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66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
use crate::crypto::*;
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use crate::dns::*;
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use crate::dnscrypt_certs::*;
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use crate::errors::*;
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use libsodium_sys::*;
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use rand::prelude::*;
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use std::ffi::CStr;
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use std::ptr;
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pub const DNSCRYPT_CLIENT_MAGIC_SIZE: usize = 8;
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pub const DNSCRYPT_CLIENT_PK_SIZE: usize = 32;
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pub const DNSCRYPT_CLIENT_NONCE_SIZE: usize =
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crypto_box_curve25519xchacha20poly1305_HALFNONCEBYTES as usize;
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pub fn decrypt(
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wrapped_packet: &[u8],
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dnscrypt_encryption_params_set: &[DNSCryptEncryptionParams],
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) -> Result<
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(
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SharedKey,
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[u8; crypto_box_curve25519xchacha20poly1305_NONCEBYTES as usize],
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Vec<u8>,
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),
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Error,
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> {
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ensure!(
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wrapped_packet.len()
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>= DNSCRYPT_CLIENT_MAGIC_SIZE
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+ DNSCRYPT_CLIENT_PK_SIZE
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+ DNSCRYPT_CLIENT_NONCE_SIZE
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+ DNS_HEADER_SIZE,
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"Short packet"
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);
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let client_magic = &wrapped_packet[..DNSCRYPT_CLIENT_MAGIC_SIZE];
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let client_pk = &wrapped_packet
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[DNSCRYPT_CLIENT_MAGIC_SIZE..DNSCRYPT_CLIENT_MAGIC_SIZE + DNSCRYPT_CLIENT_PK_SIZE];
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let client_nonce = &wrapped_packet[DNSCRYPT_CLIENT_MAGIC_SIZE + DNSCRYPT_CLIENT_PK_SIZE
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..DNSCRYPT_CLIENT_MAGIC_SIZE + DNSCRYPT_CLIENT_PK_SIZE + DNSCRYPT_CLIENT_NONCE_SIZE];
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let encrypted_packet = &wrapped_packet
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[DNSCRYPT_CLIENT_MAGIC_SIZE + DNSCRYPT_CLIENT_PK_SIZE + DNSCRYPT_CLIENT_NONCE_SIZE..];
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let encrypted_packet_len = encrypted_packet.len();
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let dnscrypt_encryption_params = dnscrypt_encryption_params_set
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.iter()
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.find(|p| p.client_magic() == client_magic)
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.ok_or_else(|| format_err!("Client magic not found"))?;
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let mut nonce = [0u8; crypto_box_curve25519xchacha20poly1305_NONCEBYTES as usize];
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&mut nonce[..DNSCRYPT_CLIENT_NONCE_SIZE].copy_from_slice(client_nonce);
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let resolver_kp = dnscrypt_encryption_params.resolver_kp();
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let shared_key = resolver_kp.compute_shared_key(client_pk)?;
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let packet = shared_key.decrypt(&nonce, encrypted_packet)?;
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rand::thread_rng().fill_bytes(&mut nonce[DNSCRYPT_CLIENT_NONCE_SIZE..]);
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Ok((shared_key, nonce, packet))
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}
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pub fn encrypt(
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packet: &[u8],
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shared_key: &SharedKey,
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nonce: &[u8; crypto_box_curve25519xchacha20poly1305_NONCEBYTES as usize],
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) {
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//
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}
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