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vrf.go
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vrf.go
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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package vrf defines the interface to a verifiable random function.
package vrf
import (
"crypto"
)
// A VRF is a pseudorandom function f_k from a secret key k, such that that
// knowledge of k not only enables one to evaluate f_k at for any message m,
// but also to provide an NP-proof that the value f_k(m) is indeed correct
// without compromising the unpredictability of f_k for any m' != m.
// http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=814584
// PrivateKey supports evaluating the VRF function.
type PrivateKey interface {
// Evaluate returns the output of H(f_k(m)) and its proof.
Evaluate(m []byte) (index [32]byte, proof []byte)
// Public returns the corresponding public key.
Public() crypto.PublicKey
}
// PublicKey supports verifying output from the VRF function.
type PublicKey interface {
// ProofToHash verifies the NP-proof supplied by Proof and outputs Index.
ProofToHash(m, proof []byte) (index [32]byte, err error)
// Serialize serialize the public key into bytes
Serialize() []byte
// Deserialize de-serialize bytes into public key
Deserialize([]byte)
}