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use crate::{error::Error, serialization::*, yubikey::YubiKey};
use crate::{CB_OBJ_MAX, CB_OBJ_TAG_MAX};
use log::error;
const OBJ_MSROOTS1: u32 = 0x005f_ff11;
#[allow(dead_code)]
const OBJ_MSROOTS2: u32 = 0x005f_ff12;
#[allow(dead_code)]
const OBJ_MSROOTS3: u32 = 0x005f_ff13;
#[allow(dead_code)]
const OBJ_MSROOTS4: u32 = 0x005f_ff14;
const OBJ_MSROOTS5: u32 = 0x005f_ff15;
const TAG_MSROOTS_END: u8 = 0x82;
const TAG_MSROOTS_MID: u8 = 0x83;
pub struct MsRoots(Vec<u8>);
impl MsRoots {
pub fn new(msroots: impl AsRef<[u8]>) -> Result<Self, Error> {
Ok(MsRoots(msroots.as_ref().into()))
}
pub fn read(yubikey: &mut YubiKey) -> Result<Option<Self>, Error> {
let txn = yubikey.begin_transaction()?;
let mut data = Vec::with_capacity(CB_OBJ_MAX);
for object_id in OBJ_MSROOTS1..OBJ_MSROOTS5 {
let buf = txn.fetch_object(object_id)?;
let (_, tlv) = match Tlv::parse(&buf) {
Ok(res) => res,
Err(_) => return Ok(None),
};
if (TAG_MSROOTS_MID != tlv.tag || OBJ_MSROOTS5 == object_id)
&& (TAG_MSROOTS_END != tlv.tag)
{
return Ok(None);
}
data.extend_from_slice(tlv.value);
if tlv.tag == TAG_MSROOTS_END {
break;
}
}
MsRoots::new(&data).map(Some).map_err(|e| {
error!("error parsing msroots: {:?}", e);
e
})
}
pub fn write(&self, yubikey: &mut YubiKey) -> Result<(), Error> {
let mut buf = [0u8; CB_OBJ_MAX];
let mut offset: usize;
let mut data_offset: usize = 0;
let mut data_chunk: usize;
let data = &self.0;
let data_len = data.len();
let n_objs: usize;
let txn = yubikey.begin_transaction()?;
if data_len == 0 {
return txn.save_object(OBJ_MSROOTS1, &[]);
}
n_objs = (data_len / (CB_OBJ_MAX - CB_OBJ_TAG_MAX)) + 1;
if n_objs > 5 {
return Err(Error::SizeError);
}
for i in 0..n_objs {
offset = 0;
data_chunk = if CB_OBJ_MAX - CB_OBJ_TAG_MAX < data_len - data_offset {
CB_OBJ_MAX - CB_OBJ_TAG_MAX
} else {
data_len - data_offset
};
offset += Tlv::write(
&mut buf,
if i == n_objs - 1 {
TAG_MSROOTS_END
} else {
TAG_MSROOTS_MID
},
&data[data_offset..(data_offset + data_chunk)],
)?;
txn.save_object(OBJ_MSROOTS1 + i as u32, &buf[..offset])?;
data_offset += data_chunk;
}
Ok(())
}
}
impl AsRef<[u8]> for MsRoots {
fn as_ref(&self) -> &[u8] {
self.0.as_ref()
}
}