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/*++
Copyright (c) 2010 WonderMedia Technologies, Inc.
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, either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details. You
should have received a copy of the GNU General Public License along with this
program. If not, see http://www.gnu.org/licenses/>.
WonderMedia Technologies, Inc.
10F, 529, Chung-Cheng Road, Hsin-Tien, Taipei 231, R.O.C.
--*/
/*
* RSA encode/decode Utilities
*/
#include <common.h>
#include <command.h>
#if 1/*(CONFIG_COMMANDS & CFG_CMD_RSA)*/
extern int rsa_check(unsigned int pub_key_addr, unsigned int pub_key_size, unsigned int sig_addr, unsigned int sig_size, u8 *out_buf);
extern void cypher_initialization(void);
extern int cypher_encode(unsigned int buf_in, unsigned int in_len, unsigned int buf_out);
extern void cipher_release(void);
/*-----------------------------------------------------------------------
* Definitions
*/
/*
* image_mem_addr : boot.img memory address.
* image _size : boot.img size
* sig_addr : signature memory address.
* sig_size : signature size
* return : 0 : rsa decode and compare pass, otherwise return nonzero.
*/
int image_rsa_check(
unsigned int image_mem_addr,
unsigned int image_size,
unsigned int sig_addr,
unsigned int sig_size)
{
int ret = 0, i, j, k;
char *key = NULL;
unsigned int pub_key_addr, pub_key_size;
unsigned char out_buf[128], hash_kernel[32], hash_signature[64], tmp;
key = getenv("wmt.rsa.pem");
if (!key) {
printf("get public key fail\n");
return 1;
}
pub_key_size = strlen(key);
#ifdef DEBUG_RSA_CMD
printf("pub_key_size=0x%x, key=%s\n", pub_key_size, key);
#endif
cypher_initialization();
ret = cypher_encode(image_mem_addr, image_size, (unsigned int)hash_kernel);
cipher_release();
if (ret) {
printf("cypher decode fail\n");
return 1;
}
pub_key_addr = (u32) key;
ret = rsa_check(pub_key_addr, pub_key_size, sig_addr, sig_size, out_buf);
if (ret) {
printf("decode signature fail\n");
return 2;
}
for (i = 0, j = 0; i < 64; i=i+2,j++) {
tmp = 0;
for (k = 0; k < 2; k++) {
if (out_buf[i+k] == '0')
tmp += ((k == 0) ?(0<<4):0);
else if (out_buf[i+k] == '1')
tmp += ((k == 0) ?(1<<4):1);
else if (out_buf[i+k] == '2')
tmp += ((k == 0) ?(2<<4):2);
else if (out_buf[i+k] == '3')
tmp += ((k == 0) ?(3<<4):3);
else if (out_buf[i+k] == '4')
tmp += ((k == 0) ?(4<<4):4);
else if (out_buf[i+k] == '5')
tmp += ((k == 0) ?(5<<4):5);
else if (out_buf[i+k] == '6')
tmp += ((k == 0) ?(6<<4):6);
else if (out_buf[i+k] == '7')
tmp += ((k == 0) ?(7<<4):7);
else if (out_buf[i+k] == '8')
tmp += ((k == 0) ?(8<<4):8);
else if (out_buf[i+k] == '9')
tmp += ((k == 0) ?(9<<4):9);
else if (out_buf[i+k] == 'a')
tmp += ((k == 0) ?(0xa<<4):0xa);
else if (out_buf[i+k] == 'b')
tmp += ((k == 0) ?(0xb<<4):0xb);
else if (out_buf[i+k] == 'c')
tmp += ((k == 0) ?(0xc<<4):0xc);
else if (out_buf[i+k] == 'd')
tmp += ((k == 0) ?(0xd<<4):0xd);
else if (out_buf[i+k] == 'e')
tmp += ((k == 0) ?(0xe<<4):0xe);
else if (out_buf[i+k] == 'f')
tmp += ((k == 0) ?(0xf<<4):0xf);
else {
printf("change from character to digit fail out_buf[%d]=%c\n", i, out_buf[i]);
ret = 3;
break;
}
}
//printf("i=%d ,j=%d tmp=%x out_buf=%d%c\n", i , j, tmp, out_buf[i+1], out_buf[i]);
if (ret == 3)
break;
hash_signature[j] = tmp;
}
if (strncmp((char *)hash_signature, (char *)hash_kernel, 32) != 0) {
printf("signature decode =");
for (i = 0; i < 32; i++)
printf("%2.2x", hash_signature[i]);
printf("\nbootImage decode =");
for (i = 0; i < 32; i++)
printf("%x", hash_kernel[i]);
printf("\n sha256 cmp fail\n");
return 3;
}
return ret;
}
/*
* image RSA verify
* rsa verify <image_mem_addr> <image_size> <signature_mem_addr> <signature_size>
* This command is used to verify the image signature by rsa/sha256.
* The rsa public key will be get from env variable <wmt.rsa.pem>
*/
int do_rsa (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
int rcode = 0;
if (strncmp(argv[1], "verify", 6) == 0 && argc == 6) {
ulong image_mem_addr = simple_strtoul(argv[2], NULL, 16);
ulong image_size = simple_strtoul(argv[3], NULL, 16);
ulong sig_addr = simple_strtoul(argv[4], NULL, 16);
ulong sig_size = simple_strtoul(argv[5], NULL, 16);
#ifdef DEBUG_RSA_CMD
printf("image_mem_addr=0x%x\r\n", image_mem_addr);
printf("image_size=0x%x\r\n", image_size);
printf("sig_addr=0x%x\r\n", sig_addr);
printf("sig_size=0x%x\r\n", sig_size);
#endif
rcode = image_rsa_check(image_mem_addr, image_size, sig_addr, sig_size);
} else {
rcode = 1;
printf("please type \"rsa verify\" with parameter \n");
}
return rcode;
}
/***************************************************/
U_BOOT_CMD(
rsa, 6, 1, do_rsa,
"rsa - RSA utility commands\n",
"- This command is used to verify the image signature by rsa/sha256.\n"
"<image_mem_addr> - boot.img address in memory "
"<image_size> - boot.img address in memory\n"
"<signature_mem_addr> - hashed rsa signature of address in memory\n"
"<signature_size> - signature size\n"
);
#endif /* CFG_CMD_?? */
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