fix: Fix literal metadata in hash suffix for v5 signatures

openpgp/packet/signature.go

@@ -754,7 +754,7 @@ func (sig *Signature) buildHashSuffix(hashedSubpackets []byte) (err error) {
 	})
 	hashedSubpacketsLength := len(hashedSubpackets)
 	if sig.Version == 6 {
-		// v6 keys store the length in 4 octets
+		// v6 signatures store the length in 4 octets
 		hashedFields.Write([]byte{
 			uint8(hashedSubpacketsLength >> 24),
 			uint8(hashedSubpacketsLength >> 16),
@@ -1064,18 +1064,16 @@ func (sig *Signature) Serialize(w io.Writer) (err error) {
 		panic("impossible")
 	}
 
+	hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true)
 	unhashedSubpacketsLen := subpacketsLength(sig.outSubpackets, false)
-	length := len(sig.HashSuffix) - 6 /* trailer not included */ +
+	length := 4 + /* length of version|signature type|public-key algorithm|hash algorithm */
+		2 /* length of hashed subpackets */ + hashedSubpacketsLen +
 		2 /* length of unhashed subpackets */ + unhashedSubpacketsLen +
 		2 /* hash tag */ + sigLength
-	if sig.Version == 5 {
-		length -= 4 // eight-octet instead of four-octet big endian
-	}
 	if sig.Version == 6 {
-		// unhashed length is four-octet instead
-		// salt len 1 octet
-		// len(salt) octets
-		length += 3 + len(sig.salt)
+		length += 4 + /* the two length fields are four-octet instead of two */
+			1 + /* salt length */
+			len(sig.salt) /* length salt */
 	}
 	err = serializeHeader(w, packetTypeSignature, length)
 	if err != nil {
@@ -1370,8 +1368,6 @@ func (sig *Signature) AddMetadataToHashSuffix() {
 	binary.BigEndian.PutUint32(buf[:], lit.Time)
 	suffix.Write(buf[:])
 
-	// Update the counter and restore trailing bytes
-	l = uint64(suffix.Len())
 	suffix.Write([]byte{0x05, 0xff})
 	suffix.Write([]byte{
 		uint8(l >> 56), uint8(l >> 48), uint8(l >> 40), uint8(l >> 32),

openpgp/read.go

@@ -298,7 +298,7 @@ FindLiteralData:
 	if md.IsSigned && md.SignatureError == nil {
 		md.UnverifiedBody = &signatureCheckReader{packets, h, wrappedHash, md, config}
 	} else if md.decrypted != nil {
-		md.UnverifiedBody = checkReader{md}
+		md.UnverifiedBody = &checkReader{md, false}
 	} else {
 		md.UnverifiedBody = md.LiteralData.Body
 	}
@@ -349,16 +349,22 @@ func hashForSignature(hashFunc crypto.Hash, sigType packet.SignatureType, sigSal
 // it closes the ReadCloser from any SymmetricallyEncrypted packet to trigger
 // MDC checks.
 type checkReader struct {
-	md *MessageDetails
+	md      *MessageDetails
+	checked bool
 }
 
-func (cr checkReader) Read(buf []byte) (int, error) {
+func (cr *checkReader) Read(buf []byte) (int, error) {
 	n, sensitiveParsingError := cr.md.LiteralData.Body.Read(buf)
 	if sensitiveParsingError == io.EOF {
+		if cr.checked {
+			// Only check once
+			return n, io.EOF
+		}
 		mdcErr := cr.md.decrypted.Close()
 		if mdcErr != nil {
 			return n, mdcErr
 		}
+		cr.checked = true
 		return n, io.EOF
 	}
 

openpgp/read_test.go

@@ -888,3 +888,38 @@ func TestMessageWithoutMdc(t *testing.T) {
 		}
 	})
 }
+
+func TestReadV5Messages(t *testing.T) {
+	key, err := ReadArmoredKeyRing(strings.NewReader(keyv5Test))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	keyVer, err := ReadArmoredKeyRing(strings.NewReader(certv5Test))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	keys := append(key, keyVer...)
+	msgReader, err := armor.Decode(strings.NewReader(msgv5Test))
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	md, err := ReadMessage(msgReader.Body, keys, nil, nil)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	contents, err := ioutil.ReadAll(md.UnverifiedBody)
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	if string(contents) != "Hello World :)" {
+		t.Errorf("decrypted message is wrong: %s", contents)
+	}
+	if md.SignatureError != nil {
+		t.Error("expected no signature error, got:", md.SignatureError)
+	}
+}

openpgp/read_write_test_data.go

@@ -334,3 +334,124 @@ AtNTq6ihLMD5v1d82ZC7tNatdlDMGWnIdvEMCv2GZcuIqDQ9rXWs49e7tq1NncLY
 hz3tYjKhoFTKEIq3y3Pp
 =h/aX
 -----END PGP PUBLIC KEY BLOCK-----`
+
+const keyv5Test = `-----BEGIN PGP PRIVATE KEY BLOCK-----
+Comment: Bob's OpenPGP Transferable Secret Key
+
+lQVYBF2lnPIBDAC5cL9PQoQLTMuhjbYvb4Ncuuo0bfmgPRFywX53jPhoFf4Zg6mv
+/seOXpgecTdOcVttfzC8ycIKrt3aQTiwOG/ctaR4Bk/t6ayNFfdUNxHWk4WCKzdz
+/56fW2O0F23qIRd8UUJp5IIlN4RDdRCtdhVQIAuzvp2oVy/LaS2kxQoKvph/5pQ/
+5whqsyroEWDJoSV0yOb25B/iwk/pLUFoyhDG9bj0kIzDxrEqW+7Ba8nocQlecMF3
+X5KMN5kp2zraLv9dlBBpWW43XktjcCZgMy20SouraVma8Je/ECwUWYUiAZxLIlMv
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+=miES
+-----END PGP PRIVATE KEY BLOCK-----
+`
+
+const certv5Test = `-----BEGIN PGP PRIVATE KEY BLOCK-----
+
+lGEFXJH05BYAAAAtCSsGAQQB2kcPAQEHQFhZlVcVVtwf+21xNQPX+ecMJJBL0MPd
+fj75iux+my8QAAAAAAAiAQCHZ1SnSUmWqxEsoI6facIVZQu6mph3cBFzzTvcm5lA
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+AQgHAAAAAAAiAP9OdAPppjU1WwpqjIItkxr+VPQRT8Zm/Riw7U3F6v3OiBFHiHoF
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+TcIYl5/Uyoi+FOvPLcNw4hOv2nwUzSSVAw==
+=IiS2
+-----END PGP PRIVATE KEY BLOCK-----
+`
+
+const msgv5Test = `-----BEGIN PGP MESSAGE-----
+
+wcDMA3wvqk35PDeyAQv+PcQiLsoYTH30nJYQh3j3cJaO2+jErtVCrIQRIU0+
+rmgMddERYST4A9mA0DQIiTI4FQ0Lp440D3BWCgpq3LlNWewGzduaWwym5rN6
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+byVJHvLO/XErtC+GNIJeMg==
+=liRq
+-----END PGP MESSAGE-----
+`

openpgp/write.go

@@ -333,7 +333,7 @@ func writeAndSign(payload io.WriteCloser, candidateHashes []uint8, signed *Entit
 			return nil, err
 		}
 		metadata := &packet.LiteralData{
-			Format:   't',
+			Format:   'u',
 			FileName: hints.FileName,
 			Time:     epochSeconds,
 		}