Switched encryption of payload and keys to AES
Added Encrypted field to the protobuf
This commit is contained in:
Samuel Hawksby-Robinson
Andrea Maria Piana
parent
0080de754e
commit
b009bac5fb
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@ -9,11 +9,17 @@ import (
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"golang.org/x/crypto/sha3"
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"github.com/ethereum/go-ethereum/crypto/ecies"
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"github.com/status-im/status-go/eth-node/crypto"
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"github.com/status-im/status-go/eth-node/types"
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)
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const nonceLength = 12
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const(
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nonceLength = 12
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defaultECHDSharedKeyLength = 16
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defaultECHDMACLength = 16
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)
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var ErrInvalidCiphertextLength = errors.New("invalid cyphertext length")
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@ -86,3 +92,11 @@ func HexToPubkey(pk string) (*ecdsa.PublicKey, error) {
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}
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return crypto.UnmarshalPubkey(bytes)
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}
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func MakeECDHSharedKey(yourPrivateKey *ecdsa.PrivateKey, theirPubKey *ecdsa.PublicKey) ([]byte, error) {
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return ecies.ImportECDSA(yourPrivateKey).GenerateShared(
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ecies.ImportECDSAPublic(theirPubKey),
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defaultECHDSharedKeyLength,
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defaultECHDMACLength,
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)
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}
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@ -5,7 +5,6 @@ import (
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"context"
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"crypto/ecdsa"
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crand "crypto/rand"
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"crypto/x509"
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"database/sql"
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"encoding/hex"
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"fmt"
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@ -23,8 +22,6 @@ import (
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"github.com/davecgh/go-spew/spew"
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"github.com/golang/protobuf/proto"
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"github.com/ethereum/go-ethereum/crypto/ecies"
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"github.com/status-im/status-go/appdatabase"
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"github.com/status-im/status-go/appmetrics"
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"github.com/status-im/status-go/connection"
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@ -780,6 +777,7 @@ func (m *Messenger) attachIdentityImagesToChatIdentity(context chatContext, ci *
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return err
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}
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// TODO remove the use of ProfilePicturesVisibility and create a new settings field,
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if s.ProfilePicturesVisibility == accounts.ProfilePicturesVisibilityNone {
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m.logger.Info(fmt.Sprintf("settings.ProfilePicturesVisibility is set to '%d', skipping attaching IdentityImages", s.ProfilePicturesVisibility))
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return nil
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@ -832,46 +830,95 @@ func (m *Messenger) attachIdentityImagesToChatIdentity(context chatContext, ci *
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return nil
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}
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func (m *Messenger) encryptIdentityImagesWithContactPubKeys(ciis map[string]*protobuf.IdentityImage) error {
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// Make ephemeral key
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pk, err := crypto.GenerateKey()
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func (m *Messenger) encryptIdentityImagesWithContactPubKeys(iis map[string]*protobuf.IdentityImage) (err error) {
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// Make AES key
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AESKey := make([]byte, 32)
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_, err = crand.Read(AESKey)
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if err != nil {
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return err
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}
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// Marshal the ephemeral private key into bytes
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mpk, err := x509.MarshalECPrivateKey(pk)
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if err != nil {
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return err
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}
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for _, ii := range ciis {
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// Encrypt image payloads with the ephemeral public key
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encryptedPayload, err := ecies.Encrypt(crand.Reader, ecies.ImportECDSAPublic(&pk.PublicKey), ii.Payload, nil, nil)
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for _, ii := range iis {
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// Encrypt image payload with the AES key
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encryptedPayload, err := common.Encrypt(ii.Payload, AESKey, crand.Reader)
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if err != nil {
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return err
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}
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// Overwrite the unencrypted payload with the newly encrypted payload
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ii.Payload = encryptedPayload
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for _, c := range m.allContacts {
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ii.Encrypted = true
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m.allContacts.Range(func(contactID string, c *Contact) (shouldContinue bool) {
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if !c.IsAdded() {
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continue
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return false
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}
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pubK, err := c.PublicKey()
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if err != nil {
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return err
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return false
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}
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// Generate a Diffie-Helman (DH) between the sender private key and the recipient's public key
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sharedKey, err := common.MakeECDHSharedKey(m.identity, pubK)
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if err != nil {
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return false
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}
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// Encrypt the marshalled ephemeral private key with the contact's public key
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empk, err := ecies.Encrypt(crand.Reader, ecies.ImportECDSAPublic(pubK), mpk, nil, nil)
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// Encrypt the main AES key with AES encryption using the DH key
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eAESKey, err := common.Encrypt(AESKey, sharedKey, crand.Reader)
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if err != nil {
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return false
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}
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// Append the the encrypted main AES key to the IdentityImage's EncryptionKeys slice.
