Remove unused code + handle errors

crypto/attachment.go

@@ -2,6 +2,7 @@ package crypto
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"runtime"
@@ -123,7 +124,10 @@ func (pm *PmCrypto) DecryptAttachment(keyPacket []byte, dataPacket []byte, kr *K
 
 	privKeyEntries := kr.entities
 
-	kr.Unlock([]byte(passphrase))
+	if err := kr.Unlock([]byte(passphrase)); err != nil {
+		err = fmt.Errorf("pm-crypto: cannot decrypt attachment: %v", err)
+		return nil, err
+	}
 
 	keyReader := bytes.NewReader(keyPacket)
 	dataReader := bytes.NewReader(dataPacket)

crypto/key.go

@@ -192,22 +192,23 @@ func SeparateKeyAndData(kr *KeyRing, r io.Reader, estimatedLength int, garbageCo
 			}
 
 			outSplit.DataPacket = symEncryptedData
-			break
-
 		}
 	}
 	if decryptErr != nil {
 		err = fmt.Errorf("pm-crypto: cannot decrypt encrypted key packet: %v", decryptErr)
-		return
+		return nil, err
 	}
 	if ek == nil {
 		err = errors.New("pm-crypto: packets don't include an encrypted key packet")
-		return
+		return nil, err
 	}
 
 	if kr == nil {
 		var buf bytes.Buffer
-		ek.Serialize(&buf)
+		if err := ek.Serialize(&buf); err != nil {
+			err = fmt.Errorf("pm-crypto: cannot serialize encrypted key: %v", err)
+			return nil, err
+		}
 		outSplit.KeyPacket = buf.Bytes()
 	} else {
 		key := newSymmetricKey(ek)

crypto/keyring.go

@@ -527,6 +527,9 @@ func (pm *PmCrypto) BuildKeyRingNoError(binKeys []byte) (kr *KeyRing) {
 // BuildKeyRingArmored reads armored string and returns keyring
 func (pm *PmCrypto) BuildKeyRingArmored(key string) (kr *KeyRing, err error) {
 	keyRaw, err := armorUtils.Unarmor(key)
+	if err != nil {
+		return nil, err
+	}
 	keyReader := bytes.NewReader(keyRaw)
 	keyEntries, err := openpgp.ReadKeyRing(keyReader)
 	return &KeyRing{entities: keyEntries}, err

crypto/message.go

@@ -3,6 +3,7 @@ package crypto
 import (
 	"bytes"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"math"
@@ -59,7 +60,10 @@ func (pm *PmCrypto) DecryptMessage(encryptedText string, privateKey *KeyRing, pa
 
 func decryptCore(encryptedText string, additionalEntries openpgp.EntityList, privKey *KeyRing, passphrase string, timeFunc func() time.Time) (*openpgp.MessageDetails, error) {
 	rawPwd := []byte(passphrase)
-	privKey.Unlock(rawPwd)
+	if err := privKey.Unlock(rawPwd); err != nil {
+		err = fmt.Errorf("pm-crypto: cannot decrypt passphrase: %v", err)
+		return nil, err
+	}
 
 	privKeyEntries := privKey.entities
 	for _, entity := range privKey.entities {

crypto/session.go

@@ -46,9 +46,6 @@ func (pm *PmCrypto) GetSessionFromKeyPacket(keyPackage []byte, privateKey *KeyRi
 
 	ek := p.(*packet.EncryptedKey)
 
-	if err != nil {
-		return nil, err
-	}
 	rawPwd := []byte(passphrase)
 	var decryptErr error
 	for _, key := range privateKey.entities.DecryptionKeys() {