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//! I/O helper structs for the age ASCII armor format.
use base64::{prelude::BASE64_STANDARD, Engine};
use pin_project::pin_project;
use std::cmp;
use std::error;
use std::fmt;
use std::io::{self, BufRead, BufReader, Read, Seek, SeekFrom, Write};
use zeroize::Zeroizing;
use crate::util::LINE_ENDING;
#[cfg(feature = "async")]
use futures::{
io::{AsyncBufRead, AsyncRead, AsyncWrite, BufReader as AsyncBufReader, Error},
ready,
task::{Context, Poll},
};
#[cfg(feature = "async")]
use std::mem;
#[cfg(feature = "async")]
use std::ops::DerefMut;
#[cfg(feature = "async")]
use std::pin::Pin;
#[cfg(feature = "async")]
use std::str;
const ARMORED_COLUMNS_PER_LINE: usize = 64;
const ARMORED_BYTES_PER_LINE: usize = ARMORED_COLUMNS_PER_LINE / 4 * 3;
const ARMORED_BEGIN_MARKER: &str = "-----BEGIN AGE ENCRYPTED FILE-----";
const ARMORED_END_MARKER: &str = "-----END AGE ENCRYPTED FILE-----";
const MIN_ARMOR_LEN: usize = 36; // ARMORED_BEGIN_MARKER.len() + 2
const BASE64_CHUNK_SIZE_COLUMNS: usize = 8 * 1024;
const BASE64_CHUNK_SIZE_BYTES: usize = BASE64_CHUNK_SIZE_COLUMNS / 4 * 3;
/// Specifies the format that [`ArmoredWriter`] should apply to its output.
pub enum Format {
/// age binary format.
Binary,
/// ASCII armored format.
AsciiArmor,
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
struct EncodedLine {
bytes: Vec<u8>,
offset: usize,
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
struct EncodedBytes {
offset: usize,
end: usize,
}
#[pin_project(project = LineEndingWriterProj)]
pub(crate) struct LineEndingWriter<W> {
#[pin]
inner: W,
buf: Vec<u8>,
total_written: usize,
/// None if `AsyncWrite::poll_closed` has been called.
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
line: Option<Vec<u8>>,
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
line_with_ending: Option<EncodedLine>,
}
impl<W: Write> LineEndingWriter<W> {
fn new(mut inner: W) -> io::Result<Self> {
// Write the begin marker
inner.write_all(ARMORED_BEGIN_MARKER.as_bytes())?;
inner.write_all(LINE_ENDING.as_bytes())?;
Ok(LineEndingWriter {
inner,
buf: Vec::with_capacity(8 * 1024),
total_written: 0,
#[cfg(feature = "async")]
line: None,
#[cfg(feature = "async")]
line_with_ending: None,
})
}
fn flush_buffered(&mut self) -> io::Result<()> {
self.inner.write_all(&self.buf)?;
self.total_written += self.buf.len();
self.buf.clear();
Ok(())
}
fn finish(mut self) -> io::Result<W> {
// Ensure all bytes have been written.
self.flush_buffered()?;
// Write the end marker
self.inner.write_all(LINE_ENDING.as_bytes())?;
self.inner.write_all(ARMORED_END_MARKER.as_bytes())?;
self.inner.write_all(LINE_ENDING.as_bytes())?;
Ok(self.inner)
}
}
impl<W: Write> Write for LineEndingWriter<W> {
fn write(&mut self, mut buf: &[u8]) -> io::Result<usize> {
if buf.is_empty() {
return Ok(0);
}
let written = buf.len();
while !buf.is_empty() {
let remaining =
ARMORED_COLUMNS_PER_LINE - (self.total_written % ARMORED_COLUMNS_PER_LINE);
// Write the next newline if we are at the end of the line.
if remaining == ARMORED_COLUMNS_PER_LINE && self.total_written > 0 {
self.buf.extend_from_slice(LINE_ENDING.as_bytes());
}
let to_write = cmp::min(remaining, buf.len());
self.buf.extend_from_slice(&buf[..to_write]);
buf = &buf[to_write..];
self.total_written += to_write;
}
// Write the buffer to the inner writer, and drop the written bytes. We trigger
// this when we are close to the buffer's capacity, to avoid reallocation.
if self.buf.len() + 1024 > self.buf.capacity() {
let inner_written = self.inner.write(&self.buf)?;
let mut i = 0;
self.buf.retain(|_| {
let b = i >= inner_written;
i += 1;
b
});
}
// We always return the number of bytes we consumed, not how many we actually
// wrote to the inner writer. Any discrepancy is handled in self.flush().
Ok(written)
}
fn flush(&mut self) -> io::Result<()> {
self.flush_buffered()?;
self.inner.flush()
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<W: AsyncWrite> LineEndingWriter<W> {
fn new_async(inner: W) -> Self {
// Write the begin marker
let bytes = [ARMORED_BEGIN_MARKER.as_bytes(), LINE_ENDING.as_bytes()].concat();
LineEndingWriter {
inner,
buf: vec![],
total_written: 0,
line: Some(Vec::with_capacity(ARMORED_COLUMNS_PER_LINE)),
line_with_ending: Some(EncodedLine { bytes, offset: 0 }),
}
}
fn poll_flush_line(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
let LineEndingWriterProj {
mut inner,
line_with_ending,
..
