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/*
* PK Operation Types
* (C) 2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_PK_OPERATIONS_H__
#define BOTAN_PK_OPERATIONS_H__
#include <botan/secmem.h>
#include <botan/rng.h>
namespace Botan {
namespace PK_Ops {
class BOTAN_DLL Encryption
{
public:
virtual SecureVector<byte> encrypt(const byte msg[], u32bit msg_len,
RandomNumberGenerator& rng) const = 0;
virtual ~Encryption() {}
};
class BOTAN_DLL Signature
{
public:
/**
* Find out the number of message parts supported by this scheme.
* @return the number of message parts
*/
virtual u32bit message_parts() const { return 1; }
/**
* Find out the message part size supported by this scheme/key.
* @return the size of the message parts
*/
virtual u32bit message_part_size() const { return 0; }
/**
* Get the maximum message size in bits supported by this public key.
* @return the maximum message in bits
*/
virtual u32bit max_input_bits() const = 0;
/*
* Perform a signature operation
* @param msg the message
* @param msg_len the length of msg in bytes
* @param rng a random number generator
*/
virtual SecureVector<byte>
sign(const byte msg[], u32bit msg_len,
RandomNumberGenerator& rng) const = 0;
virtual ~Signature() {}
};
class BOTAN_DLL Verification
{
public:
/**
* Get the maximum message size in bits supported by this public key.
* @return the maximum message in bits
*/
virtual u32bit max_input_bits() const = 0;
/**
* Find out the number of message parts supported by this scheme.
* @return the number of message parts
*/
virtual u32bit message_parts() const { return 1; }
/**
* Find out the message part size supported by this scheme/key.
* @return the size of the message parts
*/
virtual u32bit message_part_size() const { return 0; }
/**
* @return boolean specifying if this key type supports message
* recovery and thus if you need to call verify() or verify_mr()
*/
virtual bool with_recovery() const = 0;
/*
* Perform a signature check operation
* @param msg the message
* @param msg_len the length of msg in bytes
* @param sig the signature
* @param sig_len the length of sig in bytes
* @returns if signature is a valid one for message
*/
virtual bool verify(const byte msg[], u32bit msg_len,
const byte sig[], u32bit sig_len) const
{
throw Invalid_State("Message recovery required");
}
/*
* Perform a signature operation (with message recovery)
* Only call this if with_recovery() returns true
* @param msg the message
* @param msg_len the length of msg in bytes
* @returns recovered message
*/
virtual SecureVector<byte> verify_mr(const byte msg[],
u32bit msg_len) const
{
throw Invalid_State("Message recovery not supported");
}
virtual ~Verification() {}
};
/*
* A generic Key Agreement Operation (eg DH or ECDH)
*/
class BOTAN_DLL Key_Agreement
{
public:
/*
* Perform a key agreement operation
* @param w the other key value
* @param w_len the length of w in bytes
* @returns the agreed key
*/
virtual SecureVector<byte> agree(const byte w[], u32bit w_len) const = 0;
virtual ~Key_Agreement() {}
};
}
}
#endif
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