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blake2b.go
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blake2b.go
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// Go Substrate RPC Client (GSRPC) provides APIs and types around Polkadot and any Substrate-based chain RPC calls
//
// Copyright 2019 Centrifuge GmbH
//
// 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 hash
import (
"hash"
"golang.org/x/crypto/blake2b"
)
type blake2b128Concat struct {
hasher hash.Hash
data []byte
}
// NewBlake2b128Concat returns an instance of blake2b concat hasher
func NewBlake2b128Concat(k []byte) (hash.Hash, error) {
h, err := blake2b.New(16, k)
if err != nil {
return nil, err
}
return &blake2b128Concat{hasher: h, data: k}, nil
}
// Write (via the embedded io.Writer interface) adds more data to the running hash.
func (bc *blake2b128Concat) Write(p []byte) (n int, err error) {
bc.data = append(bc.data, p...)
return bc.hasher.Write(p)
}
// Sum appends the current hash to b and returns the resulting slice.
// It does not change the underlying hash state.
func (bc *blake2b128Concat) Sum(b []byte) []byte {
return append(bc.hasher.Sum(b), bc.data...)
}
// Reset resets the Hash to its initial state.
func (bc *blake2b128Concat) Reset() {
bc.data = nil
bc.hasher.Reset()
}
// Size returns the number of bytes Sum will return.
func (bc *blake2b128Concat) Size() int {
return len(bc.Sum(nil))
}
// BlockSize returns the hash's underlying block size.
// The Write method must be able to accept any amount
// of data, but it may operate more efficiently if all writes
// are a multiple of the block size.
func (bc *blake2b128Concat) BlockSize() int {
return bc.hasher.BlockSize()
}
// NewBlake2b128 returns blake2b-128 hasher
func NewBlake2b128(k []byte) (hash.Hash, error) {
return blake2b.New(16, k)
}
// NewBlake2b256 returns blake2b-256 hasher
func NewBlake2b256(k []byte) (hash.Hash, error) {
return blake2b.New256(k)
}