1 files changed, 43 insertions, 0 deletions
diff --git a/keccak.cuh b/keccak.cuh
new file mode 100644
index 0000000..68dbde1
--- /dev/null
+++ b/keccak.cuh
@@ -0,0 +1,43 @@
+#pragma once
+
+/* Compute a keccak-like hash in 1024 threads via values supplied
+   locally in each thread (never leaving register memory). The input
+   stream given by each warp has to be synchronised: the same amount of
+   data has to be hashed at the same time).
+
+   Approach:
+   1. Compute a keccak-hash of an input stream of the local warp until
+      end of data is reached. 25 (of the 32 threads) store one 32-bit
+      word each.
+   2. Compute the Keccak-Hash of all those hashes by streaming them to
+      one warp via shared memory.
+*/
+
+#include <inttypes.h>
+
+namespace keccak {
+
+const uint32_t digest_words = 256 / 32;
+struct Result {
+  uint32_t digest[digest_words];
+};
+
+union State {
+  uint32_t
+    a[5][5], 
+    s[25];
+};
+
+struct SharedState {
+  Result digests[1024 / 32]; // digest from 32 warps
+};
+
+union RegisterState {
+  uint32_t a;
+};
+
+__device__ void init(RegisterState &s);
+__device__ void add(RegisterState &s, uint32_t data);
+__device__ void finish(RegisterState &s, SharedState &ss, Result &dst);
+
+} // namespace keccak