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encryption-zynq.cpp
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/******************************************************************************
* Copyright 2015-2022 Xilinx, Inc.
* Copyright 2022-2023 Advanced Micro Devices, 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 <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <ctype.h>
#include <fstream>
#include <string>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include "encryption-zynq.h"
#include "bootimage.h"
#include "encryptutils.h"
#include "options.h"
#include "bifoptions.h"
#include "encryptutils.h"
#include "fileutils.h"
#include "stringutils.h"
#include "bootgenexception.h"
#include "systemutils.h"
/*
-------------------------------------------------------------------------------
********************************************* P R E P R O C E S S O R S ***
-------------------------------------------------------------------------------
*/
#define BITS_PER_SHA_BLOCK 512
#define BYTE_PER_SHA_BLOCK 64
#define WORDS_PER_CBC_KEY 4
#define BYTES_PER_CBC_KEY 16
#define WORDS_PER_HMAC_KEY 8
#define BYTES_PER_HMAC_KEY 32
#define HMAC_IPAD_BYTE 0x36
#define HMAC_OPAD_BYTE 0x5C
#define BIT_STREAM_NOOP_COMMAND 0x20000000
static const uint32_t round_constant[30] =
{
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f,
0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4,
0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91
};
static const uint8_t s_box[16][16] =
{
{ 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76 },
{ 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0 },
{ 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15 },
{ 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75 },
{ 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84 },
{ 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF },
{ 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8 },
{ 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2 },
{ 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73 },
{ 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB },
{ 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79 },
{ 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08 },
{ 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A },
{ 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E },
{ 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF },
{ 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 }
};
static const uint32_t Logtable[256] =
{
0, 0, 25, 1, 50, 2, 26, 198, 75, 199, 27, 104, 51, 238, 223, 3,
100, 4, 224, 14, 52, 141, 129, 239, 76, 113, 8, 200, 248, 105, 28, 193,
125, 194, 29, 181, 249, 185, 39, 106, 77, 228, 166, 114, 154, 201, 9, 120,
101, 47, 138, 5, 33, 15, 225, 36, 18, 240, 130, 69, 53, 147, 218, 142,
150, 143, 219, 189, 54, 208, 206, 148, 19, 92, 210, 241, 64, 70, 131, 56,
102, 221, 253, 48, 191, 6, 139, 98, 179, 37, 226, 152, 34, 136, 145, 16,
126, 110, 72, 195, 163, 182, 30, 66, 58, 107, 40, 84, 250, 133, 61, 186,
43, 121, 10, 21, 155, 159, 94, 202, 78, 212, 172, 229, 243, 115, 167, 87,
175, 88, 168, 80, 244, 234, 214, 116, 79, 174, 233, 213, 231, 230, 173, 232,
44, 215, 117, 122, 235, 22, 11, 245, 89, 203, 95, 176, 156, 169, 81, 160,
127, 12, 246, 111, 23, 196, 73, 236, 216, 67, 31, 45, 164, 118, 123, 183,
204, 187, 62, 90, 251, 96, 177, 134, 59, 82, 161, 108, 170, 85, 41, 157,
151, 178, 135, 144, 97, 190, 220, 252, 188, 149, 207, 205, 55, 63, 91, 209,
83, 57, 132, 60, 65, 162, 109, 71, 20, 42, 158, 93, 86, 242, 211, 171,
68, 17, 146, 217, 35, 32, 46, 137, 180, 124, 184, 38, 119, 153, 227, 165,
103, 74, 237, 222, 197, 49, 254, 24, 13, 99, 140, 128, 192, 247, 112, 7
};
static const uint32_t Alogtable[256] =
{
1, 3, 5, 15, 17, 51, 85, 255, 26, 46, 114, 150, 161, 248, 19, 53,
95, 225, 56, 72, 216, 115, 149, 164, 247, 2, 6, 10, 30, 34, 102, 170,
