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/*
* Implement J-PAKE, as described in
* http://grouper.ieee.org/groups/1363/Research/contributions/hao-ryan-2008.pdf
*
* With hints from http://www.cl.cam.ac.uk/~fh240/software/JPAKE2.java.
*/
#ifndef HEADER_JPAKE_H
#define HEADER_JPAKE_H
#include <openssl/opensslconf.h>
#ifdef OPENSSL_NO_JPAKE
#error JPAKE is disabled.
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include <openssl/bn.h>
#include <openssl/sha.h>
typedef struct JPAKE_CTX JPAKE_CTX;
/* Note that "g" in the ZKPs is not necessarily the J-PAKE g. */
typedef struct
{
BIGNUM *gr; /* g^r (r random) */
BIGNUM *b; /* b = r - x*h, h=hash(g, g^r, g^x, name) */
} JPAKE_ZKP;
typedef struct
{
BIGNUM *gx; /* g^x in step 1, g^(xa + xc + xd) * xb * s in step 2 */
JPAKE_ZKP zkpx; /* ZKP(x) or ZKP(xb * s) */
} JPAKE_STEP_PART;
typedef struct
{
JPAKE_STEP_PART p1; /* g^x3, ZKP(x3) or g^x1, ZKP(x1) */
JPAKE_STEP_PART p2; /* g^x4, ZKP(x4) or g^x2, ZKP(x2) */
} JPAKE_STEP1;
typedef JPAKE_STEP_PART JPAKE_STEP2;
typedef struct
{
unsigned char hhk[SHA_DIGEST_LENGTH];
} JPAKE_STEP3A;
typedef struct
{
unsigned char hk[SHA_DIGEST_LENGTH];
} JPAKE_STEP3B;
/* Parameters are copied */
JPAKE_CTX *JPAKE_CTX_new(const char *name, const char *peer_name,
const BIGNUM *p, const BIGNUM *g, const BIGNUM *q,
const BIGNUM *secret);
void JPAKE_CTX_free(JPAKE_CTX *ctx);
/*
* Note that JPAKE_STEP1 can be used multiple times before release
* without another init.
*/
void JPAKE_STEP1_init(JPAKE_STEP1 *s1);
int JPAKE_STEP1_generate(JPAKE_STEP1 *send, JPAKE_CTX *ctx);
int JPAKE_STEP1_process(JPAKE_CTX *ctx, const JPAKE_STEP1 *received);
void JPAKE_STEP1_release(JPAKE_STEP1 *s1);
/*
* Note that JPAKE_STEP2 can be used multiple times before release
* without another init.
*/
void JPAKE_STEP2_init(JPAKE_STEP2 *s2);
int JPAKE_STEP2_generate(JPAKE_STEP2 *send, JPAKE_CTX *ctx);
int JPAKE_STEP2_process(JPAKE_CTX *ctx, const JPAKE_STEP2 *received);
void JPAKE_STEP2_release(JPAKE_STEP2 *s2);
/*
* Optionally verify the shared key. If the shared secrets do not
* match, the two ends will disagree about the shared key, but
* otherwise the protocol will succeed.
*/
void JPAKE_STEP3A_init(JPAKE_STEP3A *s3a);
int JPAKE_STEP3A_generate(JPAKE_STEP3A *send, JPAKE_CTX *ctx);
int JPAKE_STEP3A_process(JPAKE_CTX *ctx, const JPAKE_STEP3A *received);
void JPAKE_STEP3A_release(JPAKE_STEP3A *s3a);
void JPAKE_STEP3B_init(JPAKE_STEP3B *s3b);
int JPAKE_STEP3B_generate(JPAKE_STEP3B *send, JPAKE_CTX *ctx);
int JPAKE_STEP3B_process(JPAKE_CTX *ctx, const JPAKE_STEP3B *received);
void JPAKE_STEP3B_release(JPAKE_STEP3B *s3b);
/*
* the return value belongs to the library and will be released when
* ctx is released, and will change when a new handshake is performed.
*/
const BIGNUM *JPAKE_get_shared_key(JPAKE_CTX *ctx);
/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
* made after this point may be overwritten when the script is next run.
*/
void ERR_load_JPAKE_strings(void);
/* Error codes for the JPAKE functions. */
/* Function codes. */
#define JPAKE_F_JPAKE_STEP1_PROCESS 101
#define JPAKE_F_JPAKE_STEP2_PROCESS 102
#define JPAKE_F_JPAKE_STEP3A_PROCESS 103
#define JPAKE_F_JPAKE_STEP3B_PROCESS 104
#define JPAKE_F_VERIFY_ZKP 100
/* Reason codes. */
#define JPAKE_R_G_TO_THE_X4_IS_ONE 105
#define JPAKE_R_HASH_OF_HASH_OF_KEY_MISMATCH 106
#define JPAKE_R_HASH_OF_KEY_MISMATCH 107
#define JPAKE_R_VERIFY_B_FAILED 102
#define JPAKE_R_VERIFY_X3_FAILED 103
#define JPAKE_R_VERIFY_X4_FAILED 104
#define JPAKE_R_ZKP_VERIFY_FAILED 100
#ifdef __cplusplus
}
#endif
#endif
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