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/*
* Copyright 2019 The OpenSSL Project Authors. 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
*/
#include "internal/nelem.h"
#include "testutil.h"
#include <openssl/ec.h>
#include "ec_local.h"
#include <openssl/objects.h>
static size_t crv_len = 0;
static EC_builtin_curve *curves = NULL;
/* sanity checks field_inv function pointer in EC_METHOD */
static int group_field_tests(const EC_GROUP *group, BN_CTX *ctx)
{
BIGNUM *a = NULL, *b = NULL, *c = NULL;
int ret = 0;
if (group->meth->field_inv == NULL || group->meth->field_mul == NULL)
return 1;
BN_CTX_start(ctx);
a = BN_CTX_get(ctx);
b = BN_CTX_get(ctx);
if (!TEST_ptr(c = BN_CTX_get(ctx))
/* 1/1 = 1 */
|| !TEST_true(group->meth->field_inv(group, b, BN_value_one(), ctx))
|| !TEST_true(BN_is_one(b))
/* (1/a)*a = 1 */
|| !TEST_true(BN_pseudo_rand(a, BN_num_bits(group->field) - 1,
BN_RAND_TOP_ONE, BN_RAND_BOTTOM_ANY))
|| !TEST_true(group->meth->field_inv(group, b, a, ctx))
|| (group->meth->field_encode &&
!TEST_true(group->meth->field_encode(group, a, a, ctx)))
|| (group->meth->field_encode &&
!TEST_true(group->meth->field_encode(group, b, b, ctx)))
|| !TEST_true(group->meth->field_mul(group, c, a, b, ctx))
|| (group->meth->field_decode &&
!TEST_true(group->meth->field_decode(group, c, c, ctx)))
|| !TEST_true(BN_is_one(c)))
goto err;
/* 1/0 = error */
BN_zero(a);
if (!TEST_false(group->meth->field_inv(group, b, a, ctx))
|| !TEST_true(ERR_GET_LIB(ERR_peek_last_error()) == ERR_LIB_EC)
|| !TEST_true(ERR_GET_REASON(ERR_peek_last_error()) ==
EC_R_CANNOT_INVERT)
/* 1/p = error */
|| !TEST_false(group->meth->field_inv(group, b, group->field, ctx))
|| !TEST_true(ERR_GET_LIB(ERR_peek_last_error()) == ERR_LIB_EC)
|| !TEST_true(ERR_GET_REASON(ERR_peek_last_error()) ==
EC_R_CANNOT_INVERT))
goto err;
ERR_clear_error();
ret = 1;
err:
BN_CTX_end(ctx);
return ret;
}
/* wrapper for group_field_tests for explicit curve params and EC_METHOD */
static int field_tests(const EC_METHOD *meth, const unsigned char *params,
int len)
{
BN_CTX *ctx = NULL;
BIGNUM *p = NULL, *a = NULL, *b = NULL;
EC_GROUP *group = NULL;
int ret = 0;
if (!TEST_ptr(ctx = BN_CTX_new()))
return 0;
BN_CTX_start(ctx);
p = BN_CTX_get(ctx);
a = BN_CTX_get(ctx);
if (!TEST_ptr(b = BN_CTX_get(ctx))
|| !TEST_ptr(group = EC_GROUP_new(meth))
|| !TEST_true(BN_bin2bn(params, len, p))
|| !TEST_true(BN_bin2bn(params + len, len, a))
|| !TEST_true(BN_bin2bn(params + 2 * len, len, b))
|| !TEST_true(EC_GROUP_set_curve(group, p, a, b, ctx))
|| !group_field_tests(group, ctx))
goto err;
ret = 1;
err:
BN_CTX_end(ctx);
BN_CTX_free(ctx);
if (group != NULL)
EC_GROUP_free(group);
return ret;
}
/* NIST prime curve P-256 */
static const unsigned char params_p256[] = {
/* p */
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
/* a */
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC,
/* b */
0x5A, 0xC6, 0x35, 0xD8, 0xAA, 0x3A, 0x93, 0xE7, 0xB3, 0xEB, 0xBD, 0x55,
0x76, 0x98, 0x86, 0xBC, 0x65, 0x1D, 0x06, 0xB0, 0xCC, 0x53, 0xB0, 0xF6,
0x3B, 0xCE, 0x3C, 0x3E, 0x27, 0xD2, 0x60, 0x4B
};
#ifndef OPENSSL_NO_EC2M
/* NIST binary curve B-283 */
static const unsigned char params_b283[] = {
/* p */
0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0xA1,
/* a */
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
/* b */
0x02, 0x7B, 0x68, 0x0A, 0xC8, 0xB8, 0x59, 0x6D, 0xA5, 0xA4, 0xAF, 0x8A,
0x19, 0xA0, 0x30, 0x3F, 0xCA, 0x97, 0xFD, 0x76, 0x45, 0x30, 0x9F, 0xA2,
0xA5, 0x81, 0x48, 0x5A, 0xF6, 0x26, 0x3E, 0x31, 0x3B, 0x79, 0xA2, 0xF5
};
#endif
/* test EC_GFp_simple_method directly */
static int field_tests_ecp_simple(void)
{
TEST_info("Testing EC_GFp_simple_method()\n");
return field_tests(EC_GFp_simple_method(), params_p256,
sizeof(params_p256) / 3);
}
/* test EC_GFp_mont_method directly */
static int field_tests_ecp_mont(void)
{
TEST_info("Testing EC_GFp_mont_method()\n");
return field_tests(EC_GFp_mont_method(), params_p256,
sizeof(params_p256) / 3);
}
#ifndef OPENSSL_NO_EC2M
/* test EC_GF2m_simple_method directly */
static int field_tests_ec2_simple(void)
{
TEST_info("Testing EC_GF2m_simple_method()\n");
return field_tests(EC_GF2m_simple_method(), params_b283,
sizeof(params_b283) / 3);
}
#endif
/* test default method for a named curve */
static int field_tests_default(int n)
{
BN_CTX *ctx = NULL;
EC_GROUP *group = NULL;
int nid = curves[n].nid;
int ret = 0;
TEST_info("Testing curve %s\n", OBJ_nid2sn(nid));
if (!TEST_ptr(group = EC_GROUP_new_by_curve_name(nid))
|| !TEST_ptr(ctx = BN_CTX_new())
|| !group_field_tests(group, ctx))
goto err;
ret = 1;
err:
if (group != NULL)
EC_GROUP_free(group);
if (ctx != NULL)
BN_CTX_free(ctx);
return ret;
}
int setup_tests(void)
{
crv_len = EC_get_builtin_curves(NULL, 0);
if (!TEST_ptr(curves = OPENSSL_malloc(sizeof(*curves) *
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