1 files changed, 162 insertions, 0 deletions

diff --git a/vendor/golang.org/x/crypto/openpgp/packet/opaque.go b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go
new file mode 100644
index 0000000..456d807
--- /dev/null
+++ b/vendor/golang.org/x/crypto/openpgp/packet/opaque.go
@@ -0,0 +1,162 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+        "bytes"
+        "io"
+        "io/ioutil"
+
+        "golang.org/x/crypto/openpgp/errors"
+)
+
+// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is
+// useful for splitting and storing the original packet contents separately,
+// handling unsupported packet types or accessing parts of the packet not yet
+// implemented by this package.
+type OpaquePacket struct {
+        // Packet type
+        Tag uint8
+        // Reason why the packet was parsed opaquely
+        Reason error
+        // Binary contents of the packet data
+        Contents []byte
+}
+
+func (op *OpaquePacket) parse(r io.Reader) (err error) {
+        op.Contents, err = ioutil.ReadAll(r)
+        return
+}
+
+// Serialize marshals the packet to a writer in its original form, including
+// the packet header.
+func (op *OpaquePacket) Serialize(w io.Writer) (err error) {
+        err = serializeHeader(w, packetType(op.Tag), len(op.Contents))
+        if err == nil {
+                _, err = w.Write(op.Contents)
+        }
+        return
+}
+
+// Parse attempts to parse the opaque contents into a structure supported by
+// this package. If the packet is not known then the result will be another
+// OpaquePacket.
+func (op *OpaquePacket) Parse() (p Packet, err error) {
+        hdr := bytes.NewBuffer(nil)
+        err = serializeHeader(hdr, packetType(op.Tag), len(op.Contents))
+        if err != nil {
+                op.Reason = err
+                return op, err
+        }
+        p, err = Read(io.MultiReader(hdr, bytes.NewBuffer(op.Contents)))
+        if err != nil {
+                op.Reason = err
+                p = op
+        }
+        return
+}
+
+// OpaqueReader reads OpaquePackets from an io.Reader.
+type OpaqueReader struct {
+        r io.Reader
+}
+
+func NewOpaqueReader(r io.Reader) *OpaqueReader {
+        return &OpaqueReader{r: r}
+}
+
+// Read the next OpaquePacket.
+func (or *OpaqueReader) Next() (op *OpaquePacket, err error) {
+        tag, _, contents, err := readHeader(or.r)
+        if err != nil {
+                return
+        }
+        op = &OpaquePacket{Tag: uint8(tag), Reason: err}
+        err = op.parse(contents)
+        if err != nil {
+                consumeAll(contents)
+        }
+        return
+}
+
+// OpaqueSubpacket represents an unparsed OpenPGP subpacket,
+// as found in signature and user attribute packets.
+type OpaqueSubpacket struct {
+        SubType  uint8
+        Contents []byte
+}
+
+// OpaqueSubpackets extracts opaque, unparsed OpenPGP subpackets from
+// their byte representation.
+func OpaqueSubpackets(contents []byte) (result []*OpaqueSubpacket, err error) {
+        var (
+                subHeaderLen int
+                subPacket    *OpaqueSubpacket
+        )
+        for len(contents) > 0 {
+                subHeaderLen, subPacket, err = nextSubpacket(contents)
+                if err != nil {
+                        break
+                }
+                result = append(result, subPacket)
+                contents = contents[subHeaderLen+len(subPacket.Contents):]
+        }
+        return
+}
+
+func nextSubpacket(contents []byte) (subHeaderLen int, subPacket *OpaqueSubpacket, err error) {
+        // RFC 4880, section 5.2.3.1
+        var subLen uint32
+        if len(contents) < 1 {
+                goto Truncated
+        }
+        subPacket = &OpaqueSubpacket{}
+        switch {
+        case contents[0] < 192:
+                subHeaderLen = 2 // 1 length byte, 1 subtype byte
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[0])
+                contents = contents[1:]
+        case contents[0] < 255:
+                subHeaderLen = 3 // 2 length bytes, 1 subtype
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[0]-192)<<8 + uint32(contents[1]) + 192
+                contents = contents[2:]
+        default:
+                subHeaderLen = 6 // 5 length bytes, 1 subtype
+                if len(contents) < subHeaderLen {
+                        goto Truncated
+                }
+                subLen = uint32(contents[1])<<24 |
+                        uint32(contents[2])<<16 |
+                        uint32(contents[3])<<8 |
+                        uint32(contents[4])
+                contents = contents[5:]
+        }
+        if subLen > uint32(len(contents)) || subLen == 0 {
+                goto Truncated
+        }
+        subPacket.SubType = contents[0]
+        subPacket.Contents = contents[1:subLen]
+        return
+Truncated:
+        err = errors.StructuralError("subpacket truncated")
+        return
+}
+
+func (osp *OpaqueSubpacket) Serialize(w io.Writer) (err error) {
+        buf := make([]byte, 6)
+        n := serializeSubpacketLength(buf, len(osp.Contents)+1)
+        buf[n] = osp.SubType
+        if _, err = w.Write(buf[:n+1]); err != nil {
+                return
+        }
+        _, err = w.Write(osp.Contents)
+        return
+}