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#[cfg(test)]
mod handshake_message_server_key_exchange_test;
use super::*;
use crate::curve::named_curve::*;
use crate::curve::*;
use crate::signature_hash_algorithm::*;
use byteorder::{BigEndian, WriteBytesExt};
use std::io::{Read, Write};
#[derive(Clone, Debug, PartialEq)]
pub struct HandshakeMessageServerKeyExchange {
pub(crate) identity_hint: Vec<u8>,
pub(crate) elliptic_curve_type: EllipticCurveType,
pub(crate) named_curve: NamedCurve,
pub(crate) public_key: Vec<u8>,
pub(crate) hash_algorithm: HashAlgorithm,
pub(crate) signature_algorithm: SignatureAlgorithm,
pub(crate) signature: Vec<u8>,
}
impl HandshakeMessageServerKeyExchange {
pub fn handshake_type(&self) -> HandshakeType {
HandshakeType::ServerKeyExchange
}
pub fn size(&self) -> usize {
if !self.identity_hint.is_empty() {
2 + self.identity_hint.len()
} else {
1 + 2 + 1 + self.public_key.len() + 2 + 2 + self.signature.len()
}
}
pub fn marshal<W: Write>(&self, writer: &mut W) -> Result<()> {
if !self.identity_hint.is_empty() {
writer.write_u16::<BigEndian>(self.identity_hint.len() as u16)?;
writer.write_all(&self.identity_hint)?;
return Ok(writer.flush()?);
}
writer.write_u8(self.elliptic_curve_type as u8)?;
writer.write_u16::<BigEndian>(self.named_curve as u16)?;
writer.write_u8(self.public_key.len() as u8)?;
writer.write_all(&self.public_key)?;
writer.write_u8(self.hash_algorithm as u8)?;
writer.write_u8(self.signature_algorithm as u8)?;
writer.write_u16::<BigEndian>(self.signature.len() as u16)?;
writer.write_all(&self.signature)?;
Ok(writer.flush()?)
}
pub fn unmarshal<R: Read>(reader: &mut R) -> Result<Self> {
let mut data = vec![];
reader.read_to_end(&mut data)?;
let psk_length = ((data[0] as u16) << 8) | data[1] as u16;
if data.len() == psk_length as usize + 2 {
return Ok(HandshakeMessageServerKeyExchange {
identity_hint: data[2..].to_vec(),
elliptic_curve_type: EllipticCurveType::Unsupported,
named_curve: NamedCurve::Unsupported,
public_key: vec![],
hash_algorithm: HashAlgorithm::Unsupported,
signature_algorithm: SignatureAlgorithm::Unsupported,
signature: vec![],
});
}
let elliptic_curve_type = data[0].into();
if data[1..].len() < 2 {
return Err(Error::ErrBufferTooSmall);
}
let named_curve = (((data[1] as u16) << 8) | data[2] as u16).into();
if data.len() < 4 {
return Err(Error::ErrBufferTooSmall);
}
let public_key_length = data[3] as usize;
let mut offset = 4 + public_key_length;
if data.len() < offset {
return Err(Error::ErrBufferTooSmall);
}
let public_key = data[4..offset].to_vec();
if data.len() <= offset {
return Err(Error::ErrBufferTooSmall);
}
let hash_algorithm = data[offset].into();
offset += 1;
if data.len() <= offset {
return Err(Error::ErrBufferTooSmall);
}
let signature_algorithm = data[offset].into();
offset += 1;
if data.len() < offset + 2 {
return Err(Error::ErrBufferTooSmall);
}
let signature_length = (((data[offset] as u16) << 8) | data[offset + 1] as u16) as usize;
offset += 2;
if data.len() < offset + signature_length {
return Err(Error::ErrBufferTooSmall);
}
let signature = data[offset..offset + signature_length].to_vec();
Ok(HandshakeMessageServerKeyExchange {
identity_hint: vec![],
elliptic_curve_type,
named_curve,
public_key,
hash_algorithm,
signature_algorithm,
signature,
})
}
}
