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hash.go
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hash.go
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/*
Copyright IBM Corp. 2016 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 ecdsa
import (
"crypto/sha256"
"crypto/sha512"
"fmt"
"hash"
"golang.org/x/crypto/sha3"
"github.com/hyperledger/fabric/core/crypto/primitives"
)
func getHashSHA2(bitsize int) (hash.Hash, error) {
switch bitsize {
case 224:
return sha256.New224(), nil
case 256:
return sha256.New(), nil
case 384:
return sha512.New384(), nil
case 512:
return sha512.New(), nil
case 521:
return sha512.New(), nil
default:
return nil, fmt.Errorf("Invalid bitsize. It was [%d]. Expected [224, 256, 384, 512, 521]", bitsize)
}
}
func getHashSHA3(bitsize int) (hash.Hash, error) {
switch bitsize {
case 224:
return sha3.New224(), nil
case 256:
return sha3.New256(), nil
case 384:
return sha3.New384(), nil
case 512:
return sha3.New512(), nil
case 521:
return sha3.New512(), nil
default:
return nil, fmt.Errorf("Invalid bitsize. It was [%d]. Expected [224, 256, 384, 512, 521]", bitsize)
}
}
func computeHash(msg []byte, bitsize int) ([]byte, error) {
var hash hash.Hash
var err error
switch primitives.GetHashAlgorithm() {
case "SHA2":
hash, err = getHashSHA2(bitsize)
case "SHA3":
hash, err = getHashSHA3(bitsize)
default:
return nil, fmt.Errorf("Invalid hash algorithm %s", primitives.GetHashAlgorithm())
}
if err != nil {
return nil, err
}
hash.Write(msg)
return hash.Sum(nil), nil
}