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Updates the hash function used to Keccak-256

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This commit is contained in:
Alex Stokes 2018-12-11 14:47:05 -08:00
parent 7808835f1c
commit 97bd323a52
No known key found for this signature in database
GPG Key ID: 51CE1721B245C086
3 changed files with 11 additions and 17 deletions
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6
beacon_chain/utils/bls/src/lib.rs
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@ -10,16 +10,16 @@ pub use self::bls_aggregates::Signature;
pub const BLS_AGG_SIG_BYTE_SIZE: usize = 97;
use hashing::proof_of_possession_hash;
use hashing::canonical_hash;
/// For some signature and public key, ensure that the signature message was the public key and it
/// was signed by the secret key that corresponds to that public key.
pub fn verify_proof_of_possession(sig: &Signature, pubkey: &PublicKey) -> bool {
let hash = proof_of_possession_hash(&pubkey.as_bytes());
let hash = canonical_hash(&pubkey.as_bytes());
sig.verify_hashed(&hash, &pubkey)
}
pub fn create_proof_of_possession(keypair: &Keypair) -> Signature {
let hash = proof_of_possession_hash(&keypair.pk.as_bytes());
let hash = canonical_hash(&keypair.pk.as_bytes());
Signature::new_hashed(&hash, &keypair.sk)
}

2
beacon_chain/utils/hashing/Cargo.toml
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@ -4,4 +4,4 @@ version = "0.1.0"
authors = ["Paul Hauner <paul@paulhauner.com>"]
[dependencies]
blake2-rfc = "0.2.18"
tiny-keccak = "1.4.2"

20
beacon_chain/utils/hashing/src/lib.rs
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@ -1,17 +1,11 @@
extern crate blake2_rfc;
extern crate tiny_keccak;
use self::blake2_rfc::blake2b::blake2b;
use tiny_keccak::Keccak;
pub fn canonical_hash(input: &[u8]) -> Vec<u8> {
let result = blake2b(64, &[], input);
result.as_bytes()[0..32].to_vec()
}
pub fn proof_of_possession_hash(input: &[u8]) -> Vec<u8> {
let result = blake2b(64, &[], input);
let mut hash = result.as_bytes()[32..64].to_vec();
// TODO: this padding is not part of the spec, it is required otherwise Milagro will panic.
// We should either drop the padding or ensure the padding is in the spec.
hash.append(&mut vec![0; 18]);
hash
let mut keccak = Keccak::new_keccak256();
keccak.update(input);
let mut result = Vec::with_capacity(32);
keccak.finalize(result.as_mut_slice());
result
}