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.
73 lines
2.9 KiB
Rust
73 lines
2.9 KiB
Rust
macro_rules! generate_formatter {
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($name: ident) => {
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impl fmt::UpperHex for $name {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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for x in self.value.iter().rev() {
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f.write_char(tochar(true, x >> 60))?;
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f.write_char(tochar(true, x >> 56))?;
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f.write_char(tochar(true, x >> 52))?;
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f.write_char(tochar(true, x >> 48))?;
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f.write_char(tochar(true, x >> 44))?;
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f.write_char(tochar(true, x >> 40))?;
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f.write_char(tochar(true, x >> 36))?;
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f.write_char(tochar(true, x >> 32))?;
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f.write_char(tochar(true, x >> 28))?;
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f.write_char(tochar(true, x >> 24))?;
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f.write_char(tochar(true, x >> 20))?;
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f.write_char(tochar(true, x >> 16))?;
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f.write_char(tochar(true, x >> 12))?;
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f.write_char(tochar(true, x >> 8))?;
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f.write_char(tochar(true, x >> 4))?;
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f.write_char(tochar(true, x >> 0))?;
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}
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Ok(())
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}
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}
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impl fmt::LowerHex for $name {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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for x in self.value.iter().rev() {
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f.write_char(tochar(false, x >> 60))?;
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f.write_char(tochar(false, x >> 56))?;
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f.write_char(tochar(false, x >> 52))?;
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f.write_char(tochar(false, x >> 48))?;
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f.write_char(tochar(false, x >> 44))?;
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f.write_char(tochar(false, x >> 40))?;
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f.write_char(tochar(false, x >> 36))?;
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f.write_char(tochar(false, x >> 32))?;
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f.write_char(tochar(false, x >> 28))?;
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f.write_char(tochar(false, x >> 24))?;
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f.write_char(tochar(false, x >> 20))?;
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f.write_char(tochar(false, x >> 16))?;
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f.write_char(tochar(false, x >> 12))?;
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f.write_char(tochar(false, x >> 8))?;
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f.write_char(tochar(false, x >> 4))?;
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f.write_char(tochar(false, x >> 0))?;
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}
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Ok(())
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}
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}
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};
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}
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pub fn tochar(upper: bool, val: u64) -> char {
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match val & 0xF {
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0x0 => '0',
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0x1 => '1',
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0x2 => '2',
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0x3 => '3',
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0x4 => '4',
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0x5 => '5',
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0x6 => '6',
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0x7 => '7',
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0x8 => '8',
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0x9 => '9',
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0xA => if upper { 'A' } else { 'a' },
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0xB => if upper { 'B' } else { 'b' },
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0xC => if upper { 'C' } else { 'c' },
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0xD => if upper { 'D' } else { 'd' },
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0xE => if upper { 'E' } else { 'e' },
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0xF => if upper { 'F' } else { 'f' },
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_ => panic!("The world is broken, rejoice, rejoice.")
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}
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} |