/* * Copyright (C) 2017 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "CommonCryptoDERUtilities.h" #if ENABLE(SUBTLE_CRYPTO) namespace WebCore { size_t bytesUsedToEncodedLength(uint8_t octet) { if (octet < MaxLengthInOneByte) return 1; return octet - MaxLengthInOneByte + 1; } size_t extraBytesNeededForEncodedLength(size_t length) { if (!length) return 0; size_t result = 1; while (result < sizeof(length) && length >= (1 << (result * 8))) result += 1; return result; } void addEncodedASN1Length(Vector<uint8_t>& in, size_t length) { if (length < MaxLengthInOneByte) { in.append(length); return; } size_t extraBytes = extraBytesNeededForEncodedLength(length); in.append(128 + extraBytes); // 128 is used to set the first bit of this byte. size_t lastPosition = in.size() + extraBytes - 1; in.grow(in.size() + extraBytes); for (size_t i = 0; i < extraBytes; i++) { in[lastPosition - i] = length & 0xff; length = length >> 8; } } size_t bytesNeededForEncodedLength(size_t length) { if (length < MaxLengthInOneByte) return 1; return 1 + extraBytesNeededForEncodedLength(length); } } // namespace WebCore #endif // ENABLE(SUBTLE_CRYPTO)