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Generate uniformly random scalar w/ Fr::from_bytes_wide() 

Which reduces mod r always.
This commit is contained in:
Deirdre Connolly 2020-07-28 17:31:41 -04:00 committed by Deirdre Connolly
parent 8f15ed8140
commit e22afa3c8f
1 changed files with 3 additions and 2 deletions
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5
zebra-chain/src/commitments/sapling.rs
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@ -30,9 +30,10 @@ pub fn generate_trapdoor<T>(csprng: &mut T) -> jubjub::Fr
where where
T: RngCore + CryptoRng, T: RngCore + CryptoRng,
{ {
let mut bytes = [0u8; 32]; let mut bytes = [0u8; 64];
csprng.fill_bytes(&mut bytes); csprng.fill_bytes(&mut bytes);
jubjub::Fr::from_bytes(&bytes).unwrap() // Fr::from_bytes_wide() reduces the input modulo r via Fr::from_u512()
jubjub::Fr::from_bytes_wide(&bytes)
} }
/// "...an algebraic hash function with collision resistance (for /// "...an algebraic hash function with collision resistance (for