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ii.EncryptionKeys = append(ii.EncryptionKeys, eAESKey)
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return true
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})
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (m *Messenger) decryptIdentityImagesWithIdentityPrivateKey(iis map[string]*protobuf.IdentityImage, senderPubKey *ecdsa.PublicKey) error {
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image:
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for _, ii := range iis {
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for _, empk := range ii.EncryptionKeys {
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// Generate a Diffie-Helman (DH) between the recipient's private key and the sender's public key
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sharedKey, err := common.MakeECDHSharedKey(m.identity, senderPubKey)
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if err != nil {
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return err
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}
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// Append the the encrypted private key to the IdentityImage's EncryptionKeys slice.
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ii.EncryptionKeys = append(ii.EncryptionKeys, empk)
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// Decrypt the main encryption AES key with AES encryption using the DH key
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dAESKey, err := common.Decrypt(empk, sharedKey)
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if err != nil {
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if err.Error() == "cipher: message authentication failed" {
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continue
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}
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return err
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}
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if dAESKey == nil{
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return errors.New("decrypting the payload encryption key resulted in no error and a nil key")
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}
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// Decrypt the payload with the newly decrypted main encryption AES key
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payload, err := common.Decrypt(ii.Payload, dAESKey)
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if err != nil {
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return err
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}
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if payload == nil {
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// TODO should this be a logger warn? A payload could theoretically be validly empty
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return errors.New("decrypting the payload resulted in no error and a nil payload")
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}
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// Overwrite the payload with the decrypted data
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ii.Payload = payload
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ii.Encrypted = false // TODO handle the encryption state in the consuming code
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continue image
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}
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}
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@ -79,6 +79,16 @@ func (cm *contactMap) Delete(contactID string) {
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cm.sm.Delete(contactID)
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}
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func (cm *contactMap) Len() int {
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count := 0
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cm.Range(func(key string, value *Contact) (shouldContinue bool) {
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count++
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return true
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})
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return count
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}
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/*
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|--------------------------------------------------------------------------
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| systemMessageTranslationsMap
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@ -2564,3 +2564,81 @@ func (s *MessengerSuite) TestPublicMessageOnCommunityChat() {
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s.Require().Error(err)
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s.Require().Equal(ErrMessageForWrongChatType, err)
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}
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func (s *MessengerSuite) TestEncryptDecryptIdentityImagesWithContactPubKeys() {
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smPayload := "hello small image"
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lgPayload := "hello large image"
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ci := protobuf.ChatIdentity{
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Clock: uint64(time.Now().Unix()),
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Images: map[string]*protobuf.IdentityImage{
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"small": {
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Payload: []byte(smPayload),
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},
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"large": {
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Payload: []byte(lgPayload),
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},
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},
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}
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// Make contact keys and Contacts, set the Contacts to added
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var contactKeys []*ecdsa.PrivateKey
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for i:=0; i < 10; i++ {
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contactKey, err := crypto.GenerateKey()
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s.Require().NoError(err)
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contactKeys = append(contactKeys, contactKey)
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contact, err := BuildContactFromPublicKey(&contactKey.PublicKey)
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s.Require().NoError(err)
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contact.SystemTags = append(contact.SystemTags, contactAdded)
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s.m.allContacts.Store(contact.ID, contact)
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}
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// Test encryptIdentityImagesWithContactPubKeys
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err := s.m.encryptIdentityImagesWithContactPubKeys(ci.Images)
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s.Require().NoError(err)
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for _, ii := range ci.Images {
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s.Require().Equal(s.m.allContacts.Len, len(ii.EncryptionKeys))
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}
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s.Require().NotEqual([]byte(smPayload), ci.Images["small"].Payload)
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s.Require().NotEqual([]byte(lgPayload), ci.Images["large"].Payload)
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// Switch messenger identities
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sender := s.m.identity
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s.m.identity = contactKeys[2]
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// Test decryptIdentityImagesWithIdentityPrivateKey
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err = s.m.decryptIdentityImagesWithIdentityPrivateKey(ci.Images, &sender.PublicKey)
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s.Require().NoError(err)
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s.Require().Equal(smPayload, string(ci.Images["small"].Payload))
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s.Require().Equal(lgPayload, string(ci.Images["large"].Payload))
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// RESET Messenger identity, Contacts and IdentityImage.EncryptionKeys
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s.m.identity = sender
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s.m.allContacts = nil
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ci.Images["small"].EncryptionKeys = nil
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ci.Images["large"].EncryptionKeys = nil
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// Test encryptIdentityImagesWithContactPubKeys with no contacts
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err = s.m.encryptIdentityImagesWithContactPubKeys(ci.Images)
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s.Require().NoError(err)
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for _, ii := range ci.Images {
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s.Require().Equal(0, len(ii.EncryptionKeys))
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}
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s.Require().NotEqual([]byte(smPayload), ci.Images["small"].Payload)
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s.Require().NotEqual([]byte(lgPayload), ci.Images["large"].Payload)
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// Switch messenger identities
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s.m.identity = contactKeys[2]
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// Test decryptIdentityImagesWithIdentityPrivateKey with no valid identity
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err = s.m.decryptIdentityImagesWithIdentityPrivateKey(ci.Images, &sender.PublicKey)
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s.Require().NoError(err)
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s.Require().NotEqual([]byte(smPayload), ci.Images["small"].Payload)
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s.Require().NotEqual([]byte(lgPayload), ci.Images["large"].Payload)
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}
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@ -150,6 +150,8 @@ type IdentityImage struct {
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ImageType ImageType `protobuf:"varint,3,opt,name=image_type,json=imageType,proto3,enum=protobuf.ImageType" json:"image_type,omitempty"`
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// encryption_keys is a list of encrypted keys that can be used to decrypted an encrypted payload
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EncryptionKeys [][]byte `protobuf:"bytes,4,rep,name=encryption_keys,json=encryptionKeys,proto3" json:"encryption_keys,omitempty"`
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// encrypted signals the encryption state of the payload, default is false.
