589 lines
24 KiB
Rust
589 lines
24 KiB
Rust
//! Encryption and Decryption using [OAEP padding](https://datatracker.ietf.org/doc/html/rfc8017#section-7.1).
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//!
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//! # Usage
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//!
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//! See [code example in the toplevel rustdoc](../index.html#oaep-encryption).
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mod decrypting_key;
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mod encrypting_key;
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pub use self::{decrypting_key::DecryptingKey, encrypting_key::EncryptingKey};
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use alloc::boxed::Box;
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use alloc::string::{String, ToString};
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use alloc::vec::Vec;
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use core::fmt;
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use digest::{Digest, DynDigest, FixedOutputReset};
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use num_bigint::BigUint;
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use rand_core::CryptoRngCore;
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use zeroize::Zeroizing;
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use crate::algorithms::oaep::*;
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use crate::algorithms::pad::{uint_to_be_pad, uint_to_zeroizing_be_pad};
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use crate::algorithms::rsa::{rsa_decrypt_and_check, rsa_encrypt};
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use crate::errors::{Error, Result};
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use crate::key::{self, RsaPrivateKey, RsaPublicKey};
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use crate::traits::{PaddingScheme, PublicKeyParts};
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/// Encryption and Decryption using [OAEP padding](https://datatracker.ietf.org/doc/html/rfc8017#section-7.1).
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///
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/// - `digest` is used to hash the label. The maximum possible plaintext length is `m = k - 2 * h_len - 2`,
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/// where `k` is the size of the RSA modulus.
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/// - `mgf_digest` specifies the hash function that is used in the [MGF1](https://datatracker.ietf.org/doc/html/rfc8017#appendix-B.2).
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/// - `label` is optional data that can be associated with the message.
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///
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/// The two hash functions can, but don't need to be the same.
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///
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/// A prominent example is the [`AndroidKeyStore`](https://developer.android.com/guide/topics/security/cryptography#oaep-mgf1-digest).
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/// It uses SHA-1 for `mgf_digest` and a user-chosen SHA flavour for `digest`.
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pub struct Oaep {
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/// Digest type to use.
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pub digest: Box<dyn DynDigest + Send + Sync>,
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/// Digest to use for Mask Generation Function (MGF).
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pub mgf_digest: Box<dyn DynDigest + Send + Sync>,
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/// Optional label.
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pub label: Option<String>,
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}
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impl Oaep {
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/// Create a new OAEP `PaddingScheme`, using `T` as the hash function for both the default (empty) label and for MGF1.
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///
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/// # Example
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/// ```
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/// use sha1::Sha1;
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/// use sha2::Sha256;
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/// use rsa::{BigUint, RsaPublicKey, Oaep, };
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/// use base64ct::{Base64, Encoding};
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///
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/// let n = Base64::decode_vec("ALHgDoZmBQIx+jTmgeeHW6KsPOrj11f6CvWsiRleJlQpW77AwSZhd21ZDmlTKfaIHBSUxRUsuYNh7E2SHx8rkFVCQA2/gXkZ5GK2IUbzSTio9qXA25MWHvVxjMfKSL8ZAxZyKbrG94FLLszFAFOaiLLY8ECs7g+dXOriYtBwLUJK+lppbd+El+8ZA/zH0bk7vbqph5pIoiWggxwdq3mEz4LnrUln7r6dagSQzYErKewY8GADVpXcq5mfHC1xF2DFBub7bFjMVM5fHq7RK+pG5xjNDiYITbhLYrbVv3X0z75OvN0dY49ITWjM7xyvMWJXVJS7sJlgmCCL6RwWgP8PhcE=").unwrap();
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/// let e = Base64::decode_vec("AQAB").unwrap();
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///
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/// let mut rng = rand::thread_rng(); // rand@0.8
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/// let key = RsaPublicKey::new(BigUint::from_bytes_be(&n), BigUint::from_bytes_be(&e)).unwrap();
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/// let padding = Oaep::new::<Sha256>();
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/// let encrypted_data = key.encrypt(&mut rng, padding, b"secret").unwrap();
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/// ```
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pub fn new<T: 'static + Digest + DynDigest + Send + Sync>() -> Self {
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Self {
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digest: Box::new(T::new()),
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mgf_digest: Box::new(T::new()),
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label: None,
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}
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}
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/// Create a new OAEP `PaddingScheme` with an associated `label`, using `T` as the hash function for both the label and for MGF1.
