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enccc_example.go
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/
enccc_example.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package main
import (
"fmt"
"github.com/hyperledger/fabric/bccsp"
"github.com/hyperledger/fabric/bccsp/factory"
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/hyperledger/fabric/core/chaincode/shim/ext/entities"
pb "github.com/hyperledger/fabric/protos/peer"
)
const DECKEY = "DECKEY"
const VERKEY = "VERKEY"
const ENCKEY = "ENCKEY"
const SIGKEY = "SIGKEY"
const IV = "IV"
// EncCC example simple Chaincode implementation of a chaincode that uses encryption/signatures
type EncCC struct {
bccspInst bccsp.BCCSP
}
// Init does nothing for this cc
func (t *EncCC) Init(stub shim.ChaincodeStubInterface) pb.Response {
return shim.Success(nil)
}
// Encrypter exposes how to write state to the ledger after having
// encrypted it with an AES 256 bit key that has been provided to the chaincode through the
// transient field
func (t *EncCC) Encrypter(stub shim.ChaincodeStubInterface, args []string, encKey, IV []byte) pb.Response {
// create the encrypter entity - we give it an ID, the bccsp instance, the key and (optionally) the IV
ent, err := entities.NewAES256EncrypterEntity("ID", t.bccspInst, encKey, IV)
if err != nil {
return shim.Error(fmt.Sprintf("entities.NewAES256EncrypterEntity failed, err %s", err))
}
if len(args) != 2 {
return shim.Error("Expected 2 parameters to function Encrypter")
}
key := args[0]
cleartextValue := []byte(args[1])
// here, we encrypt cleartextValue and assign it to key
err = encryptAndPutState(stub, ent, key, cleartextValue)
if err != nil {
return shim.Error(fmt.Sprintf("encryptAndPutState failed, err %+v", err))
}
return shim.Success(nil)
}
// Decrypter exposes how to read from the ledger and decrypt using an AES 256
// bit key that has been provided to the chaincode through the transient field.
func (t *EncCC) Decrypter(stub shim.ChaincodeStubInterface, args []string, decKey, IV []byte) pb.Response {
// create the encrypter entity - we give it an ID, the bccsp instance, the key and (optionally) the IV
ent, err := entities.NewAES256EncrypterEntity("ID", t.bccspInst, decKey, IV)
if err != nil {
return shim.Error(fmt.Sprintf("entities.NewAES256EncrypterEntity failed, err %s", err))
}
if len(args) != 1 {
return shim.Error("Expected 1 parameters to function Decrypter")
}
key := args[0]
// here we decrypt the state associated to key
cleartextValue, err := getStateAndDecrypt(stub, ent, key)
if err != nil {
return shim.Error(fmt.Sprintf("getStateAndDecrypt failed, err %+v", err))
}
// here we return the decrypted value as a result
return shim.Success(cleartextValue)
}
// EncrypterSigner exposes how to write state to the ledger after having received keys for
// encrypting (AES 256 bit key) and signing (X9.62/SECG curve over a 256 bit prime field) that has been provided to the chaincode through the
// transient field
func (t *EncCC) EncrypterSigner(stub shim.ChaincodeStubInterface, args []string, encKey, sigKey []byte) pb.Response {
// create the encrypter/signer entity - we give it an ID, the bccsp instance and the keys
ent, err := entities.NewAES256EncrypterECDSASignerEntity("ID", t.bccspInst, encKey, sigKey)
if err != nil {
return shim.Error(fmt.Sprintf("entities.NewAES256EncrypterEntity failed, err %s", err))
}
if len(args) != 2 {
return shim.Error("Expected 2 parameters to function EncrypterSigner")
}
key := args[0]
cleartextValue := []byte(args[1])
// here, we sign cleartextValue, encrypt it and assign it to key
err = signEncryptAndPutState(stub, ent, key, cleartextValue)
if err != nil {
return shim.Error(fmt.Sprintf("signEncryptAndPutState failed, err %+v", err))
}
return shim.Success(nil)
}
// DecrypterVerify exposes how to get state to the ledger after having received keys for
// decrypting (AES 256 bit key) and verifying (X9.62/SECG curve over a 256 bit prime field) that has been provided to the chaincode through the
// transient field
