1 files changed, 89 insertions, 0 deletions
diff --git a/utils/aes128ecb_decrypt_file.cpp b/utils/aes128ecb_decrypt_file.cpp
new file mode 100644
index 0000000..a6757d4
--- /dev/null
+++ b/utils/aes128ecb_decrypt_file.cpp
@@ -0,0 +1,89 @@
+/**
+ * \file
+ * \author Egor Tensin <Egor.Tensin@gmail.com>
+ * \date 2015
+ * \copyright This file is licensed under the terms of the MIT License.
+ *            See LICENSE.txt for details.
+ */
+
+extern "C"
+{
+#include <aesni/all.h>
+}
+
+#include <cstdio>
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+
+namespace
+{
+    void exit_with_usage()
+    {
+        std::cout << "Usage: aes128ecb_encrypt_file.exe KEY SRC DEST\n";
+        std::exit(EXIT_FAILURE);
+    }
+
+    std::ifstream::pos_type get_file_size(const std::string& path)
+    {
+        std::ifstream ifs(path, std::ifstream::binary | std::ifstream::ate);
+        return ifs.tellg();
+    }
+}
+
+int main(int argc, char** argv)
+{
+    AesBlock128 key;
+    Aes128KeySchedule key_schedule, inverted_schedule;
+
+    if (argc != 4)
+        exit_with_usage();
+
+    if (parse_aes_block128(&key, argv[1]) != 0)
+    {
+        std::cerr << "Invalid 128-bit AES block '" << argv[1] << "'\n";
+        exit_with_usage();
+    }
+
+    try
+    {
+        const std::string src_path(argv[2]);
+        const std::string dest_path(argv[3]);
+
+        const auto src_size = get_file_size(src_path);
+
+        std::ifstream src_ifs;
+        src_ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
+        src_ifs.open(src_path, std::ifstream::binary);
+
+        std::vector<unsigned char> src_buf;
+        src_buf.reserve(static_cast<std::vector<char>::size_type>(src_size));
+        src_buf.assign(std::istreambuf_iterator<char>(src_ifs),
+                       std::istreambuf_iterator<char>());
+
+        aes128_expand_key_schedule(key, &key_schedule);
+        aes128_invert_key_schedule(&key_schedule, &inverted_schedule);
+
+        auto dest_size = aes128ecb_decrypt_file(
+            src_buf.data(), static_cast<std::size_t>(src_size), NULL, &inverted_schedule);
+
+        std::vector<unsigned char> dest_buf(static_cast<std::vector<char>::size_type>(dest_size));
+
+        dest_size = aes128ecb_decrypt_file(
+            src_buf.data(), static_cast<std::size_t>(src_size), dest_buf.data(), &inverted_schedule);
+
+        std::ofstream dest_ofs;
+        dest_ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
+        dest_ofs.open(dest_path, std::ofstream::binary);
+        dest_ofs.write(reinterpret_cast<const char*>(dest_buf.data()), dest_size);
+    }
+    catch (const std::exception& e)
+    {
+        std::cerr << e.what() << "\n";
+        return 1;
+    }
+
+    return 0;
+}