Adam Wick
fa872c951a
Previously, we used a little bit of generation to drive a lot of Rust macros. This works, but it's a little confusing to read and write. In addition, we used a lot of implementations with variable timings based on their input, which isn't great for crypto. This is the start of an attempt to just generate all of the relevant Rust code directly, and to use timing-channel resistant implementations for most of the routines.
103 lines
2.9 KiB
Rust
103 lines
2.9 KiB
Rust
macro_rules! generate_base_conversions
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{
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($name: ident) => {
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generate_base_type_convert!($name, u8);
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generate_base_type_convert!($name, u16);
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generate_base_type_convert!($name, u32);
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generate_base_type_convert!($name, u64);
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generate_base_type_convert!($name, usize);
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impl From<u128> for $name {
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fn from(x: u128) -> $name {
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let mut res = $name::zero();
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res.value[0] = x as u64;
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res.value[1] = (x >> 64) as u64;
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res
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}
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}
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};
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() => {};
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}
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#[cfg(test)]
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macro_rules! generate_conversion_tests
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{
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($name: ident, $lname: ident) => {
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#[cfg(test)]
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mod $lname {
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use super::super::super::*;
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use std::convert::From;
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quickcheck! {
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fn conversion_u8( x: u8) -> bool { x == u8::from($name::from(x)) }
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fn conversion_u16( x: u16) -> bool { x == u16::from($name::from(x)) }
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fn conversion_u32( x: u32) -> bool { x == u32::from($name::from(x)) }
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fn conversion_u64( x: u64) -> bool { x == u64::from($name::from(x)) }
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fn conversion_usize(x: usize) -> bool { x == usize::from($name::from(x)) }
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}
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}
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}
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}
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macro_rules! conversion_impls
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{
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($name: ident, $other: ident) => {
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impl<'a> From<&'a $other> for $name {
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fn from(x: &$other) -> $name {
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let mut res = $name::zero();
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let len = res.value.len();
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assert!(x.value.len() > res.value.len());
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res.value.copy_from_slice(&x.value[0..len]);
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res
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}
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}
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impl<'a> From<&'a $name> for $other {
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fn from(x: &$name) -> $other {
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let mut res = $other::zero();
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let len = x.value.len();
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assert!(x.value.len() < res.value.len());
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res.value[0..len].copy_from_slice(&x.value);
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res
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}
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}
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impl From<$other> for $name {
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fn from(x: $other) -> $name {
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$name::from(&x)
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}
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}
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impl From<$name> for $other {
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fn from(x: $name) -> $other {
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$other::from(&x)
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}
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}
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};
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}
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macro_rules! generate_base_type_convert
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{
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($name: ident, $base: ident) => {
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impl From<$base> for $name {
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fn from(x: $base) -> $name {
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let mut res = $name::zero();
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res.value[0] = x as u64;
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res
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}
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}
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impl From<$name> for $base {
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fn from(x: $name) -> $base {
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x.value[0] as $base
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}
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}
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impl<'a> From<&'a $name> for $base {
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fn from(x: &$name) -> $base {
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x.value[0] as $base
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}
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}
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}
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} |