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pub fn new_with_label<T: 'static + Digest + DynDigest + Send + Sync, S: AsRef<str>>(
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label: S,
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) -> Self {
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Self {
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digest: Box::new(T::new()),
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mgf_digest: Box::new(T::new()),
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label: Some(label.as_ref().to_string()),
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}
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}
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/// Create a new OAEP `PaddingScheme`, using `T` as the hash function for the default (empty) label, and `U` as the hash function for MGF1.
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/// If a label is needed use `PaddingScheme::new_oaep_with_label` or `PaddingScheme::new_oaep_with_mgf_hash_with_label`.
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///
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/// # Example
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/// ```
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/// use sha1::Sha1;
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/// use sha2::Sha256;
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/// use rsa::{BigUint, RsaPublicKey, Oaep, };
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/// use base64ct::{Base64, Encoding};
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///
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/// let n = Base64::decode_vec("ALHgDoZmBQIx+jTmgeeHW6KsPOrj11f6CvWsiRleJlQpW77AwSZhd21ZDmlTKfaIHBSUxRUsuYNh7E2SHx8rkFVCQA2/gXkZ5GK2IUbzSTio9qXA25MWHvVxjMfKSL8ZAxZyKbrG94FLLszFAFOaiLLY8ECs7g+dXOriYtBwLUJK+lppbd+El+8ZA/zH0bk7vbqph5pIoiWggxwdq3mEz4LnrUln7r6dagSQzYErKewY8GADVpXcq5mfHC1xF2DFBub7bFjMVM5fHq7RK+pG5xjNDiYITbhLYrbVv3X0z75OvN0dY49ITWjM7xyvMWJXVJS7sJlgmCCL6RwWgP8PhcE=").unwrap();
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/// let e = Base64::decode_vec("AQAB").unwrap();
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///
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/// let mut rng = rand::thread_rng(); // rand@0.8
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/// let key = RsaPublicKey::new(BigUint::from_bytes_be(&n), BigUint::from_bytes_be(&e)).unwrap();
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/// let padding = Oaep::new_with_mgf_hash::<Sha256, Sha1>();
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/// let encrypted_data = key.encrypt(&mut rng, padding, b"secret").unwrap();
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/// ```
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pub fn new_with_mgf_hash<
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T: 'static + Digest + DynDigest + Send + Sync,
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U: 'static + Digest + DynDigest + Send + Sync,
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>() -> Self {
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Self {
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digest: Box::new(T::new()),
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mgf_digest: Box::new(U::new()),
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label: None,
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}
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}
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/// Create a new OAEP `PaddingScheme` with an associated `label`, using `T` as the hash function for the label, and `U` as the hash function for MGF1.
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pub fn new_with_mgf_hash_and_label<
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T: 'static + Digest + DynDigest + Send + Sync,
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U: 'static + Digest + DynDigest + Send + Sync,
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S: AsRef<str>,
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>(
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label: S,
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) -> Self {
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Self {
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digest: Box::new(T::new()),
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mgf_digest: Box::new(U::new()),
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label: Some(label.as_ref().to_string()),
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}
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}
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}
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impl PaddingScheme for Oaep {
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fn decrypt<Rng: CryptoRngCore>(
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mut self,
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rng: Option<&mut Rng>,
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priv_key: &RsaPrivateKey,
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ciphertext: &[u8],
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) -> Result<Vec<u8>> {
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decrypt(
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rng,
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priv_key,
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ciphertext,
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&mut *self.digest,
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&mut *self.mgf_digest,
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self.label,
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)
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}
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fn encrypt<Rng: CryptoRngCore>(
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mut self,
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rng: &mut Rng,
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pub_key: &RsaPublicKey,
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msg: &[u8],
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) -> Result<Vec<u8>> {
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encrypt(
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rng,
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pub_key,
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msg,
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&mut *self.digest,
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&mut *self.mgf_digest,
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self.label,
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)
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}
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}
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impl fmt::Debug for Oaep {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("OAEP")
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.field("digest", &"...")
