From c7f630ed23144939a540219787c7be3ffe14b24c Mon Sep 17 00:00:00 2001
From: Paul Duncan <pabs@pablotron.org>
Date: Fri, 1 Sep 2023 16:45:37 -0400
Subject: initial commit

---
 main.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 main.c

(limited to 'main.c')

diff --git a/main.c b/main.c
new file mode 100644
index 0000000..62fc21b
--- /dev/null
+++ b/main.c
@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <string.h>
+#include "sha3.h"
+
+// available functions
+static const struct {
+  const char *name;
+  const size_t size;
+  void (*func)(const uint8_t *, size_t, uint8_t *);
+} fns[] = {{
+  .name = "sha3-224",
+  .size = 28,
+  .func = sha3_224,
+}, {
+  .name = "sha3-256",
+  .size = 32,
+  .func = sha3_256,
+}, {
+  .name = "sha3-384",
+  .size = 48,
+  .func = sha3_384,
+}, {
+  .name = "sha3-512",
+  .size = 64,
+  .func = sha3_512,
+}, {
+  .name = "shake128",
+  .size = 16,
+  .func = shake128,
+}, {
+  .name = "shake256",
+  .size = 32,
+  .func = shake256,
+}};
+
+#define USAGE "Usage: %s <algo> <data>\n" \
+              "\n" \
+              "Algorithms:\n" \
+              "- sha3-224\n" \
+              "- sha3-256\n" \
+              "- sha3-384\n" \
+              "- sha3-512\n" \
+              "- shake128\n" \
+              "- shake256\n" \
+              "\n" \
+              "Example:\n" \
+              "  %s sha3-256 \"asdf\"\n" \
+              "  dd2781f4c51bccdbe23e4d398b8a82261f585c278dbb4b84989fea70e76723a9\n"
+
+int main(int argc, char *argv[]) {
+  if (argc < 3) {
+    const char *app = (argc > 0) ? argv[0] : "sha3";
+    fprintf(stderr, USAGE, app, app);
+    return -1;
+  }
+
+  for (size_t i = 0; i < sizeof(fns)/sizeof(fns[0]); i++) {
+    if (strncmp(argv[1], fns[i].name, strlen(fns[i].name) + 1)) {
+      continue;
+    }
+
+    // hash into buf
+    uint8_t buf[64];
+    fns[i].func((uint8_t*) argv[2], strlen(argv[2]), buf);
+
+    // print result
+    for (size_t j = 0; j < fns[i].size; j++) {
+      printf("%02x", buf[j]);
+    }
+    fputs("\n", stdout);
+
+    // exit with success
+    return 0;
+  }
+
+  fprintf(stderr, "Unknown algorithm: %s", argv[1]);
+  return -1;
+}
-- 
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