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New functions for flutter openpgp compatibility

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This commit is contained in:
ycc
2022-11-20 17:52:27 +01:00
parent 7fe7892764
commit 2516b41597
2 changed files with 181 additions and 0 deletions
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107
asymcrypt.go
View File

@@ -192,3 +192,110 @@ func createPublicKeyRing(publicKey string) (*crypto.KeyRing, error) {
return publicKeyRing, nil
}
func AsymEncryptAndSign2(PublicEncryptionKey string, PrivateSignatureKey string, data []byte) ([]byte, []byte, error) {
pub, err := base64.StdEncoding.DecodeString(PublicEncryptionKey)
if err != nil {
log.Error().Msg("Message encryption and sign b64 failed")
}
priv, err := base64.StdEncoding.DecodeString(PrivateSignatureKey)
if err != nil {
log.Error().Msg("Message encryption and sign b64 failed")
}
ciphertext, signature, err := encryptAndSignMessage(string(pub), string(priv), crypto.NewPlainMessage(data))
if err != nil {
log.Error().Msg("Message encryption failed")
return nil, nil, err
}
return ciphertext.GetBinary(), signature, err
}
func AsymDecryptAndCheck2(MyPrivateEncryptionKey string, MyContactPublicKey string, data []byte, Signature []byte) (DecryptedMessage []byte, err error) {
priv, err := base64.StdEncoding.DecodeString(MyPrivateEncryptionKey)
if err != nil {
log.Error().Msg("Message decryption and sign b64 failed")
}
pub, err := base64.StdEncoding.DecodeString(MyContactPublicKey)
if err != nil {
log.Error().Msg("Message decryption and sign b64 failed")
}
DecryptedMessage, err = decryptAndCheckMessage(string(pub), string(priv), crypto.NewPGPMessage(data), crypto.NewPGPSignature(Signature))
if err != nil {
log.Error().Msg("Message decryption and sign failed")
}
return DecryptedMessage, err
}
func encryptAndSignMessage(pub string, priv string, message *crypto.PlainMessage) (*crypto.PGPMessage, []byte, error) {
var privateKeyObj, unlockedKeyObj *crypto.Key
var privateKeyRing *crypto.KeyRing
publicKeyRing, err := createPublicKeyRing(pub)
if err != nil {
return nil, nil, err
}
if err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to encrypt message")
}
if privateKeyObj, err = crypto.NewKeyFromArmored(priv); err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to parse private key")
}
if unlockedKeyObj, err = privateKeyObj.Unlock(nil); err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to unlock key")
}
defer unlockedKeyObj.ClearPrivateParams()
if privateKeyRing, err = crypto.NewKeyRing(unlockedKeyObj); err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to create private keyring")
}
ciphertext, err := publicKeyRing.Encrypt(message, nil)
if err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to encrypt message")
}
signature, err := privateKeyRing.SignDetached(message)
if err != nil {
return nil, nil, errors.Wrap(err, "gopenpgp: unable to encrypt message")
}
return ciphertext, signature.GetBinary(), nil
}
func decryptAndCheckMessage(pub string, priv string, message *crypto.PGPMessage, signature *crypto.PGPSignature) ([]byte, error) {
var privateKeyObj, unlockedKeyObj *crypto.Key
var privateKeyRing *crypto.KeyRing
publicKeyRing, err := createPublicKeyRing(pub)
if err != nil {
return nil, err
}
if err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to encrypt message")
}
if privateKeyObj, err = crypto.NewKeyFromArmored(priv); err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to parse private key")
}
if unlockedKeyObj, err = privateKeyObj.Unlock(nil); err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to unlock key")
}
defer unlockedKeyObj.ClearPrivateParams()
if privateKeyRing, err = crypto.NewKeyRing(unlockedKeyObj); err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to create private keyring")
}
plainmessage, err := privateKeyRing.Decrypt(message, nil, 0)
if err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to decrypt message")
}
err = publicKeyRing.VerifyDetached(plainmessage, signature, crypto.GetUnixTime())
if err != nil {
return nil, errors.Wrap(err, "gopenpgp: unable to check message signature")
}
return plainmessage.GetBinary(), nil
}

74
asymcrypt_test.go
View File

@@ -3,6 +3,7 @@ package meowlib
import (
"encoding/base64"
"fmt"
"io/ioutil"
"log"
"testing"
@@ -93,6 +94,20 @@ func TestAsymEncryptDecryptSigned(t *testing.T) {
assert.Equal(t, foo, string(decMess), "The two messages should be the same.")
}
func TestAsymEncryptDecryptSigned2(t *testing.T) {
kp := NewKeyPair()
foo := "!#$%&()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]^_abcdefghijklmnopqrstuvwxyz{|}~"
encMess, sign, err := AsymEncryptAndSign2(kp.Public, kp.Private, []byte(foo))
if err != nil {
log.Println(err.Error())
}
decMess, err2 := AsymDecryptAndCheck2(kp.Private, kp.Public, encMess, sign)
if err2 != nil {
log.Println(err2.Error())
}
assert.Equal(t, foo, string(decMess), "The two messages should be the same.")
}
func TestFlutterCompat(t *testing.T) {
pub := base64.StdEncoding.EncodeToString([]byte(publicKeyECC))
priv := base64.StdEncoding.EncodeToString([]byte(privateKeyECC))
@@ -104,4 +119,63 @@ func TestFlutterCompat(t *testing.T) {
println(base64.StdEncoding.EncodeToString(encMess))
println(base64.StdEncoding.EncodeToString(sign))
}
func TestFlutterDecode(t *testing.T) {
pub, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/pub.key")
if err != nil {
fmt.Println("Err")
}
priv, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/priv.key")
if err != nil {
fmt.Println("Err")
}
msg, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/msg.enc")
if err != nil {
fmt.Println("Err")
}
sign, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/msg.sign")
if err != nil {
fmt.Println("Err")
}
decMsg, err := AsymDecrypt(base64.StdEncoding.EncodeToString(priv), msg)
if err != nil {
log.Println(err.Error())
}
println(string(decMsg))
decMsg, err = AsymDecryptAndCheck2(base64.StdEncoding.EncodeToString(priv), base64.StdEncoding.EncodeToString(pub), msg, sign)
if err != nil {
log.Println(err.Error())
}
println(string(decMsg))
println(base64.StdEncoding.EncodeToString(pub))
}
func TestFlutterEncode(t *testing.T) {
pub, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/pub.key")
if err != nil {
fmt.Println("Err")
}
priv, err := ioutil.ReadFile("/home/yves/Documents/code/flutter/meowlib/priv.key")
if err != nil {
fmt.Println("Err")
}
encMess, sign2, err := AsymEncryptAndSign2(base64.StdEncoding.EncodeToString(pub), base64.StdEncoding.EncodeToString(priv), []byte("Hello"))
if err != nil {
log.Println(err.Error())
}
err = ioutil.WriteFile("/home/yves/Documents/code/flutter/meowlib/gomsg.enc", encMess, 0644)
if err != nil {
fmt.Println("Err")
}
err = ioutil.WriteFile("/home/yves/Documents/code/flutter/meowlib/gomsg.sign", sign2, 0644)
if err != nil {
fmt.Println("Err")
}
println(base64.StdEncoding.EncodeToString(pub))
}