boxes: a number of improvements

* Algorithm interfaces are no longer required to load partial blocks,
the space for which is allocated dynamically.
* Padding schemes are now also separated, perhaps in the future to
become a "box" parameter.
Consequently, algorithm interfaces are no longer required to implement
padding either.

1 files changed, 32 insertions, 0 deletions

diff --git a/include/aesni/padding.h b/include/aesni/padding.h
new file mode 100644
index 0000000..f76df16
--- /dev/null
+++ b/include/aesni/padding.h
@@ -0,0 +1,32 @@
+/**
+ * \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.
+ */
+
+#pragma once
+
+#include "error.h"
+
+#include <stdlib.h>
+
+typedef enum
+{
+    AESNI_PADDING_PKCS7,
+}
+AesNI_PaddingMethod;
+
+AesNI_StatusCode aesni_extract_padding_size(
+    AesNI_PaddingMethod,
+    const void* src,
+    size_t src_size,
+    size_t* padding_size,
+    AesNI_ErrorDetails*);
+
+AesNI_StatusCode aesni_fill_with_padding(
+    AesNI_PaddingMethod,
+    void* dest,
+    size_t padding_size,
+    AesNI_ErrorDetails*);