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signingmgr.go
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signingmgr.go
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/*
Copyright SecureKey Technologies Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package signingmgr
import (
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/core"
"github.com/hyperledger/fabric-sdk-go/pkg/core/cryptosuite"
"github.com/pkg/errors"
)
// SigningManager is used for signing objects with private key
type SigningManager struct {
cryptoProvider core.CryptoSuite
hashOpts core.HashOpts
signerOpts core.SignerOpts
}
// New Constructor for a signing manager.
// @param {BCCSP} cryptoProvider - crypto provider
// @param {Config} config - configuration provider
// @returns {SigningManager} new signing manager
func New(cryptoProvider core.CryptoSuite) (*SigningManager, error) {
return &SigningManager{cryptoProvider: cryptoProvider, hashOpts: cryptosuite.GetSHAOpts()}, nil
}
// Sign will sign the given object using provided key
func (mgr *SigningManager) Sign(object []byte, key core.Key) ([]byte, error) {
if len(object) == 0 {
return nil, errors.New("object (to sign) required")
}
if key == nil {
return nil, errors.New("key (for signing) required")
}
digest, err := mgr.cryptoProvider.Hash(object, mgr.hashOpts)
if err != nil {
return nil, err
}
signature, err := mgr.cryptoProvider.Sign(key, digest, mgr.signerOpts)
if err != nil {
return nil, err
}
return signature, nil
}