func (validator *validatorImpl) deepCloneAndDecryptTx1_1(tx *obc.Transaction) (*obc.Transaction, error) { if tx.Nonce == nil || len(tx.Nonce) == 0 { return nil, errors.New("Failed decrypting payload. Invalid nonce.") } // clone tx clone, err := validator.deepCloneTransaction(tx) if err != nil { validator.Errorf("Failed deep cloning [%s].", err.Error()) return nil, err } // Derive root key // client.enrollChainKey is an AES key represented as byte array enrollChainKey := validator.enrollChainKey.([]byte) key := primitives.HMAC(enrollChainKey, clone.Nonce) // validator.log.Infof("Deriving from ", utils.EncodeBase64(validator.peer.node.enrollChainKey)) // validator.log.Infof("Nonce ", utils.EncodeBase64(tx.Nonce)) // validator.log.Infof("Derived key ", utils.EncodeBase64(key)) // validator.log.Infof("Encrypted Payload ", utils.EncodeBase64(tx.EncryptedPayload)) // validator.log.Infof("Encrypted ChaincodeID ", utils.EncodeBase64(tx.EncryptedChaincodeID)) // Decrypt Payload payloadKey := primitives.HMACAESTruncated(key, []byte{1}) payload, err := primitives.CBCPKCS7Decrypt(payloadKey, utils.Clone(clone.Payload)) if err != nil { validator.Errorf("Failed decrypting payload [%s].", err.Error()) return nil, err } clone.Payload = payload // Decrypt ChaincodeID chaincodeIDKey := primitives.HMACAESTruncated(key, []byte{2}) chaincodeID, err := primitives.CBCPKCS7Decrypt(chaincodeIDKey, utils.Clone(clone.ChaincodeID)) if err != nil { validator.Errorf("Failed decrypting chaincode [%s].", err.Error()) return nil, err } clone.ChaincodeID = chaincodeID // Decrypt metadata if len(clone.Metadata) != 0 { metadataKey := primitives.HMACAESTruncated(key, []byte{3}) metadata, err := primitives.CBCPKCS7Decrypt(metadataKey, utils.Clone(clone.Metadata)) if err != nil { validator.Errorf("Failed decrypting metadata [%s].", err.Error()) return nil, err } clone.Metadata = metadata } return clone, nil }
// DecryptQueryResult is used to decrypt the result of a query transaction func (client *clientImpl) DecryptQueryResult(queryTx *obc.Transaction, ct []byte) ([]byte, error) { // Verify that the client is initialized if !client.isInitialized { return nil, utils.ErrNotInitialized } var queryKey []byte switch queryTx.ConfidentialityProtocolVersion { case "1.1": enrollChainKey := client.enrollChainKey.([]byte) queryKey = primitives.HMACAESTruncated(enrollChainKey, append([]byte{6}, queryTx.Nonce...)) // client.log.Info("QUERY Decrypting with key: ", utils.EncodeBase64(queryKey)) break case "1.2": queryKey = primitives.HMACAESTruncated(client.queryStateKey, append([]byte{6}, queryTx.Nonce...)) } if len(ct) <= primitives.NonceSize { return nil, utils.ErrDecrypt } c, err := aes.NewCipher(queryKey) if err != nil { return nil, err } gcm, err := cipher.NewGCM(c) if err != nil { return nil, err } nonce := make([]byte, gcm.NonceSize()) copy(nonce, ct) out, err := gcm.Open(nil, nonce, ct[gcm.NonceSize():], nil) if err != nil { client.error("Failed decrypting query result [%s].", err.Error()) return nil, utils.ErrDecrypt } return out, nil }