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.field("mgf_digest", &"...")
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.field("label", &self.label)
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.finish()
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}
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}
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/// Encrypts the given message with RSA and the padding scheme from
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/// [PKCS#1 OAEP].
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///
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/// The message must be no longer than the length of the public modulus minus
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/// `2 + (2 * hash.size())`.
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///
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/// [PKCS#1 OAEP]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1
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#[inline]
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fn encrypt<R: CryptoRngCore + ?Sized>(
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rng: &mut R,
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pub_key: &RsaPublicKey,
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msg: &[u8],
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digest: &mut dyn DynDigest,
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mgf_digest: &mut dyn DynDigest,
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label: Option<String>,
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) -> Result<Vec<u8>> {
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key::check_public(pub_key)?;
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let em = oaep_encrypt(rng, msg, digest, mgf_digest, label, pub_key.size())?;
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let int = Zeroizing::new(BigUint::from_bytes_be(&em));
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uint_to_be_pad(rsa_encrypt(pub_key, &int)?, pub_key.size())
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}
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/// Encrypts the given message with RSA and the padding scheme from
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/// [PKCS#1 OAEP].
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///
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/// The message must be no longer than the length of the public modulus minus
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/// `2 + (2 * hash.size())`.
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///
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/// [PKCS#1 OAEP]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1
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fn encrypt_digest<R: CryptoRngCore + ?Sized, D: Digest, MGD: Digest + FixedOutputReset>(
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rng: &mut R,
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pub_key: &RsaPublicKey,
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msg: &[u8],
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label: Option<String>,
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) -> Result<Vec<u8>> {
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key::check_public(pub_key)?;
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let em = oaep_encrypt_digest::<_, D, MGD>(rng, msg, label, pub_key.size())?;
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let int = Zeroizing::new(BigUint::from_bytes_be(&em));
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uint_to_be_pad(rsa_encrypt(pub_key, &int)?, pub_key.size())
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}
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/// Decrypts a plaintext using RSA and the padding scheme from [PKCS#1 OAEP].
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///
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/// If an `rng` is passed, it uses RSA blinding to avoid timing side-channel attacks.
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///
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/// Note that whether this function returns an error or not discloses secret
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/// information. If an attacker can cause this function to run repeatedly and
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/// learn whether each instance returned an error then they can decrypt and
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/// forge signatures as if they had the private key.
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///
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/// See `decrypt_session_key` for a way of solving this problem.
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///
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/// [PKCS#1 OAEP]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1
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#[inline]
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fn decrypt<R: CryptoRngCore + ?Sized>(
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rng: Option<&mut R>,
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priv_key: &RsaPrivateKey,
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ciphertext: &[u8],
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digest: &mut dyn DynDigest,
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mgf_digest: &mut dyn DynDigest,
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label: Option<String>,
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) -> Result<Vec<u8>> {
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key::check_public(priv_key)?;
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if ciphertext.len() != priv_key.size() {
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return Err(Error::Decryption);
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}
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let em = rsa_decrypt_and_check(priv_key, rng, &BigUint::from_bytes_be(ciphertext))?;
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let mut em = uint_to_zeroizing_be_pad(em, priv_key.size())?;
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oaep_decrypt(&mut em, digest, mgf_digest, label, priv_key.size())
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}
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/// Decrypts a plaintext using RSA and the padding scheme from [PKCS#1 OAEP].
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///
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/// If an `rng` is passed, it uses RSA blinding to avoid timing side-channel attacks.
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///
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/// Note that whether this function returns an error or not discloses secret
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/// information. If an attacker can cause this function to run repeatedly and
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/// learn whether each instance returned an error then they can decrypt and
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/// forge signatures as if they had the private key.
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///
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/// See `decrypt_session_key` for a way of solving this problem.
