dist/sbtool/EncoreBootImageReader.cpp

18 //! \post Stream head points to just after the image header.
19 //! \exception read_error Thrown if the image header is invalid.
22 	// seek to beginning of the stream/file and read the plaintext header
26 		throw read_error("failed to read image header");
48 	// check header signature 1
54 	// check header signature 2 for version 1.1 and greater
62 //! \pre The image header must have already been read with a call to readImageHeader().
73 //! \pre The image header must have already been read.
100 //! \pre The image header must have already been read with a call to readImageHeader().
103 //! \exception read_error Thrown if the image header is invalid.
126 //! \pre Image header must have been read before this method is called.
136 		EncoreBootImage::section_header_t header;
137 		if (m_stream.read((char *)&header, sizeof(header)).bad())
139 			throw read_error("failed to read section header");
142 		// swizzle section header
143 		header.m_tag = ENDIAN_LITTLE_TO_HOST_U32(header.m_tag);
144 		header.m_offset = ENDIAN_LITTLE_TO_HOST_U32(header.m_offset);
145 		header.m_length = ENDIAN_LITTLE_TO_HOST_U32(header.m_length);
146 		header.m_flags = ENDIAN_LITTLE_TO_HOST_U32(header.m_flags);
148 		m_sections.push_back(header);
158 //! \pre The image header and section table must have been read already.
174 	// first compute a CBC-MAC over the image header with our KEK
229 //! \pre Image header must have been read.
243 		EncoreBootImage::boot_command_t header;
245 		if (m_stream.read((char *)&header, sizeof(header)).bad())
250 		// swizzle to command header
251 		header.m_flags = ENDIAN_LITTLE_TO_HOST_U16(header.m_flags);
252 		header.m_address = ENDIAN_LITTLE_TO_HOST_U32(header.m_address);
253 		header.m_count = ENDIAN_LITTLE_TO_HOST_U32(header.m_count);
254 		header.m_data = ENDIAN_LITTLE_TO_HOST_U32(header.m_data);
261 			cipher.blockDecrypt((uint8_t *)&header, sizeof(header) * 8, (uint8_t *)&header);
265 		if (header.m_tag != EncoreBootImage::ROM_TAG_CMD)
270 		uint8_t checksum = calculateCommandChecksum(header);
271 		if (checksum != header.m_checksum)
277 		m_bootTags.push_back(header);
280 		bootTagOffset += header.m_count + 1; // include this boot tag in offset
281 		if (header.m_flags & EncoreBootImage::ROM_LAST_TAG || bootTagOffset >= m_header.m_imageBlocks - 2)
288 uint8_t EncoreBootImageReader::calculateCommandChecksum(EncoreBootImage::boot_command_t & header)
290 	uint8_t * bytes = reinterpret_cast<uint8_t *>(&header);
295 	for (i = 1; i < sizeof(header); ++i)
305 //! \pre Both the image header and section table must have been read already before
311 	// look up section header
313 	EncoreBootImage::section_header_t & header = m_sections[index];
316 	m_stream.seekg(sizeOfCipherBlocks(header.m_offset), std::ios_base::beg);
322 		unsigned contentLength = sizeOfCipherBlocks(header.m_length);
331 		if (isEncrypted() && (header.m_flags & EncoreBootImage::ROM_SECTION_CLEARTEXT) == 0)
340 		if (header.m_flags & EncoreBootImage::ROM_SECTION_BOOTABLE)
343 			EncoreBootImage::BootSection * bootSection = new EncoreBootImage::BootSection(header.m_tag);
345 			bootSection->fillFromData((cipher_block_t *)contents, header.m_length);
352 			EncoreBootImage::DataSection * dataSection = new EncoreBootImage::DataSection(header.m_tag);