} = self.project();
if let Some(line) = line_with_ending {
loop {
line.offset += ready!(inner.as_mut().poll_write(cx, &line.bytes[line.offset..]))?;
if line.offset == line.bytes.len() {
break;
}
}
}
*line_with_ending = None;
Poll::Ready(Ok(()))
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<W: AsyncWrite> AsyncWrite for LineEndingWriter<W> {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
mut buf: &[u8],
) -> Poll<io::Result<usize>> {
ready!(self.as_mut().poll_flush_line(cx))?;
let this = self.as_mut().project();
if let Some(line) = this.line {
let mut to_write = ARMORED_COLUMNS_PER_LINE - line.len();
if to_write > buf.len() {
to_write = buf.len()
}
line.extend_from_slice(&buf[..to_write]);
buf = &buf[to_write..];
// At this point, either buf is empty, or we have a complete line.
assert!(buf.is_empty() || line.len() == ARMORED_COLUMNS_PER_LINE);
// Only add a line ending if we have more data to write, as the last
// line must be written in poll_close().
if !buf.is_empty() {
*this.line_with_ending = Some(EncodedLine {
bytes: [line, LINE_ENDING.as_bytes()].concat(),
offset: 0,
});
line.clear();
}
Poll::Ready(Ok(to_write))
} else {
Poll::Ready(Err(io::Error::new(
io::ErrorKind::WriteZero,
"AsyncWrite::poll_closed has been called",
)))
}
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
ready!(self.as_mut().poll_flush_line(cx))?;
self.project().inner.poll_flush(cx)
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
// Flush any remaining line bytes.
ready!(self.as_mut().poll_flush_line(cx))?;
let this = self.as_mut().project();
if let Some(line) = this.line {
// Finish the armored format with a partial line (if necessary) and the end
// marker.
*this.line_with_ending = Some(EncodedLine {
bytes: [
line,
LINE_ENDING.as_bytes(),
ARMORED_END_MARKER.as_bytes(),
LINE_ENDING.as_bytes(),
]
.concat(),
offset: 0,
});
}
*this.line = None;
// Flush the final line (if we didn't in the first call).
ready!(self.as_mut().poll_flush_line(cx))?;
self.project().inner.poll_close(cx)
}
}
#[pin_project(project = ArmorIsProj)]
enum ArmorIs<W> {
Enabled {
#[pin]
inner: LineEndingWriter<W>,
byte_buf: Option<Vec<u8>>,
encoded_buf: Box<[u8; BASE64_CHUNK_SIZE_COLUMNS]>,
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
encoded_line: Option<EncodedBytes>,
},
Disabled {
#[pin]
inner: W,
},
}
/// Writer that optionally applies the age ASCII armor format.
///
/// # Examples
///
/// ```
/// # use std::io::Read;
/// use std::io::Write;
/// # use std::iter;
///
/// # fn run_main() -> Result<(), ()> {
/// # let identity = age::x25519::Identity::generate();
/// # let load_recipient = || Ok(identity.to_public());
/// let recipient = load_recipient()?;
/// let plaintext = b"Hello world!";
///
/// # fn encrypt(recipient: age::x25519::Recipient, plaintext: &[u8]) -> Result<Vec<u8>, age::EncryptError> {
/// let encrypted = {
/// let encryptor = age::Encryptor::with_recipients(vec![Box::new(recipient)])
/// .expect("we provided a recipient");
///
/// let mut encrypted = vec![];
/// let mut writer = encryptor.wrap_output(
/// age::armor::ArmoredWriter::wrap_output(
/// &mut encrypted,
/// age::armor::Format::AsciiArmor,
/// )?
/// )?;
/// writer.write_all(plaintext)?;
/// writer.finish()
/// .and_then(|armor| armor.finish())?;
///
/// encrypted
/// };
/// # Ok(encrypted)
/// # }
/// # fn decrypt(identity: age::x25519::Identity, encrypted: Vec<u8>) -> Result<Vec<u8>, age::DecryptError> {
/// # let decrypted = {
/// # let decryptor = match age::Decryptor::new(
/// # age::armor::ArmoredReader::new(&encrypted[..])
/// # )? {
/// # age::Decryptor::Recipients(d) => d,
/// # _ => unreachable!(),
/// # };
/// # let mut decrypted = vec![];
/// # let mut reader = decryptor.decrypt(iter::once(&identity as &dyn age::Identity))?;
/// # reader.read_to_end(&mut decrypted);
/// # decrypted
/// # };
/// # Ok(decrypted)
/// # }
/// # let decrypted = decrypt(
/// # identity,
/// # encrypt(recipient, &plaintext[..]).map_err(|_| ())?
/// # ).map_err(|_| ())?;
/// # assert_eq!(decrypted, plaintext);
/// # Ok(())
/// # }
/// # run_main().unwrap();
/// ```
#[pin_project]
pub struct ArmoredWriter<W>(#[pin] ArmorIs<W>);
impl<W: Write> ArmoredWriter<W> {
/// Wraps the given output in an `ArmoredWriter` that will apply the given [`Format`].
pub fn wrap_output(output: W, format: Format) -> io::Result<Self> {
match format {
Format::AsciiArmor => LineEndingWriter::new(output).map(|w| {
ArmoredWriter(ArmorIs::Enabled {
inner: w,
byte_buf: Some(Vec::with_capacity(BASE64_CHUNK_SIZE_BYTES)),
encoded_buf: Box::new([0; BASE64_CHUNK_SIZE_COLUMNS]),
#[cfg(feature = "async")]
encoded_line: None,
})
}),
Format::Binary => Ok(ArmoredWriter(ArmorIs::Disabled { inner: output })),
}
}
/// Writes the end marker of the age file, if armoring was enabled.
///
/// You **MUST** call `finish` when you are done writing, in order to finish the
/// armoring process. Failing to call `finish` will result in a truncated file that
/// that will fail to decrypt.
pub fn finish(self) -> io::Result<W> {
match self.0 {
ArmorIs::Enabled {
mut inner,
byte_buf,
mut encoded_buf,
..
