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use crate::api::*;
// use crate::config::*;
use crate::error::Error;
use crate::service::*;
use crate::types::*;
#[cfg(feature = "aes256-cbc")]
impl Encrypt for super::Aes256Cbc
{
/// Encrypts the input *with zero IV*
fn encrypt(keystore: &mut impl Keystore, request: &request::Encrypt)
-> Result<reply::Encrypt, Error>
{
use block_modes::{BlockMode, Cbc};
// use block_modes::Cbc;
use block_modes::block_padding::ZeroPadding;
use aes::Aes256;
// TODO: perhaps use NoPadding and have client pad, to emphasize spec-conformance?
type Aes256Cbc = Cbc<Aes256, ZeroPadding>;
let key_id = request.key;
// let mut symmetric_key = [0u8; 32];
// let path = keystore.key_path(key::Secrecy::Secret, &key_id);
// keystore.load_key(&path, key::Kind::SymmetricKey32, &mut symmetric_key)?;
let symmetric_key: [u8; 32] = keystore
.load_key(key::Secrecy::Secret, None, &key_id)?
.material.as_slice().try_into()
.map_err(|_| Error::InternalError)?;
let zero_iv = [0u8; 16];
let cipher = Aes256Cbc::new_from_slices(&symmetric_key, &zero_iv).unwrap();
// buffer must have enough space for message+padding
let mut buffer = request.message.clone();
// // copy message to the buffer
// let pos = plaintext.len();
// buffer[..pos].copy_from_slice(plaintext);
let l = buffer.len();
// hprintln!(" aes256cbc encrypting l = {}B: {:?}", l, &buffer).ok();
// Encrypt message in-place.
// &buffer[..pos] is used as a message and &buffer[pos..] as a reserved space for padding.
// The padding space should be big enough for padding, otherwise method will return Err(BlockModeError).
let ciphertext = cipher.encrypt(&mut buffer, l).unwrap();
let ciphertext = Message::from_slice(&ciphertext).unwrap();
Ok(reply::Encrypt { ciphertext, nonce: ShortData::new(), tag: ShortData::new() })
}
}
#[cfg(feature = "aes256-cbc")]
impl WrapKey for super::Aes256Cbc
{
fn wrap_key(keystore: &mut impl Keystore, request: &request::WrapKey)
-> Result<reply::WrapKey, Error>
{
// TODO: need to check both secret and private keys
// let path = keystore.key_path(key::Secrecy::Secret, &request.key)?;
// let (serialized_key, _location) = keystore.load_key_unchecked(&path)?;
// let message: Message = serialized_key.material.try_to_byte_buf().map_err(|_| Error::InternalError)?;
let message = Message::from_slice(keystore
.load_key(key::Secrecy::Secret, None, &request.key)?
.material.as_slice()).map_err(|_| Error::InternalError)?;
let encryption_request = request::Encrypt {
mechanism: Mechanism::Aes256Cbc,
key: request.wrapping_key,
message,
associated_data: ShortData::new(),
nonce: None,
};
let encryption_reply = <super::Aes256Cbc>::encrypt(keystore, &encryption_request)?;
let wrapped_key = encryption_reply.ciphertext;
Ok(reply::WrapKey { wrapped_key })
}
}
#[cfg(feature = "aes256-cbc")]
impl Decrypt for super::Aes256Cbc
{
fn decrypt(keystore: &mut impl Keystore, request: &request::Decrypt)
-> Result<reply::Decrypt, Error>
{
use block_modes::{BlockMode, Cbc};
// use block_modes::Cbc;
use block_modes::block_padding::ZeroPadding;
use aes::Aes256;
// TODO: perhaps use NoPadding and have client pad, to emphasize spec-conformance?
type Aes256Cbc = Cbc<Aes256, ZeroPadding>;
let key_id = request.key;
let symmetric_key: [u8; 32] = keystore
.load_key(key::Secrecy::Secret, None, &key_id)?
.material.as_slice()
.try_into()
.map_err(|_| Error::InternalError)?;
let zero_iv = [0u8; 16];
let cipher = Aes256Cbc::new_from_slices(&symmetric_key, &zero_iv).unwrap();
// buffer must have enough space for message+padding
let mut buffer = request.message.clone();
// // copy message to the buffer
// let pos = plaintext.len();
// buffer[..pos].copy_from_slice(plaintext);
// let l = buffer.len();
// Decrypt message in-place.
// Returns an error if buffer length is not multiple of block size and
// if after decoding message has malformed padding.
// hprintln!("encrypted: {:?}", &buffer).ok();
// hprintln!("symmetric key: {:?}", &symmetric_key).ok();
let plaintext = cipher.decrypt(&mut buffer).unwrap();
// hprintln!("decrypted: {:?}", &plaintext).ok();
let plaintext = Message::from_slice(&plaintext).unwrap();
Ok(reply::Decrypt { plaintext: Some(plaintext) })
}
}
#[cfg(not(feature = "aes256-cbc"))]
impl Decrypt for super::Aes256Cbc {}
#[cfg(not(feature = "aes256-cbc"))]
impl Encrypt for super::Aes256Cbc {}