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// Copyright (c) 2011 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 "base/sha1.h"
#include <windows.h>
#include <wincrypt.h>
// This file is not being compiled at the moment (see bug 47218). If we keep
// sha1 inside base, we cannot depend on src/crypto.
// #include "crypto/scoped_capi_types.h"
#include "base/logging.h"
namespace base {
std::string SHA1HashString(const std::string& str) {
ScopedHCRYPTPROV provider;
if (!CryptAcquireContext(provider.receive(), NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT)) {
DLOG_GETLASTERROR(ERROR) << "CryptAcquireContext failed";
return std::string(kSHA1Length, '\0');
}
{
ScopedHCRYPTHASH hash;
if (!CryptCreateHash(provider, CALG_SHA1, 0, 0, hash.receive())) {
DLOG_GETLASTERROR(ERROR) << "CryptCreateHash failed";
return std::string(kSHA1Length, '\0');
}
if (!CryptHashData(hash, reinterpret_cast<CONST BYTE*>(str.data()),
static_cast<DWORD>(str.length()), 0)) {
DLOG_GETLASTERROR(ERROR) << "CryptHashData failed";
return std::string(kSHA1Length, '\0');
}
DWORD hash_len = 0;
DWORD buffer_size = sizeof hash_len;
if (!CryptGetHashParam(hash, HP_HASHSIZE,
reinterpret_cast<unsigned char*>(&hash_len),
&buffer_size, 0)) {
DLOG_GETLASTERROR(ERROR) << "CryptGetHashParam(HP_HASHSIZE) failed";
return std::string(kSHA1Length, '\0');
}
std::string result;
if (!CryptGetHashParam(hash, HP_HASHVAL,
// We need the + 1 here not because the call will write a trailing \0,
// but so that result.length() is correctly set to |hash_len|.
reinterpret_cast<BYTE*>(WriteInto(&result, hash_len + 1)), &hash_len,
0))) {
DLOG_GETLASTERROR(ERROR) << "CryptGetHashParam(HP_HASHVAL) failed";
return std::string(kSHA1Length, '\0');
}
if (hash_len != kSHA1Length) {
DLOG(ERROR) << "Returned hash value is wrong length: " << hash_len
<< " should be " << kSHA1Length;
return std::string(kSHA1Length, '\0');
}
return result;
}
}
} // namespace base
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