func (client *clientImpl) encryptTxVersion1_1(tx *obc.Transaction) error { // client.enrollChainKey is an AES key represented as byte array enrollChainKey := client.enrollChainKey.([]byte) // Derive key txKey := primitives.HMAC(enrollChainKey, tx.Nonce) // client.log.Info("Deriving from :", utils.EncodeBase64(client.node.enrollChainKey)) // client.log.Info("Nonce ", utils.EncodeBase64(tx.Nonce)) // client.log.Info("Derived key ", utils.EncodeBase64(txKey)) // Encrypt Payload payloadKey := primitives.HMACAESTruncated(txKey, []byte{1}) encryptedPayload, err := primitives.CBCPKCS7Encrypt(payloadKey, tx.Payload) if err != nil { return err } tx.Payload = encryptedPayload // Encrypt ChaincodeID chaincodeIDKey := primitives.HMACAESTruncated(txKey, []byte{2}) encryptedChaincodeID, err := primitives.CBCPKCS7Encrypt(chaincodeIDKey, tx.ChaincodeID) if err != nil { return err } tx.ChaincodeID = encryptedChaincodeID // Encrypt Metadata if len(tx.Metadata) != 0 { metadataKey := primitives.HMACAESTruncated(txKey, []byte{3}) encryptedMetadata, err := primitives.CBCPKCS7Encrypt(metadataKey, tx.Metadata) if err != nil { return err } tx.Metadata = encryptedMetadata } return nil }
func (client *clientImpl) encryptTxVersion1_2(tx *obc.Transaction) error { // Create (PK_C,SK_C) pair ccPrivateKey, err := client.eciesSPI.NewPrivateKey(rand.Reader, primitives.GetDefaultCurve()) if err != nil { client.Errorf("Failed generate chaincode keypair: [%s]", err) return err } // Prepare message to the validators var ( stateKey []byte privBytes []byte ) switch tx.Type { case obc.Transaction_CHAINCODE_DEPLOY: // Prepare chaincode stateKey and privateKey stateKey, err = primitives.GenAESKey() if err != nil { client.Errorf("Failed creating state key: [%s]", err) return err } privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey) if err != nil { client.Errorf("Failed serializing chaincode key: [%s]", err) return err } break case obc.Transaction_CHAINCODE_QUERY: // Prepare chaincode stateKey and privateKey stateKey = primitives.HMACAESTruncated(client.queryStateKey, append([]byte{6}, tx.Nonce...)) privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey) if err != nil { client.Errorf("Failed serializing chaincode key: [%s]", err) return err } break case obc.Transaction_CHAINCODE_INVOKE: // Prepare chaincode stateKey and privateKey stateKey = make([]byte, 0) privBytes, err = client.eciesSPI.SerializePrivateKey(ccPrivateKey) if err != nil { client.Errorf("Failed serializing chaincode key: [%s]", err) return err } break } // Encrypt message to the validators cipher, err := client.eciesSPI.NewAsymmetricCipherFromPublicKey(client.chainPublicKey) if err != nil { client.Errorf("Failed creating new encryption scheme: [%s]", err) return err } msgToValidators, err := asn1.Marshal(chainCodeValidatorMessage1_2{privBytes, stateKey}) if err != nil { client.Errorf("Failed preparing message to the validators: [%s]", err) return err } encMsgToValidators, err := cipher.Process(msgToValidators) if err != nil { client.Errorf("Failed encrypting message to the validators: [%s]", err) return err } tx.ToValidators = encMsgToValidators // Encrypt the rest of the fields // Init with chainccode pk cipher, err = client.eciesSPI.NewAsymmetricCipherFromPublicKey(ccPrivateKey.GetPublicKey()) if err != nil { client.Errorf("Failed initiliazing encryption scheme: [%s]", err) return err } // Encrypt chaincodeID using pkC encryptedChaincodeID, err := cipher.Process(tx.ChaincodeID) if err != nil { client.Errorf("Failed encrypting chaincodeID: [%s]", err) return err } tx.ChaincodeID = encryptedChaincodeID // Encrypt payload using pkC encryptedPayload, err := cipher.Process(tx.Payload) if err != nil { client.Errorf("Failed encrypting payload: [%s]", err) return err } tx.Payload = encryptedPayload // Encrypt metadata using pkC if len(tx.Metadata) != 0 { encryptedMetadata, err := cipher.Process(tx.Metadata) if err != nil { client.Errorf("Failed encrypting metadata: [%s]", err) return err } tx.Metadata = encryptedMetadata } return nil }
