Initialize Butchunker project structure and policy system

1 files changed, 38 insertions, 0 deletions

diff --git a/src/core/hash.rs b/src/core/hash.rs
new file mode 100644
index 0000000..36a62b3
--- /dev/null
+++ b/src/core/hash.rs
@@ -0,0 +1,38 @@
+use blake3::Hasher as Blake3Hasher;
+use sha2::{Digest as Sha2Digest, Sha256};
+
+const SALT: &[u8] = b"Dude@";
+
+#[derive(Debug, Default)]
+pub enum ChunkWriteHash {
+    #[default]
+    Blake3,
+    Sha256,
+}
+
+impl ChunkWriteHash {
+    pub fn hash(&self, d: &[u8]) -> [u8; 32] {
+        match self {
+            ChunkWriteHash::Blake3 => hash_blake3(d),
+            ChunkWriteHash::Sha256 => hash_sha256(d),
+        }
+    }
+}
+
+/// Compute the Blake3 hash of the data with a salt
+/// Returns a 32-byte hash value
+pub fn hash_blake3(d: &[u8]) -> [u8; 32] {
+    let mut hasher = Blake3Hasher::new();
+    hasher.update(SALT);
+    hasher.update(d);
+    *hasher.finalize().as_bytes()
+}
+
+/// Compute the SHA-256 hash of the data with a salt
+/// Returns a 32-byte hash value
+pub fn hash_sha256(d: &[u8]) -> [u8; 32] {
+    let mut hasher = Sha256::new();
+    hasher.update(SALT);
+    hasher.update(d);
+    hasher.finalize().into()
+}