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///
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/// [PKCS#1 OAEP]: https://datatracker.ietf.org/doc/html/rfc8017#section-7.1
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#[inline]
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fn decrypt_digest<R: CryptoRngCore + ?Sized, D: Digest, MGD: Digest + FixedOutputReset>(
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rng: Option<&mut R>,
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priv_key: &RsaPrivateKey,
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ciphertext: &[u8],
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label: Option<String>,
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) -> Result<Vec<u8>> {
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key::check_public(priv_key)?;
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if ciphertext.len() != priv_key.size() {
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return Err(Error::Decryption);
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}
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let em = rsa_decrypt_and_check(priv_key, rng, &BigUint::from_bytes_be(ciphertext))?;
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let mut em = uint_to_zeroizing_be_pad(em, priv_key.size())?;
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oaep_decrypt_digest::<D, MGD>(&mut em, label, priv_key.size())
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}
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#[cfg(test)]
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mod tests {
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use crate::key::{RsaPrivateKey, RsaPublicKey};
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use crate::oaep::{DecryptingKey, EncryptingKey, Oaep};
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use crate::traits::PublicKeyParts;
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use crate::traits::{Decryptor, RandomizedDecryptor, RandomizedEncryptor};
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use alloc::string::String;
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use digest::{Digest, DynDigest, FixedOutputReset};
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use num_bigint::BigUint;
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use num_traits::FromPrimitive;
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use rand_chacha::{
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rand_core::{RngCore, SeedableRng},
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ChaCha8Rng,
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};
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use sha1::Sha1;
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use sha2::{Sha224, Sha256, Sha384, Sha512};
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use sha3::{Sha3_256, Sha3_384, Sha3_512};
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fn get_private_key() -> RsaPrivateKey {
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// -----BEGIN RSA PRIVATE KEY-----
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// MIIEpAIBAAKCAQEA05e4TZikwmE47RtpWoEG6tkdVTvwYEG2LT/cUKBB4iK49FKW
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// icG4LF5xVU9d1p+i9LYVjPDb61eBGg/DJ+HyjnT+dNO8Fmweq9wbi1e5NMqL5bAL
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// TymXW8yZrK9BW1m7KKZ4K7QaLDwpdrPBjbre9i8AxrsiZkAJUJbAzGDSL+fvmH11
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// xqgbENlr8pICivEQ3HzBu8Q9Iq2rN5oM1dgHjMeA/1zWIJ3qNMkiz3hPdxfkKNdb
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// WuyP8w5fAUFRB2bi4KuNRzyE6HELK5gifD2wlTN600UvGeK5v7zN2BSKv2d2+lUn
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// debnWVbkUimuWpxGlJurHmIvDkj1ZSSoTtNIOwIDAQABAoIBAQDE5wxokWLJTGYI
