diff --git a/beacon_chain/utils/bls/src/lib.rs b/beacon_chain/utils/bls/src/lib.rs
index dcd2a9d29..0c69a9865 100644
--- a/beacon_chain/utils/bls/src/lib.rs
+++ b/beacon_chain/utils/bls/src/lib.rs
@@ -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)
 }
diff --git a/beacon_chain/utils/hashing/Cargo.toml b/beacon_chain/utils/hashing/Cargo.toml
index 36cbc41ef..8bed7adaf 100644
--- a/beacon_chain/utils/hashing/Cargo.toml
+++ b/beacon_chain/utils/hashing/Cargo.toml
@@ -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"
\ No newline at end of file
diff --git a/beacon_chain/utils/hashing/src/lib.rs b/beacon_chain/utils/hashing/src/lib.rs
index 7c349e39d..40dddb7a5 100644
--- a/beacon_chain/utils/hashing/src/lib.rs
+++ b/beacon_chain/utils/hashing/src/lib.rs
@@ -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
 }