Added hash module with blocking implementation. Included SHA256 example.

1 files changed, 49 insertions, 0 deletions

diff --git a/examples/stm32f7/src/bin/hash.rs b/examples/stm32f7/src/bin/hash.rs
new file mode 100644
index 000000000..1fd0e87eb
--- /dev/null
+++ b/examples/stm32f7/src/bin/hash.rs
@@ -0,0 +1,49 @@
+#![no_std]
+#![no_main]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_stm32::Config;
+use embassy_time::{Duration, Instant};
+use {defmt_rtt as _, panic_probe as _};
+
+use embassy_stm32::hash::*;
+use sha2::{Digest, Sha256};
+
+const TEST_STRING_1: &[u8] = b"hello world";
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let config = Config::default();
+    let p = embassy_stm32::init(config);
+
+    let hw_start_time = Instant::now();
+
+    // Compute a digest in hardware.
+    let mut hw_hasher = Hash::new(p.HASH);
+    let mut context = hw_hasher.start(Algorithm::SHA256, DataType::Width8);
+    hw_hasher.update(&mut context, TEST_STRING_1);
+    let mut buffer: [u8; 32] = [0; 32];
+    let hw_digest = hw_hasher.finish(context, &mut buffer);
+
+    let hw_end_time = Instant::now();
+    let hw_execution_time = hw_end_time - hw_start_time;
+
+    let sw_start_time = Instant::now();
+
+    // Compute a digest in software.
+    let mut sw_hasher = Sha256::new();
+    sw_hasher.update(TEST_STRING_1);
+    let sw_digest = sw_hasher.finalize();
+
+    let sw_end_time = Instant::now();
+    let sw_execution_time = sw_end_time - sw_start_time;
+
+    info!("Hardware Digest: {:?}", hw_digest);
+    info!("Software Digest: {:?}", sw_digest[..]);
+    info!("Hardware Execution Time: {:?}", hw_execution_time);
+    info!("Software Execution Time: {:?}", sw_execution_time);
+    assert_eq!(*hw_digest, sw_digest[..]);
+
+    loop {}
+}