68 lines
2.0 KiB
Rust
68 lines
2.0 KiB
Rust
//! Helper functions for secret-key encrypted blobs
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//! that contain Zstd encrypted data
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use anyhow::{anyhow, Result};
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use serde::{Deserialize, Serialize};
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use zstd::stream::{decode_all as zstd_decode, encode_all as zstd_encode};
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//use sodiumoxide::crypto::box_ as publicbox;
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use sodiumoxide::crypto::secretbox::xsalsa20poly1305 as secretbox;
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pub use sodiumoxide::crypto::box_::{
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gen_keypair, PublicKey, SecretKey, PUBLICKEYBYTES, SECRETKEYBYTES,
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};
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pub use sodiumoxide::crypto::secretbox::xsalsa20poly1305::{gen_key, Key, KEYBYTES};
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pub fn open(cryptoblob: &[u8], key: &Key) -> Result<Vec<u8>> {
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use secretbox::{Nonce, NONCEBYTES};
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if cryptoblob.len() < NONCEBYTES {
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return Err(anyhow!("Cyphertext too short"));
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}
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// Decrypt -> get Zstd data
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let nonce = Nonce::from_slice(&cryptoblob[..NONCEBYTES]).unwrap();
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let zstdblob = secretbox::open(&cryptoblob[NONCEBYTES..], &nonce, key)
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.map_err(|_| anyhow!("Could not decrypt blob"))?;
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// Decompress zstd data
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let mut reader = &zstdblob[..];
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let data = zstd_decode(&mut reader)?;
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Ok(data)
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}
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pub fn seal(plainblob: &[u8], key: &Key) -> Result<Vec<u8>> {
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use secretbox::{gen_nonce, NONCEBYTES};
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// Compress data using zstd
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let mut reader = plainblob;
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let zstdblob = zstd_encode(&mut reader, 0)?;
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// Encrypt
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let nonce = gen_nonce();
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let cryptoblob = secretbox::seal(&zstdblob, &nonce, key);
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let mut res = Vec::with_capacity(NONCEBYTES + cryptoblob.len());
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res.extend(nonce.as_ref());
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res.extend(cryptoblob);
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Ok(res)
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}
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pub fn open_deserialize<T: for<'de> Deserialize<'de>>(cryptoblob: &[u8], key: &Key) -> Result<T> {
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let blob = open(cryptoblob, key)?;
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Ok(rmp_serde::decode::from_read_ref::<_, T>(&blob)?)
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}
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pub fn seal_serialize<T: Serialize>(obj: T, key: &Key) -> Result<Vec<u8>> {
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let mut wr = Vec::with_capacity(128);
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let mut se = rmp_serde::Serializer::new(&mut wr)
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.with_struct_map()
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.with_string_variants();
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obj.serialize(&mut se)?;
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seal(&wr, key)
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}
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