} => {
let byte_buf = byte_buf.unwrap();
let encoded = BASE64_STANDARD
.encode_slice(&byte_buf, &mut encoded_buf[..])
.expect("byte_buf.len() <= BASE64_CHUNK_SIZE_BYTES");
inner.write_all(&encoded_buf[..encoded])?;
inner.finish()
}
ArmorIs::Disabled { inner } => Ok(inner),
}
}
}
impl<W: Write> Write for ArmoredWriter<W> {
fn write(&mut self, mut buf: &[u8]) -> io::Result<usize> {
match &mut self.0 {
ArmorIs::Enabled {
inner,
byte_buf,
encoded_buf,
..
} => {
// Guaranteed to be Some (as long as async and sync writing isn't mixed),
// because ArmoredWriter::finish consumes self.
let byte_buf = byte_buf.as_mut().unwrap();
let mut written = 0;
loop {
let mut to_write = BASE64_CHUNK_SIZE_BYTES - byte_buf.len();
if to_write > buf.len() {
to_write = buf.len()
}
byte_buf.extend_from_slice(&buf[..to_write]);
buf = &buf[to_write..];
written += to_write;
// At this point, either buf is empty, or we have a full line.
assert!(buf.is_empty() || byte_buf.len() == BASE64_CHUNK_SIZE_BYTES);
// Only encode the line if we have more data to write, as the last
// (possibly-partial) line must be written in finish().
if buf.is_empty() {
break;
} else {
assert_eq!(
BASE64_STANDARD
.encode_slice(&byte_buf, &mut encoded_buf[..])
.expect("byte_buf.len() <= BASE64_CHUNK_SIZE_BYTES"),
BASE64_CHUNK_SIZE_COLUMNS
);
inner.write_all(&encoded_buf[..])?;
byte_buf.clear();
};
}
Ok(written)
}
ArmorIs::Disabled { inner } => inner.write(buf),
}
}
fn flush(&mut self) -> io::Result<()> {
match &mut self.0 {
ArmorIs::Enabled { inner, .. } => inner.flush(),
ArmorIs::Disabled { inner } => inner.flush(),
}
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<W: AsyncWrite> ArmoredWriter<W> {
/// Wraps the given output in an `ArmoredWriter` that will apply the given [`Format`].
pub fn wrap_async_output(output: W, format: Format) -> Self {
match format {
Format::AsciiArmor => ArmoredWriter(ArmorIs::Enabled {
inner: LineEndingWriter::new_async(output),
byte_buf: Some(Vec::with_capacity(BASE64_CHUNK_SIZE_BYTES)),
encoded_buf: Box::new([0; BASE64_CHUNK_SIZE_COLUMNS]),
encoded_line: None,
}),
Format::Binary => ArmoredWriter(ArmorIs::Disabled { inner: output }),
}
}
fn poll_flush_line(self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
if let ArmorIsProj::Enabled {
mut inner,
encoded_buf,
encoded_line,
..
} = self.project().0.project()
{
if let Some(line) = encoded_line {
loop {
line.offset += ready!(inner
.as_mut()
.poll_write(cx, &encoded_buf[line.offset..line.end]))?;
if line.offset == line.end {
break;
}
}
}
*encoded_line = None;
}
Poll::Ready(Ok(()))
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<W: AsyncWrite> AsyncWrite for ArmoredWriter<W> {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context,
mut buf: &[u8],
) -> Poll<io::Result<usize>> {
ready!(self.as_mut().poll_flush_line(cx))?;
match self.project().0.project() {
ArmorIsProj::Enabled {
byte_buf,
encoded_buf,
encoded_line,
..
} => {
if let Some(byte_buf) = byte_buf {
let mut to_write = BASE64_CHUNK_SIZE_BYTES - byte_buf.len();
if to_write > buf.len() {
to_write = buf.len()
}
byte_buf.extend_from_slice(&buf[..to_write]);
buf = &buf[to_write..];
// At this point, either buf is empty, or we have a full line.
assert!(buf.is_empty() || byte_buf.len() == BASE64_CHUNK_SIZE_BYTES);
// Only encode the line if we have more data to write, as the last
// line must be written in poll_close().
if !buf.is_empty() {
assert_eq!(
BASE64_STANDARD
.encode_slice(&byte_buf, &mut encoded_buf[..],)
.expect("byte_buf.len() <= BASE64_CHUNK_SIZE_BYTES"),
ARMORED_COLUMNS_PER_LINE
);
*encoded_line = Some(EncodedBytes {
offset: 0,
end: ARMORED_COLUMNS_PER_LINE,
});
byte_buf.clear();
}
Poll::Ready(Ok(to_write))
} else {
Poll::Ready(Err(io::Error::new(
io::ErrorKind::WriteZero,
"AsyncWrite::poll_closed has been called",
)))
}
}
ArmorIsProj::Disabled { inner } => inner.poll_write(cx, buf),
}
}
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<io::Result<()>> {
ready!(self.as_mut().poll_flush_line(cx))?;
match self.project().0.project() {
ArmorIsProj::Enabled { inner, .. } => inner.poll_flush(cx),
ArmorIsProj::Disabled { inner } => inner.poll_flush(cx),
}
}
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
// Flush any remaining encoded line bytes.
ready!(self.as_mut().poll_flush_line(cx))?;
if let ArmorIsProj::Enabled {
byte_buf,
encoded_buf,
encoded_line,
..