func (client *clientImpl) getTCertsFromTCA(num int) error { client.debug("Get [%d] certificates from the TCA...", num) // Contact the TCA TCertOwnerKDFKey, certDERs, err := client.callTCACreateCertificateSet(num) if err != nil { client.debug("Failed contacting TCA [%s].", err.Error()) return err } // client.debug("TCertOwnerKDFKey [%s].", utils.EncodeBase64(TCertOwnerKDFKey)) // Store TCertOwnerKDFKey and checks that every time it is always the same key if client.tCertOwnerKDFKey != nil { // Check that the keys are the same equal := bytes.Equal(client.tCertOwnerKDFKey, TCertOwnerKDFKey) if !equal { return errors.New("Failed reciving kdf key from TCA. The keys are different.") } } else { client.tCertOwnerKDFKey = TCertOwnerKDFKey // TODO: handle this situation more carefully if err := client.storeTCertOwnerKDFKey(); err != nil { client.error("Failed storing TCertOwnerKDFKey [%s].", err.Error()) return err } } // Validate the Certificates obtained TCertOwnerEncryptKey := primitives.HMACAESTruncated(client.tCertOwnerKDFKey, []byte{1}) ExpansionKey := primitives.HMAC(client.tCertOwnerKDFKey, []byte{2}) j := 0 for i := 0; i < num; i++ { // DER to x509 x509Cert, err := utils.DERToX509Certificate(certDERs[i].Cert) if err != nil { client.debug("Failed parsing certificate [% x]: [%s].", certDERs[i].Cert, err) continue } // Handle Critical Extenstion TCertEncTCertIndex tCertIndexCT, err := utils.GetCriticalExtension(x509Cert, utils.TCertEncTCertIndex) if err != nil { client.error("Failed getting extension TCERT_ENC_TCERTINDEX [% x]: [%s].", err) continue } // Verify certificate against root if _, err := utils.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil { client.warning("Warning verifing certificate [%s].", err.Error()) continue } // Verify public key // 384-bit ExpansionValue = HMAC(Expansion_Key, TCertIndex) // Let TCertIndex = Timestamp, RandValue, 1,2,… // Timestamp assigned, RandValue assigned and counter reinitialized to 1 per batch // Decrypt ct to TCertIndex (TODO: || EnrollPub_Key || EnrollID ?) pt, err := primitives.CBCPKCS7Decrypt(TCertOwnerEncryptKey, tCertIndexCT) if err != nil { client.error("Failed decrypting extension TCERT_ENC_TCERTINDEX [%s].", err.Error()) continue } // Compute ExpansionValue based on TCertIndex TCertIndex := pt // TCertIndex := []byte(strconv.Itoa(i)) client.debug("TCertIndex: [% x].", TCertIndex) mac := hmac.New(primitives.NewHash, ExpansionKey) mac.Write(TCertIndex) ExpansionValue := mac.Sum(nil) // Derive tpk and tsk accordingly to ExapansionValue from enrollment pk,sk // Computable by TCA / Auditor: TCertPub_Key = EnrollPub_Key + ExpansionValue G // using elliptic curve point addition per NIST FIPS PUB 186-4- specified P-384 // Compute temporary secret key tempSK := &ecdsa.PrivateKey{ PublicKey: ecdsa.PublicKey{ Curve: client.enrollPrivKey.Curve, X: new(big.Int), Y: new(big.Int), }, D: new(big.Int), } var k = new(big.Int).SetBytes(ExpansionValue) var one = new(big.Int).SetInt64(1) n := new(big.Int).Sub(client.enrollPrivKey.Params().N, one) k.Mod(k, n) k.Add(k, one) tempSK.D.Add(client.enrollPrivKey.D, k) tempSK.D.Mod(tempSK.D, client.enrollPrivKey.PublicKey.Params().N) // Compute temporary public key tempX, tempY := client.enrollPrivKey.PublicKey.ScalarBaseMult(k.Bytes()) tempSK.PublicKey.X, tempSK.PublicKey.Y = tempSK.PublicKey.Add( client.enrollPrivKey.PublicKey.X, client.enrollPrivKey.PublicKey.Y, tempX, tempY, ) // Verify temporary public key is a valid point on the reference curve isOn := tempSK.Curve.IsOnCurve(tempSK.PublicKey.X, tempSK.PublicKey.Y) if !isOn { client.error("Failed temporary public key IsOnCurve check.") continue } // Check that the derived public key is the same as the one in the certificate certPK := x509Cert.PublicKey.