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// KBkbUrTYOSEV30hqmtvoMeRY1zlYMg3Bt1VFbpNwHpcC12+wuS+Q4B0f4kgVMoH+
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// eaqXY6kvrmnY1+zRRN4p+hNb0U+Vc+NJ5FAx47dpgvWDADgmxVLomjl8Gga9IWNI
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// hjDZLowrtkPXq+9wDaldaFyUFImkb1S1MW9itdLDp/G70TTLNzU6RGg/3J2V02RY
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// 3iL2xEBX/nSgpDbEMI9z9NpC81xHrBanE41IOvyR5B3DoRJzguDA9RGbAiG0/GOd
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// a5w4F3pt6bUm69iMONeYLAf5ig79h31Qiq4nW5RpFcAuLhEG0XXXTsZ3f16A0SwF
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// PZx74eNBAoGBAPgnu/OkGHfHzFmuv0LtSynDLe/LjtloY9WwkKBaiTDdYkohydz5
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// g4Vo/foN9luEYqXyrJE9bFb5dVMr2OePsHvUBcqZpIS89Z8Bm73cs5M/K85wYwC0
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// 97EQEgxd+QGBWQZ8NdowYaVshjWlK1QnOzEnG0MR8Hld9gIeY1XhpC5hAoGBANpI
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// F84Aid028q3mo/9BDHPsNL8bT2vaOEMb/t4RzvH39u+nDl+AY6Ox9uFylv+xX+76
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// CRKgMluNH9ZaVZ5xe1uWHsNFBy4OxSA9A0QdKa9NZAVKBFB0EM8dp457YRnZCexm
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// 5q1iW/mVsnmks8W+fYlc18W5xMSX/ecwkW/NtOQbAoGAHabpz4AhKFbodSLrWbzv
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// CUt4NroVFKdjnoodjfujfwJFF2SYMV5jN9LG3lVCxca43ulzc1tqka33Nfv8TBcg
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// WHuKQZ5ASVgm5VwU1wgDMSoQOve07MWy/yZTccTc1zA0ihDXgn3bfR/NnaVh2wlh
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// CkuI92eyW1494hztc7qlmqECgYEA1zenyOQ9ChDIW/ABGIahaZamNxsNRrDFMl3j
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// AD+cxHSRU59qC32CQH8ShRy/huHzTaPX2DZ9EEln76fnrS4Ey7uLH0rrFl1XvT6K
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// /timJgLvMEvXTx/xBtUdRN2fUqXtI9odbSyCtOYFL+zVl44HJq2UzY4pVRDrNcxs
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// SUkQJqsCgYBSaNfPBzR5rrstLtTdZrjImRW1LRQeDEky9WsMDtCTYUGJTsTSfVO8
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// hkU82MpbRVBFIYx+GWIJwcZRcC7OCQoV48vMJllxMAAjqG/p00rVJ+nvA7et/nNu
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// BoB0er/UmDm4Ly/97EO9A0PKMOE5YbMq9s3t3RlWcsdrU7dvw+p2+A==
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// -----END RSA PRIVATE KEY-----
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RsaPrivateKey::from_components(
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BigUint::parse_bytes(b"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", 16).unwrap(),
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BigUint::from_u64(65537).unwrap(),
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BigUint::parse_bytes(b"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", 16).unwrap(),
|
|
vec![
|
|
BigUint::parse_bytes(b"00f827bbf3a41877c7cc59aebf42ed4b29c32defcb8ed96863d5b090a05a8930dd624a21c9dcf9838568fdfa0df65b8462a5f2ac913d6c56f975532bd8e78fb07bd405ca99a484bcf59f019bbddcb3933f2bce706300b4f7b110120c5df9018159067c35da3061a56c8635a52b54273b31271b4311f0795df6021e6355e1a42e61",16).unwrap(),
|
|
BigUint::parse_bytes(b"00da4817ce0089dd36f2ade6a3ff410c73ec34bf1b4f6bda38431bfede11cef1f7f6efa70e5f8063a3b1f6e17296ffb15feefa0912a0325b8d1fd65a559e717b5b961ec345072e0ec5203d03441d29af4d64054a04507410cf1da78e7b6119d909ec66e6ad625bf995b279a4b3c5be7d895cd7c5b9c4c497fde730916fcdb4e41b", 16).unwrap()
|
|
],
|
|
).unwrap()
|
|
}
|
|
|
|
#[test]
|
|
fn test_encrypt_decrypt_oaep() {
|
|
let priv_key = get_private_key();
|
|
