// readArmored reads an armored block with the given type.
func readArmored(r io.Reader, expectedType string) (body io.Reader, err error) {
block, err := armor.Decode(r)
if err != nil {
return
}
if block.Type != expectedType {
return nil, errors.InvalidArgumentError("expected '" + expectedType + "', got: " + block.Type)
}
return block.Body, nil
}
// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
block, err := armor.Decode(r)
if err == io.EOF {
return nil, errors.InvalidArgumentError("no armored data found")
}
if err != nil {
return nil, err
}
if block.Type != PublicKeyType && block.Type != PrivateKeyType {
return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
}
return ReadKeyRing(block.Body)
}
// Decode finds the first clearsigned message in data and returns it, as well
// as the suffix of data which remains after the message.
func Decode(data []byte) (b *Block, rest []byte) {
// start begins with a newline. However, at the very beginning of
// the byte array, we'll accept the start string without it.
rest = data
if bytes.HasPrefix(data, start[1:]) {
rest = rest[len(start)-1:]
} else if i := bytes.Index(data, start); i >= 0 {
rest = rest[i+len(start):]
} else {
return nil, data
}
// Consume the start line.
_, rest = getLine(rest)
var line []byte
b = &Block{
Headers: make(textproto.MIMEHeader),
}
// Next come a series of header lines.
for {
// This loop terminates because getLine's second result is
// always smaller than its argument.
if len(rest) == 0 {
return nil, data
}
// An empty line marks the end of the headers.
if line, rest = getLine(rest); len(line) == 0 {
break
}
i := bytes.Index(line, []byte{':'})
if i == -1 {
return nil, data
}
key, val := line[0:i], line[i+1:]
key = bytes.TrimSpace(key)
val = bytes.TrimSpace(val)
b.Headers.Add(string(key), string(val))
}
firstLine := true
for {
start := rest
line, rest = getLine(rest)
if bytes.Equal(line, endText) {
// Back up to the start of the line because armor expects to see the
// header line.
rest = start
break
}
// The final CRLF isn't included in the hash so we don't write it until
// we've seen the next line.
if firstLine {
firstLine = false
} else {
b.Bytes = append(b.Bytes, crlf...)
}
if bytes.HasPrefix(line, dashEscape) {
line = line[2:]
}
line = bytes.TrimRight(line, " \t")
b.Bytes = append(b.Bytes, line...)
b.Plaintext = append(b.Plaintext, line...)
b.Plaintext = append(b.Plaintext, lf)
}
// We want to find the extent of the armored data (including any newlines at
// the end).
i := bytes.Index(rest, end)
if i == -1 {
return nil, data
}
i += len(end)
for i < len(rest) && (rest[i] == '\r' || rest[i] == '\n') {
i++
}
armored := rest[:i]
rest = rest[i:]
var err error
b.ArmoredSignature, err = armor.Decode(bytes.NewBuffer(armored))
if err != nil {
return nil, data
}
return b, rest
}