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b3a7b51f18
boringssl/crypto/bn/bn_test.cc
David Benjamin b3a7b51f18 Fix off-by-one in BN_rand 
If BN_rand is called with |bits| set to 1 and |top| set to 1 then a 1 byte
buffer overflow can occur.

See also upstream's efee575ad464bfb60bf72dcb73f9b51768f4b1a1. But rather than
making |BN_rand| fail, be consistent with the |bits| = 0 case and just don't
set the bits that don't exist. Add tests to ensure the degenerate cases behave.

Change-Id: I5e9fbe6fd8f7f7b2e011a680f2fbe6d7ed4dab65
Reviewed-on: https://boringssl-review.googlesource.com/4893
Reviewed-by: Adam Langley <agl@google.com>
2015-05-27 22:03:05 +00:00

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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
*
* Portions of the attached software ("Contribution") are developed by
* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
*
* The Contribution is licensed pursuant to the Eric Young open source
* license provided above.
*
* The binary polynomial arithmetic software is originally written by
* Sheueling Chang Shantz and Douglas Stebila of Sun Microsystems
* Laboratories. */
/* For BIGNUM format macros. */
#if !defined(__STDC_FORMAT_MACROS)
#define __STDC_FORMAT_MACROS
#endif
#include <stdio.h>
#include <string.h>
#include <openssl/bn.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../crypto/test/scoped_types.h"
static const int num0 = 100; // number of tests
static const int num1 = 50; // additional tests for some functions
static const int num2 = 5; // number of tests for slow functions
static bool test_add(FILE *fp);
static bool test_sub(FILE *fp);
static bool test_lshift1(FILE *fp);
static bool test_lshift(FILE *fp, BN_CTX *ctx, ScopedBIGNUM a);
static bool test_rshift1(FILE *fp);
static bool test_rshift(FILE *fp, BN_CTX *ctx);
static bool test_sqr(FILE *fp, BN_CTX *ctx);
static bool test_mul(FILE *fp);
static bool test_div(FILE *fp, BN_CTX *ctx);
static int rand_neg();
static bool test_div_word(FILE *fp);
static bool test_mont(FILE *fp, BN_CTX *ctx);
static bool test_mod(FILE *fp, BN_CTX *ctx);
static bool test_mod_mul(FILE *fp, BN_CTX *ctx);
static bool test_mod_exp(FILE *fp, BN_CTX *ctx);
static bool test_mod_exp_mont_consttime(FILE *fp, BN_CTX *ctx);
static bool test_exp(FILE *fp, BN_CTX *ctx);
static bool test_mod_sqrt(FILE *fp, BN_CTX *ctx);
static bool test_exp_mod_zero(void);
static bool test_small_prime(FILE *fp, BN_CTX *ctx);
static bool test_mod_exp_mont5(FILE *fp, BN_CTX *ctx);
static bool test_sqrt(FILE *fp, BN_CTX *ctx);
static bool test_bn2bin_padded(FILE *fp, BN_CTX *ctx);
static bool test_dec2bn(FILE *fp, BN_CTX *ctx);
static bool test_hex2bn(FILE *fp, BN_CTX *ctx);
static bool test_asc2bn(FILE *fp, BN_CTX *ctx);
static bool test_rand();
// g_results can be set to true to cause the result of each computation to be
// printed.
static bool g_results = false;
static const uint8_t kSample[] =
"\xC6\x4F\x43\x04\x2A\xEA\xCA\x6E\x58\x36\x80\x5B\xE8\xC9"
"\x9B\x04\x5D\x48\x36\xC2\xFD\x16\xC9\x64\xF0";
// A wrapper around puts that takes its arguments in the same order as our *_fp
// functions.