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Encrypted bool `protobuf:"varint,5,opt,name=encrypted,proto3" json:"encrypted,omitempty"`
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XXX_NoUnkeyedLiteral struct{} `json:"-"`
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XXX_unrecognized []byte `json:"-"`
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XXX_sizecache int32 `json:"-"`
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@ -208,6 +210,13 @@ func (m *IdentityImage) GetEncryptionKeys() [][]byte {
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return nil
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}
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func (m *IdentityImage) GetEncrypted() bool {
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if m != nil {
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return m.Encrypted
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}
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return false
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}
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func init() {
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proto.RegisterEnum("protobuf.IdentityImage_SourceType", IdentityImage_SourceType_name, IdentityImage_SourceType_value)
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proto.RegisterType((*ChatIdentity)(nil), "protobuf.ChatIdentity")
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@ -220,31 +229,32 @@ func init() {
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}
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var fileDescriptor_7a652489000a5879 = []byte{
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// 414 bytes of a gzipped FileDescriptorProto
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|
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||||
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|
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|
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|
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|
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0xed, 0xda, 0xb2, 0x9d, 0x27, 0x4e, 0x75, 0xe5, 0x7f, 0xf2, 0x26, 0x7f, 0x7d, 0x38, 0x3b, 0x6a,
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0xb5, 0x29, 0x39, 0x01, 0xf5, 0x12, 0xe3, 0x19, 0x80, 0xbd, 0x94, 0x63, 0x04, 0x96, 0x31, 0x6e,
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0x31, 0x9e, 0x7b, 0x76, 0xa8, 0x9f, 0xd7, 0x21, 0x7e, 0x07, 0xe7, 0x5c, 0x64, 0x95, 0xb1, 0xc7,
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|
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|
||||
0x3c, 0x7c, 0x5f, 0x26, 0x5f, 0x47, 0x1e, 0x1e, 0x02, 0x2c, 0xd2, 0x15, 0x4d, 0x7e, 0x24, 0xeb,
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||||
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|
||||
0xff, 0x03, 0x00, 0x00, 0xff, 0xff, 0x8e, 0x12, 0x2e, 0x02, 0x86, 0x02, 0x00, 0x00,
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// 425 bytes of a gzipped FileDescriptorProto
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0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x54, 0x90, 0xc1, 0x6e, 0xd3, 0x40,