do_test_encrypt_decrypt_oaep::<Sha1>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha224>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha256>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha384>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha512>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha3_256>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha3_384>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep::<Sha3_512>(&priv_key);
|
|
|
|
do_test_oaep_with_different_hashes::<Sha1, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha224, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha256, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha384, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha512, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha3_256, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha3_384, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes::<Sha3_512, Sha1>(&priv_key);
|
|
}
|
|
|
|
fn get_label(rng: &mut ChaCha8Rng) -> Option<String> {
|
|
const GEN_ASCII_STR_CHARSET: &[u8; 64] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
|
|
abcdefghijklmnopqrstuvwxyz\
|
|
0123456789=+";
|
|
|
|
let mut buf = [0u8; 32];
|
|
rng.fill_bytes(&mut buf);
|
|
if buf[0] < (1 << 7) {
|
|
for v in buf.iter_mut() {
|
|
*v = GEN_ASCII_STR_CHARSET[(*v >> 2) as usize];
|
|
}
|
|
Some(core::str::from_utf8(&buf).unwrap().to_string())
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
|
|
fn do_test_encrypt_decrypt_oaep<D: 'static + Digest + DynDigest + Send + Sync>(
|
|
prk: &RsaPrivateKey,
|
|
) {
|
|
let mut rng = ChaCha8Rng::from_seed([42; 32]);
|
|
|
|
let k = prk.size();
|
|
|
|
for i in 1..8 {
|
|
let mut input = vec![0u8; i * 8];
|
|
rng.fill_bytes(&mut input);
|
|
|
|
if input.len() > k - 11 {
|
|
input = input[0..k - 11].to_vec();
|
|
}
|
|
let label = get_label(&mut rng);
|
|
|
|
let pub_key: RsaPublicKey = prk.into();
|
|
|
|
let ciphertext = if let Some(ref label) = label {
|
|
let padding = Oaep::new_with_label::<D, _>(label);
|
|
pub_key.encrypt(&mut rng, padding, &input).unwrap()
|
|
} else {
|
|
let padding = Oaep::new::<D>();
|
|
pub_key.encrypt(&mut rng, padding, &input).unwrap()
|
|
};
|
|
|
|
assert_ne!(input, ciphertext);
|
|
let blind: bool = rng.next_u32() < (1 << 31);
|
|
|
|
let padding = if let Some(ref label) = label {
|
|
Oaep::new_with_label::<D, _>(label)
|
|
} else {
|
|
Oaep::new::<D>()
|
|
};
|
|
|
|
let plaintext = if blind {
|
|
prk.decrypt(padding, &ciphertext).unwrap()
|
|
} else {
|
|
prk.decrypt_blinded(&mut rng, padding, &ciphertext).unwrap()
|
|
};
|
|
|
|
assert_eq!(input, plaintext);
|
|
}
|
|
}
|
|
|
|
fn do_test_oaep_with_different_hashes<
|
|
D: 'static + Digest + DynDigest + Send + Sync,
|
|
U: 'static + Digest + DynDigest + Send + Sync,
|
|
>(
|
|
prk: &RsaPrivateKey,
|
|
) {
|
|
let mut rng = ChaCha8Rng::from_seed([42; 32]);
|
|
|
|
let k = prk.size();
|
|
|
|
for i in 1..8 {
|
|
let mut input = vec![0u8; i * 8];
|
|
rng.fill_bytes(&mut input);
|
|
|
|
if input.len() > k - 11 {
|
|
input = input[0..k - 11].to_vec();
|
|
}
|
|
let label = get_label(&mut rng);
|
|
|
|
let pub_key: RsaPublicKey = prk.into();
|
|
|
|
let ciphertext = if let Some(ref label) = label {
|
|
let padding = Oaep::new_with_mgf_hash_and_label::<D, U, _>(label);
|
|
pub_key.encrypt(&mut rng, padding, &input).unwrap()
|
|
} else {
|
|
let padding = Oaep::new_with_mgf_hash::<D, U>();
|
|
pub_key.encrypt(&mut rng, padding, &input).unwrap()
|
|
};
|
|
|
|
assert_ne!(input, ciphertext);
|
|
let blind: bool = rng.next_u32() < (1 << 31);
|
|
|
|
let padding = if let Some(ref label) = label {
|
|
Oaep::new_with_mgf_hash_and_label::<D, U, _>(label)
|
|
} else {
|
|
Oaep::new_with_mgf_hash::<D, U>()
|
|
};
|
|
|
|
let plaintext = if blind {
|
|
prk.decrypt(padding, &ciphertext).unwrap()
|
|
} else {
|
|
prk.decrypt_blinded(&mut rng, padding, &ciphertext).unwrap()
|
|
};
|
|
|
|