static void puts_fp(FILE *out, const char *m) {
fputs(m, out);
}
static void message(FILE *out, const char *m) {
puts_fp(out, "print \"test ");
puts_fp(out, m);
puts_fp(out, "\\n\"\n");
}
int main(int argc, char *argv[]) {
CRYPTO_library_init();
argc--;
argv++;
while (argc >= 1) {
if (strcmp(*argv, "-results") == 0) {
g_results = true;
}
argc--;
argv++;
}
ScopedBN_CTX ctx(BN_CTX_new());
if (!ctx) {
return 1;
}
if (!g_results) {
puts_fp(stdout, "obase=16\nibase=16\n");
}
message(stdout, "BN_add");
if (!test_add(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_sub");
if (!test_sub(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_lshift1");
if (!test_lshift1(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_lshift (fixed)");
ScopedBIGNUM sample(BN_bin2bn(kSample, sizeof(kSample) - 1, NULL));
if (!sample) {
return 1;
}
if (!test_lshift(stdout, ctx.get(), bssl::move(sample))) {
return 1;
}
fflush(stdout);
message(stdout, "BN_lshift");
if (!test_lshift(stdout, ctx.get(), nullptr)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_rshift1");
if (!test_rshift1(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_rshift");
if (!test_rshift(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_sqr");
if (!test_sqr(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mul");
if (!test_mul(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_div");
if (!test_div(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_div_word");
if (!test_div_word(stdout)) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mod");
if (!test_mod(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mod_mul");
if (!test_mod_mul(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mont");
if (!test_mont(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mod_exp");
if (!test_mod_exp(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mod_exp_mont_consttime");
if (!test_mod_exp_mont_consttime(stdout, ctx.get()) ||
!test_mod_exp_mont5(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_exp");
if (!test_exp(stdout, ctx.get()) ||
!test_exp_mod_zero()) {
return 1;
}
fflush(stdout);
message(stdout, "BN_mod_sqrt");
if (!test_mod_sqrt(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "Small prime generation");
if (!test_small_prime(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_sqrt");
if (!test_sqrt(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_bn2bin_padded");
if (!test_bn2bin_padded(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_dec2bn");
if (!test_dec2bn(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_hex2bn");
if (!test_hex2bn(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_asc2bn");
if (!test_asc2bn(stdout, ctx.get())) {
return 1;
}
fflush(stdout);
message(stdout, "BN_rand");
if (!test_rand()) {
return 1;
}
fflush(stdout);
printf("PASS\n");
return 0;
}
static bool test_add(FILE *fp) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
if (!a || !b || !c || !BN_rand(a.get(), 512, 0, 0)) {
return false;
}
for (int i = 0; i < num0; i++) {
if (!BN_rand(b.get(), 450 + i, 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
if (!BN_add(c.get(), a.get(), b.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " + ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
a->neg = !a->neg;
b->neg = !b->neg;
if (!BN_add(c.get(), c.get(), b.get()) ||
!BN_add(c.get(), c.get(), a.get())) {
return false;
}
if (!BN_is_zero(c.get())) {
fprintf(stderr, "Add test failed!\n");
return false;
}
}
return true;
}
static bool test_sub(FILE *fp) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
if (!a || !b || !c) {
return false;
}
for (int i = 0; i < num0 + num1; i++) {
if (i < num1) {
if (!BN_rand(a.get(), 512, 0, 0) ||
!BN_copy(b.get(), a.get()) ||
!BN_set_bit(a.get(), i) ||
!BN_add_word(b.get(), i)) {
return false;
}
} else {
if (!BN_rand(b.get(), 400 + i - num1, 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
}
if (!BN_sub(c.get(), a.get(), b.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " - ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_add(c.get(), c.get(), b.get()) ||
!BN_sub(c.get(), c.get(), a.get())) {
return false;
}
if (!BN_is_zero(c.get())) {
fprintf(stderr, "Subtract test failed!\n");
return false;
}
}
return true;
}
static bool test_div(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e) {
return false;
}
for (int i = 0; i < num0 + num1; i++) {
if (i < num1) {
if (!BN_rand(a.get(), 400, 0, 0) ||
!BN_copy(b.get(), a.get()) ||
!BN_lshift(a.get(), a.get(), i) ||
!BN_add_word(a.get(), i)) {
return false;
}
} else if (!BN_rand(b.get(), 50 + 3 * (i - num1), 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
if (!BN_div(d.get(), c.get(), a.get(), b.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " / ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, d.get());
puts_fp(fp, "\n");
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " % ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_mul(e.get(), d.get(), b.get(), ctx) ||
!BN_add(d.get(), e.get(), c.get()) ||
!BN_sub(d.get(), d.get(), a.get())) {
return false;
}
if (!BN_is_zero(d.get())) {
fprintf(stderr, "Division test failed!\n");
return false;
}
}
// Test that BN_div never gives negative zero in the quotient.
if (!BN_set_word(a.get(), 1) ||
!BN_set_word(b.get(), 2)) {
return false;
}
BN_set_negative(a.get(), 1);
if (!BN_div(d.get(), c.get(), a.get(), b.get(), ctx)) {
return false;
}
if (!BN_is_zero(d.get()) || BN_is_negative(d.get())) {
fprintf(stderr, "Division test failed!\n");
return false;
}
// Test that BN_div never gives negative zero in the remainder.
