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/*
* Copyright (C) 2015 Broadcom Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <zlib.h>
#include "secimage.h"
#define MIN_SIZE (1024*120)
/*----------------------------------------------------------------------
* Name : SBIUsage
* Purpose :
* Input : none
* Output : none
*---------------------------------------------------------------------*/
int SBIUsage(void)
{
printf("\nTo create a Secure Boot Image:\n");
printf("secimage: -out <output binary> [-hmac hmac_binary_key] <-config configfile>");
printf("\n\t\t[-bl input binary]\n");
return 0;
}
/*----------------------------------------------------------------------
* Name : AddImagePayload
* Purpose :
* Input : none
* Output : none
*---------------------------------------------------------------------*/
int AddImagePayload(char *h, char *filename, unsigned int filesize)
{
uint32_t totalLen;
int length = filesize;
int padlen = 0;
int status = 0;
totalLen = 0x40;
status = DataRead(filename, (uint8_t *)h + totalLen, &length);
printf("\r\n Adding file %s ... \r\n", filename);
if (!status) {
if (length & 15) {
padlen = 16 - (length & 15);
memset((uint8_t *)h + totalLen + length, 0, padlen);
length += padlen;
}
*(uint32_t *)&h[FIELD5_OFFSET] = length;
*(uint32_t *)&h[FIELD6_OFFSET] += length;
} else
printf("Error reading image Payload from %s\n", filename);
return status;
}
/*----------------------------------------------------------------------
* Name : CreateSecureBootImage
* Purpose :
* Input : none
* Output : none
*---------------------------------------------------------------------*/
int CreateSecureBootImage(int ac, char **av)
{
char *configfile = NULL, *arg, *privkey = NULL, *bl = NULL;
int status = 0;
uint32_t sbiLen;
struct stat file_stat;
uint32_t add_header = 1;
char *outfile = *av;
unsigned int filesize;
char *buf;
--ac; ++av;
if (ac <= 0)
return SBIUsage();
while (ac) {
arg = *av;
if (!strcmp(arg, "-bl")) {
--ac, ++av;
bl = *av;
} else if (!strcmp(arg, "-hmac")) {
--ac, ++av;
privkey = *av;
} else if (!strcmp(arg, "-config")) {
--ac, ++av;
configfile = *av;
} else if (!strcmp(arg, "-noheader")) {
add_header = 0;
} else {
return SBIUsage();
}
--ac, ++av;
}
if (stat(bl, &file_stat) == -1) {
puts("Can't stat bl");
return -1;
}
filesize = file_stat.st_size + MIN_SIZE;
buf = calloc(sizeof(uint8_t), filesize);
if (buf == NULL) {
puts("Memory allocation error");
status = -1;
goto done;
}
*(uint32_t *)&buf[FIELD6_OFFSET] = 0x40;
*(uint32_t *)&buf[FIELD9_OFFSET] = 0x45F2D99A;
*(uint32_t *)&buf[FIELD3_OFFSET] = 0x900FFFFF;
*(uint16_t *)&buf[FIELD1_OFFSET] = 0x40;
*(uint32_t *)&buf[FIELD4_OFFSET] = 0x40;
*(uint16_t *)&buf[FIELD2_OFFSET] = 0x10;
*(uint16_t *)&buf[FIELD8_OFFSET] = 0x20;
*(uint16_t *)&buf[FIELD7_OFFSET] = 0x10;
if (status == 0) {
if (configfile)
FillHeaderFromConfigFile(buf, configfile);
status = AddImagePayload(buf, bl, filesize);
if (status) {
status = -1;
goto done;
}
sbiLen = *(uint32_t *)&buf[FIELD6_OFFSET];
printf("HMAC signing %d bytes\n", sbiLen);
status = AppendHMACSignature((uint8_t *)buf, sbiLen, privkey,
add_header ? 0x10 : 0x40);
if (status > 0) {
sbiLen += status;
status = 0;
}
if (!status) {
((HEADER *)buf)->Length = sbiLen;
((HEADER *)buf)->crc = crc32(0xFFFFFFFF,
(uint8_t *)buf, 12);
printf("Generating Image file %s: %d bytes\n",
outfile, sbiLen);
if (!add_header)
status = DataWrite(outfile, &buf[0x40],
sbiLen - 0x40);
else
status = DataWrite(outfile, buf, sbiLen);
}
}
if (status < 0)
printf("Generation error %d\n", status);
done:
free(buf);
return status;
}
int main(int argc, char **argv)
{
argc--;
argv++;
if (argc > 0) {
if (!strcmp(*argv, "-out"))
return CreateSecureBootImage(--argc, ++argv);
}
SBIUsage();
return 0;
}
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