3 files changed, 61 insertions, 4 deletions
diff --git a/include/aesni/all.h b/include/aesni/all.h
index 1360320..4653eca 100644
--- a/include/aesni/all.h
+++ b/include/aesni/all.h
@@ -11,4 +11,5 @@
 #include "block.h"
 #include "buffer.h"
 #include "data.h"
+#include "error.h"
 #include "raw.h"
diff --git a/include/aesni/buffer.h b/include/aesni/buffer.h
index daafc3e..13f19da 100644
--- a/include/aesni/buffer.h
+++ b/include/aesni/buffer.h
@@ -8,6 +8,8 @@
 
 #pragma once
 
+#include "error.h"
+
 #include <stdlib.h>
 
 #ifdef __cplusplus
@@ -15,16 +17,20 @@ extern "C"
 {
 #endif
 
-size_t aesni_encrypt_buffer_ecb128(
+int aesni_encrypt_buffer_ecb128(
     const void* src,
     size_t src_size,
     void* dest,
-    AesNI_KeySchedule128* key_schedule);
-size_t aesni_decrypt_buffer_ecb128(
+    size_t* dest_size,
+    AesNI_KeySchedule128* key_schedule,
+    AesNI_ErrorDetails*);
+int aesni_decrypt_buffer_ecb128(
     const void* src,
     size_t src_size,
     void* dest,
-    AesNI_KeySchedule128* inverted_schedule);
+    size_t* dest_size,
+    AesNI_KeySchedule128* inverted_schedule,
+    AesNI_ErrorDetails*);
 
 #ifdef __cplusplus
 }
diff --git a/include/aesni/error.h b/include/aesni/error.h
new file mode 100644
index 0000000..54d3d34
--- /dev/null
+++ b/include/aesni/error.h
@@ -0,0 +1,50 @@
+/**
+ * \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
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+typedef enum
+{
+    AESNI_ERROR_SUCCESS,
+
+    AESNI_ERROR_NULL_ARGUMENT,
+
+    AESNI_ERROR_INVALID_PKCS7_PADDING,
+}
+AesNI_ErrorCode;
+
+const char* aesni_strerror(AesNI_ErrorCode);
+
+typedef struct
+{
+    AesNI_ErrorCode ec;
+
+    union
+    {
+        struct
+        {
+            char arg_name[32];
+        }
+        null_arg;
+    }
+    params;
+}
+AesNI_ErrorDetails;
+
+void aesni_make_error_success(AesNI_ErrorDetails*);
+void aesni_make_error_null_argument(AesNI_ErrorDetails*, const char* arg_name);
+void aesni_make_error_invalid_pkcs7_padding(AesNI_ErrorDetails*);
+
+#ifdef __cplusplus
+}
+#endif