229, 52, 92, 228, 55, 89, 235, 38, 106, 190, 217, 112, 144, 171, 230, 49,
83, 245, 4, 12, 20, 60, 68, 204, 79, 209, 104, 184, 211, 110, 178, 205,
76, 212, 103, 169, 224, 59, 77, 215, 98, 166, 241, 8, 24, 40, 120, 136,
131, 158, 185, 208, 107, 189, 220, 127, 129, 152, 179, 206, 73, 219, 118, 154,
181, 196, 87, 249, 16, 48, 80, 240, 11, 29, 39, 105, 187, 214, 97, 163,
254, 25, 43, 125, 135, 146, 173, 236, 47, 113, 147, 174, 233, 32, 96, 160,
251, 22, 58, 78, 210, 109, 183, 194, 93, 231, 50, 86, 250, 21, 63, 65,
195, 94, 226, 61, 71, 201, 64, 192, 91, 237, 44, 116, 156, 191, 218, 117,
159, 186, 213, 100, 172, 239, 42, 126, 130, 157, 188, 223, 122, 142, 137, 128,
155, 182, 193, 88, 232, 35, 101, 175, 234, 37, 111, 177, 200, 67, 197, 84,
252, 31, 33, 99, 165, 244, 7, 9, 27, 45, 119, 153, 176, 203, 70, 202,
69, 207, 74, 222, 121, 139, 134, 145, 168, 227, 62, 66, 198, 81, 243, 14,
18, 54, 90, 238, 41, 123, 141, 140, 143, 138, 133, 148, 167, 242, 13, 23,
57, 75, 221, 124, 132, 151, 162, 253, 28, 36, 108, 180, 199, 82, 246, 1
};
const uint32_t K_256[64] =
{
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
const uint32_t H0_256[8] =
{
0x6a09e667,
0xbb67ae85,
0x3c6ef372,
0xa54ff53a,
0x510e527f,
0x9b05688c,
0x1f83d9ab,
0x5be0cd19
};
/*
-------------------------------------------------------------------------------
***************************************************** F U N C T I O N S ***
-------------------------------------------------------------------------------
*/
/******************************************************************************/
static void loadBar(int i, int n, int r, int w)
{
// Only update r times.
if (n > r)
{
if (i % (n / r) != 0)
return;
}
// Calculuate the ratio of complete-to-incomplete.
float ratio = i / (float)n;
int c = (int)(ratio * w + 0.5);
// Show the percentage complete.
std::cout << std::setw(3) << (int)(ratio * 100) << "% [";
// Show the load bar.
int x;
for (x = 0; x<c; x++)
{
std::cout << "=";
}
for (x = c; x<w; x++)
{
std::cout << " ";
}
// Move to the first column
std::cout << "]\r";
if (i == n)
{
std::cout << "\n";
}
}
/******************************************************************************/
static uint32_t rotate_right(uint32_t x, uint32_t val)
{
return ((x >> val) | (x << (32 - val)));
}
/******************************************************************************/
static uint32_t shift_right(uint32_t x, uint32_t val)
{
return (x >> val);
}
/******************************************************************************/
static uint32_t Ch(uint32_t x, uint32_t y, uint32_t z)
{
return ((x & y) ^ ((~x) & z));
}
/******************************************************************************/
static uint32_t Maj(uint32_t x, uint32_t y, uint32_t z)
{
return ((x & y) ^ (x & z) ^ (y & z));
}
/******************************************************************************/
static uint32_t c_sigma_0(uint32_t x)
{
return (rotate_right(x, 2) ^ rotate_right(x, 13) ^ rotate_right(x, 22));
}
/******************************************************************************/
static uint32_t c_sigma_1(uint32_t x)
{
return (rotate_right(x, 6) ^ rotate_right(x, 11) ^ rotate_right(x, 25));
}
/******************************************************************************/
static uint32_t sigma_0(uint32_t x)
{
return (rotate_right(x, 7) ^ rotate_right(x, 18) ^ shift_right(x, 3));
}
/******************************************************************************/
static uint32_t sigma_1(uint32_t x)
{
return (rotate_right(x, 17) ^ rotate_right(x, 19) ^ shift_right(x, 10));
}
/******************************************************************************/
static void SubByte(uint8_t& value1, uint8_t& value2, uint8_t& value3, uint8_t& value4)
{
uint32_t row;
uint32_t col;
row = (value1 >> 4) & 0x0F;
col = value1 & 0x0F;
value1 = s_box[row][col];
