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use crate::constants::tags::StructureTag;
use crate::tss2_esys::{TPM2B_DIGEST, TPMT_TK_HASHCHECK, TPMT_TK_VERIFIED};
use crate::utils::Hierarchy;
use crate::{Error, Result, WrapperErrorKind};
use log::error;
use std::convert::{TryFrom, TryInto};
const TPM2B_DIGEST_BUFFER_SIZE: usize = 64;
macro_rules! impl_ticket_try_froms {
($ticket_type:ident, $tss_ticket_type:ident) => {
impl TryFrom<$ticket_type> for $tss_ticket_type {
type Error = Error;
fn try_from(ticket: $ticket_type) -> Result<Self> {
let digest = ticket.digest;
if digest.len() > TPM2B_DIGEST_BUFFER_SIZE {
return Err(Error::local_error(WrapperErrorKind::WrongParamSize));
}
let mut buffer = [0; TPM2B_DIGEST_BUFFER_SIZE];
buffer[..digest.len()].clone_from_slice(&digest[..digest.len()]);
Ok($tss_ticket_type {
tag: <$ticket_type>::TAG.into(),
hierarchy: ticket.hierarchy.rh(),
digest: TPM2B_DIGEST {
size: digest.len().try_into().unwrap(),
buffer,
},
})
}
}
impl TryFrom<$tss_ticket_type> for $ticket_type {
type Error = Error;
fn try_from(tss_ticket: $tss_ticket_type) -> Result<Self> {
match StructureTag::try_from(tss_ticket.tag) {
Ok(val) => {
if val != <$ticket_type>::TAG {
return Err(Error::local_error(WrapperErrorKind::InconsistentParams));
}
}
Err(why) => {
error!("Failed to parsed tag: {}", why);
return Err(Error::local_error(WrapperErrorKind::InvalidParam));
}
};
let len = tss_ticket.digest.size.into();
if len > TPM2B_DIGEST_BUFFER_SIZE {
error!(
"Error: Invalid digest size.(Digest size: {0} > Digest buffer size: {1})",
len, TPM2B_DIGEST_BUFFER_SIZE,
);
return Err(Error::local_error(WrapperErrorKind::InvalidParam));
}
let mut digest = tss_ticket.digest.buffer.to_vec();
digest.truncate(len);
let hierarchy = tss_ticket.hierarchy.try_into()?;
Ok($ticket_type { hierarchy, digest })
}
}
};
}
pub trait Ticket {
const TAG: StructureTag;
fn hierarchy(&self) -> Hierarchy;
fn digest(&self) -> &[u8];
}
#[derive(Debug, Clone)]
pub struct HashcheckTicket {
hierarchy: Hierarchy,
digest: Vec<u8>,
}
impl Ticket for HashcheckTicket {
const TAG: StructureTag = StructureTag::Hashcheck;
fn hierarchy(&self) -> Hierarchy {
self.hierarchy
}
fn digest(&self) -> &[u8] {
&self.digest
}
}
impl_ticket_try_froms!(HashcheckTicket, TPMT_TK_HASHCHECK);
#[derive(Debug)]
pub struct VerifiedTicket {
hierarchy: Hierarchy,
digest: Vec<u8>,
}
impl Ticket for VerifiedTicket {
const TAG: StructureTag = StructureTag::Verified;
fn hierarchy(&self) -> Hierarchy {
self.hierarchy
}
fn digest(&self) -> &[u8] {
&self.digest
}
}
impl_ticket_try_froms!(VerifiedTicket, TPMT_TK_VERIFIED);