} = self.as_mut().project().0.project()
{
if let Some(byte_buf) = byte_buf {
// Finish the armored format with a partial line (if necessary) and the end
// marker.
let encoded = BASE64_STANDARD
.encode_slice(&byte_buf, &mut encoded_buf[..])
.expect("byte_buf.len() <= BASE64_CHUNK_SIZE_BYTES");
*encoded_line = Some(EncodedBytes {
offset: 0,
end: encoded,
});
}
*byte_buf = None;
}
// Flush the final chunk (if we didn't in the first call).
ready!(self.as_mut().poll_flush_line(cx))?;
match self.project().0.project() {
ArmorIsProj::Enabled { inner, .. } => inner.poll_close(cx),
ArmorIsProj::Disabled { inner } => inner.poll_close(cx),
}
}
}
/// The various errors that can be returned while parsing the armored format.
#[derive(Debug)]
pub enum ArmoredReadError {
/// An error occurred while parsing Base64.
Base64(base64::DecodeSliceError),
/// The begin marker for the armor is invalid.
InvalidBeginMarker,
/// Invalid UTF-8 characters were encountered between the begin and end marker.
InvalidUtf8,
/// A line of the armor contains a `\r` character.
LineContainsCr,
/// The final Base64 line is non-canonical.
MissingPadding,
/// The armor is not wrapped at 64 characters.
NotWrappedAt64Chars,
/// There is a short line in the middle of the armor (only the final line may be short).
ShortLineInMiddle,
/// There are trailing non-whitespace characters after the end marker.
TrailingGarbage,
}
impl fmt::Display for ArmoredReadError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
ArmoredReadError::Base64(e) => e.fmt(f),
ArmoredReadError::InvalidBeginMarker => write!(f, "invalid armor begin marker"),
ArmoredReadError::InvalidUtf8 => write!(f, "stream did not contain valid UTF-8"),
ArmoredReadError::LineContainsCr => write!(f, "line contains CR"),
ArmoredReadError::MissingPadding => {
write!(f, "invalid armor (last line is missing padding)")
}
ArmoredReadError::NotWrappedAt64Chars => {
write!(f, "invalid armor (not wrapped at 64 characters)")
}
ArmoredReadError::ShortLineInMiddle => {
write!(f, "invalid armor (short line in middle of encoding)")
}
ArmoredReadError::TrailingGarbage => {
write!(
f,
"invalid armor (non-whitespace characters after end marker)"
)
}
}
}
}
impl error::Error for ArmoredReadError {}
/// The position in the underlying reader corresponding to the start of the data inside
/// the armor.
///
/// To impl Seek for ArmoredReader, we need to know the point in the reader corresponding
/// to the first byte of the armored data. But we can't query the reader for its current
/// position without having a specific constructor for `R: Read + Seek`, which makes the
/// higher-level API more complex. Instead, we count the number of bytes that have been
/// read from the reader:
/// - If armor is enabled, we count starting from after the first line (which is the armor
/// begin marker).
/// - If armor is disabled, we count from the first byte we read.
///
/// Then when we first need to seek, inside `impl Seek` we can query the reader's current
/// position and figure out where the start was.
#[derive(Debug)]
enum StartPos {
/// An offset that we can subtract from the current position.
Implicit(u64),
/// The precise start position.
Explicit(u64),
}
/// Reader that will parse the age ASCII armor format if detected.
///
/// # Examples
///
/// ```
/// use std::io::Read;
/// # use std::io::Write;
/// use std::iter;
///
/// # fn run_main() -> Result<(), ()> {
/// # fn encrypt(recipient: age::x25519::Recipient, plaintext: &[u8]) -> Result<Vec<u8>, age::EncryptError> {
/// # let encrypted = {
/// # let encryptor = age::Encryptor::with_recipients(vec![Box::new(recipient)])
/// # .expect("we provided a recipient");
/// # let mut encrypted = vec![];
/// # let mut writer = encryptor.wrap_output(
/// # age::armor::ArmoredWriter::wrap_output(
/// # &mut encrypted,
/// # age::armor::Format::AsciiArmor,
/// # )?
/// # )?;
/// # writer.write_all(plaintext)?;
/// # writer.finish()
/// # .and_then(|armor| armor.finish())?;
/// # encrypted
/// # };
/// # Ok(encrypted)
/// # }
/// # let load_identity = || Ok(age::x25519::Identity::generate());
/// let identity = load_identity()?;
/// # let plaintext = b"Hello world!";
/// # let load_encrypted_file = || encrypt(identity.to_public(), &plaintext[..]).map_err(|_| ());
/// let encrypted = load_encrypted_file()?;
///
/// # fn decrypt(identity: age::x25519::Identity, encrypted: Vec<u8>) -> Result<Vec<u8>, age::DecryptError> {
/// let decrypted = {
/// let decryptor = match age::Decryptor::new(
/// age::armor::ArmoredReader::new(&encrypted[..])
