6 files changed, 44 insertions, 12 deletions
diff --git a/src/modes/aead/aead.h b/src/modes/aead/aead.h
index 97f156d60..25958a36a 100644
--- a/src/modes/aead/aead.h
+++ b/src/modes/aead/aead.h
@@ -8,7 +8,7 @@
 #ifndef BOTAN_AEAD_MODE_H__
 #define BOTAN_AEAD_MODE_H__
 
-#include <botan/transform.h>
+#include <botan/cipher_mode.h>
 
 namespace Botan {
 
@@ -19,9 +19,11 @@ namespace Botan {
 * which is not included in the ciphertext (for instance a sequence
 * number).
 */
-class AEAD_Mode : public Transformation
+class BOTAN_DLL AEAD_Mode : public Cipher_Mode
    {
    public:
+      bool authenticated() const override { return true; }
+
       /**
       * Set associated data that is not included in the ciphertext but
       * that should be authenticated. Must be called after set_key
@@ -44,7 +46,7 @@ class AEAD_Mode : public Transformation
 
       /**
       * Default AEAD nonce size (a commonly supported value among AEAD
-      * modes, and, large enough that random collisions are unlikely).
+      * modes, and large enough that random collisions are unlikely).
       */
       size_t default_nonce_size() const override { return 12; }
    };
diff --git a/src/modes/cbc/cbc.h b/src/modes/cbc/cbc.h
index 68a1f7bcd..8638c8a05 100644
--- a/src/modes/cbc/cbc.h
+++ b/src/modes/cbc/cbc.h
@@ -8,7 +8,7 @@
 #ifndef BOTAN_MODE_CBC_H__
 #define BOTAN_MODE_CBC_H__
 
-#include <botan/transform.h>
+#include <botan/cipher_mode.h>
 #include <botan/block_cipher.h>
 #include <botan/mode_pad.h>
 #include <memory>
@@ -18,7 +18,7 @@ namespace Botan {
 /**
 * CBC Mode
 */
-class CBC_Mode : public Transformation
+class BOTAN_DLL CBC_Mode : public Cipher_Mode
    {
    public:
       secure_vector<byte> start(const byte nonce[], size_t nonce_len) override;
diff --git a/src/modes/cfb/cfb.h b/src/modes/cfb/cfb.h
index 19e5b4bb0..46b1997d2 100644
--- a/src/modes/cfb/cfb.h
+++ b/src/modes/cfb/cfb.h
@@ -8,7 +8,7 @@
 #ifndef BOTAN_MODE_CFB_H__
 #define BOTAN_MODE_CFB_H__
 
-#include <botan/transform.h>
+#include <botan/cipher_mode.h>
 #include <botan/block_cipher.h>
 #include <botan/mode_pad.h>
 #include <memory>
@@ -18,7 +18,7 @@ namespace Botan {
 /**
 * CFB Mode
 */
-class CFB_Mode : public Transformation
+class BOTAN_DLL CFB_Mode : public Cipher_Mode
    {
    public:
       secure_vector<byte> start(const byte nonce[], size_t nonce_len) override;
diff --git a/src/modes/cipher_mode.h b/src/modes/cipher_mode.h
new file mode 100644
index 000000000..91e2af5a9
--- /dev/null
+++ b/src/modes/cipher_mode.h
@@ -0,0 +1,30 @@
+/*
+* Cipher Modes
+* (C) 2013 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_CIPHER_MODE_H__
+#define BOTAN_CIPHER_MODE_H__
+
+#include <botan/transform.h>
+
+namespace Botan {
+
+/**
+* Interface for cipher modes
+*/
+class BOTAN_DLL Cipher_Mode : public Transformation
+   {
+   public:
+      /**
+      * Returns true iff this mode provides authentication as well as
+      * confidentiality.
+      */
+      virtual bool authenticated() const { return false; }
+   };
+
+}
+
+#endif
diff --git a/src/modes/ecb/ecb.h b/src/modes/ecb/ecb.h
index 459ac939a..8ab62fa45 100644
--- a/src/modes/ecb/ecb.h
+++ b/src/modes/ecb/ecb.h
@@ -8,7 +8,7 @@
 #ifndef BOTAN_MODE_ECB_H__
 #define BOTAN_MODE_ECB_H__
 
-#include <botan/transform.h>
+#include <botan/cipher_mode.h>
 #include <botan/block_cipher.h>
 #include <botan/mode_pad.h>
 #include <memory>
@@ -16,9 +16,9 @@
 namespace Botan {
 
 /**
-* ECB Mode. Only handles full blocks, padding is handled higher up
+* ECB mode
 */
-class ECB_Mode : public Transformation
+class BOTAN_DLL ECB_Mode : public Cipher_Mode
    {
    public:
       secure_vector<byte> start(const byte nonce[], size_t nonce_len) override;
diff --git a/src/modes/xts/xts.h b/src/modes/xts/xts.h
index 0aea3293d..a1f0f1626 100644
--- a/src/modes/xts/xts.h
+++ b/src/modes/xts/xts.h
@@ -8,7 +8,7 @@
 #ifndef BOTAN_MODE_XTS_H__
 #define BOTAN_MODE_XTS_H__
 
-#include <botan/transform.h>
+#include <botan/cipher_mode.h>
 #include <botan/block_cipher.h>
 #include <memory>
 
@@ -17,7 +17,7 @@ namespace Botan {
 /**
 * IEEE P1619 XTS Mode
 */
-class XTS_Mode : public Transformation
+class BOTAN_DLL XTS_Mode : public Cipher_Mode
    {
    public:
       std::string name() const override;