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encryption-zynqmp.cpp
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/******************************************************************************
* Copyright 2015-2020 Xilinx, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
/*
------------------------------------------------------------------------------------------------
**************************************************************** H E A D E R F I L E S ***
------------------------------------------------------------------------------------------------
*/
#include "encryption-zynqmp.h"
#include "bootimage.h"
#include "encryptutils.h"
#include "options.h"
#include "encryptutils.h"
#include "fileutils.h"
#include <openssl/rand.h>
#include "obfskutil.h"
/*
------------------------------------------------------------------------------------------------
********************************************************************** F U N C T I O N S ***
------------------------------------------------------------------------------------------------
*/
/******************************************************************************/
ZynqMpEncryptionContext::ZynqMpEncryptionContext()
: isBootloader(false)
, aesSeedexits(false)
, partNum(0)
{
encryptionAlgorithm = new AesGcmEncryptionContext();
};
/******************************************************************************/
ZynqMpEncryptionContext::ZynqMpEncryptionContext(const EncryptionContext* other)
: isBootloader(false)
, aesSeedexits(false)
, partNum(0)
{
aesFilename = other->aesFilename;
encryptionAlgorithm = new AesGcmEncryptionContext();
}
/******************************************************************************/
ZynqMpEncryptionContext::~ZynqMpEncryptionContext()
{
if (encryptionAlgorithm)
{
delete encryptionAlgorithm;
}
if (aesKey)
{
delete aesKey;
}
if (aesIv)
{
delete aesIv;
}
if (aesSeed)
{
delete aesSeed;
}
if (aesContext)
{
delete aesContext;
}
if (aesLabel)
{
delete aesLabel;
}
if (outBufKDF)
{
delete outBufKDF;
}
if (kI)
{
delete kI;
}
if (fixedInputData)
{
delete fixedInputData;
}
if (verifyKo)
{
delete verifyKo;
}
};
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesKey(const uint8_t* key)
{
aesKey = new uint32_t[WORDS_PER_AES_KEY];
for (uint32_t index = 0; index < WORDS_PER_AES_KEY; index++)
{
aesKey[index] = ReadBigEndian32(key);
key += sizeof(uint32_t);
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesSeedString(const std::string& key)
{
uint8_t hexData[256];
if (key.size() != (WORDS_PER_AES_KEY * 8))
{
LOG_DEBUG(DEBUG_STAMP, "Seed size - %d", key.size());
LOG_ERROR("An AES Seed must be 256 bits long - %s", key.c_str());
}
PackHex(key, hexData);
SetAesSeed(hexData);
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesLabelString(const std::string& key)
{
uint8_t* hexData = new uint8_t[key.size()];
PackHex(key, hexData);
SetAesLabel(hexData, key.size() / 2);
delete[] hexData;
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesContextString(const std::string& key)
{
uint8_t* hexData = new uint8_t[key.size()];
PackHex(key, hexData);
SetAesContext(hexData, key.size() / 2);
delete[] hexData;
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesFixedInputDataString(const std::string& key)
{
if (key.size() / 2 != 60)
{
LOG_DEBUG(DEBUG_STAMP, "Fixed Input Data size - %d", key.size() / 2);
LOG_ERROR("An AES Fixed Input Data must be 60 Bytes long - %s", key.c_str());
}
uint8_t* hexData = new uint8_t[key.size()];
PackHex(key, hexData);
SetAesFixedInputData(hexData, key.size() / 2);
delete[] hexData;
}
/******************************************************************************/
void ZynqMpEncryptionContext::GenerateAesKey(void)
{
uint32_t keysize = WORDS_PER_AES_KEY * sizeof(uint32_t);
uint8_t newKey[BYTES_PER_AES_KEY];
RAND_bytes(newKey, keysize);
SetAesKey(newKey);
LOG_INFO("AES Key generated successfully");
}
/******************************************************************************/
