mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-12-03 02:36:09 +03:00
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
#include "crypto/hmac.h"
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <algorithm>
|
|
#include <string>
|
|
|
|
#include "base/check.h"
|
|
#include "base/notreached.h"
|
|
#include "base/stl_util.h"
|
|
#include "crypto/openssl_util.h"
|
|
#include "crypto/secure_util.h"
|
|
#include "crypto/symmetric_key.h"
|
|
#include "third_party/boringssl/src/include/openssl/hmac.h"
|
|
|
|
namespace crypto {
|
|
|
|
HMAC::HMAC(HashAlgorithm hash_alg) : hash_alg_(hash_alg), initialized_(false) {
|
|
// Only SHA-1 and SHA-256 hash algorithms are supported now.
|
|
DCHECK(hash_alg_ == SHA1 || hash_alg_ == SHA256);
|
|
}
|
|
|
|
HMAC::~HMAC() {
|
|
// Zero out key copy.
|
|
key_.assign(key_.size(), 0);
|
|
base::STLClearObject(&key_);
|
|
}
|
|
|
|
size_t HMAC::DigestLength() const {
|
|
switch (hash_alg_) {
|
|
case SHA1:
|
|
return 20;
|
|
case SHA256:
|
|
return 32;
|
|
default:
|
|
NOTREACHED();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
bool HMAC::Init(const unsigned char* key, size_t key_length) {
|
|
// Init must not be called more than once on the same HMAC object.
|
|
DCHECK(!initialized_);
|
|
initialized_ = true;
|
|
key_.assign(key, key + key_length);
|
|
return true;
|
|
}
|
|
|
|
bool HMAC::Init(const SymmetricKey* key) {
|
|
return Init(key->key());
|
|
}
|
|
|
|
bool HMAC::Sign(base::StringPiece data,
|
|
unsigned char* digest,
|
|
size_t digest_length) const {
|
|
return Sign(base::as_bytes(base::make_span(data)),
|
|
base::make_span(digest, digest_length));
|
|
}
|
|
|
|
bool HMAC::Sign(base::span<const uint8_t> data,
|
|
base::span<uint8_t> digest) const {
|
|
DCHECK(initialized_);
|
|
|
|
if (digest.size() > DigestLength())
|
|
return false;
|
|
|
|
ScopedOpenSSLSafeSizeBuffer<EVP_MAX_MD_SIZE> result(digest.data(),
|
|
digest.size());
|
|
return !!::HMAC(hash_alg_ == SHA1 ? EVP_sha1() : EVP_sha256(), key_.data(),
|
|
key_.size(), data.data(), data.size(), result.safe_buffer(),
|
|
nullptr);
|
|
}
|
|
|
|
bool HMAC::Verify(base::StringPiece data, base::StringPiece digest) const {
|
|
return Verify(base::as_bytes(base::make_span(data)),
|
|
base::as_bytes(base::make_span(digest)));
|
|
}
|
|
|
|
bool HMAC::Verify(base::span<const uint8_t> data,
|
|
base::span<const uint8_t> digest) const {
|
|
if (digest.size() != DigestLength())
|
|
return false;
|
|
return VerifyTruncated(data, digest);
|
|
}
|
|
|
|
bool HMAC::VerifyTruncated(base::StringPiece data,
|
|
base::StringPiece digest) const {
|
|
return VerifyTruncated(base::as_bytes(base::make_span(data)),
|
|
base::as_bytes(base::make_span(digest)));
|
|
}
|
|
|
|
bool HMAC::VerifyTruncated(base::span<const uint8_t> data,
|
|
base::span<const uint8_t> digest) const {
|
|
if (digest.empty())
|
|
return false;
|
|
|
|
size_t digest_length = DigestLength();
|
|
if (digest.size() > digest_length)
|
|
return false;
|
|
|
|
uint8_t computed_digest[EVP_MAX_MD_SIZE];
|
|
CHECK_LE(digest.size(), size_t{EVP_MAX_MD_SIZE});
|
|
if (!Sign(data, base::make_span(computed_digest, digest.size())))
|
|
return false;
|
|
|
|
return SecureMemEqual(digest.data(), computed_digest, digest.size());
|
|
}
|
|
|
|
} // namespace crypto
|