/// )? {
/// age::Decryptor::Recipients(d) => d,
/// _ => unreachable!(),
/// };
///
/// let mut decrypted = vec![];
/// let mut reader = decryptor.decrypt(iter::once(&identity as &dyn age::Identity))?;
/// reader.read_to_end(&mut decrypted);
///
/// decrypted
/// };
/// # Ok(decrypted)
/// # }
/// # let decrypted = decrypt(identity, encrypted).map_err(|_| ())?;
/// # assert_eq!(decrypted, plaintext);
/// # Ok(())
/// # }
/// # run_main().unwrap();
/// ```
#[pin_project]
pub struct ArmoredReader<R> {
#[pin]
inner: R,
start: StartPos,
is_armored: Option<bool>,
line_buf: Zeroizing<String>,
byte_buf: Zeroizing<[u8; ARMORED_BYTES_PER_LINE]>,
byte_start: usize,
byte_end: usize,
found_short_line: bool,
found_end: bool,
data_len: Option<u64>,
data_read: usize,
}
impl<R: Read> ArmoredReader<BufReader<R>> {
/// Wraps a reader that may contain an armored age file.
pub fn new(reader: R) -> Self {
ArmoredReader::with_buffered(BufReader::new(reader))
}
}
#[cfg(feature = "cli-common")]
impl<R: BufRead> ArmoredReader<R> {
/// Wraps a buffered reader that may contain an armored age file.
pub(crate) fn new_buffered(reader: R) -> Self {
ArmoredReader::with_buffered(reader)
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncRead + Unpin> ArmoredReader<AsyncBufReader<R>> {
/// Wraps a reader that may contain an armored age file.
pub fn from_async_reader(inner: R) -> Self {
ArmoredReader::with_buffered(AsyncBufReader::new(inner))
}
}
impl<R> ArmoredReader<R> {
fn with_buffered(inner: R) -> Self {
ArmoredReader {
inner,
start: StartPos::Implicit(0),
is_armored: None,
line_buf: Zeroizing::new(String::with_capacity(ARMORED_COLUMNS_PER_LINE + 2)),
byte_buf: Zeroizing::new([0; ARMORED_BYTES_PER_LINE]),
byte_start: ARMORED_BYTES_PER_LINE,
byte_end: ARMORED_BYTES_PER_LINE,
found_short_line: false,
found_end: false,
data_len: None,
data_read: 0,
}
}
fn count_reader_bytes(&mut self, read: usize) -> usize {
// We only need to count if we haven't yet worked out the start position.
if let StartPos::Implicit(offset) = &mut self.start {
*offset += read as u64;
}
// Return the counted bytes for convenience.
read
}
/// Detects whether this is an armored age file.
///
/// We only use ArmoredReader to read age files, so we can rely on the following
/// properties:
///
/// - The first line of an armored age file is 35-36 bytes, depending on whether CRLF
/// or LF is used.
/// - A non-armored age file with a v1 header will be a minimum of 70 bytes (22-byte
/// version line, 48-byte MAC line).
/// - A non-armored age file with an unknown header version will be a minimum of 21
/// bytes (for a one-character version). However, assuming that age continues to
/// target at least the 128-bit security level, any future header version must
/// contain at least 16 more bytes, for a total minimum of 37 bytes.
///
/// We therefore read exactly 36 bytes from the underlying reader, and parse it within
/// the internal buffer to determine whether this is an armored age file.
fn detect_armor(&mut self) -> io::Result<()> {
if self.is_armored.is_some() {
panic!("ArmoredReader::detect_armor() called twice");
}
const MARKER_LEN: usize = MIN_ARMOR_LEN - 2;
// The first line of armor is the armor marker followed by either
// CRLF or LF.
let is_armored = &self.byte_buf[..MARKER_LEN] == ARMORED_BEGIN_MARKER.as_bytes();
if is_armored {
match (
&self.byte_buf[MARKER_LEN..=MARKER_LEN],
&self.byte_buf[MARKER_LEN..MIN_ARMOR_LEN],
) {
(b"\n", _) => {
// We read one extra byte. If this is a valid armored file, that byte
// is valid UTF-8, so we can move it into the line buffer.
self.line_buf.push_str(
std::str::from_utf8(&self.byte_buf[MARKER_LEN + 1..MIN_ARMOR_LEN])
.map_err(|_| {
io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::InvalidUtf8,
)
})?,
);
self.count_reader_bytes(1);
}
(_, b"\r\n") => (),
(_, _) => {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::InvalidBeginMarker,
))
}
}
} else {
// Not armored, so the first line is part of the data.
self.byte_start = 0;
self.byte_end = MIN_ARMOR_LEN;
self.count_reader_bytes(MIN_ARMOR_LEN);
}
self.is_armored = Some(is_armored);
Ok(())
}
/// Validates `self.line_buf` and parses it into `self.byte_buf`.
///
/// Returns `true` if this was the last line.
fn parse_armor_line(&mut self) -> io::Result<bool> {
// Handle line endings
let line = if self.line_buf.ends_with("\r\n") {
// trim_end_matches will trim the pattern repeatedly, but because
// BufRead::read_line splits on line endings, this will never occur.
self.line_buf.trim_end_matches("\r\n")
} else if self.line_buf.ends_with('\n') {
self.line_buf.trim_end_matches('\n')
} else {
// If the line does not end in a `\n`, then it must be the final line in the
// file, because we parse the file into lines by splitting on `\n`. This will
// either be an invalid line (and be caught as a different error), or the end
// marker (which we allow to omit a trailing `\n`).
&self.line_buf
};
if line.contains('\r') {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::LineContainsCr,
));
}
// Enforce canonical armor format
if line == ARMORED_END_MARKER {
// This line is the EOF marker; we are done!
self.found_end = true;
return Ok(true);
} else {
match (self.found_short_line, line.len()) {
(false, ARMORED_COLUMNS_PER_LINE) => (),
(false, n) if n % 4 != 0 => {
// The `base64` crate does not (yet) support canonical decoding.
