/*
**
** Krishna Puttaswamy: created on 21st May 2006
** description: My collection of functions to help in performing cryptographic operations
*/

#ifndef _MYCRYPTO_H_
#define _MYCRYPTO_H_
#include "chimera.h"

#define RAND_SEED_LENGTH 16
#define SYMMETRIC_KEY_LENGTH 16
#define IV_LENGTH 16
// This is the symmetric encryption by default for this project 
#define SYMMETRIC_CYPHER_TYPE "bf-ecb"

#ifdef __cplusplus
extern "C" {
#endif

// These are for symmetric key encryption
void get_data_from_random_file (unsigned char *data, int length);
void print_in_hex (unsigned char *data, int length);
unsigned char *symmetric_encrypt (unsigned char *data, int inputlen,
				  unsigned char *key, int keylen,
				  unsigned char *iv, int ivlen, int *outlen);
unsigned char *symmetric_decrypt (ChimeraState *state, unsigned char *data, int inputlen,
				  unsigned char *key, int keylen,
				  unsigned char *iv, int ivlen, int *outlen);
void generate_symmetric_key (unsigned char *key, int keylen,
			     unsigned char *iv, int ivlen);

// There are for asymmetric key encryption
EVP_PKEY *ReadPublicKey (const char *certfile);
EVP_PKEY *ReadPrivateKey (const char *keyfile);
// there is no need to generate the asymmetric keys unlike symmetric keys because they are obtained from the CA
unsigned char *rsa_decrypt (unsigned char *data, int inputlen,
			    char *privKeyFile, int *outlen);
unsigned char *rsa_encrypt (unsigned char *data, int inputlen,
			    char *pubKeyFile, int *outlen);

#ifdef __cplusplus
} 
#endif
#endif /* _MYCRYPTO_H_ */