src/rsa/keypair/oaep.rs

// Copyright 2015-2019 Brian Smith.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

//! RSA OAEP decryption.

use super::RsaKeyPair;
use crate::{error, rsa::padding};
use alloc::boxed::Box;

impl RsaKeyPair {
    /// OAEP decrypts `ciphertext`, returning the plaintext.
    pub fn decrypt_oaep_bytes_less_safe(
        &self,
        encoding: &'static padding::OaepEncoding,
        ciphertext: &[u8],
    ) -> Result<Box<[u8]>, error::Unspecified> {
        self.rsa_private(ciphertext, |padded_buffer| {
            let plaintext =
                padding::oaep_decode(encoding, padded_buffer, self.public().n().len_bits())?;
            Ok(plaintext.into())
        })
    }
}