From 4eebef1961a1c01890fe11dc5f1b9f3a1ea705e0 Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Wed, 6 Sep 2023 23:23:31 -0400
Subject: add examples/

---
 examples/04-turboshake128/main.c | 56 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 examples/04-turboshake128/main.c

(limited to 'examples/04-turboshake128/main.c')

diff --git a/examples/04-turboshake128/main.c b/examples/04-turboshake128/main.c
new file mode 100644
index 0000000..a20a323
--- /dev/null
+++ b/examples/04-turboshake128/main.c
@@ -0,0 +1,56 @@
+//
+// turboshake128-example: Absorb 4096 bytes of data from /dev/urandom in
+// 1024 byte chunks, hash it with TurboShake128, then print 128 bytes of
+// result in 32 byte chunks (hex-encoded) to standard output.
+// output.
+//
+#include <stdint.h>
+#include <stdio.h>
+#include <err.h>
+#include "hex.h"
+#include "sha3.h"
+
+int main() {
+  // init turboshake
+  turboshake_t ts;
+  turboshake128_init(&ts);
+
+  // open source
+  FILE *fh = fopen("/dev/urandom", "rb");
+  if (!fh) {
+    err(-1, "fopen()");
+  }
+
+  {
+    // read and absorb
+    uint8_t buf[1024] = { 0 };
+    for (size_t i = 0; i < 4096/sizeof(buf); i++) {
+      // read data
+      if (!fread(buf, sizeof(buf), 1, fh)) {
+        err(-1, "fread()");
+      }
+
+      // absorb
+      turboshake128_absorb(&ts, buf, sizeof(buf));
+    }
+  }
+
+  // close source
+  if (!fclose(fh)) {
+    warn("fclose()");
+  }
+
+
+  printf("TurboShake128 output:\n");
+  {
+    // squeeze in 32 byte chunks, write to stdout
+    uint8_t buf[32] = { 0 };
+    for (size_t ofs = 0; ofs < 128; ofs += sizeof(buf)) {
+      turboshake128_squeeze(&ts, buf, sizeof(buf));
+      hex_write(stdout, buf, sizeof(buf));
+    }
+  }
+  printf("\n");
+
+  return 0;
+}
-- 
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