assert_eq!(input, plaintext);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_decrypt_oaep_invalid_hash() {
|
|
let mut rng = ChaCha8Rng::from_seed([42; 32]);
|
|
let priv_key = get_private_key();
|
|
let pub_key: RsaPublicKey = (&priv_key).into();
|
|
let ciphertext = pub_key
|
|
.encrypt(&mut rng, Oaep::new::<Sha1>(), "a_plain_text".as_bytes())
|
|
.unwrap();
|
|
assert!(
|
|
priv_key
|
|
.decrypt_blinded(
|
|
&mut rng,
|
|
Oaep::new_with_label::<Sha1, _>("label"),
|
|
&ciphertext,
|
|
)
|
|
.is_err(),
|
|
"decrypt should have failed on hash verification"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_encrypt_decrypt_oaep_traits() {
|
|
let priv_key = get_private_key();
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha1>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha224>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha256>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha384>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha512>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha3_256>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha3_384>(&priv_key);
|
|
do_test_encrypt_decrypt_oaep_traits::<Sha3_512>(&priv_key);
|
|
|
|
do_test_oaep_with_different_hashes_traits::<Sha1, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha224, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha256, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha384, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha512, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha3_256, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha3_384, Sha1>(&priv_key);
|
|
do_test_oaep_with_different_hashes_traits::<Sha3_512, Sha1>(&priv_key);
|
|
}
|
|
|
|
fn do_test_encrypt_decrypt_oaep_traits<D: Digest + FixedOutputReset>(prk: &RsaPrivateKey) {
|
|
do_test_oaep_with_different_hashes_traits::<D, D>(prk);
|
|
}
|
|
|
|
fn do_test_oaep_with_different_hashes_traits<D: Digest, MGD: Digest + FixedOutputReset>(
|
|
prk: &RsaPrivateKey,
|
|
) {
|
|
let mut rng = ChaCha8Rng::from_seed([42; 32]);
|
|
|
|
let k = prk.size();
|
|
|
|
for i in 1..8 {
|
|
let mut input = vec![0u8; i * 8];
|
|
rng.fill_bytes(&mut input);
|
|
|
|
if input.len() > k - 11 {
|
|
input = input[0..k - 11].to_vec();
|
|
}
|
|
let label = get_label(&mut rng);
|
|
|
|
let pub_key: RsaPublicKey = prk.into();
|
|
|
|
let ciphertext = if let Some(ref label) = label {
|
|
let encrypting_key =
|
|
EncryptingKey::<D, MGD>::new_with_label(pub_key, label.clone());
|
|
encrypting_key.encrypt_with_rng(&mut rng, &input).unwrap()
|
|
} else {
|
|
let encrypting_key = EncryptingKey::<D, MGD>::new(pub_key);
|
|
encrypting_key.encrypt_with_rng(&mut rng, &input).unwrap()
|
|
};
|
|
|
|
assert_ne!(input, ciphertext);
|
|
let blind: bool = rng.next_u32() < (1 << 31);
|
|
|
|
let decrypting_key = if let Some(ref label) = label {
|
|
DecryptingKey::<D, MGD>::new_with_label(prk.clone(), label.clone())
|
|
} else {
|
|
DecryptingKey::<D, MGD>::new(prk.clone())
|
|
};
|
|
|
|
let plaintext = if blind {
|
|
decrypting_key.decrypt(&ciphertext).unwrap()
|
|
} else {
|
|
decrypting_key
|
|
.decrypt_with_rng(&mut rng, &ciphertext)
|
|
.unwrap()
|
|
};
|
|
|
|
assert_eq!(input, plaintext);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_decrypt_oaep_invalid_hash_traits() {
|
|
let mut rng = ChaCha8Rng::from_seed([42; 32]);
|
|
let priv_key = get_private_key();
|
|
let pub_key: RsaPublicKey = (&priv_key).into();
|
|
let encrypting_key = EncryptingKey::<Sha1>::new(pub_key);
|
|
let decrypting_key = DecryptingKey::<Sha1>::new_with_label(priv_key, "label");
|
|
let ciphertext = encrypting_key
|
|
.encrypt_with_rng(&mut rng, "a_plain_text".as_bytes())
|
|
.unwrap();
|
|
assert!(
|
|
decrypting_key
|
|
.decrypt_with_rng(&mut rng, &ciphertext)
|
|
.is_err(),
|
|
"decrypt should have failed on hash verification"
|
|
);
|
|
}
|
|
}
|