void ZynqMpEncryptionContext::GetEncryptionKeys(Options& options, uint8_t* aesKey, uint8_t* aesOptKey, uint8_t* aesIV)
{
const uint32_t* tmpKey = GetAesKey();
if (tmpKey != NULL)
{
memcpy_be(aesKey, tmpKey, AES_GCM_KEY_SZ);
}
else
{
LOG_ERROR("Encryption Error !!!\n Key 0 does not exist in the AES key file ");
}
if (options.bifOptions->GetAesOptKeyFlag())
{
const uint32_t* tmpOptKey = GetAesOptKey();
if (tmpOptKey != NULL)
{
memcpy_be(aesOptKey, tmpOptKey, AES_GCM_KEY_SZ);
}
else
{
LOG_ERROR("Encryption Error !!!\n Operational Key 'Key Opt' does not exist in the AES key file ");
}
}
const uint32_t* tmpIv = GetIv();
if (tmpIv != NULL)
{
memcpy_be(aesIV, tmpIv, AES_GCM_IV_SZ);
}
else
{
LOG_ERROR("IV does not exist in the AES key file ");
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::WriteEncryptionKeyFile(const std::string & baseFileName, bool useOptionalKey, uint32_t blocks)
{
uint32_t x, y, index;
/* Setup the file for writing */
std::string ext = StringUtils::GetExtension(baseFileName);
std::string filename;
if (ext == "")
{
filename = baseFileName + ".nky";
}
else
{
filename = baseFileName;
}
std::ofstream keyFile(filename.c_str());
if (!keyFile)
{
LOG_ERROR("Failure writing AES key file", filename.c_str());
}
/* Write device name */
if (deviceName != "")
{
keyFile << "Device " << deviceName << ";\n";
keyFile << "\n";
}
/* Ko can then be used for key/iv pairs */
for (x = 0; x < blocks; x++)
{
keyFile << "Key " << std::dec << x;
keyFile << " ";
if (x == 0 && GetAesKey() != NULL) {
for (index = 0; index < WORDS_PER_AES_KEY; ++index)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << aesKey[index];
}
}
else {
for (y = 0; y < WORDS_PER_AES_KEY; y++)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << outBufKDF[11 * x + y];
}
}
keyFile << ";\n";
keyFile << "IV " << std::dec << x;
keyFile << " ";
if (x == 0 && GetIv() != NULL) {
for (y = 0; y < WORDS_PER_IV; ++y)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << aesIv[y];
}
}
else {
for (y = WORDS_PER_AES_KEY; y < WORDS_PER_AES_KEY + WORDS_PER_IV; y++)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << outBufKDF[11 * x + y];
}
}
keyFile << ";\n";
keyFile << "\n";
}
if (useOptionalKey == true)
{
keyFile << "Key Opt ";
if (GetAesOptKey() != NULL) {
for (y = 0; y < WORDS_PER_AES_KEY; ++y)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << aesOptKey[y];
}
}
else {
for (y = 0; y < WORDS_PER_AES_KEY; y++)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << outBufKDF[11 * x + y];
}
}
keyFile << ";\n";
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::ReadEncryptionKeyFile(const std::string& inputFileName)
{
LOG_TRACE("Reading the AES key file");
int aesKeyNum = 0;
int aesIvNum = 0;
// Get the encryption key file name
std::ifstream keyFile(inputFileName.c_str());
aesKeyVec.clear();
aesIvVec.clear();
if (!keyFile)
{
LOG_ERROR("Failure reading AES key file - %s", inputFileName.c_str());
}
while (keyFile)
{
std::string word;
keyFile >> word;
// If file vacant
if (word == "")
{
return;
}
char c = ' ';
// First Word is "Key"
if (word == "Key")
{
keyFile >> word;
// Second Word is "Opt"
if (word == "Opt")
{
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
if (word == "pick")
{
GenerateAesOptKey();
}
else
{
SetAesOptKeyString(word);
}
}
// Second Word is "0"
else if (word != "" && isalnum(word[0]))
{
int index = std::stoi(word);
if (aesKeyNum != index)
{
LOG_DEBUG(DEBUG_STAMP, "Key order incorrect.");
LOG_ERROR("Error parsing AES key file - %s.", inputFileName.c_str());
}
aesKeyNum++;
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
// Third Word is "pick" - then generate AES key, otherwise set the key specified
if (word == "pick")
{
GenerateAesKey();
}
else
{
if (aesKeyVec.size() == 0)
{
SetAesKeyString(word);
}
aesKeyVec.push_back(word);
}
}
// Second Word other than "0", "StartCBC" or "HMAC" - throw error
else
{
LOG_DEBUG(DEBUG_STAMP, "Unknown key type - '%s' in %s", word.c_str(), inputFileName.c_str());
