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bl3sig.c
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bl3sig.c
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// aml_encrypt_g12b --bl3sig
//
// This is supposed to replicate this
// ./aml_encrypt_g12b --bl3sig --input bl30_new.bin.g12a.enc --output bl30_new.bin.enc --level v3 --type bl30
// ./aml_encrypt_g12b --bl3sig --input bl31.img --output bl31.img.enc --level v3 --type bl31
// ./aml_encrypt_g12b --bl3sig --input bl33.bin --output bl33.bin.enc --level v3 --type bl33 --compress lz4
#include <string.h>
#include "types.h"
#include "lib.h"
#include "lz4hc.h"
int main(int argc, char ** argv) {
opt_values_bl3sig_t opt_values;
char **opt_array_view = (char**)&opt_values;
option_t opts[21] = {
{ "input", 1, 0, 0x30 }, // 0x00
{ "amluserkey", 1, 0, 0x31 }, // 0x01
{ "userkey", 1, 0, 0x32 }, // 0x02
{ "output", 1, 0, 0x33 }, // 0x03
{ "skipsector", 1, 0, 0x34 }, // 0x04
{ "level", 1, 0, 0x35 }, // 0x05
{ "type", 1, 0, 0x36 }, // 0x06
{ "compress", 1, 0, 0x37 } // 0x07
};
bzero(&opt_values, sizeof opt_values);
int getopt_result = 0;
while(getopt_long(argc, argv, "", opts, &getopt_result) != -1)
opt_array_view[getopt_result] = optarg;
struct stat stat_info;
if(opt_values.input == NULL || stat(opt_values.input, &stat_info) != 0)
exit(1);
char trusted_payload_fname[0x100];
char output_file_name[0x100];
bzero(output_file_name, 0x100);
/* try to fixup the output filename if it's not provied */
if(opt_values.output == NULL) {
if(0 == stat(opt_values.amluserkey, &stat_info) ||
0 == stat(opt_values.userkey, &stat_info)) {
sprintf(output_file_name, "%s%s", opt_values.input, ".sig");
} else {
sprintf(output_file_name, "%s%s", opt_values.input, ".pkg");
}
opt_values.output = output_file_name;
}
/* onto the signing */
char *key_file = opt_values.userkey != NULL
? opt_values.userkey
: opt_values.amluserkey;
bool_t withUserKey = 0 == stat(key_file, &stat_info);
bool_t rsa_key = false;
// rsa_init(&rsa_ctx, 0, 0);
if(withUserKey) {
// rsa_key = load_rsa_key_file(rsa_ctx, keyfile);
}
if(!rsa_key) {
bzero(trusted_payload_fname, 0x100);
sprintf(trusted_payload_fname, "%s.%09d.tp", opt_values.output, rand());
off_t header_offset = 0;
off_t payload_offset = 0x490;
uint8_t in_header[0x50];
uint8_t out_header[0x100];
bzero(out_header, 0x100);
*(uint64_t*)out_header = 0x5244482d58334c42; // "BL3X-HDR"
*(uint32_t*)&out_header[0x0c] = 0x100;
if(0 == stat(opt_values.input, &stat_info)) {
FILE *fin = fopen(opt_values.input, "rb");
// trusted_payload_fname = $output.$rnd.tp
FILE *fout = fopen(trusted_payload_fname, "wb");
if(NULL != fin && NULL != fout) {
fread(in_header, 1, 0x50, fin);
if(*(uint32_t*)in_header == 0x12348765) {
header_offset = 0x200;
payload_offset = 0x590;
memcpy(&out_header[0x10], &in_header[0x08], 0x10);
*(uint32_t*)&out_header[0x20] = *(uint32_t*)&in_header[0x20];
*(uint32_t*)&out_header[0x28] = *(uint32_t*)&in_header[0x18];
*(uint32_t*)&out_header[0x2c] = *(uint32_t*)&in_header[0x28];
memcpy(&out_header[0x30], &in_header[0x00], 0x50);
}
// copy header from input to tp file.