if (!BN_set_word(b.get(), 1)) {
return false;
}
if (!BN_div(d.get(), c.get(), a.get(), b.get(), ctx)) {
return false;
}
if (!BN_is_zero(c.get()) || BN_is_negative(c.get())) {
fprintf(stderr, "Division test failed!\n");
return false;
}
return true;
}
static bool test_lshift1(FILE *fp) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
if (!a || !b || !c || !BN_rand(a.get(), 200, 0, 0)) {
return false;
}
a->neg = rand_neg();
for (int i = 0; i < num0; i++) {
if (!BN_lshift1(b.get(), a.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * 2");
puts_fp(fp, " - ");
}
BN_print_fp(fp, b.get());
puts_fp(fp, "\n");
}
if (!BN_add(c.get(), a.get(), a.get()) ||
!BN_sub(a.get(), b.get(), c.get())) {
return false;
}
if (!BN_is_zero(a.get())) {
fprintf(stderr, "Left shift one test failed!\n");
return false;
}
if (!BN_copy(a.get(), b.get())) {
return false;
}
}
return true;
}
static bool test_rshift(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e || !BN_one(c.get()) ||
!BN_rand(a.get(), 200, 0, 0)) {
return false;
}
a->neg = rand_neg();
for (int i = 0; i < num0; i++) {
if (!BN_rshift(b.get(), a.get(), i + 1) ||
!BN_add(c.get(), c.get(), c.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " / ");
BN_print_fp(fp, c.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, b.get());
puts_fp(fp, "\n");
}
if (!BN_div(d.get(), e.get(), a.get(), c.get(), ctx) ||
!BN_sub(d.get(), d.get(), b.get())) {
return false;
}
if (!BN_is_zero(d.get())) {
fprintf(stderr, "Right shift test failed!\n");
return false;
}
}
return true;
}
static bool test_rshift1(FILE *fp) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
if (!a || !b || !c || !BN_rand(a.get(), 200, 0, 0)) {
return false;
}
a->neg = rand_neg();
for (int i = 0; i < num0; i++) {
if (!BN_rshift1(b.get(), a.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " / 2");
puts_fp(fp, " - ");
}
BN_print_fp(fp, b.get());
puts_fp(fp, "\n");
}
if (!BN_sub(c.get(), a.get(), b.get()) ||
!BN_sub(c.get(), c.get(), b.get())) {
return false;
}
if (!BN_is_zero(c.get()) && !BN_abs_is_word(c.get(), 1)) {
fprintf(stderr, "Right shift one test failed!\n");
return false;
}
if (!BN_copy(a.get(), b.get())) {
return false;
}
}
return true;
}
static bool test_lshift(FILE *fp, BN_CTX *ctx, ScopedBIGNUM a) {
if (!a) {
a.reset(BN_new());
if (!a || !BN_rand(a.get(), 200, 0, 0)) {
return false;
}
a->neg = rand_neg();
}
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
if (!b || !c || !d || !BN_one(c.get())) {
return false;
}
for (int i = 0; i < num0; i++) {
if (!BN_lshift(b.get(), a.get(), i + 1) ||
!BN_add(c.get(), c.get(), c.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, c.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, b.get());
puts_fp(fp, "\n");
}
if (!BN_mul(d.get(), a.get(), c.get(), ctx) ||
!BN_sub(d.get(), d.get(), b.get())) {
return false;
}
if (!BN_is_zero(d.get())) {
fprintf(stderr, "Left shift test failed!\n");
fprintf(stderr, "a=");
BN_print_fp(stderr, a.get());
fprintf(stderr, "\nb=");
BN_print_fp(stderr, b.get());
fprintf(stderr, "\nc=");
BN_print_fp(stderr, c.get());
fprintf(stderr, "\nd=");
BN_print_fp(stderr, d.get());
fprintf(stderr, "\n");
return false;
}
}
return true;
}
static bool test_mul(FILE *fp) {
ScopedBN_CTX ctx(BN_CTX_new());
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!ctx || !a || !b || !c || !d || !e) {
return false;
}
for (int i = 0; i < num0 + num1; i++) {
if (i <= num1) {
if (!BN_rand(a.get(), 100, 0, 0) ||
!BN_rand(b.get(), 100, 0, 0)) {
return false;
}
} else if (!BN_rand(b.get(), i - num1, 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
if (!BN_mul(c.get(), a.get(), b.get(), ctx.get())) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_div(d.get(), e.get(), c.get(), a.get(), ctx.get()) ||
!BN_sub(d.get(), d.get(), b.get())) {
return false;
}
if (!BN_is_zero(d.get()) || !BN_is_zero(e.get())) {
fprintf(stderr, "Multiplication test failed!\n");
return false;
}
}
// Test that BN_mul never gives negative zero.
if (!BN_set_word(a.get(), 1)) {
return false;
}
BN_set_negative(a.get(), 1);
BN_zero(b.get());
if (!BN_mul(c.get(), a.get(), b.get(), ctx.get())) {
return false;
}
if (!BN_is_zero(c.get()) || BN_is_negative(c.get())) {
fprintf(stderr, "Multiplication test failed!\n");
return false;
}
return true;
}
static bool test_sqr(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !c || !d || !e) {
return false;
}
for (int i = 0; i < num0; i++) {
if (!BN_rand(a.get(), 40 + i * 10, 0, 0)) {
return false;
}
a->neg = rand_neg();
if (!BN_sqr(c.get(), a.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, a.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_div(d.get(), e.get(), c.get(), a.get(), ctx) ||
!BN_sub(d.get(), d.get(), a.get())) {
return false;
}
if (!BN_is_zero(d.get()) || !BN_is_zero(e.get())) {
fprintf(stderr, "Square test failed!\n");
return false;
}
}
// Regression test for a BN_sqr overflow bug.
