384(
hasher.result().as_slice().to_vec()
))
}
pub fn to_base32(&self) -> String {
let key = {
let mut key = [0u8; 48];
key.copy_from_slice(&self.0);
key
};
b32enc(&key)
}
}
#[cfg(test)]
mod tests {
use super::Sha384;
#[test]
fn test_match() {
let a = "Input";
let b = "Input";
let sha_a = Sha384::new(a.as_bytes()).unwrap();
let sha_b = Sha384::new(b.as_bytes()).unwrap();
assert_eq!(sha_a, sha_b);
}
#[test]
fn test_mismatch() {
let a = "Input A";
let b = "Input B";
let sha_a = Sha384::new(a.as_bytes()).unwrap();
let sha_b = Sha384::new(b.as_bytes()).unwrap();
assert_ne!(sha_a, sha_b);
}
}