row = (value2 >> 4) & 0x0F;
col = value2 & 0x0F;
value2 = s_box[row][col];
row = (value3 >> 4) & 0x0F;
col = value3 & 0x0F;
value3 = s_box[row][col];
row = (value4 >> 4) & 0x0F;
col = value4 & 0x0F;
value4 = s_box[row][col];
}
/******************************************************************************/
static uint8_t aes_mul(uint32_t a, uint32_t b)
{
if (a && b)
{
return (uint8_t)Alogtable[(Logtable[a] + Logtable[b]) % 255];
}
else
{
return 0;
}
}
/******************************************************************************/
void ZynqEncryptionContext::Process(BootImage& bi, PartitionHeader* partHdr)
{
Options& options = bi.options;
/* Setup the AES encryption context */
DataStreamEncryption aes_encrypt(WORDS_PER_AES_BLOCK, WORDS_PER_AES_KEY);
/* Data mover for handling endianness across architectures
7-series FPGA requires the data in Big Endian format
Zynq & ZynqMp requires the data in Little Endian format */
aes_encrypt.dataMover = new DataMoverLE();
aes_encrypt.maskEfuseFlag = false;
/* Get the key file or keys (Key0, StartCBC, HMAC) passed from command line */
std::string keyFilename = options.GetEncryptionKeyFile();
std::string key0 = options.GetKey0();
std::string startCbc = options.GetStartCbc();
std::string hmac = options.GetHmac();
/* If the key file is not given, generate a key file with the BIF file name */
if (aesFilename == "")
{
if (keyFilename == "")
{
aesFilename = StringUtils::ChangeExtension(options.GetBifFilename(), ".nky");
}
else
{
aesFilename = keyFilename;
}
}
bool exists;
std::ifstream keyFile(aesFilename.c_str());
exists = keyFile.good();
/* If the file already exists */
if (exists)
{
// Read the existing key file
aes_encrypt.ReadEncryptionKeyFile(aesFilename);
// Overwrite with the keys, if specified on the command line
if (key0 != "")
{
aes_encrypt.SetAesKeyString(key0);
}
if (startCbc != "")
{
aes_encrypt.setCbcString(startCbc);
}
if (hmac != "")
{
aes_encrypt.SetHmacKeyString(hmac);
}
}
/* If the key file is not specified - generate it */
else
{
aes_encrypt.GenerateEncryptionKeyFile(aesFilename, options);
}
/* Get the key source */
KeySource::Type keySource = options.GetEncryptedKeySource();
if (!Binary::CheckAddress(partHdr->partition->section->Length))
{
LOG_ERROR("Partition too large to encrypt");
}
bool isFPGA = partHdr->imageHeader->GetDomain() == Domain::PL;
/* Output buffer & output length */
uint8_t* encryptedDataBuffer;
uint32_t encryptedBufferByteLength;
/* Encrypt the stream */
aes_encrypt.AESDataStreamEncrypt(keySource, isFPGA, partHdr->partition->section->Data, (uint32_t)partHdr->partition->section->Length,
encryptedDataBuffer, encryptedBufferByteLength, partHdr->preservedBitstreamHdr.data, partHdr->preservedBitstreamHdr.size);
delete[] partHdr->partition->section->Data;
/* Populate the partition headers */
partHdr->partition->section->Data = encryptedDataBuffer;
partHdr->partition->section->Length = encryptedBufferByteLength;
partHdr->imageHeader->SetTotalFsblFwSizeIh(encryptedBufferByteLength);
}
/******************************************************************************/
ZynqEncryptionContext::ZynqEncryptionContext()
{
wordsPerAesKey = WORDS_PER_AES_KEY;
wordsPerAesBlock = WORDS_PER_AES_BLOCK;
keySchedule = NULL;
aesKey = NULL;
hmacKey = NULL;
first_AES_block = false;
d_NumRounds = 0;
working_AES_block = NULL;
dataMover = NULL;
maskEfuseFlag = false;
}
/******************************************************************************/
ZynqEncryptionContext::ZynqEncryptionContext(const EncryptionContext * other)
: wordsPerAesKey(WORDS_PER_AES_KEY)
, wordsPerAesBlock(WORDS_PER_AES_BLOCK)
, working_AES_block(NULL)
, keySchedule(NULL)
, aesKey(NULL)
, hmacKey(NULL)
, first_AES_block(false)
, dataMover(NULL)
, maskEfuseFlag(false)
, d_NumRounds(0)
{
aesFilename = other->aesFilename;
}
/******************************************************************************/
