76 lines
2.2 KiB
Go
76 lines
2.2 KiB
Go
/*
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Copyright IBM Corp. 2016 All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sw
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"fmt"
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"github.com/hyperledger/fabric/bccsp"
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"github.com/hyperledger/fabric/bccsp/utils"
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)
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func signECDSA(k *ecdsa.PrivateKey, digest []byte, opts bccsp.SignerOpts) ([]byte, error) {
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r, s, err := ecdsa.Sign(rand.Reader, k, digest)
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if err != nil {
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return nil, err
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}
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s, err = utils.ToLowS(&k.PublicKey, s)
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if err != nil {
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return nil, err
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}
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return utils.MarshalECDSASignature(r, s)
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}
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func verifyECDSA(k *ecdsa.PublicKey, signature, digest []byte, opts bccsp.SignerOpts) (bool, error) {
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r, s, err := utils.UnmarshalECDSASignature(signature)
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if err != nil {
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return false, fmt.Errorf("Failed unmashalling signature [%s]", err)
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}
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lowS, err := utils.IsLowS(k, s)
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if err != nil {
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return false, err
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}
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if !lowS {
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return false, fmt.Errorf("Invalid S. Must be smaller than half the order [%s][%s].", s, utils.GetCurveHalfOrdersAt(k.Curve))
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}
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return ecdsa.Verify(k, digest, r, s), nil
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}
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type ecdsaSigner struct{}
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func (s *ecdsaSigner) Sign(k bccsp.Key, digest []byte, opts bccsp.SignerOpts) ([]byte, error) {
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return signECDSA(k.(*ecdsaPrivateKey).privKey, digest, opts)
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}
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type ecdsaPrivateKeyVerifier struct{}
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func (v *ecdsaPrivateKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (bool, error) {
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return verifyECDSA(&(k.(*ecdsaPrivateKey).privKey.PublicKey), signature, digest, opts)
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}
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type ecdsaPublicKeyKeyVerifier struct{}
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func (v *ecdsaPublicKeyKeyVerifier) Verify(k bccsp.Key, signature, digest []byte, opts bccsp.SignerOpts) (bool, error) {
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return verifyECDSA(k.(*ecdsaPublicKey).pubKey, signature, digest, opts)
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}
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