fseek(fin, header_offset, SEEK_SET);
file_copy(fin, fout, stat_info.st_size - header_offset);
}
if(NULL != fin) fclose(fin);
if(NULL != fout) fclose(fout);
if(NULL != opt_values.compress &&
0 == strncmp(opt_values.compress, "lz4",3)) {
char lz4_fname[0x100];
bzero(lz4_fname,0x100);
sprintf(lz4_fname,"%s.lz4",trusted_payload_fname);
lz4_header_t lz4_header;
bzero(&lz4_header, 0x80);
lz4_header.magic = 0x43345a4c; /* "C4LZ" */
lz4_header.magic_2 = 0x43345a4c;
lz4_header.header_size = 0x80;
// can we live with a zero nonce?
lz4_header.random_nonce[0] = 0x0;
time_t timep;
time(&timep);
struct tm *local_time = localtime(&timep);
sprintf(lz4_header.timestamp, "%04d%02d%02d%02d:%02d:%02d",
local_time->tm_year + 1900,
local_time->tm_mon + 1,
local_time->tm_mday,
local_time->tm_hour,
local_time->tm_min,
local_time->tm_sec);
if(0 == stat(trusted_payload_fname, &stat_info)) {
file_sha256(trusted_payload_fname, lz4_header.file_sha256);
void *payload = malloc(stat_info.st_size);
if(NULL != payload) {
FILE *fin = fopen(trusted_payload_fname, "rb");
if (NULL == fin) exit(1);
fread(payload, 1, stat_info.st_size, fin);
fout = fopen(lz4_fname, "wb");
if (NULL != fout) {
void *dst = malloc(stat_info.st_size+0x400);
if(NULL != dst) {
lz4_header.original_size = stat_info.st_size;
lz4_header.compressed_size
= LZ4_compress_HC(payload, dst,
lz4_header.original_size,
stat_info.st_size + 0x400,
0xc);
sha256((uchar_t *)&lz4_header, 0x60, lz4_header.header_sha256);
fwrite((uchar_t *)&lz4_header, 1, 0x80, fout);
fwrite(dst, 1, lz4_header.compressed_size, fout);
free(dst);
}
fclose(fout);
}
fclose(fin);
free(payload);
// copy file from the lz4 ext to the original .tp file.
// and unlink the lz4 one.
// for now we'll just call the tp file the lz4 file.
memcpy(trusted_payload_fname, lz4_fname, 0x100);
}
}
}
/* ok so we did the optional lz4 compression */
if(0 == stat(trusted_payload_fname, &stat_info)) {
size_t size16k = (stat_info.st_size + 0x48f & 0xfffffe00) - 0x290;
file_extend(trusted_payload_fname, size16k, 0);
// The asumption here is that we successfully copied trusted_payload_fname.
bl3_sig_header_t sig_header;
bzero(&sig_header, 0x290);
sig_header.magic = 0x4c4d4140; // @AML
sig_header.unk1 = 0x1;
sig_header.size16k = size16k;
sig_header.size = 0x290;
// if (withUserKey) {
// // open keyfile
// // read the last 32byte from the key file
// // into a 0x30 zeroed buffer.
// // write them into sig_header.key
// // if --type is NULL, abort.
// // some logic depending on the --type name
// }
file_sha256(trusted_payload_fname, sig_header.file_sha256);
size_t header_length = 0x260; // this is 0x280 - size of rsa key or something if withUserKey
sha256((uchar_t*)&sig_header.magic, header_length, sig_header.sha256);
// do some rsa_pkcs1 signing if withUserKey
uint8_t header_buf[0x2000];
bzero(&header_buf, 0x2000);
*(uint32_t*)&header_buf[0x0] = 0x59454b40; // @KEY
*(uint32_t*)&header_buf[0x4] = 0x30;
*(uint16_t*)&header_buf[0x8] = 0x1;
*(uint32_t*)&header_buf[0xa] = 0x30;
size_t header_buf_size = 0x490;
// if (withUserKey) ...
FILE *fout = fopen(opt_values.output, "wb");
if(fout != NULL) {
/* header_offset == 0, unless --input starts with 0x12348765 */
if(header_offset > 0)
fwrite(&out_header, 1, 0x100, fout);
/* header_buf_size is 0x490 */
fwrite(&header_buf, 1, header_buf_size, fout);
/* sig_header will be written 0x290 -- 0x720 */
fwrite(&sig_header, 1, 0x290, fout);
fclose(fout);
}
/* output_file_name = output_file_name + trusted_payload_fname */
file_append(trusted_payload_fname, opt_values.output);
// if(withUserKey) ...
}
}
// drop the fp_fname
unlink(trusted_payload_fname);
} else {
/* rsa_key is true */
}
}