ZynqEncryptionContext::ZynqEncryptionContext(uint32_t words_per_AES_block0, uint32_t words_per_AES_key0)
: wordsPerAesKey(words_per_AES_key0)
, wordsPerAesBlock(words_per_AES_block0)
, keySchedule(NULL)
, aesKey(NULL)
, hmacKey(NULL)
, first_AES_block(false)
, dataMover(NULL)
, maskEfuseFlag(false)
{
memset(ivCbc, 0, 16);
if ((wordsPerAesBlock == 8) || (wordsPerAesKey == 8))
{
d_NumRounds = 14;
}
else
{
if ((wordsPerAesBlock == 6) || (wordsPerAesKey == 6))
{
d_NumRounds = 12;
}
else
d_NumRounds = 10;
}
working_AES_block = new uint32_t[wordsPerAesBlock];
}
/******************************************************************************/
ZynqEncryptionContext::~ZynqEncryptionContext(void)
{
if (aesKey != NULL)
delete[] aesKey;
if (keySchedule != NULL)
delete[] keySchedule;
if (hmacKey != NULL)
delete[] hmacKey;
if (working_AES_block != NULL)
delete[] working_AES_block;
}
/******************************************************************************/
uint32_t ZynqEncryptionContext::CvtChars2Int(uint8_t value1, uint8_t value2, uint8_t value3, uint8_t value4)
{
return (value1 << 24) | (value2 << 16) | (value3 << 8) | value4;
}
/******************************************************************************/
void ZynqEncryptionContext::ClearKeySchedule(void)
{
// Allocate a key schedule if we don't already have one.
if (keySchedule == NULL)
keySchedule = new uint32_t[sizeof(uint32_t) * (d_NumRounds + 1)];
for (uint32_t index = 0; index < sizeof(uint32_t) * (d_NumRounds + 1); index++)
{
keySchedule[index] = 0;
}
}
/******************************************************************************/
void ZynqEncryptionContext::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 ZynqEncryptionContext::GenerateAesKey(void)
{
uint32_t keysize = WORDS_PER_AES_KEY * sizeof(uint32_t);
uint8_t newKeyData[BYTES_PER_AES_KEY];
uint8_t newKey[BYTES_PER_AES_KEY];
// Get temp data to encrypt as the newKey.
SetRandomSeed();
GetRandomData(newKeyData, keysize);
memcpy(newKey, newKeyData, keysize);
// Encrypt the newKeyData with the temp key and temp CBC into newKey as the generated new key.
EncryptKeys(newKeyData, keysize, newKey);
SetAesKey(newKey);
LOG_INFO("AES Key generated successfully");
}
/******************************************************************************/
void ZynqEncryptionContext::EncryptKeys(const uint8_t* newKeyData, uint32_t keysize, uint8_t* newKey)
{
// Use a local encrypt object so that we don't disturb any of the caller's keys.
ZynqEncryptionContext temp_encrypt(wordsPerAesBlock, wordsPerAesKey);
temp_encrypt.dataMover = new DataMoverLE();
temp_encrypt.GenerateTempKeys();
temp_encrypt.InitKeySchedule();
temp_encrypt.AES_Encrypt(newKeyData, keysize, newKey);
}
/******************************************************************************/
const uint8_t* ZynqEncryptionContext::GetAesKey(void)
{
return (uint8_t *)this->aesKey;
}
/******************************************************************************/
void ZynqEncryptionContext::SetCbc(const uint8_t* initialVector)
{
memcpy(ivCbc, initialVector, WORDS_PER_AES_BLOCK * sizeof(uint32_t));
}
/******************************************************************************/
void ZynqEncryptionContext::setCbcString(const std::string& initialVector)
{
uint8_t hexData[256];
if (initialVector.size() != (BYTES_PER_CBC_KEY * 2))
{
LOG_DEBUG(DEBUG_STAMP, "CBC key size - %d", initialVector.size());
LOG_ERROR("An CBC key must be 128 bits long - %s", initialVector.c_str());
}
PackHex(initialVector, hexData);
SetCbc(hexData);
}
/******************************************************************************/
void ZynqEncryptionContext::GenerateCbc(void)
{
uint8_t newCBC[BYTES_PER_CBC_KEY];
uint8_t newCBCData[BYTES_PER_CBC_KEY];
// Setup a new encrypt object so that we don't disturb any of the caller's keys.
