76 lines
1.7 KiB
Rust
76 lines
1.7 KiB
Rust
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//! Symmetric cypher stuff
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#[derive(Debug, Copy, Clone)]
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#[repr(C)]
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#[allow(missing_debug_implementations)]
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struct NonceNum {
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high: u32,
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low: u64,
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}
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/// Nonce with sequence for chach20_apoly1305
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#[repr(C)]
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pub union Nonce {
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num: NonceNum,
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raw: ::core::mem::ManuallyDrop<::ring::aead::Nonce>,
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easy_from: [u8; 12],
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}
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impl ::core::fmt::Debug for Nonce {
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fn fmt(
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&self,
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f: &mut core::fmt::Formatter<'_>,
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) -> Result<(), ::std::fmt::Error> {
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// use the Debug from NonceNum
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#[allow(unsafe_code)]
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unsafe {
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core::fmt::Debug::fmt(&self.num, f)
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}
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}
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}
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impl Nonce {
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// FIXME: nonces should be random!
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/// Generate a new random Nonce
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pub fn new() -> Self {
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#[allow(unsafe_code)]
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unsafe {
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Self {
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num: NonceNum { high: 42, low: 69 },
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}
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}
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}
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/// Create Nonce from array
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pub fn from_slice(raw: [u8; 12]) -> Self {
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#[allow(unsafe_code)]
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unsafe {
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Self { easy_from: raw }
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}
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}
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}
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//impl Copy for Nonce {}
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impl Clone for Nonce {
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fn clone(&self) -> Self {
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#[allow(unsafe_code)]
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unsafe {
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Self { num: self.num }
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}
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}
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}
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impl ::ring::aead::NonceSequence for Nonce {
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fn advance(
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&mut self,
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) -> Result<::ring::aead::Nonce, ::ring::error::Unspecified> {
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#[allow(unsafe_code)]
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unsafe {
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let old_low = self.num.low;
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self.num.low = self.num.low + 1;
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if self.num.low < old_low {
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self.num.high = self.num.high;
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}
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Ok(::core::mem::ManuallyDrop::take(&mut self.raw))
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}
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}
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}
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