// start is the marker which denotes the beginning of a clearsigned message.
		if i > 0 && data[i-1] == '\r' {
						return

		return "SHA512"
	h        hash.Hash
// and write it to w. If config is nil, sensible defaults are used.
var start = []byte("\n-----BEGIN PGP SIGNED MESSAGE-----")
		return "SHA1"
				d.atBeginningOfLine = false
	Plaintext        []byte               // The original message text
		return
			return
		if len(rest) == 0 {
	"hash"
		rest = rest[len(start)-1:]
				if _, err = d.buffered.Write(dashEscape); err != nil {
	"crypto"
		start := rest
	buffered *bufio.Writer
		buffered: buffered,
				// we need to write it out.
	if h == nil {
					return
	rest = rest[i:]
// Copyright 2012 The Go Authors. All rights reserved.

		hashType: hashType,

	return ""
		if line, rest = getLine(rest); len(line) == 0 {
		return nil, data
	sig := new(packet.Signature)
				d.h.Write(d.byteBuf)
	whitespace []byte

	privateKey *packet.PrivateKey
func Decode(data []byte) (b *Block, rest []byte) {
	"net/textproto"
// endText is a marker which denotes the end of the message and the start of
				d.atBeginningOfLine = false

			// At the beginning of a line, hyphens have to be escaped.
			rest = start

// Decode finds the first clearsigned message in data and returns it, as well
		if d.atBeginningOfLine {
	if bytes.HasPrefix(data, start[1:]) {

	var err error
		key = bytes.TrimSpace(key)
var lf = byte('\n')
		if i == -1 {
}
					d.whitespace = d.whitespace[:0]
	case crypto.SHA256:

	}
func (d *dashEscaper) Close() (err error) {
		return
	plaintext = &dashEscaper{
		if err = d.buffered.WriteByte(lf); err != nil {
	}
			} else {
		i = len(data)
	Bytes            []byte               // The signed message
	}
		}
				d.whitespace = d.whitespace[:0]
				if len(d.whitespace) > 0 {
// Encode returns a WriteCloser which will clear-sign a message with privateKey

	case crypto.SHA1:
	config     *packet.Config
				}
					if _, err = d.buffered.Write(d.whitespace); err != nil {
			if b == ' ' || b == '\t' || b == '\r' {
	if _, err = buffered.Write(start[1:]); err != nil {
	case crypto.MD5:
// A dashEscaper is an io.WriteCloser which processes the body of a clear-signed
	} else if i := bytes.Index(data, start); i >= 0 {
	Headers          textproto.MIMEHeader // Optional message headers

	sig.CreationTime = d.config.Now()
	"io"
				return
		return nil, errors.InvalidArgumentError("signing key is encrypted")
	if !d.atBeginningOfLine {
	}
	if err = d.buffered.Flush(); err != nil {
		return

	}
		j = i
		return
		return
		return "MD5"
	rest = data
		}
	if _, err = buffered.WriteString(name); err != nil {

// license that can be found in the LICENSE file.
// message are kept in plaintext so that it can be read without special tools.
	// We want to find the extent of the armored data (including any newlines at
				if err = d.buffered.WriteByte(b); err != nil {
// an armored signature.
		j = i + 1


		if bytes.Equal(line, endText) {

	b.ArmoredSignature, err = armor.Decode(bytes.NewBuffer(armored))
	} else {
		d.byteBuf[0] = b
			if !d.isFirstLine {
		// The final CRLF isn't included in the hash so we don't write it until
	byteBuf    []byte // a one byte buffer to save allocations
	sig.IssuerKeyId = &d.privateKey.KeyId
	}
				// Any buffered whitespace wasn't at the end of the line so
import (
	if err != nil {
	}
	} else {

		}

		atBeginningOfLine: true,

	case crypto.RIPEMD160:

		isFirstLine:       true,
			if b == '-' {
					d.h.Write(d.whitespace)
	if err = sig.Sign(d.h, d.privateKey, d.config); err != nil {
	}
					}
			break
// for signing, is maintained in h.
		return
// Use of this source code is governed by a BSD-style
type dashEscaper struct {
	return
	"bufio"
			b.Bytes = append(b.Bytes, crlf...)
				d.h.Write(d.byteBuf)
// RFC 4880, section 7.
			}
type Block struct {

	hashType crypto.Hash

	case crypto.SHA512:
func Encode(w io.Writer, privateKey *packet.PrivateKey, config *packet.Config) (plaintext io.WriteCloser, err error) {
// always be smaller than the original argument.
				d.h.Write(d.byteBuf)
		return
func getLine(data []byte) (line, rest []byte) {
	hashType := config.Hash()
		Headers: make(textproto.MIMEHeader),
var crlf = []byte("\r\n")
	if err = sig.Serialize(out); err != nil {
			i--
		rest = rest[i+len(start):]
	}
	sig.Hash = d.hashType

	// start begins with a newline. However, at the very beginning of
		return
		// An empty line marks the end of the headers.
	return
	h := hashType.New()
		}
		b.Bytes = append(b.Bytes, line...)
				// CRLF.
// end is a marker which denotes the end of the armored signature.
	if i < 0 {
	i := bytes.Index(data, []byte{'\n'})