ZynqEncryptionContext temp_encrypt(WORDS_PER_AES_BLOCK, WORDS_PER_AES_KEY);
temp_encrypt.dataMover = new DataMoverLE();
// Get temp data to encrypt as the newCBC.
SetRandomSeed();
GetRandomData(newCBCData, BYTES_PER_CBC_KEY);
/* Encrypt the newKeyData with the temp key and temp CBC into newCBC as the generated
new CBC. */
temp_encrypt.GenerateTempKeys();
temp_encrypt.InitKeySchedule();
temp_encrypt.AES_Encrypt(newCBCData, BYTES_PER_CBC_KEY, newCBC);
SetCbc(newCBC);
LOG_INFO("CBC generated successfully");
}
/******************************************************************************/
const uint8_t * ZynqEncryptionContext::GetCbc(void)
{
#if 1
static uint8_t be[16];
((uint32_t*)be)[0] = ReadBigEndian32(ivCbc);
((uint32_t*)be)[1] = ReadBigEndian32(ivCbc + 4);
((uint32_t*)be)[2] = ReadBigEndian32(ivCbc + 8);
((uint32_t*)be)[3] = ReadBigEndian32(ivCbc + 12);
return be;
#else
return (uint8_t *)this->d_InitialVector;
#endif
}
/******************************************************************************/
void ZynqEncryptionContext::SetHmacKey(const uint8_t * HMACKey)
{
hmacKey = new uint32_t[WORDS_PER_HMAC_KEY];
for (uint32_t index = 0; index < WORDS_PER_HMAC_KEY; index++)
{
hmacKey[index] = ReadBigEndian32(HMACKey);
HMACKey += sizeof(uint32_t);
}
}
/******************************************************************************/
void ZynqEncryptionContext::SetHmacKeyString(const std::string& HMACKey)
{
uint8_t hexData[256];
if (HMACKey.size() != (BYTES_PER_HMAC_KEY * 2))
{
LOG_DEBUG(DEBUG_STAMP, "HMAC key size - %d", HMACKey.size());
LOG_ERROR("An HMAC key must be 128 bits long - %s", HMACKey.c_str());
}
PackHex(HMACKey, hexData);
SetHmacKey(hexData);
}
/******************************************************************************/
void ZynqEncryptionContext::GenerateHmacKey(void)
{
uint8_t newHMAC[BYTES_PER_HMAC_KEY];
uint8_t newHMACData[BYTES_PER_HMAC_KEY];
// Setup a new encrypt object so that we don't disturb any of the caller's keys.
ZynqEncryptionContext temp_encrypt(WORDS_PER_AES_BLOCK, WORDS_PER_AES_KEY);
temp_encrypt.dataMover = new DataMoverLE();
// Get temp data to encrypt as the newHMAC.
SetRandomSeed();
GetRandomData(newHMACData, BYTES_PER_HMAC_KEY);
/* Encrypt the newHMACData with the temp key and temp CBC into newKey as the generated
new HMAC */
temp_encrypt.GenerateTempKeys();
temp_encrypt.InitKeySchedule();
temp_encrypt.AES_Encrypt(newHMACData, BYTES_PER_HMAC_KEY, newHMAC);
SetHmacKey(newHMAC);
LOG_INFO("HMAC generated successfully");
}
/******************************************************************************/
const uint8_t * ZynqEncryptionContext::GetHmacKey(void)
{
return (uint8_t *)this->hmacKey;
}
/******************************************************************************/
uint32_t ZynqEncryptionContext::Transform(uint32_t orig_col, uint32_t col_num, bool rotate_rcon)
{
uint8_t element1;
uint8_t element2;
uint8_t element3;
uint8_t element4;
if (rotate_rcon != 0)
{
element1 = (orig_col >> 16) & 0xff;
element2 = (orig_col >> 8) & 0xff;
element3 = orig_col & 0xff;
element4 = orig_col >> 24;
}
else
{
element1 = orig_col >> 24;
element2 = (orig_col >> 16) & 0xff;
element3 = (orig_col >> 8) & 0xff;
element4 = orig_col & 0xff;
}
SubByte(element1, element2, element3, element4);
if (rotate_rcon != 0)
{
element1 ^= round_constant[(col_num / wordsPerAesKey) - 1];
}
return CvtChars2Int(element1, element2, element3, element4);
}
/******************************************************************************/
void ZynqEncryptionContext::InitKeySchedule(void)
{
uint32_t col;
// Clear any key schedule, and make sure we
// start CBC chaining from the beginning.
