1 files changed, 75 insertions, 0 deletions
diff --git a/utils/block/aes192ofb_decrypt_block.c b/utils/block/aes192ofb_decrypt_block.c
new file mode 100644
index 0000000..eaa9d2a
--- /dev/null
+++ b/utils/block/aes192ofb_decrypt_block.c
@@ -0,0 +1,75 @@
+/**
+ * \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: aes192ofb_decrypt_block.exe KEY0 IV0 [CIPHERTEXT0...] [-- KEY1 IV1 [CIPHERTEXT1...]...]");
+    exit(EXIT_FAILURE);
+}
+
+static void print_error(AesNI_StatusCode status)
+{
+    fprintf(stderr, "AesNI error: %s\n", aesni_strerror(status));
+}
+
+int main(int argc, char** argv)
+{
+    AesNI_StatusCode status = AESNI_SUCCESS;
+
+    for (--argc, ++argv; argc > -1; --argc, ++argv)
+    {
+        AesNI_Block128 plaintext, ciphertext, iv;
+        AesNI_Aes192_Key key;
+        AesNI_Aes192_RoundKeys encryption_keys;
+
+        if (argc < 2)
+            exit_with_usage();
+
+        if (aesni_is_error(status = aesni_aes192_parse_key(&key, *argv, NULL)))
+        {
+            print_error(status);
+            exit_with_usage();
+        }
+
+        if (aesni_is_error(status = aesni_aes_parse_block(&iv, argv[1], NULL)))
+        {
+            print_error(status);
+            exit_with_usage();
+        }
+
+        aesni_aes192_expand_key(&key, &encryption_keys);
+
+        for (argc -= 2, argv += 2; argc > 0; --argc, ++argv)
+        {
+            if (strcmp("--", *argv) == 0)
+                break;
+
+            if (aesni_is_error(status = aesni_aes_parse_block(&ciphertext, *argv, NULL)))
+            {
+                print_error(status);
+                continue;
+            }
+
+            plaintext = aesni_aes192_decrypt_block_ofb(ciphertext, &encryption_keys, iv, &iv);
+
+            if (aesni_is_error(status = aesni_aes_print_block(&plaintext, NULL)))
+            {
+                print_error(status);
+                continue;
+            }
+        }
+    }
+
+    return 0;
+}