(*ecdsa.PublicKey) if certPK.X.Cmp(tempSK.PublicKey.X) != 0 { client.error("Derived public key is different on X") continue } if certPK.Y.Cmp(tempSK.PublicKey.Y) != 0 { client.error("Derived public key is different on Y") continue } // Verify the signing capability of tempSK err = primitives.VerifySignCapability(tempSK, x509Cert.PublicKey) if err != nil { client.error("Failed verifing signing capability [%s].", err.Error()) continue } // Marshall certificate and secret key to be stored in the database if err != nil { client.error("Failed marshalling private key [%s].", err.Error()) continue } if err := utils.CheckCertPKAgainstSK(x509Cert, interface{}(tempSK)); err != nil { client.error("Failed checking TCA cert PK against private key [%s].", err.Error()) continue } client.debug("Sub index [%d]", j) j++ client.debug("Certificate [%d] validated.", i) client.tCertPool.AddTCert(&tCertImpl{client, x509Cert, tempSK}) } if j == 0 { client.error("No valid TCert was sent") return errors.New("No valid TCert was sent.") } return nil }
func (client *clientImpl) getTCertFromDER(der []byte) (tCert tCert, err error) { if client.tCertOwnerKDFKey == nil { return nil, fmt.Errorf("KDF key not initialized yet") } TCertOwnerEncryptKey := primitives.HMACAESTruncated(client.tCertOwnerKDFKey, []byte{1}) ExpansionKey := primitives.HMAC(client.tCertOwnerKDFKey, []byte{2}) // DER to x509 x509Cert, err := utils.DERToX509Certificate(der) if err != nil { client.debug("Failed parsing certificate [% x]: [%s].", der, err) return } // Handle Critical Extenstion TCertEncTCertIndex tCertIndexCT, err := utils.GetCriticalExtension(x509Cert, utils.TCertEncTCertIndex) if err != nil { client.error("Failed getting extension TCERT_ENC_TCERTINDEX [%s].", err.Error()) return } // Verify certificate against root if _, err = utils.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil { client.warning("Warning verifing certificate [%s].", err.Error()) return } // Verify public key // 384-bit ExpansionValue = HMAC(Expansion_Key, TCertIndex) // Let TCertIndex = Timestamp, RandValue, 1,2,… // Timestamp assigned, RandValue assigned and counter reinitialized to 1 per batch // Decrypt ct to TCertIndex (TODO: || EnrollPub_Key || EnrollID ?) pt, err := primitives.CBCPKCS7Decrypt(TCertOwnerEncryptKey, tCertIndexCT) if err != nil { client.error("Failed decrypting extension TCERT_ENC_TCERTINDEX [%s].", err.Error()) return } // Compute ExpansionValue based on TCertIndex TCertIndex := pt // TCertIndex := []byte(strconv.Itoa(i)) client.debug("TCertIndex: [% x].", TCertIndex) mac := hmac.New(primitives.NewHash, ExpansionKey) mac.Write(TCertIndex) ExpansionValue := mac.Sum(nil) // Derive tpk and tsk accordingly to ExapansionValue from enrollment pk,sk // Computable by TCA / Auditor: TCertPub_Key = EnrollPub_Key + ExpansionValue G // using elliptic curve point addition per NIST FIPS PUB 186-4- specified P-384 // Compute temporary secret key tempSK := &ecdsa.PrivateKey{ PublicKey: ecdsa.PublicKey{ Curve: client.enrollPrivKey.Curve, X: new(big.Int), Y: new(big.Int), }, D: