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107 lines
2.2 KiB
C++
107 lines
2.2 KiB
C++
//
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// DigestEngine.cpp
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//
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// Library: Foundation
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// Package: Crypt
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// Module: DigestEngine
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#include "Poco/DigestEngine.h"
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#include "Poco/Format.h"
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#include "Poco/Exception.h"
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namespace Poco
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{
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DigestEngine::DigestEngine()
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{
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}
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DigestEngine::~DigestEngine()
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{
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}
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std::string DigestEngine::digestToHex(const Digest& bytes, std::size_t length)
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{
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static const char digits[] = "0123456789abcdef";
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const std::size_t fullLen = bytes.size()*2;
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std::size_t len = length ? length*2 : fullLen;
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if (len > fullLen)
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throw Poco::InvalidArgumentException(
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Poco::format("DigestEngine::digestToHex(): invalid length : %z,"
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"max alllowed is %z", length, fullLen));
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std::string result;
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result.reserve(len);
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for (auto b: bytes)
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{
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result += digits[(b >> 4) & 0xF];
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result += digits[b & 0xF];
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if (result.size() >= len) break;
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}
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return result;
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}
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DigestEngine::Digest DigestEngine::digestFromHex(const std::string& digest)
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{
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if (digest.size() % 2 != 0)
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throw DataFormatException();
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Digest result;
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result.reserve(digest.size() / 2);
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for (std::size_t i = 0; i < digest.size(); ++i)
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{
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int c = 0;
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// first upper 4 bits
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if (digest[i] >= '0' && digest[i] <= '9')
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c = digest[i] - '0';
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else if (digest[i] >= 'a' && digest[i] <= 'f')
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c = digest[i] - 'a' + 10;
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else if (digest[i] >= 'A' && digest[i] <= 'F')
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c = digest[i] - 'A' + 10;
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else
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throw DataFormatException();
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c <<= 4;
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++i;
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if (digest[i] >= '0' && digest[i] <= '9')
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c += digest[i] - '0';
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else if (digest[i] >= 'a' && digest[i] <= 'f')
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c += digest[i] - 'a' + 10;
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else if (digest[i] >= 'A' && digest[i] <= 'F')
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c += digest[i] - 'A' + 10;
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else
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throw DataFormatException();
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result.push_back(static_cast<unsigned char>(c));
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}
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return result;
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}
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bool DigestEngine::constantTimeEquals(const Digest& d1, const Digest& d2)
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{
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if (d1.size() != d2.size()) return false;
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int result = 0;
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Digest::const_iterator it1 = d1.begin();
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Digest::const_iterator it2 = d2.begin();
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Digest::const_iterator end1 = d1.end();
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while (it1 != end1)
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{
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result |= *it1++ ^ *it2++;
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}
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return result == 0;
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}
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} // namespace Poco
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