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use nettle::cipher::{self, Cipher};
use nettle::mode::{self};
use crate::crypto::symmetric::Mode;
use crate::{Error, Result};
use crate::types::SymmetricAlgorithm;
impl<T: nettle::mode::Mode> Mode for T {
fn block_size(&self) -> usize {
self.block_size()
}
fn encrypt(
&mut self,
iv: &mut [u8],
dst: &mut [u8],
src: &[u8],
) -> Result<()> {
self.encrypt(iv, dst, src)
.map_err(Into::into)
}
fn decrypt(
&mut self,
iv: &mut [u8],
dst: &mut [u8],
src: &[u8],
) -> Result<()> {
self.decrypt(iv, dst, src)
.map_err(Into::into)
}
}
impl SymmetricAlgorithm {
/// Length of a key for this algorithm in bytes. Fails if Sequoia
/// does not support this algorithm.
pub fn key_size(self) -> Result<usize> {
match self {
SymmetricAlgorithm::TripleDES => Ok(cipher::Des3::KEY_SIZE),
SymmetricAlgorithm::CAST5 => Ok(cipher::Cast128::KEY_SIZE),
// RFC4880, Section 9.2: Blowfish (128 bit key, 16 rounds)
SymmetricAlgorithm::Blowfish => Ok(16),
SymmetricAlgorithm::AES128 => Ok(cipher::Aes128::KEY_SIZE),
SymmetricAlgorithm::AES192 => Ok(cipher::Aes192::KEY_SIZE),
SymmetricAlgorithm::AES256 => Ok(cipher::Aes256::KEY_SIZE),
SymmetricAlgorithm::Twofish => Ok(cipher::Twofish::KEY_SIZE),
SymmetricAlgorithm::Camellia128 => Ok(cipher::Camellia128::KEY_SIZE),
SymmetricAlgorithm::Camellia192 => Ok(cipher::Camellia192::KEY_SIZE),
SymmetricAlgorithm::Camellia256 => Ok(cipher::Camellia256::KEY_SIZE),
_ => Err(Error::UnsupportedSymmetricAlgorithm(self).into()),
}
}
/// Length of a block for this algorithm in bytes. Fails if
/// Sequoia does not support this algorithm.
pub fn block_size(self) -> Result<usize> {
match self {
SymmetricAlgorithm::TripleDES => Ok(cipher::Des3::BLOCK_SIZE),
SymmetricAlgorithm::CAST5 => Ok(cipher::Cast128::BLOCK_SIZE),
SymmetricAlgorithm::Blowfish => Ok(cipher::Blowfish::BLOCK_SIZE),
SymmetricAlgorithm::AES128 => Ok(cipher::Aes128::BLOCK_SIZE),
SymmetricAlgorithm::AES192 => Ok(cipher::Aes192::BLOCK_SIZE),
SymmetricAlgorithm::AES256 => Ok(cipher::Aes256::BLOCK_SIZE),
SymmetricAlgorithm::Twofish => Ok(cipher::Twofish::BLOCK_SIZE),
SymmetricAlgorithm::Camellia128 => Ok(cipher::Camellia128::BLOCK_SIZE),
SymmetricAlgorithm::Camellia192 => Ok(cipher::Camellia192::BLOCK_SIZE),
SymmetricAlgorithm::Camellia256 => Ok(cipher::Camellia256::BLOCK_SIZE),
_ => Err(Error::UnsupportedSymmetricAlgorithm(self).into()),
}
}
/// Creates a Nettle context for encrypting in CFB mode.
pub(crate) fn make_encrypt_cfb(self, key: &[u8]) -> Result<Box<dyn Mode>> {
match self {
SymmetricAlgorithm::TripleDES =>
Ok(Box::new(
mode::Cfb::<cipher::Des3>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::CAST5 =>
Ok(Box::new(
mode::Cfb::<cipher::Cast128>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::Blowfish =>
Ok(Box::new(
mode::Cfb::<cipher::Blowfish>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::AES128 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes128>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::AES192 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes192>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::AES256 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes256>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::Twofish =>
Ok(Box::new(
mode::Cfb::<cipher::Twofish>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia128 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia128>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia192 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia192>::with_encrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia256 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia256>::with_encrypt_key(&key[..])?)),
_ => Err(Error::UnsupportedSymmetricAlgorithm(self).into()),
}
}
/// Creates a Nettle context for decrypting in CFB mode.
pub(crate) fn make_decrypt_cfb(self, key: &[u8]) -> Result<Box<dyn Mode>> {
match self {
SymmetricAlgorithm::TripleDES =>
Ok(Box::new(
mode::Cfb::<cipher::Des3>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::CAST5 =>
Ok(Box::new(
mode::Cfb::<cipher::Cast128>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::Blowfish =>
Ok(Box::new(
mode::Cfb::<cipher::Blowfish>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::AES128 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes128>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::AES192 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes192>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::AES256 =>
Ok(Box::new(
mode::Cfb::<cipher::Aes256>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::Twofish =>
Ok(Box::new(
mode::Cfb::<cipher::Twofish>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia128 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia128>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia192 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia192>::with_decrypt_key(&key[..])?)),
SymmetricAlgorithm::Camellia256 =>
Ok(Box::new(
mode::Cfb::<cipher::Camellia256>::with_decrypt_key(&key[..])?)),
_ => Err(Error::UnsupportedSymmetricAlgorithm(self).into())
}
}
}
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