BIGNUM *a_raw = a.get();
if (!BN_hex2bn(
&a_raw,
"80000000000000008000000000000001FFFFFFFFFFFFFFFE0000000000000000") ||
!BN_sqr(c.get(), a.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, a.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_mul(d.get(), a.get(), a.get(), ctx)) {
return false;
}
if (BN_cmp(c.get(), d.get())) {
fprintf(stderr,
"Square test failed: BN_sqr and BN_mul produce "
"different results!\n");
return false;
}
// Regression test for a BN_sqr overflow bug.
a_raw = a.get();
if (!BN_hex2bn(
&a_raw,
"80000000000000000000000080000001FFFFFFFE000000000000000000000000") ||
!BN_sqr(c.get(), a.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, a.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_mul(d.get(), a.get(), a.get(), ctx)) {
return false;
}
if (BN_cmp(c.get(), d.get())) {
fprintf(stderr,
"Square test failed: BN_sqr and BN_mul produce "
"different results!\n");
return false;
}
return true;
}
static int rand_neg() {
static unsigned int neg = 0;
static const int sign[8] = {0, 0, 0, 1, 1, 0, 1, 1};
return sign[(neg++) % 8];
}
static void print_word(FILE *fp, BN_ULONG w) {
fprintf(fp, BN_HEX_FMT1, w);
}
static bool test_div_word(FILE *fp) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
if (!a || !b) {
return false;
}
for (int i = 0; i < num0; i++) {
BN_ULONG s;
do {
if (!BN_rand(a.get(), 512, -1, 0) ||
!BN_rand(b.get(), BN_BITS2, -1, 0)) {
return false;
}
s = b->d[0];
} while (!s);
if (!BN_copy(b.get(), a.get())) {
return false;
}
BN_ULONG r = BN_div_word(b.get(), s);
if (r == (BN_ULONG)-1) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " / ");
print_word(fp, s);
puts_fp(fp, " - ");
}
BN_print_fp(fp, b.get());
puts_fp(fp, "\n");
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " % ");
print_word(fp, s);
puts_fp(fp, " - ");
}
print_word(fp, r);
puts_fp(fp, "\n");
}
if (!BN_mul_word(b.get(), s) ||
!BN_add_word(b.get(), r) ||
!BN_sub(b.get(), a.get(), b.get())) {
return false;
}
if (!BN_is_zero(b.get())) {
fprintf(stderr, "Division (word) test failed!\n");
return false;
}
}
return true;
}
static bool test_mont(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM A(BN_new());
ScopedBIGNUM B(BN_new());
ScopedBIGNUM n(BN_new());
ScopedBN_MONT_CTX mont(BN_MONT_CTX_new());
if (!a || !b || !c || !d || !A || !B || !n || !mont ||
!BN_rand(a.get(), 100, 0, 0) ||
!BN_rand(b.get(), 100, 0, 0)) {
return false;
}
for (int i = 0; i < num2; i++) {
int bits = (200 * (i + 1)) / num2;
if (bits == 0) {
continue;
}
if (!BN_rand(n.get(), bits, 0, 1) ||
!BN_MONT_CTX_set(mont.get(), n.get(), ctx) ||
!BN_nnmod(a.get(), a.get(), n.get(), ctx) ||
!BN_nnmod(b.get(), b.get(), n.get(), ctx) ||
!BN_to_montgomery(A.get(), a.get(), mont.get(), ctx) ||
!BN_to_montgomery(B.get(), b.get(), mont.get(), ctx) ||
!BN_mod_mul_montgomery(c.get(), A.get(), B.get(), mont.get(), ctx) ||
!BN_from_montgomery(A.get(), c.get(), mont.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, b.get());
puts_fp(fp, " % ");
BN_print_fp(fp, &mont->N);
puts_fp(fp, " - ");
}
BN_print_fp(fp, A.get());
puts_fp(fp, "\n");
}
if (!BN_mod_mul(d.get(), a.get(), b.get(), n.get(), ctx) ||
!BN_sub(d.get(), d.get(), A.get())) {
return false;
}
if (!BN_is_zero(d.get())) {
fprintf(stderr, "Montgomery multiplication test failed!\n");
return false;
}
}
return true;
}
static bool test_mod(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e ||
!BN_rand(a.get(), 1024, 0, 0)) {
return false;
}
for (int i = 0; i < num0; i++) {
if (!BN_rand(b.get(), 450 + i * 10, 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
if (!BN_mod(c.get(), a.get(), b.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " % ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, c.get());
puts_fp(fp, "\n");
}
if (!BN_div(d.get(), e.get(), a.get(), b.get(), ctx) ||
!BN_sub(e.get(), e.get(), c.get())) {
return false;
}
if (!BN_is_zero(e.get())) {
fprintf(stderr, "Modulo test failed!\n");
return false;
}
}
return true;
}
static bool test_mod_mul(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e) {
