SM2国密标准

static int sm2_sign_setup(EC_KEY *eckey, BN_CTX *ctx_in, BIGNUM **kp, BIGNUM **rp) { BN_CTX *ctx = NULL; BIGNUM *k = NULL, *r = NULL, *order = NULL, *X = NULL; EC_POINT *tmp_point=NULL; const EC_GROUP *group; int ret = 0; if (eckey == NULL || (group = EC_KEY_get0_group(eckey)) == NULL) { ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_PASSED_NULL_PARAMETER); return 0; } if (ctx_in == NULL) { if ((ctx = BN_CTX_new()) == NULL) { ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP,ERR_R_MALLOC_FAILURE); return 0; } } else ctx = ctx_in; k = BN_new(); /* this value is later returned in *kp */ r = BN_new(); /* this value is later returned in *rp */ order = BN_new(); X = BN_new(); if (!k || !r || !order || !X) { ECDSAerr(ECDSA_F_ECDSA_SIGN_SETUP, ERR_R_MALLOC_FAILURE); goto err; }