From 2a2c19be3743c27f65656509e7aceb580705ab6b Mon Sep 17 00:00:00 2001
From: Dimitri Lozeve <dimitri@lozeve.com>
Date: Tue, 2 Jun 2020 21:19:41 +0200
Subject: [PATCH] Solve challenge 2

---
 ex02/main.c | 29 +++++++++++++++++++++++++++++
 meson.build |  1 +
 2 files changed, 30 insertions(+)
 create mode 100644 ex02/main.c

diff --git a/ex02/main.c b/ex02/main.c
new file mode 100644
index 0000000..9bffe7e
--- /dev/null
+++ b/ex02/main.c
@@ -0,0 +1,29 @@
+#include "utils.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+  if (argc < 3) {
+    printf("Usage: %s <hex1> <hex2>\n", argv[0]);
+    return EXIT_FAILURE;
+  }
+
+  unsigned char buf1[512] = {0};
+  size_t len1 = hex_to_bytes(buf1, argv[1]);
+  unsigned char buf2[512] = {0};
+  size_t len2 = hex_to_bytes(buf2, argv[2]);
+
+  if (len1 != len2) {
+    printf("Different lengths!\n");
+    return EXIT_FAILURE;
+  }
+
+  for (size_t i = 0; i < len1; ++i) {
+    unsigned char c = buf2[i] ^ buf1[i];
+    printf("%x", c);
+  }
+  printf("\n");
+
+  return EXIT_SUCCESS;
+}
diff --git a/meson.build b/meson.build
index a3a0376..2a1ef2b 100644
--- a/meson.build
+++ b/meson.build
@@ -1,3 +1,4 @@
 project('cryptopals', 'c')
 
 executable('ex01', ['ex01/main.c', 'utils.c'])
+executable('ex02', ['ex02/main.c', 'utils.c'])