return false;
}
for (int j = 0; j < 3; j++) {
if (!BN_rand(c.get(), 1024, 0, 0)) {
return false;
}
for (int i = 0; i < num0; i++) {
if (!BN_rand(a.get(), 475 + i * 10, 0, 0) ||
!BN_rand(b.get(), 425 + i * 11, 0, 0)) {
return false;
}
a->neg = rand_neg();
b->neg = rand_neg();
if (!BN_mod_mul(e.get(), a.get(), b.get(), c.get(), ctx)) {
ERR_print_errors_fp(stderr);
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " * ");
BN_print_fp(fp, b.get());
puts_fp(fp, " % ");
BN_print_fp(fp, c.get());
if (a->neg != b->neg && !BN_is_zero(e.get())) {
// If (a*b) % c is negative, c must be added
// in order to obtain the normalized remainder
// (new with OpenSSL 0.9.7, previous versions of
// BN_mod_mul could generate negative results)
puts_fp(fp, " + ");
BN_print_fp(fp, c.get());
}
puts_fp(fp, " - ");
}
BN_print_fp(fp, e.get());
puts_fp(fp, "\n");
}
if (!BN_mul(d.get(), a.get(), b.get(), ctx) ||
!BN_sub(d.get(), d.get(), e.get()) ||
!BN_div(a.get(), b.get(), d.get(), c.get(), ctx)) {
return false;
}
if (!BN_is_zero(b.get())) {
fprintf(stderr, "Modulo multiply test failed!\n");
ERR_print_errors_fp(stderr);
return false;
}
}
}
return true;
}
static bool test_mod_exp(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e ||
!BN_rand(c.get(), 30, 0, 1)) { // must be odd for montgomery
return false;
}
for (int i = 0; i < num2; i++) {
if (!BN_rand(a.get(), 20 + i * 5, 0, 0) ||
!BN_rand(b.get(), 2 + i, 0, 0) ||
!BN_mod_exp(d.get(), a.get(), b.get(), c.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " ^ ");
BN_print_fp(fp, b.get());
puts_fp(fp, " % ");
BN_print_fp(fp, c.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, d.get());
puts_fp(fp, "\n");
}
if (!BN_exp(e.get(), a.get(), b.get(), ctx) ||
!BN_sub(e.get(), e.get(), d.get()) ||
!BN_div(a.get(), b.get(), e.get(), c.get(), ctx)) {
return false;
}
if (!BN_is_zero(b.get())) {
fprintf(stderr, "Modulo exponentiation test failed!\n");
return false;
}
}
return true;
}
static bool test_mod_exp_mont_consttime(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM c(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !c || !d || !e ||
!BN_rand(c.get(), 30, 0, 1)) { // must be odd for montgomery
return false;
}
for (int i = 0; i < num2; i++) {
if (!BN_rand(a.get(), 20 + i * 5, 0, 0) ||
!BN_rand(b.get(), 2 + i, 0, 0) ||
!BN_mod_exp_mont_consttime(d.get(), a.get(), b.get(), c.get(), ctx,
NULL)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " ^ ");
BN_print_fp(fp, b.get());
puts_fp(fp, " % ");
BN_print_fp(fp, c.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, d.get());
puts_fp(fp, "\n");
}
if (!BN_exp(e.get(), a.get(), b.get(), ctx) ||
!BN_sub(e.get(), e.get(), d.get()) ||
!BN_div(a.get(), b.get(), e.get(), c.get(), ctx)) {
return false;
}
if (!BN_is_zero(b.get())) {
fprintf(stderr, "Modulo exponentiation test failed!\n");
return false;
}
}
return true;
}
// Test constant-time modular exponentiation with 1024-bit inputs,
// which on x86_64 cause a different code branch to be taken.
static bool test_mod_exp_mont5(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM p(BN_new());
ScopedBIGNUM m(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !p || !m || !d || !e ||
!BN_rand(m.get(), 1024, 0, 1) || // must be odd for montgomery
!BN_rand(a.get(), 1024, 0, 0)) {
return false;
}
// Zero exponent.
BN_zero(p.get());
if (!BN_mod_exp_mont_consttime(d.get(), a.get(), p.get(), m.get(), ctx,
NULL)) {
return false;
}
if (!BN_is_one(d.get())) {
fprintf(stderr, "Modular exponentiation test failed!\n");
return false;
}
if (!BN_rand(p.get(), 1024, 0, 0)) {
return false;
}
// Zero input.
BN_zero(a.get());
if (!BN_mod_exp_mont_consttime(d.get(), a.get(), p.get(), m.get(), ctx,
NULL)) {
return false;
}
if (!BN_is_zero(d.get())) {
fprintf(stderr, "Modular exponentiation test failed!\n");
return false;
}
// Craft an input whose Montgomery representation is 1, i.e., shorter than the
// modulus m, in order to test the const time precomputation
// scattering/gathering.
