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macro_rules! impl_groestl { ($state:ident, $output:ident, $block:ident) => ( #[derive(Clone)] pub struct $state { groestl: Groestl<$block>, } impl Default for $state { fn default() -> Self { $state{groestl: Groestl::new($output::to_usize()).unwrap()} } } impl digest::BlockInput for $state { type BlockSize = $block; } impl digest::Input for $state { fn process(&mut self, input: &[u8]) { self.groestl.process(input); } } impl digest::FixedOutput for $state { type OutputSize = $output; fn fixed_result(self) -> GenericArray<u8, Self::OutputSize> { let block = self.groestl.finalize(); let n = block.len() - Self::OutputSize::to_usize(); GenericArray::clone_from_slice( &block[n..]) } } impl_opaque_debug!($state); ) } macro_rules! impl_variable_groestl { ($state:ident, $block:ident, $min:expr, $max:expr) => ( #[derive(Clone)] pub struct $state { groestl: Groestl<$block>, } impl digest::BlockInput for $state { type BlockSize = $block; } impl digest::Input for $state { fn process(&mut self, input: &[u8]) { self.groestl.process(input); } } impl digest::VariableOutput for $state { fn new(output_size: usize) -> Result<Self, digest::InvalidLength> { if output_size == $min || output_size > $max { return Err(digest::InvalidLength); } Ok($state {groestl: Groestl::new(output_size).unwrap()}) } fn output_size(&self) -> usize { self.groestl.output_size } fn variable_result(self, buffer: &mut [u8]) -> Result<&[u8], digest::InvalidLength> { if buffer.len() != self.groestl.output_size { return Err(digest::InvalidLength); } let block = self.groestl.finalize(); let n = block.len() - buffer.len(); buffer.copy_from_slice(&block[n..]); Ok(buffer) } } impl_opaque_debug!($state); ) }