adds Seek trait requirement to KemReader

Cargo.toml

@@ -5,7 +5,7 @@
 
 [package]
 authors = ["sean watters <sean@watters.io>"]
-description = "Enabling E2EE for a broad range of applications."
+description = "Enabling E2EE for a range of applications."
 categories = ["cryptography"]
 edition = "2021"
 homepage = "https://github.com/seanwatters/rgp"

src/crypto/encrypt.rs

@@ -5,12 +5,13 @@ Licensed under the MIT license <LICENSE or https://opensource.org/licenses/MIT>.
 This file may not be copied, modified, or distributed except according to those terms.
 */
 
-use std::{fs::File, io::Read};
+use std::fs::File;
+use std::io::{Read, Seek};
 
 use super::{dh_encrypt, hmac_encrypt, kem_encrypt, session_encrypt, KemKeyReader, KEY_SIZE};
 
 /// encapsulates the parameters and mode for encryption.
-pub enum Encrypt<'a, R: Read = File> {
+pub enum Encrypt<'a, R: Read + Seek = File> {
     /// generates random content key and encrypts for all
     /// recipients with their respective Diffie-Hellman shared secret.
     Dh(

src/crypto/modes/kem.rs

@@ -9,7 +9,7 @@ use super::super::{
     base_decrypt, base_encrypt, bytes_to_usize, usize_to_bytes, KEY_SIZE, NONCE_SIZE,
 };
 
-use std::io::{BufReader, Read};
+use std::io::{BufReader, Read, Seek};
 #[cfg(feature = "multi-thread")]
 use std::sync::mpsc::channel;
 
@@ -108,14 +108,14 @@ pub fn generate_kem_keys() -> ([u8; KEM_SECRET_KEY_SIZE], [u8; KEM_PUB_KEY_SIZE]
 }
 
 /// for reading a large volume of Classic McEliece public keys
-pub struct KemKeyReader<R: Read> {
+pub struct KemKeyReader<R: Read + Seek> {
     pub reader: BufReader<R>,
 
     /// for Kem + Dh hybrid
     pub dh_priv_key: Option<[u8; KEY_SIZE]>,
 }
 
-impl<R: Read> KemKeyReader<R> {
+impl<R: Read + Seek> KemKeyReader<R> {
     /// public key reader with a buffer size of 261120.
     ///
     /// for files that contain only McEliece public keys all in one line.
@@ -140,7 +140,7 @@ impl<R: Read> KemKeyReader<R> {
 
 /// per-recipient content key encryption.
 #[inline(always)]
-fn kem_encrypt_keys<R: Read>(
+fn kem_encrypt_keys<R: Read + Seek>(
     key_reader: &mut KemKeyReader<R>,
     nonce: &GenericArray<u8, typenum::U24>,
     content_key: &GenericArray<u8, typenum::U32>,
@@ -222,7 +222,7 @@ fn kem_encrypt_keys<R: Read>(
 
 /// kem encryption.
 #[inline(always)]
-pub fn kem_encrypt<'a, R: Read>(
+pub fn kem_encrypt<'a, R: Read + Seek>(
     fingerprint: [u8; 32],
     mut content: Vec<u8>,
     key_reader: &mut KemKeyReader<R>,