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use hash::Algorithm;
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Proof<T: Eq + Clone + AsRef<[u8]>> {
lemma: Vec<T>,
path: Vec<bool>,
}
impl<T: Eq + Clone + AsRef<[u8]>> Proof<T> {
pub fn new(hash: Vec<T>, path: Vec<bool>) -> Proof<T> {
assert!(hash.len() > 2);
assert_eq!(hash.len() - 2, path.len());
Proof { lemma: hash, path }
}
pub fn item(&self) -> T {
self.lemma.first().unwrap().clone()
}
pub fn root(&self) -> T {
self.lemma.last().unwrap().clone()
}
pub fn validate<A: Algorithm<T>>(&self) -> bool {
let size = self.lemma.len();
if size < 2 {
return false;
}
let mut h = self.item();
let mut a = A::default();
for i in 1..size - 1 {
a.reset();
h = if self.path[i - 1] {
a.node(h, self.lemma[i].clone())
} else {
a.node(self.lemma[i].clone(), h)
};
}
h == self.root()
}
}