ScopedBN_MONT_CTX mont(BN_MONT_CTX_new());
if (!mont || !BN_one(a.get()) ||
!BN_MONT_CTX_set(mont.get(), m.get(), ctx) ||
!BN_from_montgomery(e.get(), a.get(), mont.get(), ctx) ||
!BN_mod_exp_mont_consttime(d.get(), e.get(), p.get(), m.get(), ctx,
NULL) ||
!BN_mod_exp(a.get(), e.get(), p.get(), m.get(), ctx)) {
return false;
}
if (BN_cmp(a.get(), d.get()) != 0) {
fprintf(stderr, "Modular exponentiation test failed!\n");
return false;
}
// Finally, some regular test vectors.
if (!BN_rand(e.get(), 1024, 0, 0) ||
!BN_mod_exp_mont_consttime(d.get(), e.get(), p.get(), m.get(), ctx,
NULL) ||
!BN_mod_exp(a.get(), e.get(), p.get(), m.get(), ctx)) {
return false;
}
if (BN_cmp(a.get(), d.get()) != 0) {
fprintf(stderr, "Modular exponentiation test failed!\n");
return false;
}
return true;
}
static bool test_exp(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM b(BN_new());
ScopedBIGNUM d(BN_new());
ScopedBIGNUM e(BN_new());
if (!a || !b || !d || !e) {
return false;
}
for (int i = 0; i < num2; i++) {
if (!BN_rand(a.get(), 20 + i * 5, 0, 0) ||
!BN_rand(b.get(), 2 + i, 0, 0) ||
!BN_exp(d.get(), a.get(), b.get(), ctx)) {
return false;
}
if (fp != NULL) {
if (!g_results) {
BN_print_fp(fp, a.get());
puts_fp(fp, " ^ ");
BN_print_fp(fp, b.get());
puts_fp(fp, " - ");
}
BN_print_fp(fp, d.get());
puts_fp(fp, "\n");
}
if (!BN_one(e.get())) {
return false;
}
for (; !BN_is_zero(b.get()); BN_sub(b.get(), b.get(), BN_value_one())) {
if (!BN_mul(e.get(), e.get(), a.get(), ctx)) {
return false;
}
}
if (!BN_sub(e.get(), e.get(), d.get())) {
return false;
}
if (!BN_is_zero(e.get())) {
fprintf(stderr, "Exponentiation test failed!\n");
return false;
}
}
return true;
}
// test_exp_mod_zero tests that 1**0 mod 1 == 0.
static bool test_exp_mod_zero(void) {
ScopedBIGNUM zero(BN_new());
if (!zero) {
return false;
}
BN_zero(zero.get());
ScopedBN_CTX ctx(BN_CTX_new());
ScopedBIGNUM r(BN_new());
if (!ctx || !r ||
!BN_mod_exp(r.get(), BN_value_one(), zero.get(), BN_value_one(), ctx.get())) {
return false;
}
if (!BN_is_zero(r.get())) {
printf("1**0 mod 1 = ");
BN_print_fp(stdout, r.get());
printf(", should be 0\n");
return false;
}
return true;
}
static int genprime_cb(int p, int n, BN_GENCB *arg) {
char c = '*';
if (p == 0) {
c = '.';
} else if (p == 1) {
c = '+';
} else if (p == 2) {
c = '*';
} else if (p == 3) {
c = '\n';
}
putc(c, stdout);
fflush(stdout);
return 1;
}
static bool test_mod_sqrt(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM a(BN_new());
ScopedBIGNUM p(BN_new());
ScopedBIGNUM r(BN_new());
if (!a || !p || !r) {
return false;
}
BN_GENCB cb;
BN_GENCB_set(&cb, genprime_cb, NULL);
for (int i = 0; i < 16; i++) {
if (i < 8) {
const unsigned kPrimes[8] = {2, 3, 5, 7, 11, 13, 17, 19};
if (!BN_set_word(p.get(), kPrimes[i])) {
return false;
}
} else {
if (!BN_set_word(a.get(), 32) ||
!BN_set_word(r.get(), 2 * i + 1) ||
!BN_generate_prime_ex(p.get(), 256, 0, a.get(), r.get(), &cb)) {
return false;
}
putc('\n', stdout);
}
p->neg = rand_neg();
for (int j = 0; j < num2; j++) {
// construct 'a' such that it is a square modulo p, but in general not a
// proper square and not reduced modulo p
if (!BN_rand(r.get(), 256, 0, 3) ||
!BN_nnmod(r.get(), r.get(), p.get(), ctx) ||
!BN_mod_sqr(r.get(), r.get(), p.get(), ctx) ||
!BN_rand(a.get(), 256, 0, 3) ||
!BN_nnmod(a.get(), a.get(), p.get(), ctx) ||
!BN_mod_sqr(a.get(), a.get(), p.get(), ctx) ||
!BN_mul(a.get(), a.get(), r.get(), ctx)) {
return false;
}
if (rand_neg() && !BN_sub(a.get(), a.get(), p.get())) {
return false;
}
if (!BN_mod_sqrt(r.get(), a.get(), p.get(), ctx) ||
!BN_mod_sqr(r.get(), r.get(), p.get(), ctx) ||
!BN_nnmod(a.get(), a.get(), p.get(), ctx)) {
return false;
}
if (BN_cmp(a.get(), r.get()) != 0) {
fprintf(stderr, "BN_mod_sqrt failed: a = ");
BN_print_fp(stderr, a.get());
fprintf(stderr, ", r = ");
BN_print_fp(stderr, r.get());
fprintf(stderr, ", p = ");
BN_print_fp(stderr, p.get());
fprintf(stderr, "\n");
return false;
}
putc('.', stdout);
fflush(stdout);
}
putc('\n', stdout);
fflush(stderr);
}
return true;
}
static bool test_small_prime(FILE *fp, BN_CTX *ctx) {
static const int kBits = 10;
ScopedBIGNUM r(BN_new());
if (!r || !BN_generate_prime_ex(r.get(), kBits, 0, NULL, NULL, NULL)) {
return false;
}
if (BN_num_bits(r.get()) != kBits) {
fprintf(fp, "Expected %d bit prime, got %d bit number\n", kBits,
BN_num_bits(r.get()));
return false;
}
return true;
}
static bool test_sqrt(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM n(BN_new());
ScopedBIGNUM nn(BN_new());
ScopedBIGNUM sqrt(BN_new());
if (!n || !nn || !sqrt) {
return false;
}
// Test some random squares.
