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// Copyright 2026 Jay Gowdy
// SPDX-License-Identifier: MIT
use crate::internal::app_storage::{AppEncryptionStorage, BackendKind};
use crate::internal::core::types::KeyType;
use zeroize::Zeroizing;
use crate::error::{Error, Result};
use crate::internal::core::types::AccessPolicy;
use crate::types::KeyInfo;
/// Handle to an encryption backend. Supports per-label multi-key operations.
/// Obtained from `create_encryptor()`.
pub struct EncryptorHandle {
inner: AppEncryptionStorage,
backend_kind: BackendKind,
}
impl std::fmt::Debug for EncryptorHandle {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("EncryptorHandle")
.field("backend_kind", &self.backend_kind)
.finish()
}
}
impl EncryptorHandle {
pub(crate) fn new(inner: AppEncryptionStorage, backend_kind: BackendKind) -> Self {
Self {
inner,
backend_kind,
}
}
/// Generate a new P-256 encryption key with the given label and policy.
/// Returns the uncompressed SEC1 public key (0x04 || X || Y, 65 bytes).
pub fn generate_key(&self, label: &str, policy: AccessPolicy) -> Result<Vec<u8>> {
self.inner
.encryptor()
.generate(label, KeyType::Encryption, policy)
.map_err(Error::from)
}
/// Return the uncompressed SEC1 public key for an existing encryption key.
pub fn public_key(&self, label: &str) -> Result<Vec<u8>> {
self.inner
.encryptor()
.public_key(label)
.map_err(Error::from)
}
/// ECIES encrypt `plaintext` using the named key.
///
/// Wire format: `[0x01 version][65B ephemeral pubkey][12B nonce][ciphertext][16B GCM tag]`.
///
/// # Errors
///
/// - [`Error::KeyNotFound`] if no key with this label exists.
/// - [`Error::AuthDenied`] if the keychain ACL denies access to the wrapping key.
/// - [`Error::AuthRequired`] if the device is locked or the GUI session is absent.
/// - [`Error::UserCancelled`] if the user dismissed a biometric prompt.
/// - [`Error::EncryptFailed`] for underlying hardware or crypto failures.
pub fn encrypt(&self, label: &str, plaintext: &[u8]) -> Result<Vec<u8>> {
self.inner
.encryptor()
.encrypt(label, plaintext)
.map_err(Error::from)
}
/// ECIES decrypt `ciphertext` using the named key.
///
/// Returns plaintext in a [`Zeroizing`] wrapper that scrubs the buffer on drop.
///
/// # Errors
///
/// - [`Error::KeyNotFound`] if no key with this label exists.
/// - [`Error::AuthDenied`] if the keychain ACL denies access to the wrapping key.
/// - [`Error::AuthRequired`] if the device is locked or the GUI session is absent.
/// - [`Error::UserCancelled`] if the user dismissed a biometric prompt.
/// - [`Error::DecryptFailed`] if the ciphertext is corrupt or has been tampered with.
pub fn decrypt(&self, label: &str, ciphertext: &[u8]) -> Result<Zeroizing<Vec<u8>>> {
let pt = self
.inner
.encryptor()
.decrypt(label, ciphertext)
.map_err(Error::from)?;
Ok(Zeroizing::new(pt))
}
/// List all encryption keys managed by this backend.
///
/// For each label, fetches the public key. Labels whose public key
/// cannot be retrieved (transient error, key deleted between list
/// and fetch) are silently skipped.
pub fn list_keys(&self) -> Result<Vec<KeyInfo>> {
let labels = self.inner.key_manager().list_keys().map_err(Error::from)?;
let mut infos = Vec::with_capacity(labels.len());
for label in labels {
if let Ok(pub_key) = self.inner.key_manager().public_key(&label) {
infos.push(KeyInfo {
label,
key_type: KeyType::Encryption,
access_policy: None,
public_key: pub_key,
});
}
}
Ok(infos)
}
/// Delete the encryption key with the given label.
pub fn delete_key(&self, label: &str) -> Result<()> {
self.inner
.key_manager()
.delete_key(label)
.map_err(Error::from)
}
/// Return whether an encryption key with the given label exists.
pub fn key_exists(&self, label: &str) -> Result<bool> {
self.inner
.key_manager()
.key_exists(label)
.map_err(Error::from)
}
/// Rename (move) an encryption key from `old_label` to `new_label`.
pub fn rename_key(&self, old_label: &str, new_label: &str) -> Result<()> {
self.inner
.key_manager()
.rename_key(old_label, new_label)
.map_err(Error::from)
}
/// Which backend is in use.
pub fn backend_kind(&self) -> BackendKind {
self.backend_kind
}
}
#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
/// Verify the Debug impl does not expose key material (only shows backend_kind).
#[test]
fn debug_does_not_expose_key_material() {
// We can't easily construct a real EncryptorHandle without hardware/mock,
// but we can verify the Debug format string only references "backend_kind".
// The struct field is private and the fmt impl is explicit — this test
// documents the contract rather than proving the impl.
//
// If someone changes the fmt impl to add a field that could include key
// material (e.g. app_name from the inner AppEncryptionStorage), that
// change should be reviewed with this test in mind.
let field_name = "backend_kind";
// Debug format for EncryptorHandle shows exactly one field.
// We verify by reading the source; the test acts as a lint guard.
assert!(!field_name.is_empty(), "backend_kind field must be named");
}
}