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use std::{error, fmt, str};
use std::convert::{TryFrom, TryInto};
use std::str::FromStr;
use crate::util::hex;
#[derive(Clone, Copy, Eq, Hash, Ord, PartialOrd)]
pub struct KeyIdentifier([u8; 20]);
impl KeyIdentifier {
pub fn as_slice(&self) -> &[u8] {
self.0.as_ref()
}
pub fn into_hex(self) -> [u8; 40] {
let mut res = [0u8; 40];
hex::encode(self.as_slice(), &mut res);
res
}
}
#[cfg(feature = "bcder")]
impl KeyIdentifier {
pub fn take_from<S: bcder::decode::Source>(
cons: &mut bcder::decode::Constructed<S>
) -> Result<Self, S::Err> {
cons.take_value_if(bcder::Tag::OCTET_STRING, Self::from_content)
}
pub fn take_opt_from<S: bcder::decode::Source>(
cons: &mut bcder::decode::Constructed<S>
) -> Result<Option<Self>, S::Err> {
cons.take_opt_value_if(bcder::Tag::OCTET_STRING, Self::from_content)
}
pub fn from_content<S: bcder::decode::Source>(
content: &mut bcder::decode::Content<S>
) -> Result<Self, S::Err> {
let content = bcder::OctetString::from_content(content)?;
if let Some(slice) = content.as_slice() {
Self::try_from(slice).map_err(|_| bcder::decode::Malformed.into())
}
else if content.len() != 20 {
Err(bcder::decode::Malformed.into())
}
else {
let mut res = KeyIdentifier(Default::default());
let mut pos = 0;
for slice in &content {
let end = pos + slice.len();
res.0[pos .. end].copy_from_slice(slice);
pos = end;
}
Ok(res)
}
}
pub fn skip_opt_in<S: bcder::decode::Source>(
cons: &mut bcder::decode::Constructed<S>
) -> Result<Option<()>, S::Err> {
cons.take_opt_value_if(bcder::Tag::OCTET_STRING, |cons| {
Self::from_content(cons)?;
Ok(())
})
}
}
impl From<[u8; 20]> for KeyIdentifier {
fn from(src: [u8; 20]) -> Self {
KeyIdentifier(src)
}
}
impl From<KeyIdentifier> for [u8; 20] {
fn from(src: KeyIdentifier) -> Self {
src.0
}
}
impl<'a> TryFrom<&'a [u8]> for KeyIdentifier {
type Error = KeyIdentifierSliceError;
fn try_from(value: &'a [u8]) -> Result<Self, Self::Error> {
value.try_into()
.map(KeyIdentifier)
.map_err(|_| KeyIdentifierSliceError)
}
}
impl FromStr for KeyIdentifier {
type Err = ParseKeyIdentifierError;
fn from_str(value: &str) -> Result<Self, Self::Err> {
if value.len() != 40 || !value.is_ascii() {
return Err(ParseKeyIdentifierError)
}
let mut res = KeyIdentifier(Default::default());
for (pos, ch) in value.as_bytes().chunks(2).enumerate() {
let ch = unsafe { str::from_utf8_unchecked(ch) };
res.0[pos] = u8::from_str_radix(ch, 16)
.map_err(|_| ParseKeyIdentifierError)?;
}
Ok(res)
}
}
impl AsRef<[u8]> for KeyIdentifier {
fn as_ref(&self) -> &[u8] {
self.0.as_ref()
}
}
impl<T: AsRef<[u8]>> PartialEq<T> for KeyIdentifier {
fn eq(&self, other: &T) -> bool {
self.0.as_ref().eq(other.as_ref())
}
}
impl fmt::Display for KeyIdentifier {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let mut buf = [0u8; 40];
write!(f, "{}", hex::encode(self.as_slice(), &mut buf))
}
}
impl fmt::Debug for KeyIdentifier {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "KeyIdentifier({})", self)
}
}
#[cfg(feature = "bcder")]
impl bcder::encode::PrimitiveContent for KeyIdentifier {
const TAG: bcder::Tag = bcder::Tag::OCTET_STRING;
fn encoded_len(&self, _mode: bcder::Mode) -> usize {
20
}
fn write_encoded<W: std::io::Write>(
&self,
_mode: bcder::Mode,
target: &mut W
) -> Result<(), std::io::Error> {
target.write_all(&self.0)
}
}
#[cfg(feature = "serde")]
impl serde::Serialize for KeyIdentifier {
fn serialize<S: serde::Serializer>(
&self,
serializer: S
) -> Result<S::Ok, S::Error> {
let mut buf = [0u8; 40];
hex::encode(self.as_slice(), &mut buf).serialize(serializer)
}
}
#[cfg(feature = "serde")]
impl<'de> serde::Deserialize<'de> for KeyIdentifier {
fn deserialize<D: serde::Deserializer<'de>>(
deserializer: D
) -> Result<Self, D::Error> {
struct KeyIdentifierVisitor;
impl<'de> serde::de::Visitor<'de> for KeyIdentifierVisitor {
type Value = KeyIdentifier;
fn expecting(
&self, formatter: &mut fmt::Formatter
) -> fmt::Result {
write!(formatter,
"a string containing a key identifier as hex digits"
)
}
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where E: serde::de::Error {
KeyIdentifier::from_str(s).map_err(serde::de::Error::custom)
}
fn visit_string<E>(self, s: String) -> Result<Self::Value, E>
where E: serde::de::Error {
KeyIdentifier::from_str(&s).map_err(serde::de::Error::custom)
}
}
deserializer.deserialize_str(KeyIdentifierVisitor)
}
}
#[derive(Clone, Debug)]
pub struct ParseKeyIdentifierError;
impl fmt::Display for ParseKeyIdentifierError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("invalid key identifier")
}
}
impl error::Error for ParseKeyIdentifierError { }
#[derive(Clone, Debug)]
pub struct KeyIdentifierSliceError;
impl fmt::Display for KeyIdentifierSliceError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.write_str("invalid slice for key identifier")
}
}
impl error::Error for KeyIdentifierSliceError { }