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||||
0x10, 0x86, 0xb1, 0x9d, 0xa4, 0xc9, 0x6c, 0x9a, 0x46, 0x1b, 0xa4, 0x9a, 0x8a, 0x83, 0xc9, 0x85,
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0x5c, 0x30, 0x52, 0xb8, 0xa0, 0x72, 0x32, 0x21, 0x48, 0x55, 0x91, 0x53, 0x6d, 0x52, 0xaa, 0x72,
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||||
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||||
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||||
0x82, 0x88, 0xfc, 0x78, 0x90, 0x46, 0x9e, 0xff, 0xb1, 0x61, 0xbc, 0x7a, 0xe4, 0xea, 0xaa, 0xee,
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||||
0xa6, 0x2f, 0xa1, 0x1f, 0x67, 0x45, 0xbc, 0x77, 0x2d, 0xcf, 0x5a, 0xf4, 0x98, 0x49, 0xe8, 0x2b,
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0x18, 0x8a, 0x5c, 0x46, 0x39, 0x3f, 0x08, 0xd7, 0xf6, 0xac, 0xc5, 0x88, 0x9d, 0x88, 0x5c, 0x86,
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||||
0xfc, 0x20, 0xe8, 0x25, 0x0c, 0xd2, 0x03, 0xff, 0x25, 0xa4, 0xeb, 0x78, 0xce, 0x82, 0x2c, 0xe7,
|
||||
0x7e, 0xb3, 0xc9, 0xef, 0x82, 0xfd, 0x2b, 0x6c, 0x5a, 0xe7, 0xaa, 0xd2, 0xac, 0x9e, 0xa0, 0x6f,
|
||||
0x60, 0x9c, 0xa4, 0xb2, 0xcc, 0xb8, 0x36, 0xe8, 0x1e, 0xa2, 0x49, 0xad, 0x21, 0xde, 0x03, 0x92,
|
||||
0x08, 0x19, 0x57, 0x69, 0xa9, 0xd2, 0x22, 0x77, 0xfb, 0x75, 0x47, 0x2b, 0xa1, 0xe3, 0x22, 0x2b,
|
||||
0x2a, 0x77, 0x80, 0x35, 0x93, 0x5c, 0x30, 0x20, 0x9d, 0x8d, 0x74, 0x0a, 0xce, 0x5e, 0x68, 0xfc,
|
||||
0xd4, 0x88, 0x3d, 0x85, 0xf4, 0x1d, 0xf4, 0x7f, 0xf3, 0xec, 0x68, 0xfe, 0x43, 0x96, 0xe7, 0xad,
|
||||
0xed, 0xc6, 0x32, 0xce, 0x33, 0xd3, 0x75, 0x69, 0x7f, 0xb4, 0xe6, 0x7f, 0x6d, 0x38, 0x7d, 0x56,
|
||||
0xa4, 0x2e, 0x9c, 0x94, 0x5c, 0x67, 0x05, 0x4f, 0x10, 0x3d, 0x66, 0x4d, 0x4a, 0x57, 0x40, 0x64,
|
||||
0x71, 0xac, 0x62, 0x11, 0x29, 0x5d, 0x9a, 0x25, 0x93, 0xee, 0x6d, 0x9e, 0x71, 0xfc, 0x2d, 0xb6,
|
||||
0xee, 0x74, 0x29, 0x18, 0xc8, 0xff, 0x31, 0x5d, 0x02, 0xe0, 0xa5, 0x0c, 0xc3, 0x41, 0xc6, 0xac,
|
||||
0xc3, 0x78, 0xaa, 0xe1, 0xd0, 0x28, 0x6d, 0x42, 0xfa, 0x16, 0xce, 0x44, 0x1e, 0x57, 0x1a, 0x8f,
|
||||
0x13, 0xed, 0x85, 0x96, 0x6e, 0xcf, 0x73, 0x16, 0x63, 0x36, 0x69, 0xe5, 0x6b, 0xa1, 0x25, 0x7d,
|
||||
0x0d, 0xa3, 0x5a, 0x11, 0x09, 0xde, 0x75, 0xc8, 0x5a, 0x61, 0xfe, 0x15, 0xa0, 0x35, 0x45, 0xcf,
|
||||
0x61, 0x76, 0x1b, 0x5e, 0x87, 0x9b, 0xbb, 0x30, 0xda, 0x6e, 0x6e, 0xd9, 0x6a, 0x1d, 0xed, 0xee,
|
||||
0x6f, 0xd6, 0xd3, 0x17, 0xf4, 0x0c, 0x08, 0x0b, 0xee, 0xa2, 0x9b, 0xe0, 0xfe, 0xdb, 0x26, 0xf8,
|
||||
0x32, 0xb5, 0xe8, 0x04, 0x60, 0x1d, 0x6e, 0xa3, 0xe0, 0x7b, 0xb0, 0x0b, 0xd8, 0xd4, 0xfe, 0x7c,
|
||||
0xfa, 0x83, 0xf8, 0xef, 0x3f, 0x35, 0x96, 0x1f, 0x06, 0x18, 0x7d, 0xf8, 0x17, 0x00, 0x00, 0xff,
|
||||
0xff, 0xc9, 0xd1, 0xd6, 0xde, 0xa4, 0x02, 0x00, 0x00,
|
||||
}
|
||||
|
|
|
|||
|
|
@ -41,6 +41,9 @@ message IdentityImage {
|
|||
// encryption_keys is a list of encrypted keys that can be used to decrypted an encrypted payload
|
||||
repeated bytes encryption_keys = 4;
|
||||
|
||||
// encrypted signals the encryption state of the payload, default is false.
|
||||
bool encrypted = 5;
|
||||
|
||||
// SourceType are the predefined types of image source allowed
|
||||
enum SourceType {
|
||||
UNKNOWN_SOURCE_TYPE = 0;
|
||||
|
|
|
|||
Loading…
Reference in New Issue