	}

	name := nameOfHash(hashType)
	}
	_, rest = getLine(rest)
				// The signature isn't calculated over the dash-escaped text so
			} else {
	}
	sig.PubKeyAlgo = d.privateKey.PubKeyAlgo
		return "RIPEMD160"
func (d *dashEscaper) Write(data []byte) (n int, err error) {
		return
	for {
// array. The line does not include the \r\n or \n. The remainder of the byte
	for {
				}
			if err = d.buffered.WriteByte(b); err != nil {
	if err = out.Close(); err != nil {
var end = []byte("\n-----END PGP SIGNATURE-----")
}
	if err = buffered.WriteByte(lf); err != nil {
				}
				d.h.Write(crlf)
		return

func nameOfHash(h crypto.Hash) string {
// nameOfHash returns the OpenPGP name for the given hash, or the empty string
		}
			// Back up to the start of the line because armor expects to see the
	if privateKey.Encrypted {
				// the escape is only written to buffered.
// as the suffix of data which remains after the message.

	}
		config:     config,
// Package clearsign generates and processes OpenPGP, clear-signed data. See
	}
			// Any whitespace at the end of the line has to be removed so we
}
		i++

}
	// the end).
		val = bytes.TrimSpace(val)

	case crypto.SHA384:
	if _, err = buffered.WriteString("Hash: "); err != nil {
package clearsign
		b.Plaintext = append(b.Plaintext, lf)
	i := bytes.Index(rest, end)
	if len(name) == 0 {
	out, err := armor.Encode(d.buffered, "PGP SIGNATURE", nil)
					return
		return nil, data
				// We dely writing CRLF to the hash until the start of the
				// next line.
		}
		}
// A Block represents a clearsigned message. A signature on a Block can
}
// can't be confused with endText.

// be checked by passing Bytes into openpgp.CheckDetachedSignature.
		b.Headers.Add(string(key), string(val))
	// Next come a series of header lines.
	if err = buffered.WriteByte(lf); err != nil {
	var j int
	return
	var line []byte

			}
	ArmoredSignature *armor.Block         // The signature block
		return nil, errors.UnsupportedError("unknown hash type: " + strconv.Itoa(int(hashType)))
		return nil, data
	if err != nil {
// if the name isn't known. See RFC 4880, section 9.4.
			d.isFirstLine = false
	"bytes"
	// start has a \n at the beginning that we don't want here.
	if i == -1 {
	// Consume the start line.
// When closed, an armored signature is created and written to complete the
				d.whitespace = append(d.whitespace, b)
	}
	// the byte array, we'll accept the start string without it.

}
		line, rest = getLine(rest)

				}
	}
		// always smaller than its argument.
	"strconv"
		// This loop terminates because getLine's second result is
	}
	}
}
		// we've seen the next line.
// Clearsigned messages are cryptographically signed, but the contents of the
	}

		i := bytes.Index(line, []byte{':'})
				if err = d.buffered.WriteByte(b); err != nil {

	atBeginningOfLine bool
// message.
	isFirstLine       bool

	"code.google.com/p/go.crypto/openpgp/errors"
		byteBuf: make([]byte, 1),
				// We got a raw \n. Drop any trailing whitespace and write a
//
	switch h {
		return "SHA256"
		return
			} else if b == '\n' {

			// header line.
	sig.SigType = packet.SigTypeText
	"code.google.com/p/go.crypto/openpgp/packet"
		if bytes.HasPrefix(line, dashEscape) {
	buffered := bufio.NewWriter(w)
				// Nothing to do because we dely writing CRLF to the hash.
			}
	i += len(end)
		h:        h,
	}
			line = line[2:]

		b.Plaintext = append(b.Plaintext, line...)
			}
		privateKey: privateKey,
	}
	b = &Block{
	if err = buffered.WriteByte(lf); err != nil {
	}
	case crypto.SHA224:
	}
	return data[0:i], data[j:]
// getLine returns the first \r\n or \n delineated line from the given byte
					return
			// until this point (the start of the next line) before writing it.
			} else if b == '\n' {

			return nil, data
)


	for i < len(rest) && (rest[i] == '\r' || rest[i] == '\n') {
	n = len(data)
			return nil, data

	}
			// The final CRLF isn't included in the hash so we have to wait
		key, val := line[0:i], line[i+1:]
	"code.google.com/p/go.crypto/openpgp/armor"
			break

		if len(b.Bytes) > 0 {
		}
	return b, rest
	for _, b := range data {
//
	}
var dashEscape = []byte("- ")
// message. The clear-signed message is written to buffered and a hash, suitable
		return "SHA384"
	}

				d.atBeginningOfLine = true
		return "SHA224"
// array (also not including the new line bytes) is also returned and this will
			// buffer it until we find out whether there's more on this line.
// dashEscape is prefixed to any lines that begin with a hypen so that they
	armored := rest[:i]
var endText = []byte("-----BEGIN PGP SIGNATURE-----")
}
		line = bytes.TrimRight(line, " \t")

		return nil, errors.UnsupportedError("unsupported hash type: " + strconv.Itoa(int(hashType)))
		}

		} else {