1 files changed, 109 insertions, 0 deletions
diff --git a/lib/pk_pad/eme.h b/lib/pk_pad/eme.h
new file mode 100644
index 000000000..358b4f144
--- /dev/null
+++ b/lib/pk_pad/eme.h
@@ -0,0 +1,109 @@
+/*
+* EME Classes
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_PUBKEY_EME_ENCRYPTION_PAD_H__
+#define BOTAN_PUBKEY_EME_ENCRYPTION_PAD_H__
+
+#include <botan/secmem.h>
+#include <botan/rng.h>
+
+namespace Botan {
+
+/**
+* Encoding Method for Encryption
+*/
+class BOTAN_DLL EME
+   {
+   public:
+      /**
+      * Return the maximum input size in bytes we can support
+      * @param keybits the size of the key in bits
+      * @return upper bound of input in bytes
+      */
+      virtual size_t maximum_input_size(size_t keybits) const = 0;
+
+      /**
+      * Encode an input
+      * @param in the plaintext
+      * @param in_length length of plaintext in bytes
+      * @param key_length length of the key in bits
+      * @param rng a random number generator
+      * @return encoded plaintext
+      */
+      secure_vector<byte> encode(const byte in[],
+                                size_t in_length,
+                                size_t key_length,
+                                RandomNumberGenerator& rng) const;
+
+      /**
+      * Encode an input
+      * @param in the plaintext
+      * @param key_length length of the key in bits
+      * @param rng a random number generator
+      * @return encoded plaintext
+      */
+      secure_vector<byte> encode(const secure_vector<byte>& in,
+                                size_t key_length,
+                                RandomNumberGenerator& rng) const;
+
+      /**
+      * Decode an input
+      * @param in the encoded plaintext
+      * @param in_length length of encoded plaintext in bytes
+      * @param key_length length of the key in bits
+      * @return plaintext
+      */
+      secure_vector<byte> decode(const byte in[],
+                                size_t in_length,
+                                size_t key_length) const;
+
+      /**
+      * Decode an input
+      * @param in the encoded plaintext
+      * @param key_length length of the key in bits
+      * @return plaintext
+      */
+      secure_vector<byte> decode(const secure_vector<byte>& in,
+                                size_t key_length) const;
+
+      virtual ~EME() {}
+   private:
+      /**
+      * Encode an input
+      * @param in the plaintext
+      * @param in_length length of plaintext in bytes
+      * @param key_length length of the key in bits
+      * @param rng a random number generator
+      * @return encoded plaintext
+      */
+      virtual secure_vector<byte> pad(const byte in[],
+                                     size_t in_length,
+                                     size_t key_length,
+                                     RandomNumberGenerator& rng) const = 0;
+
+      /**
+      * Decode an input
+      * @param in the encoded plaintext
+      * @param in_length length of encoded plaintext in bytes
+      * @param key_length length of the key in bits
+      * @return plaintext
+      */
+      virtual secure_vector<byte> unpad(const byte in[],
+                                       size_t in_length,
+                                       size_t key_length) const = 0;
+   };
+
+/**
+* Factory method for EME (message-encoding methods for encryption) objects
+* @param algo_spec the name of the EME to create
+* @return pointer to newly allocated object of that type
+*/
+BOTAN_DLL EME*  get_eme(const std::string& algo_spec);
+
+}
+
+#endif