LOG_ERROR("Error parsing AES key file - %s", inputFileName.c_str());
}
}
// If first word is not "Key" but "Device"
else if (word == "Device")
{
word = "";
keyFile >> word;
/*while( (keyFile >> c) && (isalnum(c) || c=='-' || c=='_') )
{
word.push_back(c);
}*/
c = word[word.size() - 1];
word.erase(word.size() - 1);
deviceName = word;
}
else if (word == "IV")
{
keyFile >> word;
if (word != "")
{
if (word.size() == ((BYTES_PER_IV * 2) + 1))
{
c = word[word.size() - 1];
word.erase(word.size() - 1);
SetIvString(word);
}
else
{
int index = std::stoi(word);
if (aesIvNum != index)
{
LOG_DEBUG(DEBUG_STAMP, "Iv order incorrect.");
LOG_ERROR("Error parsing AES key file - %s.", inputFileName.c_str());
}
aesIvNum++;
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
if (word == "pick")
{
GenerateIv();
}
else
{
if (aesIvVec.size() == 0)
{
SetIvString(word);
}
}
}
aesIvVec.push_back(word);
}
}
else if (word == "Seed")
{
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
SetAesSeedString(word);
aesSeedexits = true;
}
else if (word == "Label")
{
LOG_WARNING("The input 'Label' is deprecated.\n\t Please construct a FixedInputData of 60 Bytes instead and provide the same in the nky file.This will be used along with Seed in KDF.");
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
SetAesLabelString(word);
}
else if (word == "Context")
{
LOG_WARNING("The input 'Context' is deprecated.\n\t Please construct a FixedInputData of 60 Bytes instead and provide the same in the nky file.This will be used along with Seed in KDF.");
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
SetAesContextString(word);
}
else if (word == "FixedInputData")
{
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
SetAesFixedInputDataString(word);
fixedInputDataExits = true;
}
// If first word is neither "Key" nor "Device"
else
{
LOG_DEBUG(DEBUG_STAMP, "'Key' or 'Device' identifier expected, '%s' found instead", word.c_str());
LOG_ERROR("Error parsing AES key file - %s", inputFileName.c_str());
}
// Semicolons expected at end of every line
if (c != ';')
{
while ((keyFile >> c) && isspace(c))
{
word.push_back(c);
}
}
if (c != ';')
{
LOG_DEBUG(DEBUG_STAMP, "Terminating ';' expected. Last word read was '%s'", word.c_str());
LOG_ERROR("Error parsing AES key file - %s", inputFileName.c_str());
}
if (deviceName == "")
{
LOG_DEBUG(DEBUG_STAMP, "Partname 'Device' missing in the key file - %s", inputFileName.c_str());
LOG_ERROR("Error parsing AES key file - %s", inputFileName.c_str());
}
if ((aesKeyVec.size() > 1 || aesIvVec.size() > 1) && aesSeedexits)
{
LOG_ERROR("Seed is not expected with multiple keys/Iv.");
}
if (fixedInputDataExits && !aesSeedexits)
{
LOG_ERROR("Seed must be specified along with FixedInputData.");
}
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::PackNextEncryptionKey(uint8_t* aesKeyNext, int aeskeyPtr)
{
uint8_t hexData[AES_GCM_KEY_SZ];
uint8_t* hexDataPtr = hexData;
if (aesKeyVec[aeskeyPtr].length() != (WORDS_PER_AES_KEY * 8))
{
LOG_DEBUG(DEBUG_STAMP, "AES key %d size - %d", aeskeyPtr, aesKeyVec[aeskeyPtr].length());
LOG_ERROR("An AES key must be 256 bits long - %s", aesKeyVec[aeskeyPtr].c_str());
}
if (aesKeyVec[aeskeyPtr].length() & 1)
{
LOG_DEBUG(DEBUG_STAMP, "Hex String - %s - does not have even no. of hex digits", aesKeyVec[aeskeyPtr].c_str());
LOG_ERROR("Error parsing encryption key");
}
for (uint32_t i = 0; i<aesKeyVec[aeskeyPtr].length(); i += 2)
{
std::string byte = aesKeyVec[aeskeyPtr].substr(i, 2);
if (!isxdigit(byte[0]) || !isxdigit(byte[1]))
{
LOG_DEBUG(DEBUG_STAMP, "Hex String - %s - is has a non hex digit", aesKeyVec[aeskeyPtr].c_str());
LOG_ERROR("Error parsing encryption key");
}
*hexDataPtr++ = (uint8_t)strtoul(byte.c_str(), NULL, 16);
}
hexDataPtr = hexData;
memcpy(aesKeyNext, hexDataPtr, AES_GCM_KEY_SZ);
}
/******************************************************************************/
void ZynqMpEncryptionContext::PackNextIv(uint8_t* aesIVNext, int aesIvPtr)
{
uint8_t hexData[AES_GCM_IV_SZ];
