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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/fipsmodule/aes/cbc.cc.inc
// Copyright 2008-2016 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 <assert.h>
#include <string.h>
#include "internal.h"
#include "../../internal.h"
void CRYPTO_cbc128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
block128_f block) {
assert(key != nullptr && ivec != nullptr);
if (len == 0) {
// Avoid |ivec| == |iv| in the |memcpy| below, which is not legal in C.
return;
}
assert(in != nullptr && out != nullptr);
size_t n;
const uint8_t *iv = ivec;
while (len >= 16) {
CRYPTO_xor16(out, in, iv);
(*block)(out, out, key);
iv = out;
len -= 16;
in += 16;
out += 16;
}
while (len) {
for (n = 0; n < 16 && n < len; ++n) {
out[n] = in[n] ^ iv[n];
}
for (; n < 16; ++n) {
out[n] = iv[n];
}
(*block)(out, out, key);
iv = out;
if (len <= 16) {
break;
}
len -= 16;
in += 16;
out += 16;
}
OPENSSL_memcpy(ivec, iv, 16);
}
void CRYPTO_cbc128_decrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
block128_f block) {
assert(key != nullptr && ivec != nullptr);
if (len == 0) {
// Avoid |ivec| == |iv| in the |memcpy| below, which is not legal in C.
return;
}
assert(in != nullptr && out != nullptr);
const uintptr_t inptr = (uintptr_t) in;
const uintptr_t outptr = (uintptr_t) out;
// If |in| and |out| alias, |in| must be ahead.
assert(inptr >= outptr || inptr + len <= outptr);
size_t n;
alignas(16) uint8_t tmp[16];
if ((inptr >= 32 && outptr <= inptr - 32) || inptr < outptr) {
// If |out| is at least two blocks behind |in| or completely disjoint, there
// is no need to decrypt to a temporary block.
const uint8_t *iv = ivec;
while (len >= 16) {
(*block)(in, out, key);
CRYPTO_xor16(out, out, iv);
iv = in;
len -= 16;
in += 16;
out += 16;
}
OPENSSL_memcpy(ivec, iv, 16);
} else {
static_assert(16 % sizeof(crypto_word_t) == 0,
"block cannot be evenly divided into words");
while (len >= 16) {
(*block)(in, tmp, key);
for (n = 0; n < 16; n += sizeof(crypto_word_t)) {
crypto_word_t c = CRYPTO_load_word_le(in + n);
CRYPTO_store_word_le(out + n, CRYPTO_load_word_le(tmp + n) ^
CRYPTO_load_word_le(ivec + n));
CRYPTO_store_word_le(ivec + n, c);
}
len -= 16;
in += 16;
out += 16;
}
}
while (len) {
uint8_t c;
(*block)(in, tmp, key);
for (n = 0; n < 16 && n < len; ++n) {
c = in[n];
out[n] = tmp[n] ^ ivec[n];
ivec[n] = c;
}
if (len <= 16) {
for (; n < 16; ++n) {
ivec[n] = in[n];
}
break;
}
len -= 16;
in += 16;
out += 16;
}
}