| /* |
| * Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved. |
| * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* |
| * ECDSA low level APIs are deprecated for public use, but still ok for |
| * internal use. |
| */ |
| #include "internal/deprecated.h" |
| |
| #include <limits.h> |
| |
| #include <openssl/err.h> |
| #include <openssl/obj_mac.h> |
| #include "ec_local.h" |
| |
| const EC_METHOD *EC_GFp_nist_method(void) |
| { |
| static const EC_METHOD ret = { |
| EC_FLAGS_DEFAULT_OCT, |
| NID_X9_62_prime_field, |
| ec_GFp_simple_group_init, |
| ec_GFp_simple_group_finish, |
| ec_GFp_simple_group_clear_finish, |
| ec_GFp_nist_group_copy, |
| ec_GFp_nist_group_set_curve, |
| ec_GFp_simple_group_get_curve, |
| ec_GFp_simple_group_get_degree, |
| ec_group_simple_order_bits, |
| ec_GFp_simple_group_check_discriminant, |
| ec_GFp_simple_point_init, |
| ec_GFp_simple_point_finish, |
| ec_GFp_simple_point_clear_finish, |
| ec_GFp_simple_point_copy, |
| ec_GFp_simple_point_set_to_infinity, |
| ec_GFp_simple_point_set_affine_coordinates, |
| ec_GFp_simple_point_get_affine_coordinates, |
| 0, 0, 0, |
| ec_GFp_simple_add, |
| ec_GFp_simple_dbl, |
| ec_GFp_simple_invert, |
| ec_GFp_simple_is_at_infinity, |
| ec_GFp_simple_is_on_curve, |
| ec_GFp_simple_cmp, |
| ec_GFp_simple_make_affine, |
| ec_GFp_simple_points_make_affine, |
| 0 /* mul */ , |
| 0 /* precompute_mult */ , |
| 0 /* have_precompute_mult */ , |
| ec_GFp_nist_field_mul, |
| ec_GFp_nist_field_sqr, |
| 0 /* field_div */ , |
| ec_GFp_simple_field_inv, |
| 0 /* field_encode */ , |
| 0 /* field_decode */ , |
| 0, /* field_set_to_one */ |
| ec_key_simple_priv2oct, |
| ec_key_simple_oct2priv, |
| 0, /* set private */ |
| ec_key_simple_generate_key, |
| ec_key_simple_check_key, |
| ec_key_simple_generate_public_key, |
| 0, /* keycopy */ |
| 0, /* keyfinish */ |
| ecdh_simple_compute_key, |
| ecdsa_simple_sign_setup, |
| ecdsa_simple_sign_sig, |
| ecdsa_simple_verify_sig, |
| 0, /* field_inverse_mod_ord */ |
| ec_GFp_simple_blind_coordinates, |
| ec_GFp_simple_ladder_pre, |
| ec_GFp_simple_ladder_step, |
| ec_GFp_simple_ladder_post |
| }; |
| |
| return &ret; |
| } |
| |
| int ec_GFp_nist_group_copy(EC_GROUP *dest, const EC_GROUP *src) |
| { |
| dest->field_mod_func = src->field_mod_func; |
| |
| return ec_GFp_simple_group_copy(dest, src); |
| } |
| |
| int ec_GFp_nist_group_set_curve(EC_GROUP *group, const BIGNUM *p, |
| const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) |
| { |
| int ret = 0; |
| BN_CTX *new_ctx = NULL; |
| |
| if (ctx == NULL) |
| if ((ctx = new_ctx = BN_CTX_new_ex(group->libctx)) == NULL) |
| return 0; |
| |
| BN_CTX_start(ctx); |
| |
| if (BN_ucmp(BN_get0_nist_prime_192(), p) == 0) |
| group->field_mod_func = BN_nist_mod_192; |
| else if (BN_ucmp(BN_get0_nist_prime_224(), p) == 0) |
| group->field_mod_func = BN_nist_mod_224; |
| else if (BN_ucmp(BN_get0_nist_prime_256(), p) == 0) |
| group->field_mod_func = BN_nist_mod_256; |
| else if (BN_ucmp(BN_get0_nist_prime_384(), p) == 0) |
| group->field_mod_func = BN_nist_mod_384; |
| else if (BN_ucmp(BN_get0_nist_prime_521(), p) == 0) |
| group->field_mod_func = BN_nist_mod_521; |
| else { |
| ECerr(EC_F_EC_GFP_NIST_GROUP_SET_CURVE, EC_R_NOT_A_NIST_PRIME); |
| goto err; |
| } |
| |
| ret = ec_GFp_simple_group_set_curve(group, p, a, b, ctx); |
| |
| err: |
| BN_CTX_end(ctx); |
| BN_CTX_free(new_ctx); |
| return ret; |
| } |
| |
| int ec_GFp_nist_field_mul(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, |
| const BIGNUM *b, BN_CTX *ctx) |
| { |
| int ret = 0; |
| BN_CTX *ctx_new = NULL; |
| |
| if (!group || !r || !a || !b) { |
| ECerr(EC_F_EC_GFP_NIST_FIELD_MUL, ERR_R_PASSED_NULL_PARAMETER); |
| goto err; |
| } |
| if (!ctx) |
| if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL) |
| goto err; |
| |
| if (!BN_mul(r, a, b, ctx)) |
| goto err; |
| if (!group->field_mod_func(r, r, group->field, ctx)) |
| goto err; |
| |
| ret = 1; |
| err: |
| BN_CTX_free(ctx_new); |
| return ret; |
| } |
| |
| int ec_GFp_nist_field_sqr(const EC_GROUP *group, BIGNUM *r, const BIGNUM *a, |
| BN_CTX *ctx) |
| { |
| int ret = 0; |
| BN_CTX *ctx_new = NULL; |
| |
| if (!group || !r || !a) { |
| ECerr(EC_F_EC_GFP_NIST_FIELD_SQR, EC_R_PASSED_NULL_PARAMETER); |
| goto err; |
| } |
| if (!ctx) |
| if ((ctx_new = ctx = BN_CTX_new_ex(group->libctx)) == NULL) |
| goto err; |
| |
| if (!BN_sqr(r, a, ctx)) |
| goto err; |
| if (!group->field_mod_func(r, r, group->field, ctx)) |
| goto err; |
| |
| ret = 1; |
| err: |
| BN_CTX_free(ctx_new); |
| return ret; |
| } |