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merge: pull request #22 from namib-project/rustcrypto_backend
Add a RustCrypto based backend for cryptographic COSE operations
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| * Copyright (c) 2024 The NAMIB Project Developers. | ||
| * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | ||
| * option. This file may not be copied, modified, or distributed | ||
| * except according to those terms. | ||
| * | ||
| * SPDX-License-Identifier: MIT OR Apache-2.0 | ||
| */ | ||
| use cfg_aliases::cfg_aliases; | ||
|
|
||
| fn main() { | ||
| // Set up some aliases for conditional compilation (in order to avoid repetition). | ||
| cfg_aliases! { | ||
| rustcrypto_encrypt_base: { | ||
| any( | ||
| feature = "rustcrypto-aes-gcm" | ||
| ) | ||
| }, | ||
| rustcrypto_sign_base: { | ||
| any( | ||
| feature = "rustcrypto-ecdsa" | ||
| ) | ||
| }, | ||
| rustcrypto_key_distribution_base: { | ||
| any( | ||
| feature = "rustcrypto-aes-kw" | ||
| ) | ||
| }, | ||
| rustcrypto_mac_base: { | ||
| any( | ||
| feature = "rustcrypto-hmac" | ||
| ) | ||
| }, | ||
| rustcrypto_base: { | ||
| any( | ||
| rustcrypto_encrypt_base, | ||
| rustcrypto_sign_base, | ||
| rustcrypto_key_distribution_base, | ||
| rustcrypto_mac_base | ||
| ) | ||
| }, | ||
| } | ||
| } |
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110 changes: 110 additions & 0 deletions
110
src/token/cose/crypto_impl/rustcrypto/encrypt/aes_gcm.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| * Copyright (c) 2024 The NAMIB Project Developers. | ||
| * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | ||
| * option. This file may not be copied, modified, or distributed | ||
| * except according to those terms. | ||
| * | ||
| * SPDX-License-Identifier: MIT OR Apache-2.0 | ||
| */ | ||
| use aead::{Aead, AeadCore, Key, KeyInit, Nonce, Payload}; | ||
| use aes::Aes192; | ||
| use aes_gcm::{Aes128Gcm, Aes256Gcm, AesGcm}; | ||
| use coset::{iana, Algorithm}; | ||
| use rand::CryptoRng; | ||
| use rand::RngCore; | ||
| use typenum::consts::U12; | ||
|
|
||
| use crate::error::CoseCipherError; | ||
| use crate::token::cose::{CoseSymmetricKey, CryptoBackend}; | ||
|
|
||
| use super::RustCryptoContext; | ||
|
|
||
| impl<RNG: RngCore + CryptoRng> RustCryptoContext<RNG> { | ||
| /// Perform an AEAD encryption operation on `plaintext` and the additional authenticated | ||
| /// data `aad` using the given `iv` and `key`. | ||
| fn encrypt_aead<AEAD: Aead + AeadCore + KeyInit>( | ||
| key: &CoseSymmetricKey<'_, <RustCryptoContext<RNG> as CryptoBackend>::Error>, | ||
| plaintext: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<<Self as CryptoBackend>::Error>> { | ||
| let aes_key = Key::<AEAD>::from_slice(key.k); | ||
| let cipher = AEAD::new(aes_key); | ||
| let nonce = Nonce::<AEAD>::from_slice(iv); | ||
| let payload = Payload { | ||
| msg: plaintext, | ||
| aad, | ||
| }; | ||
| cipher | ||
| .encrypt(nonce, payload) | ||
| .map_err(CoseCipherError::from) | ||
| } | ||
|
|
||
| /// Perform an AEAD decryption operation on `ciphertext` and the additional authenticated | ||
| /// data `aad` using the given `iv` and `key`. | ||
| fn decrypt_aead<AEAD: Aead + AeadCore + KeyInit>( | ||
| key: &CoseSymmetricKey<'_, <RustCryptoContext<RNG> as CryptoBackend>::Error>, | ||
| ciphertext: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<<Self as CryptoBackend>::Error>> { | ||
| let aes_key = Key::<AEAD>::from_slice(key.k); | ||
| let cipher = AEAD::new(aes_key); | ||
| let nonce = Nonce::<AEAD>::from_slice(iv); | ||
