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198 lines
9.6 KiB
C
198 lines
9.6 KiB
C
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/*
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* Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/err.h>
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#include "ec_lcl.h"
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#include "s390x_arch.h"
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/* Size of parameter blocks */
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#define S390X_SIZE_PARAM 4096
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/* Size of fields in parameter blocks */
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#define S390X_SIZE_P256 32
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#define S390X_SIZE_P384 48
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#define S390X_SIZE_P521 80
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/* Offsets of fields in PCC parameter blocks */
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#define S390X_OFF_RES_X(n) (0 * n)
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#define S390X_OFF_RES_Y(n) (1 * n)
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#define S390X_OFF_SRC_X(n) (2 * n)
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#define S390X_OFF_SRC_Y(n) (3 * n)
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#define S390X_OFF_SCALAR(n) (4 * n)
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static int ec_GFp_s390x_nistp_mul(const EC_GROUP *group, EC_POINT *r,
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const BIGNUM *scalar,
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size_t num, const EC_POINT *points[],
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const BIGNUM *scalars[],
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BN_CTX *ctx, unsigned int fc, int len)
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{
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unsigned char param[S390X_SIZE_PARAM];
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BIGNUM *x, *y;
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const EC_POINT *point_ptr = NULL;
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const BIGNUM *scalar_ptr = NULL;
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BN_CTX *new_ctx = NULL;
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int rc = -1;
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if (ctx == NULL) {
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ctx = new_ctx = BN_CTX_new_ex(group->libctx);
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if (ctx == NULL)
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return 0;
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}
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BN_CTX_start(ctx);
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x = BN_CTX_get(ctx);
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y = BN_CTX_get(ctx);
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if (x == NULL || y == NULL) {
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rc = 0;
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goto ret;
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}
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/*
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* Use PCC for EC keygen and ECDH key derivation:
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* scalar * generator and scalar * peer public key,
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* scalar in [0,order).
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*/
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if ((scalar != NULL && num == 0 && BN_is_negative(scalar) == 0)
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|| (scalar == NULL && num == 1 && BN_is_negative(scalars[0]) == 0)) {
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if (num == 0) {
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point_ptr = EC_GROUP_get0_generator(group);
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scalar_ptr = scalar;
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} else {
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point_ptr = points[0];
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scalar_ptr = scalars[0];
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}
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if (EC_POINT_is_at_infinity(group, point_ptr) == 1
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|| BN_is_zero(scalar_ptr)) {
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rc = EC_POINT_set_to_infinity(group, r);
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goto ret;
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}
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memset(¶m, 0, sizeof(param));
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if (group->meth->point_get_affine_coordinates(group, point_ptr,
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x, y, ctx) != 1
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|| BN_bn2binpad(x, param + S390X_OFF_SRC_X(len), len) == -1
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|| BN_bn2binpad(y, param + S390X_OFF_SRC_Y(len), len) == -1
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|| BN_bn2binpad(scalar_ptr,
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param + S390X_OFF_SCALAR(len), len) == -1
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|| s390x_pcc(fc, param) != 0
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|| BN_bin2bn(param + S390X_OFF_RES_X(len), len, x) == NULL
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|| BN_bin2bn(param + S390X_OFF_RES_Y(len), len, y) == NULL
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|| group->meth->point_set_affine_coordinates(group, r,
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x, y, ctx) != 1)
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goto ret;
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rc = 1;
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}
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ret:
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/* Otherwise use default. */
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if (rc == -1)
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rc = ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx);
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OPENSSL_cleanse(param, sizeof(param));
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BN_CTX_end(ctx);
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BN_CTX_free(new_ctx);
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return rc;
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}
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#define EC_GFP_S390X_NISTP_METHOD(bits) \
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\
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static int ec_GFp_s390x_nistp##bits##_mul(const EC_GROUP *group, \
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EC_POINT *r, \
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const BIGNUM *scalar, \
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size_t num, \
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const EC_POINT *points[], \
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const BIGNUM *scalars[], \
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BN_CTX *ctx) \
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{ \
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return ec_GFp_s390x_nistp_mul(group, r, scalar, num, points, \
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scalars, ctx, \
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S390X_SCALAR_MULTIPLY_P##bits, \
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S390X_SIZE_P##bits); \
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} \
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\
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const EC_METHOD *EC_GFp_s390x_nistp##bits##_method(void) \
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{ \
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static const EC_METHOD EC_GFp_s390x_nistp##bits##_meth = { \
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EC_FLAGS_DEFAULT_OCT, \
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NID_X9_62_prime_field, \
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ec_GFp_simple_group_init, \
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ec_GFp_simple_group_finish, \
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ec_GFp_simple_group_clear_finish, \
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ec_GFp_simple_group_copy, \
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ec_GFp_simple_group_set_curve, \
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ec_GFp_simple_group_get_curve, \
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ec_GFp_simple_group_get_degree, \
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ec_group_simple_order_bits, \
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ec_GFp_simple_group_check_discriminant, \
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ec_GFp_simple_point_init, \
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ec_GFp_simple_point_finish, \
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ec_GFp_simple_point_clear_finish, \
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ec_GFp_simple_point_copy, \
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ec_GFp_simple_point_set_to_infinity, \
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ec_GFp_simple_set_Jprojective_coordinates_GFp, \
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ec_GFp_simple_get_Jprojective_coordinates_GFp, \
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ec_GFp_simple_point_set_affine_coordinates, \
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ec_GFp_simple_point_get_affine_coordinates, \
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NULL, /* point_set_compressed_coordinates */ \
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NULL, /* point2oct */ \
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NULL, /* oct2point */ \
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ec_GFp_simple_add, \
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ec_GFp_simple_dbl, \
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ec_GFp_simple_invert, \
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ec_GFp_simple_is_at_infinity, \
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ec_GFp_simple_is_on_curve, \
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ec_GFp_simple_cmp, \
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ec_GFp_simple_make_affine, \
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ec_GFp_simple_points_make_affine, \
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ec_GFp_s390x_nistp##bits##_mul, \
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NULL, /* precompute_mult */ \
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NULL, /* have_precompute_mult */ \
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ec_GFp_simple_field_mul, \
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ec_GFp_simple_field_sqr, \
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NULL, /* field_div */ \
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ec_GFp_simple_field_inv, \
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NULL, /* field_encode */ \
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NULL, /* field_decode */ \
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NULL, /* field_set_to_one */ \
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ec_key_simple_priv2oct, \
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ec_key_simple_oct2priv, \
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NULL, /* set_private */ \
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ec_key_simple_generate_key, \
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ec_key_simple_check_key, \
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ec_key_simple_generate_public_key, \
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NULL, /* keycopy */ \
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NULL, /* keyfinish */ \
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ecdh_simple_compute_key, \
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NULL, /* field_inverse_mod_ord */ \
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ec_GFp_simple_blind_coordinates, \
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ec_GFp_simple_ladder_pre, \
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ec_GFp_simple_ladder_step, \
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ec_GFp_simple_ladder_post \
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}; \
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static const EC_METHOD *ret; \
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\
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if (OPENSSL_s390xcap_P.pcc[1] \
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& S390X_CAPBIT(S390X_SCALAR_MULTIPLY_P##bits)) \
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ret = &EC_GFp_s390x_nistp##bits##_meth; \
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else \
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ret = EC_GFp_mont_method(); \
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\
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return ret; \
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}
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EC_GFP_S390X_NISTP_METHOD(256)
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EC_GFP_S390X_NISTP_METHOD(384)
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EC_GFP_S390X_NISTP_METHOD(521)
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