Add sha256 hash and ordering.

src/crypto/mod.rs

@@ -0,0 +1,54 @@
+use alloc::string::String;
+
+mod hash;
+mod ordering;
+
+pub use hash::sha256;
+pub use ordering::feistel_shuffle;
+
+#[macro_export]
+macro_rules! hash_256 {
+    ($s:literal) => {{
+        // string literal arm
+        const HASH: [u8; 32] = $crate::crypto::sha256($s.as_bytes());
+        HASH
+    }};
+    ($n:expr) => {{
+        // integer/expression arm
+        const BYTES: [u8; 8] = ($n as u64).to_be_bytes();
+        const HASH: [u8; 32] = $crate::crypto::sha256(&BYTES);
+        HASH
+    }};
+}
+
+#[macro_export]
+macro_rules! hash_32 {
+    ($s:literal) => {{
+        // string literal arm
+        const HASH: [u8; 32] = $crate::crypto::sha256($s.as_bytes());
+        const RESULT: u32 = u32::from_be_bytes([HASH[0], HASH[8], HASH[16], HASH[24]]);
+        RESULT
+    }};
+    ($n:expr) => {{
+        // integer/expression arm
+        const BYTES: [u8; 8] = ($n as u64).to_be_bytes();
+        const HASH: [u8; 32] = $crate::crypto::sha256(&BYTES);
+        const RESULT: u32 = u32::from_be_bytes([HASH[0], HASH[8], HASH[16], HASH[24]]);
+        RESULT
+    }};
+}
+
+pub fn hash_string_32(input: String) -> u32 {
+    let hash: [u8; 32] = sha256(input.as_bytes());
+    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
+}
+
+pub fn hash_str_32(input: &str) -> u32 {
+    let hash: [u8; 32] = sha256(input.as_bytes());
+    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
+}
+
+pub fn hash_32(input: u32) -> u32 {
+    let hash: [u8; 32] = sha256(&input.to_be_bytes());
+    u32::from_be_bytes([hash[0], hash[8], hash[16], hash[24]])
+}