sapling_crypto_ce/
util.rs

1use blake2_rfc::blake2b::Blake2b;
2use blake2_rfc::blake2s::Blake2s;
3use sha2::{Sha256, Digest};
4
5use jubjub::{JubjubEngine, ToUniform};
6
7pub fn hash_to_scalar<E: JubjubEngine>(persona: &[u8], a: &[u8], b: &[u8]) -> E::Fs {
8    let mut hasher = Blake2b::with_params(64, &[], &[], persona);
9    hasher.update(a);
10    hasher.update(b);
11    let ret = hasher.finalize();
12    E::Fs::to_uniform(ret.as_ref())
13}
14
15pub fn hash_to_scalar_s<E: JubjubEngine>(persona: &[u8], a: &[u8], b: &[u8]) -> E::Fs {
16    let mut hasher = Blake2s::with_params(32, &[], &[], persona);
17    hasher.update(a);
18    hasher.update(b);
19    let ret = hasher.finalize();
20    E::Fs::to_uniform_32(ret.as_ref())
21}
22
23pub fn sha256_hash_to_scalar<E: JubjubEngine>(persona: &[u8], a: &[u8], b: &[u8]) -> E::Fs {
24    let mut hasher = Sha256::new();
25    hasher.input(persona);
26    hasher.input(a);
27    hasher.input(b);
28    let result = hasher.result();
29    E::Fs::to_uniform_32(result.as_slice())
30}
sapling_crypto_ce/util.rs

sapling_crypto_ce/
util.rs