uint8_t* hexDataPtr = hexData;
if (aesIvVec[aesIvPtr].length() != (BYTES_PER_IV * 2))
{
LOG_DEBUG(DEBUG_STAMP, "IV[%d] Size = %d", aesIvPtr, aesIvVec[aesIvPtr].length());
LOG_ERROR("Encryption Error !!!\n An IV key must be 12 bytes long");
}
if (aesIvVec[aesIvPtr].length() & 1)
{
LOG_DEBUG(DEBUG_STAMP, "Hex String - %s - does not have even no. of hex digits", aesIvVec[aesIvPtr].c_str());
LOG_ERROR("Error parsing encryption key");
}
for (uint32_t i = 0; i<aesIvVec[aesIvPtr].length(); i += 2)
{
std::string byte = aesIvVec[aesIvPtr].substr(i, 2);
if (!isxdigit(byte[0]) || !isxdigit(byte[1]))
{
LOG_DEBUG(DEBUG_STAMP, "Hex String - %s - is has a non hex digit", aesIvVec[aesIvPtr].c_str());
LOG_ERROR("Error parsing encryption key");
}
*hexDataPtr++ = (uint8_t)strtoul(byte.c_str(), NULL, 16);
}
hexDataPtr = hexData;
memcpy(aesIVNext, hexDataPtr, BYTES_PER_IV);
}
/******************************************************************************/
void ZynqMpEncryptionContext::GetNextKey(uint8_t * keyNext, int ptr)
{
PackNextEncryptionKey(keyNext, ptr);
}
/******************************************************************************/
void ZynqMpEncryptionContext::GetNextIv(uint8_t * keyNext, int ptr)
{
PackNextIv(keyNext, ptr);
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesSeed(const uint8_t* key)
{
aesSeed = new uint32_t[WORDS_PER_AES_KEY];
for (uint32_t index = 0; index < WORDS_PER_AES_KEY; index++)
{
aesSeed[index] = ReadBigEndian32(key);
key += sizeof(uint32_t);
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesLabel(const uint8_t* key, int bytes)
{
aesLabelBytes = bytes;
aesLabel = new uint8_t[aesLabelBytes];
for (int index = 0; index<aesLabelBytes; index++)
{
aesLabel[index] = key[index];
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesContext(const uint8_t* key, int bytes)
{
aesContextBytes = bytes;
aesContext = new uint8_t[aesContextBytes];
for (int index = 0; index<aesContextBytes; index++)
{
aesContext[index] = key[index];
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesFixedInputData(const uint8_t* key, int bytes)
{
fixedInputData = new uint8_t[bytes];
fixedInputDataByteLength = bytes;
for (int index = 0; index<bytes; index++)
{
fixedInputData[index] = key[index];
}
}
/******************************************************************************/
const uint32_t* ZynqMpEncryptionContext::GetAesSeed(void)
{
return (uint32_t *)aesSeed;
}
/******************************************************************************/
const uint8_t*ZynqMpEncryptionContext::GetAesLabel(void)
{
return (uint8_t *)aesLabel;
}
/******************************************************************************/
const uint8_t* ZynqMpEncryptionContext::GetAesContext(void)
{
return (uint8_t *)aesContext;
}
/******************************************************************************/
const uint32_t * ZynqMpEncryptionContext::GetAesKey(void)
{
return (uint32_t *)aesKey;
}
/******************************************************************************/
const uint32_t* ZynqMpEncryptionContext::GetAesOptKey(void)
{
return (uint32_t *)aesOptKey;
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesOptKey(const uint8_t* key)
{
aesOptKey = new uint32_t[WORDS_PER_AES_KEY];
for (uint32_t index = 0; index < WORDS_PER_AES_KEY; index++)
{
aesOptKey[index] = ReadBigEndian32(key);
key += sizeof(uint32_t);
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetAesOptKeyString(const std::string& key)
{
uint8_t hexData[256];
if (key.size() != (WORDS_PER_AES_KEY * 8))
{
LOG_DEBUG(DEBUG_STAMP, "AES key size - %d", key.size());
LOG_ERROR("An AES key must be 256 bits long - %s", key.c_str());
}
PackHex(key, hexData);
SetAesOptKey(hexData);
}
/******************************************************************************/
void ZynqMpEncryptionContext::GenerateAesOptKey(void)
{
uint32_t keysize = WORDS_PER_AES_KEY * sizeof(uint32_t);
uint8_t newKeyData[BYTES_PER_AES_KEY];
// Get temp data to encrypt as the newKey.
