/* * 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