From 4b8a5554b12403e74605e8aef07d4f3d8e6b66a9 Mon Sep 17 00:00:00 2001
From: Balazs Komuves <bkomuves@gmail.com>
Date: Sat, 14 Oct 2023 18:23:51 +0200
Subject: [PATCH] add SHA256 benchmark via the Unix tool and pipes

---
 hash/cpu/bench/SHA256/Unix/build.sh   |  3 +++
 hash/cpu/bench/SHA256/Unix/fakedata.c | 38 +++++++++++++++++++++++++++
 hash/cpu/bench/SHA256/Unix/run.sh     |  3 +++
 3 files changed, 44 insertions(+)
 create mode 100755 hash/cpu/bench/SHA256/Unix/build.sh
 create mode 100644 hash/cpu/bench/SHA256/Unix/fakedata.c
 create mode 100755 hash/cpu/bench/SHA256/Unix/run.sh

diff --git a/hash/cpu/bench/SHA256/Unix/build.sh b/hash/cpu/bench/SHA256/Unix/build.sh
new file mode 100755
index 0000000..8c74da7
--- /dev/null
+++ b/hash/cpu/bench/SHA256/Unix/build.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+gcc -O3 fakedata.c
diff --git a/hash/cpu/bench/SHA256/Unix/fakedata.c b/hash/cpu/bench/SHA256/Unix/fakedata.c
new file mode 100644
index 0000000..0cfd5fe
--- /dev/null
+++ b/hash/cpu/bench/SHA256/Unix/fakedata.c
@@ -0,0 +1,38 @@
+
+// generate given amount of fake data to be hashed, and push it to standard output
+
+#include <stdio.h>
+#include <stdlib.h>
+
+void generate(megabytes) {
+  
+  unsigned char buffer[257];
+  for(int i=0;i<256;i++) { buffer[i] = 1+(i%255); }
+  buffer[256] = 0;
+
+  for(int i=0;i<megabytes;i++) {
+    for(int j=0;j<4096;j++) {
+      fputs( (char*)buffer, stdout);
+    }
+  }
+
+}
+
+int main( int argc, char *argv[] ) {
+  
+  int megabytes = 1;
+  switch(argc) {
+
+    case 2:
+      megabytes = atoi(argv[1]);
+      generate(megabytes);
+      break;
+
+    default:
+      printf("usage:\n");
+      printf("$ fakedata <amount_in_megabytes>:\n");
+      exit(-1);
+      break;
+
+  }
+}
\ No newline at end of file
diff --git a/hash/cpu/bench/SHA256/Unix/run.sh b/hash/cpu/bench/SHA256/Unix/run.sh
new file mode 100755
index 0000000..43d81b7
--- /dev/null
+++ b/hash/cpu/bench/SHA256/Unix/run.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+./a.out $ZKBENCH_MEGABYTES | shasum -a256 -b -
\ No newline at end of file