RAND_bytes(newKeyData, keysize);
// Set the new key.
SetAesOptKey(newKeyData);
// For logging purpose
LOG_INFO("AES Key generated successfully");
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetIv(const uint8_t* iv)
{
aesIv = new uint32_t[WORDS_PER_IV];
// Copy the key
for (uint32_t index = 0; index < WORDS_PER_IV; index++)
{
aesIv[index] = ReadBigEndian32(iv);
iv += sizeof(uint32_t);
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::SetIvString(const std::string& IV)
{
uint8_t hexData[256];
if (IV.size() != (BYTES_PER_IV * 2))
{
LOG_DEBUG(DEBUG_STAMP, "IV = %s, IV Size = %d", IV.c_str(), IV.size());
LOG_ERROR("Encryption Error !!!\n An IV key must be 12 bytes long");
}
PackHex(IV, hexData);
SetIv(hexData);
}
/******************************************************************************/
void ZynqMpEncryptionContext::GenerateIv(void)
{
// Get temp data to encrypt as the newCBC.
uint8_t newIVData[BYTES_PER_IV];
RAND_bytes(newIVData, BYTES_PER_IV);
SetIv(newIVData);
// For logging purpose
LOG_INFO("AES IV generated successfully");
}
/******************************************************************************/
const uint32_t* ZynqMpEncryptionContext::GetIv(void)
{
return (uint32_t *)aesIv;
}
/******************************************************************************/
void ZynqMpEncryptionContext::GenerateRemainingKeys(Options& options, std::string aesFilename)
{
uint32_t blocks, x;
bool useOptionalKey = false;
if (GetAesOptKey() == NULL)
{
useOptionalKey = options.bifOptions->GetAesOptKeyFlag();
}
if (GetAesKey() == NULL && !aesSeedexits)
{
LOG_ERROR("Encryption Error !!!\n Key 0 does not exist in the AES key file ");
}
if (options.bifOptions->GetAesOptKeyFlag())
{
if (GetAesOptKey() == NULL && !aesSeedexits)
{
LOG_ERROR("Encryption Error !!!\n Operational Key 'Key Opt' does not exist in the AES key file ");
}
}
if (GetIv() == NULL && !aesSeedexits)
{
LOG_ERROR("IV does not exist in the AES key file ");
}
if (aesKeyVec.size() != aesIvVec.size())
{
LOG_ERROR("Encryption Error !!!\n Number of Keys in the AES key file are not equal to the number of IVs. ");
}
// If only seed exists in the given in nky file => No key0/iv0 mentioned. +1 to generate key0/IV0 for SH
if (GetAesKey() == NULL && aesSeedexits)
{
blocks = options.bifOptions->GetEncryptionBlocksList().size() + 1 + useOptionalKey;
LOG_TRACE("Keys for encryption will be generated based on the seed");
