crypto/openpgp: bug fixes and fix misnamed function.

R=rsc, bradfitzwork
CC=golang-dev
https://golang.org/cl/4244066

src/pkg/crypto/openpgp/packet/packet.go

@@ -169,7 +169,7 @@ func readHeader(r io.Reader) (tag packetType, length int64, contents io.Reader,
 // serialiseHeader writes an OpenPGP packet header to w. See RFC 4880, section
 // 4.2.
 func serialiseHeader(w io.Writer, ptype packetType, length int) (err os.Error) {
-	var buf [5]byte
+	var buf [6]byte
 	var n int
 
 	buf[0] = 0x80 | 0x40 | byte(ptype)
@@ -178,16 +178,16 @@ func serialiseHeader(w io.Writer, ptype packetType, length int) (err os.Error) {
 		n = 2
 	} else if length < 8384 {
 		length -= 192
-		buf[1] = byte(length >> 8)
+		buf[1] = 192 + byte(length>>8)
 		buf[2] = byte(length)
 		n = 3
 	} else {
-		buf[0] = 255
-		buf[1] = byte(length >> 24)
-		buf[2] = byte(length >> 16)
-		buf[3] = byte(length >> 8)
-		buf[4] = byte(length)
-		n = 5
+		buf[1] = 255
+		buf[2] = byte(length >> 24)
+		buf[3] = byte(length >> 16)
+		buf[4] = byte(length >> 8)
+		buf[5] = byte(length)
+		n = 6
 	}
 
 	_, err = w.Write(buf[:n])

src/pkg/crypto/openpgp/packet/packet_test.go

@@ -190,3 +190,23 @@ func TestReadHeader(t *testing.T) {
 		}
 	}
 }
+
+func TestSerialiseHeader(t *testing.T) {
+	tag := packetTypePublicKey
+	lengths := []int{0, 1, 2, 64, 192, 193, 8000, 8384, 8385, 10000}
+
+	for _, length := range lengths {
+		buf := bytes.NewBuffer(nil)
+		serialiseHeader(buf, tag, length)
+		tag2, length2, _, err := readHeader(buf)
+		if err != nil {
+			t.Errorf("length %d, err: %s", length, err)
+		}
+		if tag2 != tag {
+			t.Errorf("length %d, tag incorrect (got %d, want %d)", length, tag2, tag)
+		}
+		if int(length2) != length {
+			t.Errorf("length %d, length incorrect (got %d)", length, length2)
+		}
+	}
+}

src/pkg/crypto/openpgp/write.go

@@ -39,7 +39,7 @@ func DetachSignText(w io.Writer, signer *Entity, message io.Reader) os.Error {
 // ArmoredDetachSignText signs message (after canonicalising the line endings)
 // with the private key from signer (which must already have been decrypted)
 // and writes an armored signature to w.
-func SignTextDetachedArmored(w io.Writer, signer *Entity, message io.Reader) os.Error {
+func ArmoredDetachSignText(w io.Writer, signer *Entity, message io.Reader) os.Error {
 	return armoredDetachSign(w, signer, message, packet.SigTypeText)
 }