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Simple HTTP client with HTTP/1.1, HTTP/2, and HTTP/3 support
Security advisory:
This version has known vulnerabilities.
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c_src/boringssl/crypto/bn/div.cc
// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <openssl/bn.h>
#include <openssl/err.h>
#include "../fipsmodule/bn/internal.h"
#include "../internal.h"
int BN_mod_pow2(BIGNUM *r, const BIGNUM *a, size_t e) {
if (e == 0 || a->width == 0) {
BN_zero(r);
return 1;
}
size_t num_words = 1 + ((e - 1) / BN_BITS2);
// If |a| definitely has less than |e| bits, just BN_copy.
if ((size_t)a->width < num_words) {
return BN_copy(r, a) != nullptr;
}
// Otherwise, first make sure we have enough space in |r|.
// Note that this will fail if num_words > INT_MAX.
if (!bn_wexpand(r, num_words)) {
return 0;
}
// Copy the content of |a| into |r|.
OPENSSL_memcpy(r->d, a->d, num_words * sizeof(BN_ULONG));
// If |e| isn't word-aligned, we have to mask off some of our bits.
size_t top_word_exponent = e % (sizeof(BN_ULONG) * 8);
if (top_word_exponent != 0) {
r->d[num_words - 1] &= (((BN_ULONG)1) << top_word_exponent) - 1;
}
// Fill in the remaining fields of |r|.
r->neg = a->neg;
r->width = (int)num_words;
bn_set_minimal_width(r);
return 1;
}
int BN_nnmod_pow2(BIGNUM *r, const BIGNUM *a, size_t e) {
if (!BN_mod_pow2(r, a, e)) {
return 0;
}
// If the returned value was non-negative, we're done.
if (BN_is_zero(r) || !r->neg) {
return 1;
}
size_t num_words = 1 + (e - 1) / BN_BITS2;
// Expand |r| to the size of our modulus.
if (!bn_wexpand(r, num_words)) {
return 0;
}
// Clear the upper words of |r|.
OPENSSL_memset(&r->d[r->width], 0, (num_words - r->width) * BN_BYTES);
// Set parameters of |r|.
r->neg = 0;
r->width = (int)num_words;
// Now, invert every word. The idea here is that we want to compute 2^e-|x|,
// which is actually equivalent to the twos-complement representation of |x|
// in |e| bits, which is -x = ~x + 1.
for (int i = 0; i < r->width; i++) {
r->d[i] = ~r->d[i];
}
// If our exponent doesn't span the top word, we have to mask the rest.
size_t top_word_exponent = e % BN_BITS2;
if (top_word_exponent != 0) {
r->d[r->width - 1] &= (((BN_ULONG)1) << top_word_exponent) - 1;
}
// Keep the minimal-width invariant for |BIGNUM|.
bn_set_minimal_width(r);
// Finally, add one, for the reason described above.
return BN_add(r, r, BN_value_one());
}