func (t *EncCC) DecrypterVerify(stub shim.ChaincodeStubInterface, args []string, decKey, verKey []byte) pb.Response {
// create the decrypter/verify entity - we give it an ID, the bccsp instance and the keys
ent, err := entities.NewAES256EncrypterECDSASignerEntity("ID", t.bccspInst, decKey, verKey)
if err != nil {
return shim.Error(fmt.Sprintf("entities.NewAES256DecrypterEntity failed, err %s", err))
}
if len(args) != 1 {
return shim.Error("Expected 1 parameters to function DecrypterVerify")
}
key := args[0]
// here we decrypt the state associated to key and verify it
cleartextValue, err := getStateDecryptAndVerify(stub, ent, key)
if err != nil {
return shim.Error(fmt.Sprintf("getStateDecryptAndVerify failed, err %+v", err))
}
// here we return the decrypted and verified value as a result
return shim.Success(cleartextValue)
}
// RangeDecrypter shows how range queries may be satisfied by using the decrypter
// entity directly to decrypt previously encrypted key-value pairs
func (t *EncCC) RangeDecrypter(stub shim.ChaincodeStubInterface, decKey []byte) pb.Response {
// create the encrypter entity - we give it an ID, the bccsp instance and the key
ent, err := entities.NewAES256EncrypterEntity("ID", t.bccspInst, decKey, nil)
if err != nil {
return shim.Error(fmt.Sprintf("entities.NewAES256EncrypterEntity failed, err %s", err))
}
bytes, err := getStateByRangeAndDecrypt(stub, ent, "", "")
if err != nil {
return shim.Error(fmt.Sprintf("getStateByRangeAndDecrypt failed, err %+v", err))
}
return shim.Success(bytes)
}
// Invoke for this chaincode exposes functions to ENCRYPT, DECRYPT transactional
// data. It also supports an example to ENCRYPT and SIGN and DECRYPT and
// VERIFY. The Initialization Vector (IV) can be passed in as a parm to
// ensure peers have deterministic data.
func (t *EncCC) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
// get arguments and transient
f, args := stub.GetFunctionAndParameters()
tMap, err := stub.GetTransient()
if err != nil {
return shim.Error(fmt.Sprintf("Could not retrieve transient, err %s", err))
}
switch f {
case "ENCRYPT":
// make sure there's a key in transient - the assumption is that
// it's associated to the string "ENCKEY"
if _, in := tMap[ENCKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient encryption key %s", ENCKEY))
}
return t.Encrypter(stub, args[0:], tMap[ENCKEY], tMap[IV])
case "DECRYPT":
// make sure there's a key in transient - the assumption is that
// it's associated to the string "DECKEY"
if _, in := tMap[DECKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient decryption key %s", DECKEY))
}
return t.Decrypter(stub, args[0:], tMap[DECKEY], tMap[IV])
case "ENCRYPTSIGN":
// make sure keys are there in the transient map - the assumption is that they
// are associated to the string "ENCKEY" and "SIGKEY"
if _, in := tMap[ENCKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient key %s", ENCKEY))
} else if _, in := tMap[SIGKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient key %s", SIGKEY))
}
return t.EncrypterSigner(stub, args[0:], tMap[ENCKEY], tMap[SIGKEY])
case "DECRYPTVERIFY":
// make sure keys are there in the transient map - the assumption is that they
// are associated to the string "DECKEY" and "VERKEY"
if _, in := tMap[DECKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient key %s", DECKEY))
} else if _, in := tMap[VERKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient key %s", VERKEY))
}
return t.DecrypterVerify(stub, args[0:], tMap[DECKEY], tMap[VERKEY])
case "RANGEQUERY":
// make sure there's a key in transient - the assumption is that
// it's associated to the string "ENCKEY"
if _, in := tMap[DECKEY]; !in {
return shim.Error(fmt.Sprintf("Expected transient key %s", DECKEY))
}
return t.RangeDecrypter(stub, tMap[DECKEY])
default:
return shim.Error(fmt.Sprintf("Unsupported function %s", f))
}
}
func main() {
factory.InitFactories(nil)
err := shim.Start(&EncCC{factory.GetDefault()})
if err != nil {
fmt.Printf("Error starting EncCC chaincode: %s", err)
}
}