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/*
* 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 u32bit maximum_input_size(u32bit 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
*/
SecureVector<byte> encode(const byte in[],
u32bit in_length,
u32bit 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
*/
SecureVector<byte> encode(const MemoryRegion<byte>& in,
u32bit 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
*/
SecureVector<byte> decode(const byte in[],
u32bit in_length,
u32bit key_length) const;
/**
* Decode an input
* @param in the encoded plaintext
* @param key_length length of the key in bits
* @return plaintext
*/
SecureVector<byte> decode(const MemoryRegion<byte>& in,
u32bit 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 SecureVector<byte> pad(const byte in[],
u32bit in_length,
u32bit 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 SecureVector<byte> unpad(const byte in[],
u32bit in_length,
u32bit key_length) const = 0;
};
}
#endif
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