+
+
+int ec_GFp_mont_group_init(EC_GROUP *group)
+ {
+ int ok;
+
+ ok = ec_GFp_simple_group_init(group);
+ group->field_data1 = NULL;
+ group->field_data2 = NULL;
+ return ok;
+ }
+
+
+void ec_GFp_mont_group_finish(EC_GROUP *group)
+ {
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+ ec_GFp_simple_group_finish(group);
+ }
+
+
+void ec_GFp_mont_group_clear_finish(EC_GROUP *group)
+ {
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_clear_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+ ec_GFp_simple_group_clear_finish(group);
+ }
+
+
+int ec_GFp_mont_group_copy(EC_GROUP *dest, const EC_GROUP *src)
+ {
+ if (dest->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(dest->field_data1);
+ dest->field_data1 = NULL;
+ }
+ if (dest->field_data2 != NULL)
+ {
+ BN_clear_free(dest->field_data2);
+ dest->field_data2 = NULL;
+ }
+
+ if (!ec_GFp_simple_group_copy(dest, src)) return 0;
+
+ if (src->field_data1 != NULL)
+ {
+ dest->field_data1 = BN_MONT_CTX_new();
+ if (dest->field_data1 == NULL) return 0;
+ if (!BN_MONT_CTX_copy(dest->field_data1, src->field_data1)) goto err;
+ }
+ if (src->field_data2 != NULL)
+ {
+ dest->field_data2 = BN_dup(src->field_data2);
+ if (dest->field_data2 == NULL) goto err;
+ }
+
+ return 1;
+
+ err:
+ if (dest->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(dest->field_data1);
+ dest->field_data1 = NULL;
+ }
+ return 0;
+ }
+
+
+int ec_GFp_mont_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+ {
+ BN_CTX *new_ctx = NULL;
+ BN_MONT_CTX *mont = NULL;
+ BIGNUM *one = NULL;
+ int ret = 0;
+
+ if (group->field_data1 != NULL)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ }
+ if (group->field_data2 != NULL)
+ {
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+
+ if (ctx == NULL)
+ {
+ ctx = new_ctx = BN_CTX_new();
+ if (ctx == NULL)
+ return 0;
+ }
+
+ mont = BN_MONT_CTX_new();
+ if (mont == NULL) goto err;
+ if (!BN_MONT_CTX_set(mont, p, ctx))
+ {
+ ECerr(EC_F_GFP_MONT_GROUP_SET_CURVE, ERR_R_BN_LIB);
+ goto err;
+ }
+ one = BN_new();
+ if (one == NULL) goto err;
+ if (!BN_to_montgomery(one, BN_value_one(), mont, ctx)) goto err;
+
+ group->field_data1 = mont;
+ mont = NULL;
+ group->field_data2 = one;
+ one = NULL;
+
+ ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx);
+
+ if (!ret)
+ {
+ BN_MONT_CTX_free(group->field_data1);
+ group->field_data1 = NULL;
+ BN_free(group->field_data2);
+ group->field_data2 = NULL;
+ }
+
+ err:
+ if (new_ctx != NULL)
+ BN_CTX_free(new_ctx);
+ if (mont != NULL)
+ BN_MONT_CTX_free(mont);
+ return ret;
+ }
+
+
+int ec_GFp_mont_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_MUL, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_mod_mul_montgomery(r, a, b, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_SQR, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_mod_mul_montgomery(r, a, a, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_encode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_ENCODE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_to_montgomery(r, a, (BN_MONT_CTX *)group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_decode(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, BN_CTX *ctx)
+ {
+ if (group->field_data1 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ return BN_from_montgomery(r, a, group->field_data1, ctx);
+ }
+
+
+int ec_GFp_mont_field_set_to_one(const EC_GROUP *group, BIGNUM *r, BN_CTX *ctx)
+ {
+ if (group->field_data2 == NULL)
+ {
+ ECerr(EC_F_EC_GFP_MONT_FIELD_DECODE, EC_R_NOT_INITIALIZED);
+ return 0;
+ }
+
+ if (!BN_copy(r, group->field_data2)) return 0;
+ return 1;
+ }