ClearKeySchedule();
first_AES_block = true;
// copy original key into columns 1 - d_NumKey of key schedule
for (col = 0; col < wordsPerAesKey; col++)
{
keySchedule[col] = aesKey[col];
}
// Set the remaining columns of the schedule
for (col = wordsPerAesKey; col < sizeof(uint32_t) * (d_NumRounds + 1); col++)
{
uint32_t T_prev_col;
// If col is a multiple of wordsPerAesKey, transform
if ((col % wordsPerAesKey) == 0)
{
T_prev_col = Transform(keySchedule[col - 1], col, true);
}
else
{
if ((wordsPerAesKey == 8) && ((col % 4) == 0))
{
// For keysize 256, sub bytes for col multiple of 4
T_prev_col = Transform(keySchedule[col - 1], col, false);
}
else
{
T_prev_col = keySchedule[col - 1];
}
}
keySchedule[col] = keySchedule[col - wordsPerAesKey] ^ T_prev_col;
}
}
/******************************************************************************/
void ZynqEncryptionContext::AddRoundKey(uint32_t * int_array, uint32_t num_round)
{
for (uint32_t index = 0; index < wordsPerAesBlock; index++)
{
int_array[index] ^= keySchedule[(sizeof(uint32_t) * num_round) + index];
}
}
/******************************************************************************/
void ZynqEncryptionContext::ByteSubTransformation(uint32_t * int_array)
{
uint8_t element1;
uint8_t element2;
uint8_t element3;
uint8_t element4;
for (uint32_t index = 0; index < wordsPerAesBlock; index++)
{
element1 = int_array[index] >> 24;
element2 = (int_array[index] >> 16) & 0xff;
element3 = (int_array[index] >> 8) & 0xff;
element4 = int_array[index] & 0xff;
SubByte(element1, element2, element3, element4);
int_array[index] = CvtChars2Int(element1, element2, element3, element4);
}
}
/******************************************************************************/
void ZynqEncryptionContext::ShiftRowTransformation(uint32_t * int_array)
{
uint32_t num_cols = wordsPerAesBlock;
uint32_t temp_col0 = int_array[0];
uint32_t temp_col1 = int_array[1];
uint32_t temp_col2 = int_array[2];
for (uint32_t index = 0; index < num_cols - 3; index++)
{
int_array[index] = (int_array[index + 0] & 0xff000000) |
(int_array[index + 1] & 0x00ff0000) |
(int_array[index + 2] & 0x0000ff00) |
(int_array[index + 3] & 0x000000ff);
}
int_array[num_cols - 3] = (int_array[num_cols - 3] & 0xff000000) |
(int_array[num_cols - 2] & 0x00ff0000) |
(int_array[num_cols - 1] & 0x0000ff00) |
(temp_col0 & 0x000000ff);
int_array[num_cols - 2] = (int_array[num_cols - 2] & 0xff000000) |
(int_array[num_cols - 1] & 0x00ff0000) |
(temp_col0 & 0x0000ff00) |
(temp_col1 & 0x000000ff);
int_array[num_cols - 1] = (int_array[num_cols - 1] & 0xff000000) |
(temp_col0 & 0x00ff0000) |
(temp_col1 & 0x0000ff00) |
(temp_col2 & 0x000000ff);
}
/******************************************************************************/
void ZynqEncryptionContext::MixColumnTransformation(uint32_t* int_array)
{
uint8_t in_byte0;
uint8_t in_byte1;
uint8_t in_byte2;
uint8_t in_byte3;
uint8_t temp_byte0;
uint8_t temp_byte1;
uint8_t temp_byte2;
uint8_t temp_byte3;
for (uint32_t index = 0; index < wordsPerAesBlock; index++)
{
in_byte0 = int_array[index] >> 24;
in_byte1 = (int_array[index] >> 16) & 0xff;
in_byte2 = (int_array[index] >> 8) & 0xff;
in_byte3 = int_array[index] & 0xff;
temp_byte0 = aes_mul(2, (uint32_t)in_byte0) ^
aes_mul(3, (uint32_t)in_byte1) ^
in_byte2 ^ in_byte3;
temp_byte1 = in_byte0 ^
aes_mul(2, (uint32_t)in_byte1) ^
aes_mul(3, (uint32_t)in_byte2) ^
in_byte3;
temp_byte2 = in_byte0 ^
in_byte1 ^
aes_mul(2, (uint32_t)in_byte2) ^
aes_mul(3, (uint32_t)in_byte3);
temp_byte3 = aes_mul(3, (uint32_t)in_byte0) ^
