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hash.go
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// Note: original file modified
// Copyright © 2019 Weald Technology Trading
// 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 merkle
import (
"hash"
"lukechampine.com/blake3"
)
// HashType defines the interface that must be supplied by hash functions
type HashType interface {
// Hash calculates the hash of a given input
Hash([]byte, []byte) []byte
// HashLength provides the length of the hash
HashLength() int
}
type BLAKE3 struct {
hasher hash.Hash
}
// New creates a new SHA256 hashing method
func NewBLAKE3() *BLAKE3 {
h := blake3.New(32, nil)
return &BLAKE3{hasher: h}
}
// HashLength returns the length of hashes generated by Hash() in bytes
func (h *BLAKE3) HashLength() int {
return h.hasher.Size()
}
// Hash generates a BLAKE3 hash from input byte arrays
func (h *BLAKE3) Hash(a, b []byte) []byte {
h.hasher.Reset()
h.hasher.Write(a)
h.hasher.Write(b)
return h.hasher.Sum(nil)
}