76 lines
1.9 KiB
Rust
76 lines
1.9 KiB
Rust
//! The `hash` module provides functions for creating SHA-256 hashes.
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use bs58;
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use generic_array::typenum::U32;
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use generic_array::GenericArray;
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use sha2::{Digest, Sha256};
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use std::fmt;
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#[derive(Serialize, Deserialize, Clone, Copy, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
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pub struct Hash(GenericArray<u8, U32>);
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#[derive(Clone, Default)]
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pub struct Hasher {
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hasher: Sha256,
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}
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impl Hasher {
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pub fn hash(&mut self, val: &[u8]) {
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self.hasher.input(val);
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}
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pub fn hashv(&mut self, vals: &[&[u8]]) {
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for val in vals {
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self.hash(val);
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}
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}
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pub fn result(self) -> Hash {
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// At the time of this writing, the sha2 library is stuck on an old version
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// of generic_array (0.9.0). Decouple ourselves with a clone to our version.
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Hash(GenericArray::clone_from_slice(
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self.hasher.result().as_slice(),
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))
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}
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}
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impl AsRef<[u8]> for Hash {
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fn as_ref(&self) -> &[u8] {
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&self.0[..]
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}
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}
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impl fmt::Debug for Hash {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", bs58::encode(self.0).into_string())
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}
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}
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impl fmt::Display for Hash {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{}", bs58::encode(self.0).into_string())
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}
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}
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impl Hash {
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pub fn new(hash_slice: &[u8]) -> Self {
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Hash(GenericArray::clone_from_slice(&hash_slice))
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}
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}
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/// Return a Sha256 hash for the given data.
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pub fn hashv(vals: &[&[u8]]) -> Hash {
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let mut hasher = Hasher::default();
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hasher.hashv(vals);
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hasher.result()
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}
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/// Return a Sha256 hash for the given data.
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pub fn hash(val: &[u8]) -> Hash {
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hashv(&[val])
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}
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/// Return the hash of the given hash extended with the given value.
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pub fn extend_and_hash(id: &Hash, val: &[u8]) -> Hash {
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let mut hash_data = id.as_ref().to_vec();
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hash_data.extend_from_slice(val);
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hash(&hash_data)
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}
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