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use {
openpgp_card::{
algorithm::{Algo, Curve},
card_do::{
ApplicationIdentifier,
KeyStatus,
},
crypto_data::{EccType, PublicKeyMaterial, Hash},
Error as OpenpgpCardError,
KeyType,
OpenPgp,
StatusBytes,
},
openpgp_card_pcsc::PcscBackend,
serde::{Serialize, Deserialize},
std::cell::RefCell,
thiserror::Error,
};
pub struct OpenpgpCard {
pgp: RefCell<OpenPgp>,
}
impl From<PcscBackend> for OpenpgpCard {
fn from(backend: PcscBackend) -> Self {
let pgp = OpenPgp::new::<PcscBackend>(backend.into());
Self { pgp: RefCell::new(pgp) }
}
}
impl TryFrom<&String> for OpenpgpCard {
type Error = CardErrorWrapper;
fn try_from(ident: &String) -> Result<Self, Self::Error> {
if ident.len() != 32 {
return Err(Self::Error::AIDParseError("OpenPGP AID must be 32-digit hex string".to_string()));
}
let mut ident_bytes = Vec::<u8>::new();
for i in (0..ident.len()).step_by(2) {
ident_bytes.push(u8::from_str_radix(&ident[i..i + 2], 16).map_err(
|_| Self::Error::AIDParseError("non-hex character found in identifier".to_string())
)?);
}
let aid = ApplicationIdentifier::try_from(ident_bytes.as_slice()).map_err(
|e| Self::Error::AIDParseError(e.to_string())
)?;
let backend = PcscBackend::open_by_ident(aid.ident().as_str(), None).map_err(
|_| Self::Error::CardNotFound(ident.to_string())
)?;
Ok(backend.into())
}
}
#[derive(Serialize, Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct OpenpgpCardInfo {
pub manufacturer: String,
pub serial_number: String,
pub aid: String,
pub signing_algo: String,
pub pubkey_bytes: Vec<u8>,
}
impl OpenpgpCard {
pub fn get_info(&self) -> Result<OpenpgpCardInfo, CardErrorWrapper> {
let mut pgp_mut = self.pgp.borrow_mut();
let opt = &mut pgp_mut.transaction()?;
let ard = opt.application_related_data()?;
let aid = ard.application_id()?;
let mut signing_key_exists = false;
if let Some(key_info) = ard.key_information()? {
match key_info.sig_status() {
KeyStatus::Generated | KeyStatus::Imported => signing_key_exists = true,
_ => (),
};
} else {
return Err(CardErrorWrapper::InternalError("could not get key information".to_string()));
}
let mut signing_algo: String = "null".to_string();
let mut pubkey = Vec::<u8>::new();
if signing_key_exists {
signing_algo = ard.algorithm_attributes(KeyType::Signing)?.to_string();
let pk_material = opt.public_key(KeyType::Signing)?;
pubkey = get_pubkey_from_pk_material(pk_material)?;
}
Ok(OpenpgpCardInfo {
manufacturer: aid.manufacturer_name().to_string(),
serial_number: format!("{:08x}", aid.serial()),
aid: aid.to_string().replace(" ", ""),
signing_algo: signing_algo,
pubkey_bytes: pubkey,
})
}
pub fn sign_message(
&self,
message: &[u8],
pin: &[u8],
touch_confirm_callback: fn()
) -> Result<Vec<u8>, CardErrorWrapper> {
let mut pgp_mut = self.pgp.borrow_mut();
let opt = &mut pgp_mut.transaction()?;
let ard = opt.application_related_data()?;
if let Some(key_info) = ard.key_information()? {
match key_info.sig_status() {
KeyStatus::NotPresent | KeyStatus::Unknown(_) => return Err(CardErrorWrapper::SigningKeyNotFound),
_ => (),
};
} else {
return Err(CardErrorWrapper::InternalError("could not get key information".to_string()));
}
opt.verify_pw1_sign(pin).map_err(
|e| match e {
OpenpgpCardError::CardStatus(StatusBytes::IncorrectParametersCommandDataField) => {
CardErrorWrapper::InvalidPin
},
_ => CardErrorWrapper::from(e),
}
)?;
let ard = opt.application_related_data()?;
if let Some(signing_uif) = ard.uif_pso_cds()? {
if signing_uif.touch_policy().touch_required() {
touch_confirm_callback();
}
}
let hash = Hash::EdDSA(message);
let sig = opt.signature_for_hash(hash).map_err(
|e| match e {
OpenpgpCardError::CardStatus(StatusBytes::SecurityRelatedIssues) => {
CardErrorWrapper::TouchConfirmationTimeout
},
_ => CardErrorWrapper::from(e),
}
)?;
Ok(sig)
}
}
#[derive(Serialize, Deserialize, Clone, Debug, Error, PartialEq, Eq)]
pub enum CardErrorWrapper {
#[error("error parsing AID: {0}")]
AIDParseError(String),
#[error("could not find card with AID {0}")]
CardNotFound(String),
#[error("internal OpenPGP error: {0}")]
InternalError(String),
#[error("no signing key found on card")]
SigningKeyNotFound,
#[error("invalid PIN")]
InvalidPin,
#[error("touch confirmation timed out")]
TouchConfirmationTimeout,
}
impl From<OpenpgpCardError> for CardErrorWrapper {
fn from(e: OpenpgpCardError) -> Self {
CardErrorWrapper::InternalError(e.to_string())
}
}
fn get_pubkey_from_pk_material(pk_material: PublicKeyMaterial) -> Result<Vec<u8>, OpenpgpCardError> {
let pk_bytes: [u8; 32] = match pk_material {
PublicKeyMaterial::E(pk) => match pk.algo() {
Algo::Ecc(ecc_attrs) => {
if ecc_attrs.ecc_type() != EccType::EdDSA || ecc_attrs.curve() != Curve::Ed25519 {
return Err(OpenpgpCardError::UnsupportedAlgo(
format!("expected Ed25519 key, got {:?}", ecc_attrs.curve())
));
}
pk.data().try_into().map_err(
|e| OpenpgpCardError::ParseError(format!("key on card is malformed: {}", e))
)?
},
_ => return Err(OpenpgpCardError::UnsupportedAlgo("expected ECC key, got RSA".to_string())),
}
_ => return Err(OpenpgpCardError::UnsupportedAlgo("expected ECC key, got RSA".to_string())),
};
Ok(pk_bytes.to_vec())
}