in_byte1 ^
in_byte2 ^
aes_mul(2, (uint32_t)in_byte3);
int_array[index] = CvtChars2Int(temp_byte0, temp_byte1,
temp_byte2, temp_byte3);
}
}
/******************************************************************************/
void ZynqEncryptionContext::GenerateTempKeys(void)
{
uint8_t tempKey[BYTES_PER_AES_KEY];
SetRandomSeed();
GetRandomData(tempKey, BYTES_PER_AES_KEY);
SetAesKey(tempKey);
uint8_t tempCBC[BYTES_PER_CBC_KEY];
SetRandomSeed();
GetRandomData(tempCBC, BYTES_PER_CBC_KEY);
SetCbc(tempCBC);
}
/******************************************************************************/
void ZynqEncryptionContext::WriteEncryptionKeyFile(const std::string& baseFileName, bool useOptionalKey, uint32_t blocks)
{
uint32_t 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";
}
/* Write AES key */
keyFile << "Key 0 ";
for (index = 0; index < wordsPerAesKey; ++index)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << aesKey[index];
}
keyFile << ";\n";
/* Write CBC Initial Vector */
keyFile << "Key StartCBC ";
for (index = 0; index < WORDS_PER_CBC_KEY * 4; ++index)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(2) << (int)ivCbc[index];
}
keyFile << ";\n";
/* Write HMAC key */
keyFile << "Key HMAC ";
for (index = 0; index < WORDS_PER_HMAC_KEY; ++index)
{
keyFile << std::uppercase << std::hex << std::setfill('0') << std::setw(8) << hmacKey[index];
}
keyFile << ";\n";
}
/******************************************************************************/
void ZynqEncryptionContext::ReadEncryptionKeyFile(const std::string& inputFileName)
{
std::ifstream keyFile(inputFileName.c_str());
if (!keyFile)
{
LOG_ERROR("Failure reading AES key file - %s", inputFileName.c_str());
}
uint8_t noOfSemiColons = 0;
while (keyFile)
{
std::string word;
keyFile >> word;
if (word == "")
{
break;
}
char c = ' ';
if (word == "Key")
{
// First Word is "Key"
keyFile >> word;
if (word == "0")
{
// Second Word is "0"
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
if (word == "pick")
{
// Third Word is "pick" - then generate AES key, otherwise set the key specified
GenerateAesKey();
}
else
{
SetAesKeyString(word);
}
}
else if (word == "StartCBC")
{
// Second Word is "StartCBC"
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
if (word == "pick")
{
// Third Word is "pick" - then generate CBC key, otherwise set the key specified
GenerateCbc();
}
else
{
setCbcString(word);
}
}
else if (word == "HMAC")
{
// Second Word is "HMAC"
word = "";
while ((keyFile >> c) && isalnum(c))
{
word.push_back(c);
}
if (word == "pick")
{
// Third Word is "pick" - then generate HMAC key, otherwise set the key specified
GenerateHmacKey();
}
else
{
SetHmacKeyString(word);
}
}
else
{
// Second Word other than "0", "StartCBC" or "HMAC" - throw error
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());
}
}
else if (word == "Device")
{
// If first word is not "Key" but "Device"
word = "";
while ((keyFile >> c) && (isalnum(c) || c == '-' || c == '_'))
{
word.push_back(c);
}
deviceName = word;
}
else
{
// If first word is neither "Key" nor "Device"
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());
}
if (c == ';')
{
// Semicolons expected at end of every line
noOfSemiColons++;
}
}
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. \n Partname 'Device' missing in the key file", inputFileName.c_str());
}
if (noOfSemiColons != 4)
{
LOG_DEBUG(DEBUG_STAMP, "Terminating ';' expected at end of each line");
LOG_ERROR("Error parsing AES key file - %s. \n Terminating ';' expected at end of each line", inputFileName.c_str());