1 files changed, 62 insertions, 0 deletions
diff --git a/test/aes256ofb_decrypt_block.c b/test/aes256ofb_decrypt_block.c
new file mode 100644
index 0000000..9d4cc36
--- /dev/null
+++ b/test/aes256ofb_decrypt_block.c
@@ -0,0 +1,62 @@
+/**
+ * \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.
+ */
+
+#include <aesni/all.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void exit_with_usage()
+{
+    puts("Usage: aes256ofb_decrypt_block.exe KEY0 IV0 [CIPHERTEXT0...] [-- KEY1 IV1 [CIPHERTEXT1...]...]");
+    exit(EXIT_FAILURE);
+}
+
+int main(int argc, char** argv)
+{
+    for (--argc, ++argv; argc > -1; --argc, ++argv)
+    {
+        AesNI_Block128 plaintext, ciphertext, iv;
+        AesNI_Aes256_Key key;
+        AesNI_Aes256_RoundKeys encryption_keys;
+
+        if (argc < 2)
+            exit_with_usage();
+
+        if (aesni_is_error(aesni_aes256_parse_key(&key, *argv, NULL)))
+        {
+            fprintf(stderr, "Invalid 256-bit AES block '%s'\n", *argv);
+            exit_with_usage();
+        }
+
+        if (aesni_is_error(aesni_aes_parse_block(&iv, argv[1], NULL)))
+        {
+            fprintf(stderr, "Invalid 128-bit AES block '%s'\n", argv[1]);
+            exit_with_usage();
+        }
+
+        aesni_aes256_expand_key(&key, &encryption_keys);
+
+        for (argc -= 2, argv += 2; argc > 0; --argc, ++argv)
+        {
+            if (strcmp("--", *argv) == 0)
+                break;
+
+            if (aesni_is_error(aesni_aes_parse_block(&ciphertext, *argv, NULL)))
+            {
+                fprintf(stderr, "Invalid 128-bit AES block '%s'\n", *argv);
+                continue;
+            }
+            plaintext = aesni_aes256_decrypt_block_ofb(ciphertext, &encryption_keys, iv, &iv);
+            aesni_aes_print_block(&plaintext, NULL);
+        }
+    }
+
+    return 0;
+}