void srp_user_process_meteor_challenge(SRPUser *usr,
const char *password,
const char *salt,
const char *identity,
const char *Bstr,
const char **Mstr) {
unsigned char buff[SHA256_DIGEST_LENGTH];
BN_CTX *ctx = BN_CTX_new();
BIGNUM *u = BN_new();
BIGNUM *x = BN_new();
BIGNUM *k = BN_new();
BIGNUM *kgx = BN_new();
BIGNUM *aux = BN_new();
meteor_user_generate_u(usr, Bstr, buff, &u);
meteor_user_generate_x( usr, identity, salt, password, buff, &x );
meteor_user_generate_k( usr, buff, &k );
meteor_user_generate_kgx( usr, ctx, x, k, &kgx );
meteor_user_generate_aux( usr, ctx, u, x, &aux );
char * S_str;
meteor_user_generate_S_string(usr, ctx, kgx, aux, Bstr, &S_str);
*Mstr = meteor_user_generate_M_string(usr, S_str, buff, Bstr);
meteor_user_generate_HAMK( usr, buff, *Mstr, S_str );
BN_free(u);
BN_free(x);
BN_free(k);
BN_free(kgx);
BN_free(aux);
}
void srp_user_process_meteor_challenge( struct SRPUser * usr,
const char * password,
const char * salt,
const char * identity,
const char * Bstr,
const char ** Mstr )
{
unsigned char buff[ SHA256_DIGEST_LENGTH ];
BN_CTX *ctx = BN_CTX_new();
BIGNUM *u = BN_new();
BIGNUM *x = BN_new();
BIGNUM *k = BN_new();
BIGNUM *kgx = BN_new();
BIGNUM *aux = BN_new();
if( !salt || !identity || !Bstr || !Mstr || !ctx )
goto cleanup_and_exit;
meteor_user_generate_u(usr, Bstr, buff, &u);
if( !u )
goto cleanup_and_exit;
meteor_user_generate_x( usr, identity, salt, password, buff, &x );
if( !x )
goto cleanup_and_exit;
meteor_user_generate_k( usr, buff, &k );
if( !k )
goto cleanup_and_exit;
meteor_user_generate_kgx( usr, ctx, x, k, &kgx );
if ( !kgx )
goto cleanup_and_exit;
meteor_user_generate_aux( usr, ctx, u, x, &aux );
if ( !aux )
goto cleanup_and_exit;
char * S_str;
meteor_user_generate_S_string( usr, ctx, kgx, aux, Bstr, &S_str );
if ( !S_str )
goto cleanup_and_exit;
char * M_str;
meteor_user_generate_M_string( usr, S_str, buff, Bstr, &M_str );
*Mstr = M_str;
// calculate and store HAMK for verfication later
meteor_user_generate_HAMK( usr, buff, M_str, S_str );
cleanup_and_exit:
BN_free(u);
BN_free(x);
BN_free(k);
BN_free(kgx);
BN_CTX_free(ctx);
}