/*
 epoc1.h - EPOC-1 software specification

 Copyright NTT MCL, 2000.

 Duncan S Wong   
 Security Group, NTT MCL
 July 2000
*/


typedef unsigned char  BYTE;
typedef unsigned long  WORD;

#define MAX_PRIME_LEN            768
#define MAX_MODULUS_LEN          (MAX_PRIME_LEN*3)

#define TRUE                     1
#define FALSE                    0

#define MD_MD5                   1
#define MD_SHA                   2


/* EPOC-1 public and private key */
typedef struct {
	mpz_t n;
	mpz_t g;
	mpz_t h;
	BYTE Hid;
	WORD pLen;
	WORD mLen;
	WORD hLen;
	WORD rLen;
} EPOC1_PUB_KEY;


typedef struct {
	mpz_t p;
	mpz_t g_p;
} EPOC1_PRIV_KEY;


/* key-pair generation */
BYTE EPOC1_GenerateKeys (
	WORD           k,             /* desired key length */
	EPOC1_PUB_KEY  *publicKey,    /* new EPOC1 public key */
	EPOC1_PRIV_KEY *privateKey    /* new EPOC1 private key */
);


/* encryption */
BYTE EPOC1_Encryption (
	BYTE             *message,    /* plaintext */
	EPOC1_PUB_KEY    *publicKey,  /* EPOC1 public key */
	BYTE             *ciphertext  /* returned ciphertext */
);


/* decryption */
BYTE EPOC1_Decryption (
	BYTE             *ciphertext,
	EPOC1_PRIV_KEY   *privateKey,
	EPOC1_PUB_KEY    *publicKey,
	BYTE             *message
);


#define ABS(x) (x >= 0 ? x : -x)