for (int i = 0; i < 100; i++) {
if (!BN_rand(n.get(), 1024 /* bit length */,
-1 /* no modification of top bits */,
0 /* don't modify bottom bit */) ||
!BN_mul(nn.get(), n.get(), n.get(), ctx) ||
!BN_sqrt(sqrt.get(), nn.get(), ctx)) {
ERR_print_errors_fp(stderr);
return false;
}
if (BN_cmp(n.get(), sqrt.get()) != 0) {
fprintf(stderr, "Bad result from BN_sqrt.\n");
return false;
}
}
// Test some non-squares.
for (int i = 0; i < 100; i++) {
if (!BN_rand(n.get(), 1024 /* bit length */,
-1 /* no modification of top bits */,
0 /* don't modify bottom bit */) ||
!BN_mul(nn.get(), n.get(), n.get(), ctx) ||
!BN_add(nn.get(), nn.get(), BN_value_one())) {
ERR_print_errors_fp(stderr);
return false;
}
if (BN_sqrt(sqrt.get(), nn.get(), ctx)) {
char *nn_str = BN_bn2dec(nn.get());
fprintf(stderr, "BIO_sqrt didn't fail on a non-square: %s\n", nn_str);
OPENSSL_free(nn_str);
}
}
return true;
}
static bool test_bn2bin_padded(FILE *fp, BN_CTX *ctx) {
uint8_t zeros[256], out[256], reference[128];
memset(zeros, 0, sizeof(zeros));
// Test edge case at 0.
ScopedBIGNUM n(BN_new());
if (!n || !BN_bn2bin_padded(NULL, 0, n.get())) {
fprintf(stderr,
"BN_bn2bin_padded failed to encode 0 in an empty buffer.\n");
return false;
}
memset(out, -1, sizeof(out));
if (!BN_bn2bin_padded(out, sizeof(out), n.get())) {
fprintf(stderr,
"BN_bn2bin_padded failed to encode 0 in a non-empty buffer.\n");
return false;
}
if (memcmp(zeros, out, sizeof(out))) {
fprintf(stderr, "BN_bn2bin_padded did not zero buffer.\n");
return false;
}
// Test a random numbers at various byte lengths.
for (size_t bytes = 128 - 7; bytes <= 128; bytes++) {
if (!BN_rand(n.get(), bytes * 8, 0 /* make sure top bit is 1 */,
0 /* don't modify bottom bit */)) {
ERR_print_errors_fp(stderr);
return false;
}
if (BN_num_bytes(n.get()) != bytes ||
BN_bn2bin(n.get(), reference) != bytes) {
fprintf(stderr, "Bad result from BN_rand; bytes.\n");
return false;
}
// Empty buffer should fail.
if (BN_bn2bin_padded(NULL, 0, n.get())) {
fprintf(stderr,
"BN_bn2bin_padded incorrectly succeeded on empty buffer.\n");
return false;
}
// One byte short should fail.
if (BN_bn2bin_padded(out, bytes - 1, n.get())) {
fprintf(stderr, "BN_bn2bin_padded incorrectly succeeded on short.\n");
return false;
}
// Exactly right size should encode.
if (!BN_bn2bin_padded(out, bytes, n.get()) ||
memcmp(out, reference, bytes) != 0) {
fprintf(stderr, "BN_bn2bin_padded gave a bad result.\n");
return false;
}
// Pad up one byte extra.
if (!BN_bn2bin_padded(out, bytes + 1, n.get()) ||
memcmp(out + 1, reference, bytes) || memcmp(out, zeros, 1)) {
fprintf(stderr, "BN_bn2bin_padded gave a bad result.\n");
return false;
}
// Pad up to 256.
