/*
** Author: Krishna Puttaswamy
** description: the header file with some definition to use in the operation of the CA
*/

#ifndef _CA_H_
#define _CA_H_
#include "key.h"
#include "chimera.h"

#define MAXPREFIXLENGTH  (KEY_SIZE/BASE_B + 1)	// same as the length of the key
#define RSAKEYLENGTH  2049	// length depends on the number of bits specified during key generation.  1 byte extra
#define TOTALNUMBEROFKEYS 9000	// For now, might need to change this later
#define Debug(d, fmt, args...) (d==1 ? printf(fmt, ##args) : 0)
#define DEBUGLEVEL 1
#define true  1
#define false 0

#ifdef __cplusplus
extern "C" {
#else
typedef int bool;		// This is one way of abstracting boolean in C
#endif

typedef enum KeyType
{
    NONE = -1,			// This is used to avoid initial value being 0 by default
    PRIVATEKEY = 0,
    PUBLICKEY
} KeyType;
typedef enum ReplyError
{
    NOERROR = 0,
    PREFIXNOTINKEY,		// if the source doenst contain the key
    PRIVATEKEYNOTFOUND,		// For the given prefix if a request is made for a public key and there is no corresponding priv key
    OUTOFKEYS			// this can happen when all precomputed keys are usedup. we will need to start the porgram to generate more keys
} ReplyError;			// This struct contains the error code for the reply from the server

// Structure for requesting key from the central authority
typedef struct KeyRequest
{
    KeyType type;		// Specify if the request is for the priv key or pub key
    char prefix[MAXPREFIXLENGTH];	// Prefix for which the request is sent
    char nodeid[MAXPREFIXLENGTH];	// This is the key of the key requestor
} KeyRequest;

// Structure for sending back the reply to the node from the CA
typedef struct KeyReply
{
    ReplyError error;
    char key[RSAKEYLENGTH];	// Send back the key
} KeyReply;


unsigned char *public_encrypt_data_with_key (ChimeraState * state,
					     char *nodeid, char *prefix,
					     unsigned char *input,
					     int inputlen, int *outlen);
unsigned char *private_decrypt_data_with_key (ChimeraState * state,
					      char *nodeid, char *prefix,
					      unsigned char *input,
					      int inputlen, int *outlen);
#ifdef __cplusplus
} 
#endif
#endif /* end _CA_H_ */