// Handle this ourselves until the upstream issue is closed:
// https://github.com/marshallpierce/rust-base64/issues/182
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::MissingPadding,
));
}
(false, n) if n < ARMORED_COLUMNS_PER_LINE => {
// The format may contain a single short line at the end.
self.found_short_line = true;
}
(true, ARMORED_COLUMNS_PER_LINE) => {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::ShortLineInMiddle,
));
}
_ => {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::NotWrappedAt64Chars,
));
}
}
}
// Decode the line
self.byte_start = 0;
self.byte_end = BASE64_STANDARD
.decode_slice(line.as_bytes(), self.byte_buf.as_mut())
.map_err(|e| io::Error::new(io::ErrorKind::InvalidData, ArmoredReadError::Base64(e)))?;
// Finished with this buffered line!
self.line_buf.clear();
// We haven't found the end yet
Ok(false)
}
}
impl<R: BufRead> BufRead for ArmoredReader<R> {
fn fill_buf(&mut self) -> io::Result<&[u8]> {
loop {
match self.is_armored {
None => {
self.inner.read_exact(&mut self.byte_buf[..MIN_ARMOR_LEN])?;
self.detect_armor()?
}
Some(false) => {
break if self.byte_start >= self.byte_end {
self.inner.read(&mut self.byte_buf[..]).map(|read| {
self.byte_start = 0;
self.byte_end = read;
self.count_reader_bytes(read);
&self.byte_buf[..read]
})
} else {
Ok(&self.byte_buf[self.byte_start..self.byte_end])
}
}
Some(true) => {
break if self.found_end {
Ok(&[])
} else if self.byte_start >= self.byte_end {
if self.read_next_armor_line()? {
Ok(&[])
} else {
Ok(&self.byte_buf[self.byte_start..self.byte_end])
}
} else {
Ok(&self.byte_buf[self.byte_start..self.byte_end])
}
}
}
}
}
fn consume(&mut self, amt: usize) {
self.byte_start += amt;
self.data_read += amt;
assert!(self.byte_start <= self.byte_end);
}
}
impl<R: BufRead> ArmoredReader<R> {
/// Fills `self.byte_buf` with the next line of armored data.
///
/// Returns `true` if this was the last line.
fn read_next_armor_line(&mut self) -> io::Result<bool> {
assert_eq!(self.is_armored, Some(true));
// Read the next line
self.inner
.read_line(&mut self.line_buf)
.map(|read| self.count_reader_bytes(read))?;
// Parse the line into bytes
if self.parse_armor_line()? {
// This was the last line! Check for trailing garbage.
loop {
let amt = match self.inner.fill_buf()? {
&[] => break,
buf => {
if buf.iter().any(|b| !b.is_ascii_whitespace()) {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::TrailingGarbage,
));
}
buf.len()
}
};
self.inner.consume(amt);
}
Ok(true)
} else {
Ok(false)
}
}
}
impl<R: BufRead> Read for ArmoredReader<R> {
fn read(&mut self, mut buf: &mut [u8]) -> io::Result<usize> {
let buf_len = buf.len();
while !buf.is_empty() {
match self.fill_buf()? {
[] => break,
next => {
let read = cmp::min(next.len(), buf.len());
if next.len() < buf.len() {
buf[..read].copy_from_slice(next);
} else {
buf.copy_from_slice(&next[..read]);
}
self.consume(read);
buf = &mut buf[read..];
}
}
}
Ok(buf_len - buf.len())
}
}
/// Copied from `futures_util::io::read_until::read_until_internal`.
#[cfg(feature = "async")]
fn read_until_internal<R: AsyncBufRead + ?Sized>(
mut reader: Pin<&mut R>,
cx: &mut Context<'_>,
byte: u8,
buf: &mut Vec<u8>,
read: &mut usize,
) -> Poll<io::Result<usize>> {
loop {
let (done, used) = {
let available = ready!(reader.as_mut().poll_fill_buf(cx))?;
if let Some(i) = memchr::memchr(byte, available) {
buf.extend_from_slice(&available[..=i]);
(true, i + 1)
} else {
buf.extend_from_slice(available);
(false, available.len())
}
};
reader.as_mut().consume(used);
*read += used;
if done || used == 0 {
return Poll::Ready(Ok(mem::replace(read, 0)));
}
}
}
/// Adapted from `futures_util::io::read_line::read_line_internal`.
#[cfg(feature = "async")]
fn read_line_internal<R: AsyncBufRead + ?Sized>(
reader: Pin<&mut R>,
cx: &mut Context<'_>,
buf: &mut String,
bytes: &mut Vec<u8>,
read: &mut usize,
) -> Poll<io::Result<usize>> {
let ret = ready!(read_until_internal(reader, cx, b'\n', bytes, read));
match String::from_utf8(mem::take(bytes)) {
Err(_) => Poll::Ready(ret.and_then(|_| {
Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::InvalidUtf8,
))
})),
Ok(mut line) => {
debug_assert!(buf.is_empty());
debug_assert_eq!(*read, 0);
// Safety: `bytes` is a valid UTF-8 because `str::from_utf8` returned `Ok`.
mem::swap(buf, &mut line);
Poll::Ready(ret)
}
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncBufRead + Unpin> AsyncBufRead for ArmoredReader<R> {
fn poll_fill_buf(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<&[u8]>> {
loop {
match self.is_armored {
None => {
let mut this = self.as_mut().project();
let available = loop {
let buf = ready!(this.inner.as_mut().poll_fill_buf(cx))?;
if buf.len() >= MIN_ARMOR_LEN {
break buf;
}
};
this.byte_buf[..MIN_ARMOR_LEN].copy_from_slice(&available[..MIN_ARMOR_LEN]);
this.inner.as_mut().consume(MIN_ARMOR_LEN);
self.detect_armor()?
