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-rw-r--r--third_party/rust/digest/src/dyn_digest.rs56
1 files changed, 56 insertions, 0 deletions
diff --git a/third_party/rust/digest/src/dyn_digest.rs b/third_party/rust/digest/src/dyn_digest.rs
new file mode 100644
index 0000000000..789cdc86ef
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+++ b/third_party/rust/digest/src/dyn_digest.rs
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+#![cfg(feature = "std")]
+use std::boxed::Box;
+
+use super::{Input, FixedOutput, Reset};
+use generic_array::typenum::Unsigned;
+
+/// The `DynDigest` trait is a modification of `Digest` trait suitable
+/// for trait objects.
+pub trait DynDigest {
+ /// Digest input data.
+ ///
+ /// This method can be called repeatedly for use with streaming messages.
+ fn input(&mut self, data: &[u8]);
+
+ /// Retrieve result and reset hasher instance
+ fn result_reset(&mut self) -> Box<[u8]>;
+
+ /// Retrieve result and consume boxed hasher instance
+ fn result(self: Box<Self>) -> Box<[u8]>;
+
+ /// Reset hasher instance to its initial state.
+ fn reset(&mut self);
+
+ /// Get output size of the hasher
+ fn output_size(&self) -> usize;
+}
+
+impl<D: Input + FixedOutput + Reset + Clone> DynDigest for D {
+ /// Digest input data.
+ ///
+ /// This method can be called repeatedly for use with streaming messages.
+ fn input(&mut self, data: &[u8]) {
+ Input::input(self, data);
+ }
+
+ /// Retrieve result and reset hasher instance
+ fn result_reset(&mut self) -> Box<[u8]> {
+ let res = self.clone().fixed_result().to_vec().into_boxed_slice();
+ Reset::reset(self);
+ res
+ }
+
+ /// Retrieve result and consume boxed hasher instance
+ fn result(self: Box<Self>) -> Box<[u8]> {
+ self.fixed_result().to_vec().into_boxed_slice()
+ }
+
+ fn reset(&mut self) {
+ Reset::reset(self);
+ }
+
+ /// Get output size of the hasher
+ fn output_size(&self) -> usize {
+ <Self as FixedOutput>::OutputSize::to_usize()
+ }
+}