void EncoreBootImage::prepareImageHeader(boot_image_header_t & header)
{
// get identifier for the first bootable section
Section * firstBootSection = findFirstBootableSection();
section_id_t firstBootSectionID = 0;
if (firstBootSection)
{
firstBootSectionID = firstBootSection->getIdentifier();
}
// fill in header fields
header.m_signature[0] = 'S';
header.m_signature[1] = 'T';
header.m_signature[2] = 'M';
header.m_signature[3] = 'P';
header.m_majorVersion = ROM_BOOT_IMAGE_MAJOR_VERSION;
header.m_minorVersion = ROM_BOOT_IMAGE_MINOR_VERSION;
header.m_flags = ENDIAN_HOST_TO_LITTLE_U16(m_headerFlags);
header.m_imageBlocks = ENDIAN_HOST_TO_LITTLE_U32(getImageSize());
header.m_firstBootableSectionID = ENDIAN_HOST_TO_LITTLE_U32(firstBootSectionID);
header.m_keyCount = ENDIAN_HOST_TO_LITTLE_U16((uint16_t)m_keys.size());
header.m_headerBlocks = ENDIAN_HOST_TO_LITTLE_U16((uint16_t)numberOfCipherBlocks(sizeof(header)));
header.m_sectionCount = ENDIAN_HOST_TO_LITTLE_U16((uint16_t)m_sections.size());
header.m_sectionHeaderSize = ENDIAN_HOST_TO_LITTLE_U16((uint16_t)numberOfCipherBlocks(sizeof(section_header_t)));
header.m_signature2[0] = 's';
header.m_signature2[1] = 'g';
header.m_signature2[2] = 't';
header.m_signature2[3] = 'l';
header.m_timestamp = ENDIAN_HOST_TO_LITTLE_U64(getTimestamp());
header.m_driveTag = m_driveTag;
// Prepare version fields by converting them to the correct byte order.
header.m_productVersion = m_productVersion;
header.m_componentVersion = m_componentVersion;
header.m_productVersion.fixByteOrder();
header.m_componentVersion.fixByteOrder();
// the fields are dependant on others
header.m_keyDictionaryBlock = ENDIAN_HOST_TO_LITTLE_U16(header.m_headerBlocks + header.m_sectionCount * header.m_sectionHeaderSize);
header.m_firstBootTagBlock = ENDIAN_HOST_TO_LITTLE_U32(header.m_keyDictionaryBlock + header.m_keyCount * 2);
// generate random pad bytes
RandomNumberGenerator rng;
rng.generateBlock(header.m_padding0, sizeof(header.m_padding0));
rng.generateBlock(header.m_padding1, sizeof(header.m_padding1));
// compute SHA-1 digest over the image header
uint8_t * message = reinterpret_cast<uint8_t *>(&header.m_signature);
uint32_t length = static_cast<uint32_t>(sizeof(header) - sizeof(header.m_digest)); // include padding
CSHA1 hash;
hash.Reset();
hash.Update(message, length);
hash.Final();
hash.GetHash(header.m_digest);
}
//! The identifier, length, and flags fields are taken from \a section.
//!
//! \todo How does length get set correctly if the length is supposed to include
//! this command?
EncoreBootImage::TagCommand::TagCommand(const Section & section)
{
m_sectionIdentifier = section.getIdentifier();
m_sectionLength = section.getBlockCount();
m_sectionFlags = section.getFlags();
}