new(big.Int), } var k = new(big.Int).SetBytes(ExpansionValue) var one = new(big.Int).SetInt64(1) n := new(big.Int).Sub(client.enrollPrivKey.Params().N, one) k.Mod(k, n) k.Add(k, one) tempSK.D.Add(client.enrollPrivKey.D, k) tempSK.D.Mod(tempSK.D, client.enrollPrivKey.PublicKey.Params().N) // Compute temporary public key tempX, tempY := client.enrollPrivKey.PublicKey.ScalarBaseMult(k.Bytes()) tempSK.PublicKey.X, tempSK.PublicKey.Y = tempSK.PublicKey.Add( client.enrollPrivKey.PublicKey.X, client.enrollPrivKey.PublicKey.Y, tempX, tempY, ) // Verify temporary public key is a valid point on the reference curve isOn := tempSK.Curve.IsOnCurve(tempSK.PublicKey.X, tempSK.PublicKey.Y) if !isOn { client.error("Failed temporary public key IsOnCurve check.") return nil, fmt.Errorf("Failed temporary public key IsOnCurve check.") } // Check that the derived public key is the same as the one in the certificate certPK := x509Cert.PublicKey.(*ecdsa.PublicKey) if certPK.X.Cmp(tempSK.PublicKey.X) != 0 { client.error("Derived public key is different on X") return nil, fmt.Errorf("Derived public key is different on X") } if certPK.Y.Cmp(tempSK.PublicKey.Y) != 0 { client.error("Derived public key is different on Y") return nil, fmt.Errorf("Derived public key is different on Y") } // Verify the signing capability of tempSK err = primitives.VerifySignCapability(tempSK, x509Cert.PublicKey) if err != nil { client.error("Failed verifing signing capability [%s].", err.Error()) return } // Marshall certificate and secret key to be stored in the database if err != nil { client.error("Failed marshalling private key [%s].", err.Error()) return } if err = utils.CheckCertPKAgainstSK(x509Cert, interface{}(tempSK)); err != nil { client.error("Failed checking TCA cert PK against private key [%s].", err.Error()) return } tCert = &tCertImpl{client, x509Cert, tempSK} return }
func (client *clientImpl) getTCertFromExternalDER(der []byte) (tCert, error) { // DER to x509 x509Cert, err := primitives.DERToX509Certificate(der) if err != nil { client.Debugf("Failed parsing certificate [% x]: [%s].", der, err) return nil, err } // Handle Critical Extension TCertEncTCertIndex tCertIndexCT, err := primitives.GetCriticalExtension(x509Cert, primitives.TCertEncTCertIndex) if err != nil { client.Errorf("Failed getting extension TCERT_ENC_TCERTINDEX [% x]: [%s].", der, err) return nil, err } // Handle Critical Extension TCertEncEnrollmentID TODO validate encEnrollmentID _, err = primitives.GetCriticalExtension(x509Cert, primitives.TCertEncEnrollmentID) if err != nil { client.Errorf("Failed getting extension TCERT_ENC_ENROLLMENT_ID [%s].", err.Error()) return nil, err } // Handle Critical Extension TCertAttributes // for i := 0; i < len(x509Cert.Extensions) - 2; i++ { // attributeExtensionIdentifier := append(utils.TCertEncAttributesBase, i + 9) // _ , err = utils.GetCriticalExtension(x509Cert, attributeExtensionIdentifier) // if err != nil { // client.Errorf("Failed getting extension TCERT_ATTRIBUTE_%s [%s].", i, err.Error()) // // return nil, err // } // } // Verify certificate against root if _, err := primitives.CheckCertAgainRoot(x509Cert, client.tcaCertPool); err != nil { client.Warningf("Warning verifing certificate [% x]: [%s].", der, err) return nil, err } // Try to extract the signing key from the TCert by decrypting the TCertIndex // 384-bit ExpansionValue = HMAC(Expansion_Key, TCertIndex) // Let TCertIndex = Timestamp, RandValue, 1,2,… // Timestamp