}
else
{
blocks = options.bifOptions->GetEncryptionBlocksList().size() + useOptionalKey;
if (aesSeedexits)
{
LOG_TRACE("Keys for encryption will be generated based on the seed");
}
else
{
LOG_TRACE("Keys for encryption will be generated based on Key 0");
}
}
CounterModeKDF(blocks, aesFilename, options.GetEncryptionDumpFlag());
uint8_t aesKeyNext[AES_GCM_KEY_SZ];
uint8_t aesIvNext[AES_GCM_IV_SZ];
for (x = 0; x<blocks; x++)
{
memcpy(aesKeyNext, &outBufKDF[(x * 11)], AES_GCM_KEY_SZ);
aesKeyVec.push_back(ConvertKeyIvToString(aesKeyNext, AES_GCM_KEY_SZ).c_str());
if (GetAesKey() == NULL)
{
SetAesKey(aesKeyNext);
}
memcpy(aesIvNext, &outBufKDF[(x * 11) + WORDS_PER_AES_KEY], AES_GCM_IV_SZ);
aesIvVec.push_back(ConvertKeyIvToString(aesIvNext, AES_GCM_IV_SZ).c_str());
if (GetIv() == NULL)
{
SetIv(aesIvNext);
}
}
if (useOptionalKey == true)
{
if (GetAesOptKey() == NULL)
{
SetAesOptKey(aesKeyNext);
}
}
}
/******************************************************************************/
void ZynqMpEncryptionContext::ChunkifyAndEncrypt(Options& options, const uint8_t *inBuf, uint32_t inLen, uint8_t* outBuf, uint32_t& outLen)
{
std::vector<uint32_t> blockList = options.bifOptions->GetEncryptionBlocksList();
uint8_t *aesIv = new uint8_t[AES_GCM_IV_SZ];
uint8_t *aesKey = new uint8_t[AES_GCM_KEY_SZ];
uint8_t *aesOptKey = new uint8_t[AES_GCM_KEY_SZ];
uint8_t *aesIVNext = new uint8_t[AES_GCM_IV_SZ];
uint8_t *aesKeyNext = new uint8_t[AES_GCM_KEY_SZ];
GetEncryptionKeys(options, aesKey, aesOptKey, aesIv);
GetNextKey(aesKeyNext, 1);
GetNextIv(aesIVNext, 1);
if (partNum > 0) {
uint8_t *x = new uint8_t[AES_GCM_IV_SZ];
memset(x, 0, AES_GCM_IV_SZ);
*(x + AES_GCM_IV_SZ - 1) = partNum;
*(aesIv + AES_GCM_IV_SZ - 1) = *(aesIv + AES_GCM_IV_SZ - 1) + *(x + AES_GCM_IV_SZ - 1);
delete[] x;
}
// Extract the first block size
uint32_t nextBlkSize = (blockList.empty()) ? inLen : blockList[0];
nextBlkSize = (nextBlkSize > inLen) ? inLen : nextBlkSize + 0;
uint8_t secureHdr_in[AES_GCM_KEY_SZ + AES_GCM_IV_SZ + NUM_BYTES_PER_WORD];
uint32_t charZero = 0;
if (options.bifOptions->GetAesOptKeyFlag())
{
//Write the optional key from .nky file
memcpy(secureHdr_in, aesOptKey, AES_GCM_KEY_SZ);
if (isBootloader == false)
{
/* If optional key is enabled, then aesKey (boot key) needs to be used only encrypt the secure header
Next block is encrypted using Opt Key.
