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lib: rsa-sign: support calculate deferent size of rsa's key 

Signed-off-by: Jason Zhu <jason.zhu@rock-chips.com>
Change-Id: Ia473b5123c11ed57d1eed560964b6a7dc482b7df
This commit is contained in:
Jason Zhu 2020-12-23 22:14:01 +08:00
parent aa00306883
commit 781ee9b393
2 changed files with 33 additions and 15 deletions
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12
lib/rsa/Kconfig
View File

@ -34,4 +34,16 @@ config RSA_FREESCALE_EXP
Enables driver for RSA modular exponentiation using Freescale cryptographic
accelerator - CAAM.
config RSA_N_SIZE
hex "Define the RSA N size"
default 0x100
config RSA_E_SIZE
hex "Define the RSA E size"
default 0x100
config RSA_C_SIZE
hex "Define the RSA C size"
default 0x100
endif

36
lib/rsa/rsa-sign.c
View File

@ -9,6 +9,7 @@
#include <string.h>
#include <image.h>
#include <time.h>
#include <generated/autoconf.h>
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
@ -700,12 +701,18 @@ int rsa_get_params(RSA *key, uint64_t *exponent, uint32_t *n0_invp,
return ret;
}
static void rsa_convert_big_endian(uint32_t *dst, const uint32_t *src, int len)
static void rsa_convert_big_endian(uint32_t *dst, const uint32_t *src,
int total_len, int convert_len)
{
int i;
int total_wd, convert_wd, i;
for (i = 0; i < len; i++)
dst[i] = fdt32_to_cpu(src[len - 1 - i]);
if (total_len < convert_len)
convert_len = total_len;
total_wd = total_len / sizeof(uint32_t);
convert_wd = convert_len / sizeof(uint32_t);
for (i = 0; i < convert_wd; i++)
dst[i] = fdt32_to_cpu(src[total_wd - 1 - i]);
}
static int rsa_set_key_hash(void *keydest, int key_node,
@ -717,12 +724,11 @@ static int rsa_set_key_hash(void *keydest, int key_node,
char hash_c[] = "hash@c";
char hash_np[] = "hash@np";
char *rsa_key;
int key_word;
int hash_node;
int value_len;
int ret = -ENOSPC;
rsa_key = malloc(key_len * 3);
rsa_key = calloc(key_len * 3, sizeof(char));
if (!rsa_key)
return -ENOSPC;
@ -734,14 +740,13 @@ static int rsa_set_key_hash(void *keydest, int key_node,
goto err_nospc;
n = rsa_key;
e = rsa_key + key_len;
key_word = key_len / sizeof(uint32_t);
rsa_convert_big_endian(n, rsa_n, key_word);
rsa_convert_big_endian(e, rsa_e, key_word);
e = rsa_key + CONFIG_RSA_N_SIZE;
rsa_convert_big_endian(n, rsa_n, key_len, CONFIG_RSA_N_SIZE);
rsa_convert_big_endian(e, rsa_e, key_len, CONFIG_RSA_E_SIZE);
/* hash@c node: n, e, c */
c = rsa_key + key_len * 2;
rsa_convert_big_endian(c, rsa_c, key_word);
c = rsa_key + CONFIG_RSA_N_SIZE + CONFIG_RSA_E_SIZE;
rsa_convert_big_endian(c, rsa_c, key_len, CONFIG_RSA_C_SIZE);
hash_node = fdt_add_subnode(keydest, key_node, hash_c);
if (hash_node < 0)
goto err_nospc;
@ -756,13 +761,14 @@ static int rsa_set_key_hash(void *keydest, int key_node,
goto err_nospc;
/* hash@np node: n, e, np */
np = rsa_key + key_len * 2;
rsa_convert_big_endian(np, rsa_np, key_word);
np = rsa_key + CONFIG_RSA_N_SIZE + CONFIG_RSA_E_SIZE;
rsa_convert_big_endian(np, rsa_np, key_len, CONFIG_RSA_C_SIZE);
hash_node = fdt_add_subnode(keydest, key_node, hash_np);
if (hash_node < 0)
goto err_nospc;
ret = calculate_hash(rsa_key, key_len * 2 + 20, csum_algo, value, &value_len);
ret = calculate_hash(rsa_key, CONFIG_RSA_N_SIZE + CONFIG_RSA_E_SIZE + CONFIG_RSA_C_SIZE,
csum_algo, value, &value_len);
if (ret)
goto err_nospc;
ret = fdt_setprop(keydest, hash_node, FIT_VALUE_PROP, value, value_len);