| let payload = Payload { | ||
| msg: ciphertext, | ||
| aad, | ||
| }; | ||
| cipher | ||
| .decrypt(nonce, payload) | ||
| .map_err(CoseCipherError::from) | ||
| } | ||
|
|
||
| /// Perform an AES-GCM encryption operation on `plaintext` and the additional authenticated | ||
| /// data `aad` using the given `iv` and `key` with the given `algorithm` variant of AES-GCM. | ||
| pub(super) fn encrypt_aes_gcm( | ||
| algorithm: iana::Algorithm, | ||
| key: &CoseSymmetricKey<'_, <Self as CryptoBackend>::Error>, | ||
| plaintext: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<<Self as CryptoBackend>::Error>> { | ||
| match algorithm { | ||
| iana::Algorithm::A128GCM => Self::encrypt_aead::<Aes128Gcm>(key, plaintext, aad, iv), | ||
| iana::Algorithm::A192GCM => { | ||
| Self::encrypt_aead::<AesGcm<Aes192, U12>>(key, plaintext, aad, iv) | ||
| } | ||
| iana::Algorithm::A256GCM => Self::encrypt_aead::<Aes256Gcm>(key, plaintext, aad, iv), | ||
| a => Err(CoseCipherError::UnsupportedAlgorithm(Algorithm::Assigned( | ||
| a, | ||
| ))), | ||
| } | ||
| } | ||
|
|
||
| /// Perform an AES-GCM decryption operation on `ciphertext` and the additional authenticated | ||
| /// data `aad` using the given `iv` and `key` with the given `algorithm` variant of AES-GCM. | ||
| pub(super) fn decrypt_aes_gcm( | ||
| algorithm: iana::Algorithm, | ||
| key: &CoseSymmetricKey<'_, <Self as CryptoBackend>::Error>, | ||
| ciphertext_with_tag: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<<Self as CryptoBackend>::Error>> { | ||
| match algorithm { | ||
| iana::Algorithm::A128GCM => { | ||
| Self::decrypt_aead::<Aes128Gcm>(key, ciphertext_with_tag, aad, iv) | ||
| } | ||
| iana::Algorithm::A192GCM => { | ||
| Self::decrypt_aead::<AesGcm<Aes192, U12>>(key, ciphertext_with_tag, aad, iv) | ||
| } | ||
| iana::Algorithm::A256GCM => { | ||
| Self::decrypt_aead::<Aes256Gcm>(key, ciphertext_with_tag, aad, iv) | ||
| } | ||
| a => Err(CoseCipherError::UnsupportedAlgorithm(Algorithm::Assigned( | ||
| a, | ||
| ))), | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| * Copyright (c) 2024 The NAMIB Project Developers. | ||
| * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your | ||
| * option. This file may not be copied, modified, or distributed | ||
| * except according to those terms. | ||
| * | ||
| * SPDX-License-Identifier: MIT OR Apache-2.0 | ||
| */ | ||
| use coset::iana; | ||
| use rand::{CryptoRng, RngCore}; | ||
|
|
||
| use crate::error::CoseCipherError; | ||
| use crate::token::cose::crypto_impl::rustcrypto::RustCryptoContext; | ||
| use crate::token::cose::{CoseSymmetricKey, EncryptCryptoBackend}; | ||
|
|
||
| #[cfg(feature = "rustcrypto-aes-gcm")] | ||
| mod aes_gcm; | ||
|
|
||
| impl<RNG: RngCore + CryptoRng> EncryptCryptoBackend for RustCryptoContext<RNG> { | ||
| #[cfg(feature = "rustcrypto-aes-gcm")] | ||
| fn encrypt_aes_gcm( | ||
| &mut self, | ||
| algorithm: iana::Algorithm, | ||
| key: CoseSymmetricKey<'_, Self::Error>, | ||
| plaintext: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<Self::Error>> { | ||
| Self::encrypt_aes_gcm(algorithm, &key, plaintext, aad, iv) | ||
| } | ||
|
|
||
| #[cfg(feature = "rustcrypto-aes-gcm")] | ||
| fn decrypt_aes_gcm( | ||
| &mut self, | ||
| algorithm: iana::Algorithm, | ||
| key: CoseSymmetricKey<'_, Self::Error>, | ||
| ciphertext_with_tag: &[u8], | ||
| aad: &[u8], | ||
| iv: &[u8], | ||
| ) -> Result<Vec<u8>, CoseCipherError<Self::Error>> { | ||
| Self::decrypt_aes_gcm(algorithm, &key, ciphertext_with_tag, aad, iv) | ||
| } | ||
| } |
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