}
Some(false) => {
let ret = if self.byte_start >= self.byte_end {
let this = self.as_mut().project();
let read = ready!(this.inner.poll_read(cx, &mut this.byte_buf[..]))?;
(*this.byte_start) = 0;
(*this.byte_end) = read;
self.count_reader_bytes(read);
&self.get_mut().byte_buf[..read]
} else {
let this = self.get_mut();
&this.byte_buf[this.byte_start..this.byte_end]
};
break Poll::Ready(Ok(ret));
}
Some(true) if self.found_end => return Poll::Ready(Ok(&[])),
Some(true) => {
let ret = if self.byte_start >= self.byte_end {
let last =
ready!(Pin::new(self.deref_mut()).poll_read_next_armor_line(cx))?;
if last {
&[]
} else {
let this = self.get_mut();
&this.byte_buf[this.byte_start..this.byte_end]
}
} else {
let this = self.get_mut();
&this.byte_buf[this.byte_start..this.byte_end]
};
break Poll::Ready(Ok(ret));
}
}
}
}
fn consume(mut self: Pin<&mut Self>, amt: usize) {
let this = self.as_mut().project();
(*this.byte_start) += amt;
(*this.data_read) += amt;
assert!(this.byte_start <= this.byte_end);
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncBufRead + Unpin> ArmoredReader<R> {
/// Fills `self.byte_buf` with the next line of armored data.
///
/// Returns `true` if this was the last line.
fn poll_read_next_armor_line(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<io::Result<bool>> {
assert_eq!(self.is_armored, Some(true));
// Read the next line
{
// Emulates `AsyncBufReadExt::read_line`.
let mut this = self.as_mut().project();
let buf: &mut String = this.line_buf;
let mut bytes = mem::take(buf).into_bytes();
let mut read = 0;
ready!(read_line_internal(
this.inner.as_mut(),
cx,
buf,
&mut bytes,
&mut read,
))
}
.map(|read| self.count_reader_bytes(read))?;
// Parse the line into bytes.
if self.parse_armor_line()? {
// This was the last line! Check for trailing garbage.
let mut this = self.as_mut().project();
loop {
let amt = match ready!(this.inner.as_mut().poll_fill_buf(cx))? {
&[] => break,
buf => {
if buf.iter().any(|b| !b.is_ascii_whitespace()) {
return Poll::Ready(Err(io::Error::new(
io::ErrorKind::InvalidData,
ArmoredReadError::TrailingGarbage,
)));
}
buf.len()
}
};
this.inner.as_mut().consume(amt);
}
Poll::Ready(Ok(true))
} else {
Poll::Ready(Ok(false))
}
}
}
#[cfg(feature = "async")]
#[cfg_attr(docsrs, doc(cfg(feature = "async")))]
impl<R: AsyncBufRead + Unpin> AsyncRead for ArmoredReader<R> {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context,
mut buf: &mut [u8],
) -> Poll<Result<usize, Error>> {
let buf_len = buf.len();
while !buf.is_empty() {
match Pin::new(self.deref_mut()).poll_fill_buf(cx) {
Poll::Pending if buf_len > buf.len() => break,
Poll::Pending => return Poll::Pending,
Poll::Ready(Err(e)) => return Poll::Ready(Err(e)),
Poll::Ready(Ok([])) => break,
Poll::Ready(Ok(next)) => {
let read = cmp::min(next.len(), buf.len());
if next.len() < buf.len() {
buf[..read].copy_from_slice(next);
} else {
buf.copy_from_slice(&next[..read]);
}
Pin::new(self.deref_mut()).consume(read);
buf = &mut buf[read..];
}
}
}
Poll::Ready(Ok(buf_len - buf.len()))
}
}
impl<R: Read + Seek> ArmoredReader<R> {
fn start(&mut self) -> io::Result<u64> {
match self.start {
StartPos::Implicit(offset) => {
let current = self.inner.seek(SeekFrom::Current(0))?;
let start = current - offset;
// Cache the start for future calls.
self.start = StartPos::Explicit(start);
Ok(start)
}
StartPos::Explicit(start) => Ok(start),
}
}
}
impl<R: BufRead + Seek> Seek for ArmoredReader<R> {
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> {
loop {
match self.is_armored {
None => {
self.inner.read_exact(&mut self.byte_buf[..MIN_ARMOR_LEN])?;
self.detect_armor()?
}
Some(armored) => {
// Convert the offset into the target position within the data inside
// the (maybe) armor.
let start = self.start()?;
let target_pos = match pos {
SeekFrom::Start(offset) => offset,
SeekFrom::Current(offset) => {
let res = (self.data_read as i64) + offset;
if res >= 0_i64 {
res as u64
} else {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"cannot seek before the start",
));
}
}
SeekFrom::End(offset) => {
let data_len = match self.data_len {
Some(n) => n,
None => {
// Read from the source until we find the end.
let mut buf = [0; 4096];
while self.read(&mut buf)? > 0 {}
let data_len = self.data_read as u64;
// Cache the data length for future calls.
self.data_len = Some(data_len);
data_len
}
};
let res = (data_len as i64) + offset;
if res >= 0 {
res as u64
} else {
return Err(io::Error::new(
io::ErrorKind::InvalidData,
"cannot seek before the start",
));
}
}
};
if !armored {
// We can seek directly on the inner reader.
self.inner.seek(SeekFrom::Start(start + target_pos))?;
self.byte_start = 0;
self.byte_end = 0;
self.data_read = target_pos as usize;
break Ok(self.data_read as u64);
}
// Jump back to the start of the armor data, and then read and drop
// until we reach the target position. This is very inefficient, but
// as armored files can have arbitrary line endings within the file,
// we can't determine where the armor line containing the target
// position begins within the reader.
