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use super::ensure_initialized; use errors::*; use ffi; use std::mem; use utils; pub const CONTEXTBYTES: usize = ffi::hydro_secretbox_CONTEXTBYTES as usize; pub const HEADERBYTES: usize = ffi::hydro_secretbox_HEADERBYTES as usize; pub const KEYBYTES: usize = ffi::hydro_secretbox_KEYBYTES as usize; pub const PROBEBYTES: usize = ffi::hydro_secretbox_PROBEBYTES as usize; #[derive(Default, Debug, PartialEq, Eq, Copy, Clone)] pub struct Context([u8; CONTEXTBYTES]); #[derive(Debug, Clone)] pub struct Key([u8; KEYBYTES]); #[derive(Debug, Clone)] pub struct Probe([u8; PROBEBYTES]); pub fn encrypt(input: &[u8], msg_id: u64, context: &Context, key: &Key) -> Vec<u8> { let out_len = HEADERBYTES + input.len(); let mut out = Vec::with_capacity(out_len); unsafe { out.set_len(out_len); ffi::hydro_secretbox_encrypt( out.as_mut_ptr(), input.as_ptr() as *const _, input.len(), msg_id, context.0.as_ptr() as *const _, key.0.as_ptr(), ); } out } pub fn decrypt( input: &[u8], msg_id: u64, context: &Context, key: &Key, ) -> Result<Vec<u8>, HydroError> { if input.len() < HEADERBYTES { return Err(HydroError::DecryptionError); } let out_len = input.len() - HEADERBYTES; let mut out: Vec<u8> = Vec::with_capacity(out_len); unsafe { out.set_len(out_len); if ffi::hydro_secretbox_decrypt( out.as_mut_ptr() as *mut _, input.as_ptr(), input.len(), msg_id, context.0.as_ptr() as *const _, key.0.as_ptr(), ) != 0 { return Err(HydroError::DecryptionError); } } Ok(out) } impl Probe { pub fn create(input: &[u8], context: &Context, key: &Key) -> Probe { if input.len() < HEADERBYTES { panic!("A probe cannot be created for an impossible ciphertext") } unsafe { let mut probe: Probe = mem::uninitialized(); ffi::hydro_secretbox_probe_create( probe.0.as_mut_ptr(), input.as_ptr(), input.len(), context.0.as_ptr() as *const _, key.0.as_ptr(), ); probe } } pub fn verify(&self, input: &[u8], context: &Context, key: &Key) -> Result<(), HydroError> { if unsafe { ffi::hydro_secretbox_probe_verify( self.0.as_ptr(), input.as_ptr(), input.len(), context.0.as_ptr() as *const _, key.0.as_ptr(), ) } != 0 { return Err(HydroError::InvalidProbe); } Ok(()) } } impl Drop for Key { fn drop(&mut self) { utils::memzero(self) } } impl From<[u8; KEYBYTES]> for Key { #[inline] fn from(key: [u8; KEYBYTES]) -> Key { Key(key) } } impl Into<[u8; KEYBYTES]> for Key { #[inline] fn into(self) -> [u8; KEYBYTES] { self.0 } } impl AsRef<[u8]> for Key { fn as_ref(&self) -> &[u8] { &self.0 as &[u8] } } impl PartialEq for Key { fn eq(&self, other: &Self) -> bool { utils::equal(self, other) } } impl Eq for Key {} impl Key { pub fn gen() -> Key { ensure_initialized(); unsafe { let mut key: Key = mem::uninitialized(); ffi::hydro_kdf_keygen(key.0.as_mut_ptr()); key } } } impl Drop for Probe { fn drop(&mut self) { utils::memzero(self) } } impl From<[u8; PROBEBYTES]> for Probe { #[inline] fn from(probe: [u8; PROBEBYTES]) -> Probe { Probe(probe) } } impl Into<[u8; PROBEBYTES]> for Probe { #[inline] fn into(self) -> [u8; PROBEBYTES] { self.0 } } impl AsRef<[u8]> for Probe { fn as_ref(&self) -> &[u8] { &self.0 as &[u8] } } impl PartialEq for Probe { fn eq(&self, other: &Self) -> bool { utils::equal(self, other) } } impl Eq for Probe {} impl From<&'static str> for Context { fn from(context_str: &'static str) -> Context { let context_str_u8 = context_str.as_bytes(); let context_str_u8_len = context_str_u8.len(); if context_str_u8_len > CONTEXTBYTES { panic!("Context too long"); } let mut context = Context::default(); context.0[..context_str_u8_len].copy_from_slice(context_str_u8); context } } impl From<[u8; CONTEXTBYTES]> for Context { #[inline] fn from(context: [u8; CONTEXTBYTES]) -> Context { Context(context) } } impl Into<[u8; CONTEXTBYTES]> for Context { #[inline] fn into(self) -> [u8; CONTEXTBYTES] { self.0 } } #[cfg(test)] mod tests { use ::*; #[test] fn test_secretbox() { init().unwrap(); let context = "tests".into(); let key = secretbox::Key::gen(); let ciphertext = secretbox::encrypt(b"test message", 1, &context, &key); let decrypted = secretbox::decrypt(&ciphertext, 1, &context, &key).unwrap(); assert_eq!(decrypted, b"test message"); let probe = secretbox::Probe::create(&ciphertext, &context, &key); probe.verify(&ciphertext, &context, &key).unwrap(); let contextx: [u8; secretbox::CONTEXTBYTES] = context.into(); let contexty: secretbox::Context = contextx.into(); assert_eq!(context, contexty); } }