For all partitions, other than bootloader, don't use aesKey (bootkey), always use optional key
Reason: The main idea to use optional key is to minimize the time of bootkey usage during booting process */
memcpy(aesKey, aesOptKey, AES_GCM_KEY_SZ);
memset(secureHdr_in, 0, AES_GCM_KEY_SZ);
memcpy(secureHdr_in, aesKeyNext, AES_GCM_KEY_SZ);
}
}
else
{
/*Security Vulnerability : Reusing same AES / IV Key Pair*/
//Write Dummy key
memset(secureHdr_in, charZero, AES_GCM_KEY_SZ);
//Write Next key
if (isBootloader == false)
{
memcpy(secureHdr_in, aesKeyNext, AES_GCM_KEY_SZ);
}
}
// Block 0 IV(random generated), and the Block0 word size
memcpy(secureHdr_in + AES_GCM_KEY_SZ, aesIVNext, AES_GCM_IV_SZ);
WriteLittleEndian32(secureHdr_in + AES_GCM_KEY_SZ + AES_GCM_IV_SZ, nextBlkSize / NUM_BYTES_PER_WORD);
int ct_len;
uint8_t gcm_tag[AES_GCM_TAG_SZ];
/* Encrypt the Secure Header with device key and starting IV */
LOG_TRACE("Encrypting the Secure Header");
uint8_t* ptr = outBuf;
encryptionAlgorithm->AesGcm256Encrypt(secureHdr_in, SECURE_HDR_SZ, aesKey, aesIv, NULL, 0, ptr, ct_len, gcm_tag);
/* Attach the AES-GCM generated Hash Tag to end of the block */
memcpy(outBuf + ct_len, gcm_tag, AES_GCM_TAG_SZ);
uint32_t outPtr = ct_len + AES_GCM_TAG_SZ;
uint8_t secureHdr_out[1024];
int pt_len;
uint32_t length = 0;
if (options.GetEncryptionDumpFlag())
{
uint32_t i = 0;
VERBOSE_OUT << std::endl << " Secure Header";
VERBOSE_OUT << std::endl << " AES Key : ";
for (i = 0; i<AES_GCM_KEY_SZ; i++)
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << uint32_t(aesKey[i]);
VERBOSE_OUT << std::endl << " AES IV : ";
for (i = 0; i<AES_GCM_IV_SZ; i++)
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << uint32_t(aesIv[i]);
VERBOSE_OUT << std::endl << " Length : ";
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << SECURE_HDR_SZ;
VERBOSE_OUT << std::endl << " Next Key, IV and length stored in Secure Header: ";
VERBOSE_OUT << std::endl << " Next Key : ";
for (i = 0; i<AES_GCM_KEY_SZ; i++)
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << uint32_t(secureHdr_in[i]);
VERBOSE_OUT << std::endl << " Next IV : ";
for (i = 0; i<AES_GCM_IV_SZ; i++)
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << uint32_t(secureHdr_in[i + AES_GCM_KEY_SZ]);
VERBOSE_OUT << std::endl << " Length : ";
length = ReadLittleEndian32(secureHdr_in + AES_GCM_KEY_SZ + AES_GCM_IV_SZ);
VERBOSE_OUT << std::hex << length * 4;
/*
VERBOSE_OUT << std::endl << " GCM Tag : ";
for (i = 0; i<AES_GCM_TAG_SZ; i++)
VERBOSE_OUT << std::setfill('0') << std::setw(2) << std::hex << uint32_t(gcm_tag[i]);
VERBOSE_OUT << std::endl;
*/
//AES-GCM Decryption for verification purpose
encryptionAlgorithm->AesGcm256Decrypt(secureHdr_out, pt_len, aesKey, aesIv, NULL, 0, outBuf, SECURE_HDR_SZ, gcm_tag);
int ret = memcmp(secureHdr_in, secureHdr_out, SECURE_HDR_SZ);
if (ret == 0)
{
//VERBOSE_OUT << " Encrypted secure header was successfully decrypted and tag matched\n";
}
}
uint32_t bytesWritten = 0;
uint32_t inPtr = 0;
uint32_t blkPtr = 1;
//Take the next random generated IV for encryption
/* Secure Header and Block 0 will be using the same IV, to have equal number of Keys
and IVs from Key File. */
/*Security Vulnerability : Reusing same AES / IV Key Pair*/
memcpy(aesIv, aesIVNext, AES_GCM_IV_SZ);
if (options.bifOptions->GetAesOptKeyFlag())
{
if (isBootloader == false)
{
memcpy(aesKey, aesKeyNext, AES_GCM_KEY_SZ);
}
else
{
memcpy(aesKey, aesOptKey, AES_GCM_KEY_SZ);
}
}
else
{
if (isBootloader == false)
{
memcpy(aesKey, aesKeyNext, AES_GCM_KEY_SZ);
}
}
while (bytesWritten < inLen)
{
//Update the block size for current block and extract the next block size
uint32_t currBlkSize = nextBlkSize;
bytesWritten += currBlkSize;
nextBlkSize = (blockList.size() > blkPtr) ? blockList[blkPtr] : inLen - bytesWritten;
nextBlkSize = ((nextBlkSize + bytesWritten) > inLen) ? (inLen - bytesWritten) : (nextBlkSize + 0);
/* Get next key and IV(random for next key from keyfile) for next block */
if (nextBlkSize == 0)
{
memset(aesKeyNext, 0, AES_GCM_KEY_SZ);