1 files changed, 58 insertions, 0 deletions
diff --git a/src/checksum/mod.rs b/src/checksum/mod.rs
new file mode 100644
index 0000000..1dbf62c
--- /dev/null
+++ b/src/checksum/mod.rs
@@ -0,0 +1,58 @@
+// Copyright 2022-2024 Gabriel Bjørnager Jensen.
+
+use crate::deserialise::{Deserialise, DStream};
+use crate::serialise::{SStream, Serialise};
+
+use sha2::{Digest, Sha256};
+use std::fmt::{Debug, Display, Formatter};
+
+#[derive(Clone, Eq, PartialEq)]
+#[repr(transparent)]
+pub struct Checksum(pub(in super) [u8; 0x20]);
+
+impl Checksum {
+	#[must_use]
+	pub fn new<T: Serialise>(data: &T) -> Self {
+		let data = SStream::from(data);
+
+		let mut hasher = Sha256::new();
+		hasher.update(data);
+
+		Self(hasher.finalize().into())
+	}
+}
+
+impl Debug for Checksum {
+	#[inline(always)]
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result { Display::fmt(self, f) }
+}
+
+impl Deserialise for Checksum {
+	fn deserialise(stream: &mut DStream) -> Result<Self, Box<dyn std::error::Error>> {
+		let data = Deserialise::deserialise(stream)?;
+
+		Ok(Self(data))
+	}
+}
+
+impl Display for Checksum {
+	fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
+		write!(f,
+			"{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}{:x}",
+			self.0[0x1F], self.0[0x1E], self.0[0x1D], self.0[0x1C],
+			self.0[0x1B], self.0[0x1A], self.0[0x19], self.0[0x18],
+			self.0[0x17], self.0[0x16], self.0[0x15], self.0[0x14],
+			self.0[0x13], self.0[0x12], self.0[0x11], self.0[0x10],
+			self.0[0x0F], self.0[0x0E], self.0[0x0D], self.0[0x0C],
+			self.0[0x0B], self.0[0x0A], self.0[0x09], self.0[0x08],
+			self.0[0x07], self.0[0x06], self.0[0x05], self.0[0x04],
+			self.0[0x03], self.0[0x02], self.0[0x01], self.0[0x00],
+		)
+	}
+}
+
+impl Serialise for Checksum {
+	fn serialise(&self, stream: &mut SStream) {
+		self.0.serialise(stream);
+	}
+}