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![Paddy](/assets/img/avatar_default.png)
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
254 lines
5.8 KiB
Go
254 lines
5.8 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
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// very similar to PEM except that it has an additional CRC checksum.
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package armor // import "github.com/keybase/go-crypto/openpgp/armor"
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import (
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"bufio"
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"bytes"
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"encoding/base64"
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"io"
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"strings"
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"unicode"
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"github.com/keybase/go-crypto/openpgp/errors"
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)
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// A Block represents an OpenPGP armored structure.
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//
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// The encoded form is:
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// -----BEGIN Type-----
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// Headers
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//
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// base64-encoded Bytes
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// '=' base64 encoded checksum
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// -----END Type-----
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// where Headers is a possibly empty sequence of Key: Value lines.
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//
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// Since the armored data can be very large, this package presents a streaming
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// interface.
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type Block struct {
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Type string // The type, taken from the preamble (i.e. "PGP SIGNATURE").
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Header map[string]string // Optional headers.
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Body io.Reader // A Reader from which the contents can be read
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lReader lineReader
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oReader openpgpReader
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}
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var ArmorCorrupt error = errors.StructuralError("armor invalid")
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const crc24Init = 0xb704ce
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const crc24Poly = 0x1864cfb
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const crc24Mask = 0xffffff
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// crc24 calculates the OpenPGP checksum as specified in RFC 4880, section 6.1
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func crc24(crc uint32, d []byte) uint32 {
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for _, b := range d {
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crc ^= uint32(b) << 16
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for i := 0; i < 8; i++ {
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crc <<= 1
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if crc&0x1000000 != 0 {
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crc ^= crc24Poly
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}
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}
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}
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return crc
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}
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var armorStart = []byte("-----BEGIN ")
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var armorEnd = []byte("-----END ")
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var armorEndOfLine = []byte("-----")
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// lineReader wraps a line based reader. It watches for the end of an armor
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// block and records the expected CRC value.
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type lineReader struct {
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in *bufio.Reader
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buf []byte
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eof bool
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crc *uint32
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}
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// ourIsSpace checks if a rune is either space according to unicode
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// package, or ZeroWidthSpace (which is not a space according to
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// unicode module). Used to trim lines during header reading.
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func ourIsSpace(r rune) bool {
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return r == '\u200b' || unicode.IsSpace(r)
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}
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func (l *lineReader) Read(p []byte) (n int, err error) {
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if l.eof {
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return 0, io.EOF
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}
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if len(l.buf) > 0 {
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n = copy(p, l.buf)
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l.buf = l.buf[n:]
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return
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}
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line, _, err := l.in.ReadLine()
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if err != nil {
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return
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}
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// Entry-level cleanup, just trim spaces.
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line = bytes.TrimFunc(line, ourIsSpace)
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if len(line) == 5 && line[0] == '=' {
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// This is the checksum line
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var expectedBytes [3]byte
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var m int
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m, err = base64.StdEncoding.Decode(expectedBytes[0:], line[1:])
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if m != 3 || err != nil {
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return
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}
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crc := uint32(expectedBytes[0])<<16 |
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uint32(expectedBytes[1])<<8 |
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uint32(expectedBytes[2])
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l.crc = &crc
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for {
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line, _, err = l.in.ReadLine()
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if err == io.EOF {
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break
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}
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if err != nil {
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return
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}
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if len(strings.TrimSpace(string(line))) > 0 {
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break
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}
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}
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if !bytes.HasPrefix(line, armorEnd) {
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return 0, ArmorCorrupt
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}
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l.eof = true
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return 0, io.EOF
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}
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if bytes.HasPrefix(line, armorEnd) {
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// Unexpected ending, there was no checksum.
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l.eof = true
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l.crc = nil
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return 0, io.EOF
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}
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// Clean-up line from whitespace to pass it further (to base64
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// decoder). This is done after test for CRC and test for
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// armorEnd. Keys that have whitespace in CRC will have CRC
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// treated as part of the payload and probably fail in base64
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// reading.
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line = bytes.Map(func(r rune) rune {
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if ourIsSpace(r) {
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return -1
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}
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return r
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}, line)
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n = copy(p, line)
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bytesToSave := len(line) - n
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if bytesToSave > 0 {
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if cap(l.buf) < bytesToSave {
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l.buf = make([]byte, 0, bytesToSave)
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}
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l.buf = l.buf[0:bytesToSave]
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copy(l.buf, line[n:])
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}
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return
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}
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// openpgpReader passes Read calls to the underlying base64 decoder, but keeps
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// a running CRC of the resulting data and checks the CRC against the value
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// found by the lineReader at EOF.
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type openpgpReader struct {
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lReader *lineReader
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b64Reader io.Reader
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currentCRC uint32
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}
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func (r *openpgpReader) Read(p []byte) (n int, err error) {
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n, err = r.b64Reader.Read(p)
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r.currentCRC = crc24(r.currentCRC, p[:n])
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if err == io.EOF {
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if r.lReader.crc != nil && *r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
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return 0, ArmorCorrupt
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}
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}
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return
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}
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// Decode reads a PGP armored block from the given Reader. It will ignore
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// leading garbage. If it doesn't find a block, it will return nil, io.EOF. The
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// given Reader is not usable after calling this function: an arbitrary amount
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// of data may have been read past the end of the block.
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func Decode(in io.Reader) (p *Block, err error) {
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r := bufio.NewReaderSize(in, 100)
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var line []byte
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ignoreNext := false
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TryNextBlock:
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p = nil
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// Skip leading garbage
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for {
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ignoreThis := ignoreNext
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line, ignoreNext, err = r.ReadLine()
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if err != nil {
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return
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}
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if ignoreNext || ignoreThis {
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continue
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}
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line = bytes.TrimSpace(line)
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if len(line) > len(armorStart)+len(armorEndOfLine) && bytes.HasPrefix(line, armorStart) {
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break
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}
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}
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p = new(Block)
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p.Type = string(line[len(armorStart) : len(line)-len(armorEndOfLine)])
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p.Header = make(map[string]string)
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nextIsContinuation := false
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var lastKey string
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// Read headers
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for {
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isContinuation := nextIsContinuation
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line, nextIsContinuation, err = r.ReadLine()
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if err != nil {
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p = nil
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return
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}
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if isContinuation {
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p.Header[lastKey] += string(line)
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continue
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}
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line = bytes.TrimFunc(line, ourIsSpace)
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if len(line) == 0 {
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break
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}
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i := bytes.Index(line, []byte(": "))
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if i == -1 {
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goto TryNextBlock
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}
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lastKey = string(line[:i])
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p.Header[lastKey] = string(line[i+2:])
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}
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p.lReader.in = r
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p.oReader.currentCRC = crc24Init
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p.oReader.lReader = &p.lReader
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p.oReader.b64Reader = base64.NewDecoder(base64.StdEncoding, &p.lReader)
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p.Body = &p.oReader
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return
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}
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