assigned, RandValue assigned and counter reinitialized to 1 per batch // Decrypt ct to TCertIndex (TODO: || EnrollPub_Key || EnrollID ?) TCertOwnerEncryptKey := primitives.HMACAESTruncated(client.tCertOwnerKDFKey, []byte{1}) ExpansionKey := primitives.HMAC(client.tCertOwnerKDFKey, []byte{2}) pt, err := primitives.CBCPKCS7Decrypt(TCertOwnerEncryptKey, tCertIndexCT) if err == nil { // Compute ExpansionValue based on TCertIndex TCertIndex := pt // TCertIndex := []byte(strconv.Itoa(i)) // TODO: verify that TCertIndex has right format. client.Debugf("TCertIndex: [% x].", TCertIndex) mac := hmac.New(primitives.NewHash, ExpansionKey) mac.Write(TCertIndex) ExpansionValue := mac.Sum(nil) // Derive tpk and tsk accordingly to ExpansionValue from enrollment pk,sk // Computable by TCA / Auditor: TCertPub_Key = EnrollPub_Key + ExpansionValue G // using elliptic curve point addition per NIST FIPS PUB 186-4- specified P-384 // Compute temporary secret key tempSK := &ecdsa.PrivateKey{ PublicKey: ecdsa.PublicKey{ Curve: client.enrollPrivKey.Curve, X: new(big.Int), Y: new(big.Int), }, D: new(big.Int), } var k = new(big.Int).SetBytes(ExpansionValue) var one = new(big.Int).SetInt64(1) n := new(big.Int).Sub(client.enrollPrivKey.Params().N, one) k.Mod(k, n) k.Add(k, one) tempSK.D.Add(client.enrollPrivKey.D, k) tempSK.D.Mod(tempSK.D, client.enrollPrivKey.PublicKey.Params().N) // Compute temporary public key tempX, tempY := client.enrollPrivKey.PublicKey.ScalarBaseMult(k.Bytes()) tempSK.PublicKey.X, tempSK.PublicKey.Y = tempSK.PublicKey.Add( client.enrollPrivKey.PublicKey.X, client.enrollPrivKey.PublicKey.Y, tempX, tempY, ) // Verify temporary public key is a valid point on the reference curve isOn := tempSK.Curve.IsOnCurve(tempSK.PublicKey.X, tempSK.PublicKey.Y) if !isOn { client.Warning("Failed temporary public key IsOnCurve check. This is an foreign certificate.") return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } // Check that the derived public key is the same as the one in the certificate certPK := x509Cert.PublicKey.(*ecdsa.PublicKey) if certPK.X.Cmp(tempSK.PublicKey.X) != 0 { client.Warning("Derived public key is different on X. This is an foreign certificate.") return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } if certPK.Y.Cmp(tempSK.PublicKey.Y) != 0 { client.Warning("Derived public key is different on Y. This is an foreign certificate.") return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } // Verify the signing capability of tempSK err = primitives.VerifySignCapability(tempSK, x509Cert.PublicKey) if err != nil { client.Warning("Failed verifing signing capability [%s]. This is an foreign certificate.", err.Error()) return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } // Marshall certificate and secret key to be stored in the database if err != nil { client.Warningf("Failed marshalling private key [%s]. This is an foreign certificate.", err.Error()) return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } if err = primitives.CheckCertPKAgainstSK(x509Cert, interface{}(tempSK)); err != nil { client.Warningf("Failed checking TCA cert PK against private key [%s]. This is an foreign certificate.", err.Error()) return &tCertImpl{client, x509Cert, nil, []byte{}}, nil } return &tCertImpl{client, x509Cert, tempSK, []byte{}}, nil } client.Warningf("Failed decrypting extension TCERT_ENC_TCERTINDEX [%s]. This is an foreign certificate.", err.Error()) return &tCertImpl{client, x509Cert, nil, []byte{}}, nil }