version3/cpp/ecdh_support.h

#ifndef ECC_SUPPORT_H
#define ECC_SUPPORT_H

#include "amcl.h"

namespace amcl {

/* Auxiliary Functions */


extern void ehashit(int ,octet *,int ,octet *,octet *,int);

/**	@brief hash an octet into another octet
 *
 	@param h is the hash type
	@param I input octet
	@param O output octet - H(I)
 */
extern void HASH(int h,octet *I,octet *O);
/**	@brief HMAC of message M using key K to create tag of length len in octet tag
 *
	IEEE-1363 MAC1 function. Uses SHA256 internally.
	@param h is the hash type
	@param M input message octet
	@param K input encryption key
	@param len is output desired length of HMAC tag
	@param tag is the output HMAC
	@return 0 for bad parameters, else 1
 */
extern int HMAC(int h,octet *M,octet *K,int len,octet *tag);

/*extern void KDF1(octet *,int,octet *);*/

/**	@brief Key Derivation Function - generates key K from inputs Z and P
 *
	IEEE-1363 KDF2 Key Derivation Function. Uses SHA256 internally.
	@param h is the hash type
	@param Z input octet
	@param P input key derivation parameters - can be NULL
	@param len is output desired length of key
	@param K is the derived key
 */
extern void KDF2(int h,octet *Z,octet *P,int len,octet *K);
/**	@brief Password Based Key Derivation Function - generates key K from password, salt and repeat counter
 *
	PBKDF2 Password Based Key Derivation Function. Uses SHA256 internally.
	@param h is the hash type
	@param P input password
	@param S input salt
	@param rep Number of times to be iterated.
	@param len is output desired length
	@param K is the derived key
 */
extern void PBKDF2(int h,octet *P,octet *S,int rep,int len,octet *K);
/**	@brief AES encrypts a plaintext to a ciphtertext
 *
	IEEE-1363 AES_CBC_IV0_ENCRYPT function. Encrypts in CBC mode with a zero IV, padding as necessary to create a full final block.
	@param K AES key
	@param P input plaintext octet
	@param C output ciphertext octet
 */
extern void AES_CBC_IV0_ENCRYPT(octet *K,octet *P,octet *C);
/**	@brief AES encrypts a plaintext to a ciphtertext
 *
	IEEE-1363 AES_CBC_IV0_DECRYPT function. Decrypts in CBC mode with a zero IV.
	@param K AES key
	@param C input ciphertext octet
	@param P output plaintext octet
	@return 0 if bad input, else 1
 */
extern int AES_CBC_IV0_DECRYPT(octet *K,octet *C,octet *P);

/* ECDH primitives - support functions */
/**	@brief Generate an ECC public/private key pair
 *
	@param R is a pointer to a cryptographically secure random number generator
	@param s the private key, an output internally randomly generated if R!=NULL, otherwise must be provided as an input
	@param W the output public key, which is s.G, where G is a fixed generator
	@return 0 or an error code
 */

}

 #endif