self.inner.seek(SeekFrom::Start(start))?;
self.line_buf.clear();
self.byte_start = ARMORED_BYTES_PER_LINE;
self.byte_end = ARMORED_BYTES_PER_LINE;
self.found_short_line = false;
self.found_end = false;
self.data_read = 0;
let mut buf = [0; 4096];
let mut to_read = target_pos as usize;
while to_read > buf.len() {
self.read_exact(&mut buf)?;
to_read -= buf.len();
}
if to_read > 0 {
self.read_exact(&mut buf[..to_read])?;
}
// All done!
break Ok(target_pos);
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::io::{Cursor, Read, Seek, SeekFrom, Write};
use super::{ArmoredReader, ArmoredWriter, Format, ARMORED_BYTES_PER_LINE};
#[cfg(feature = "async")]
use futures::{
io::{AsyncRead, AsyncWrite},
pin_mut,
task::Poll,
};
#[cfg(feature = "async")]
use futures_test::task::noop_context;
#[test]
fn armored_round_trip() {
const MAX_LEN: usize = ARMORED_BYTES_PER_LINE * 50;
let mut data = Vec::with_capacity(MAX_LEN);
for i in 0..MAX_LEN {
data.push(i as u8);
let mut encoded = vec![];
{
let mut out = ArmoredWriter::wrap_output(&mut encoded, Format::AsciiArmor).unwrap();
out.write_all(&data).unwrap();
out.finish().unwrap();
}
let mut buf = vec![];
{
let mut input = ArmoredReader::new(&encoded[..]);
input.read_to_end(&mut buf).unwrap();
}
assert_eq!(buf, data);
}
}
#[cfg(feature = "async")]
#[test]
fn armored_async_round_trip() {
const MAX_LEN: usize = ARMORED_BYTES_PER_LINE * 50;
let mut data = Vec::with_capacity(MAX_LEN);
for i in 0..MAX_LEN {
data.push(i as u8);
let mut encoded = vec![];
{
let w = ArmoredWriter::wrap_async_output(&mut encoded, Format::AsciiArmor);
pin_mut!(w);
let mut cx = noop_context();
let mut tmp = &data[..];
loop {
match w.as_mut().poll_write(&mut cx, tmp) {
Poll::Ready(Ok(0)) => break,
Poll::Ready(Ok(written)) => tmp = &tmp[written..],
Poll::Ready(Err(e)) => panic!("Unexpected error: {}", e),
Poll::Pending => panic!("Unexpected Pending"),
}
}
loop {
match w.as_mut().poll_close(&mut cx) {
Poll::Ready(Ok(())) => break,
Poll::Ready(Err(e)) => panic!("Unexpected error: {}", e),
Poll::Pending => panic!("Unexpected Pending"),
}
}
}
let mut buf = vec![];
{
let input = ArmoredReader::from_async_reader(&encoded[..]);
pin_mut!(input);
let mut cx = noop_context();
let mut tmp = [0; 4096];
loop {
match input.as_mut().poll_read(&mut cx, &mut tmp) {
Poll::Ready(Ok(0)) => break,
Poll::Ready(Ok(read)) => buf.extend_from_slice(&tmp[..read]),
Poll::Ready(Err(e)) => panic!("Unexpected error: {}", e),
Poll::Pending => panic!("Unexpected Pending"),
}
}
}
assert_eq!(buf, data);
}
}
#[test]
fn binary_seeking() {
let mut data = vec![0; 100 * 100];
for (i, b) in data.iter_mut().enumerate() {
*b = i as u8;
}
let mut written = vec![];
{
let mut w = ArmoredWriter::wrap_output(&mut written, Format::Binary).unwrap();
w.write_all(&data).unwrap();
w.finish().unwrap();
};
assert_eq!(written, data);
let mut r = ArmoredReader::new(Cursor::new(written));
// Read part-way into the first "line"
let mut buf = vec![0; 100];
r.read_exact(&mut buf[..5]).unwrap();
assert_eq!(&buf[..5], &data[..5]);
// Seek back to the beginning
r.seek(SeekFrom::Start(0)).unwrap();
// Read into the middle of the data
for i in 0..70 {
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[100 * i..100 * (i + 1)]);
}
// Seek back into the first line
r.seek(SeekFrom::Start(5)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[5..105]);
// Seek forwards from the current position
r.seek(SeekFrom::Current(500)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[605..705]);
// Seek backwards from the end
r.seek(SeekFrom::End(-1337)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[data.len() - 1337..data.len() - 1237]);
}
#[test]
fn armored_seeking() {
let mut data = vec![0; 100 * 100];
for (i, b) in data.iter_mut().enumerate() {
*b = i as u8;
}
let mut armored = vec![];
{
let mut w = ArmoredWriter::wrap_output(&mut armored, Format::AsciiArmor).unwrap();
w.write_all(&data).unwrap();
w.finish().unwrap();
};
let mut r = ArmoredReader::new(Cursor::new(armored));
// Read part-way into the first "line"
let mut buf = vec![0; 100];
r.read_exact(&mut buf[..5]).unwrap();
assert_eq!(&buf[..5], &data[..5]);
// Seek back to the beginning
r.seek(SeekFrom::Start(0)).unwrap();
// Read into the middle of the data
for i in 0..70 {
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[100 * i..100 * (i + 1)]);
}
// Seek back into the first line
r.seek(SeekFrom::Start(5)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[5..105]);
// Seek forwards from the current position
r.seek(SeekFrom::Current(500)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[605..705]);
// Seek backwards from the end
r.seek(SeekFrom::End(-1337)).unwrap();
r.read_exact(&mut buf).unwrap();
assert_eq!(&buf[..], &data[data.len() - 1337..data.len() - 1237]);
}
}