if (!BN_bn2bin_padded(out, sizeof(out), n.get()) ||
memcmp(out + sizeof(out) - bytes, reference, bytes) ||
memcmp(out, zeros, sizeof(out) - bytes)) {
fprintf(stderr, "BN_bn2bin_padded gave a bad result.\n");
return false;
}
}
return true;
}
static int DecimalToBIGNUM(ScopedBIGNUM *out, const char *in) {
BIGNUM *raw = NULL;
int ret = BN_dec2bn(&raw, in);
out->reset(raw);
return ret;
}
static bool test_dec2bn(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM bn;
int ret = DecimalToBIGNUM(&bn, "0");
if (ret != 1 || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_dec2bn gave a bad result.\n");
return false;
}
ret = DecimalToBIGNUM(&bn, "256");
if (ret != 3 || !BN_is_word(bn.get(), 256) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_dec2bn gave a bad result.\n");
return false;
}
ret = DecimalToBIGNUM(&bn, "-42");
if (ret != 3 || !BN_abs_is_word(bn.get(), 42) || !BN_is_negative(bn.get())) {
fprintf(stderr, "BN_dec2bn gave a bad result.\n");
return false;
}
ret = DecimalToBIGNUM(&bn, "-0");
if (ret != 2 || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_dec2bn gave a bad result.\n");
return false;
}
ret = DecimalToBIGNUM(&bn, "42trailing garbage is ignored");
if (ret != 2 || !BN_abs_is_word(bn.get(), 42) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_dec2bn gave a bad result.\n");
return false;
}
return true;
}
static int HexToBIGNUM(ScopedBIGNUM *out, const char *in) {
BIGNUM *raw = NULL;
int ret = BN_hex2bn(&raw, in);
out->reset(raw);
return ret;
}
static bool test_hex2bn(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM bn;
int ret = HexToBIGNUM(&bn, "0");
if (ret != 1 || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_hex2bn gave a bad result.\n");
return false;
}
ret = HexToBIGNUM(&bn, "256");
if (ret != 3 || !BN_is_word(bn.get(), 0x256) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_hex2bn gave a bad result.\n");
return false;
}
ret = HexToBIGNUM(&bn, "-42");
if (ret != 3 || !BN_abs_is_word(bn.get(), 0x42) || !BN_is_negative(bn.get())) {
fprintf(stderr, "BN_hex2bn gave a bad result.\n");
return false;
}
ret = HexToBIGNUM(&bn, "-0");
if (ret != 2 || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_hex2bn gave a bad result.\n");
return false;
}
ret = HexToBIGNUM(&bn, "abctrailing garbage is ignored");
if (ret != 3 || !BN_is_word(bn.get(), 0xabc) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_hex2bn gave a bad result.\n");
return false;
}
return true;
}
static ScopedBIGNUM ASCIIToBIGNUM(const char *in) {
BIGNUM *raw = NULL;
if (!BN_asc2bn(&raw, in)) {
return nullptr;
}
return ScopedBIGNUM(raw);
}
static bool test_asc2bn(FILE *fp, BN_CTX *ctx) {
ScopedBIGNUM bn = ASCIIToBIGNUM("0");
if (!bn || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("256");
if (!bn || !BN_is_word(bn.get(), 256) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("-42");
if (!bn || !BN_abs_is_word(bn.get(), 42) || !BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("0x1234");
if (!bn || !BN_is_word(bn.get(), 0x1234) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("0X1234");
if (!bn || !BN_is_word(bn.get(), 0x1234) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("-0xabcd");
if (!bn || !BN_abs_is_word(bn.get(), 0xabcd) || !BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("-0");
if (!bn || !BN_is_zero(bn.get()) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
bn = ASCIIToBIGNUM("123trailing garbage is ignored");
if (!bn || !BN_is_word(bn.get(), 123) || BN_is_negative(bn.get())) {
fprintf(stderr, "BN_asc2bn gave a bad result.\n");
return false;
}
return true;
}
static bool test_rand() {
ScopedBIGNUM bn(BN_new());
if (!bn) {
return false;
}
// Test BN_rand accounts for degenerate cases with |top| and |bottom|
// parameters.
if (!BN_rand(bn.get(), 0, 0 /* top */, 0 /* bottom */) ||
!BN_is_zero(bn.get())) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
if (!BN_rand(bn.get(), 0, 1 /* top */, 1 /* bottom */) ||
!BN_is_zero(bn.get())) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
if (!BN_rand(bn.get(), 1, 0 /* top */, 0 /* bottom */) ||
!BN_is_word(bn.get(), 1)) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
if (!BN_rand(bn.get(), 1, 1 /* top */, 0 /* bottom */) ||
!BN_is_word(bn.get(), 1)) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
if (!BN_rand(bn.get(), 1, -1 /* top */, 1 /* bottom */) ||
!BN_is_word(bn.get(), 1)) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
if (!BN_rand(bn.get(), 2, 1 /* top */, 0 /* bottom */) ||
!BN_is_word(bn.get(), 3)) {
fprintf(stderr, "BN_rand gave a bad result.\n");
return false;
}
return true;
}
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