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lib: avb: implement the function get_random() 

Use the function get_timer to get the random
seed. Then the seed is used by function srand
to initialize the random data.

Change-Id: Iaae6a17d22b8e85fb4d4b6c6247cd11003b64eea
Signed-off-by: Jason Zhu <jason.zhu@rock-chips.com>
This commit is contained in:
Jason Zhu 2018-06-11 22:19:10 +08:00 committed by Kever Yang
parent c88f435110
commit 8d0db1d983
1 changed files with 18 additions and 0 deletions
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18
lib/avb/libavb_user/avb_ops_user.c
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@ -347,6 +347,23 @@ static void avb_set_key_version(AvbAtxOps* atx_ops,
#endif
}
AvbIOResult rk_get_random(AvbAtxOps* atx_ops,
size_t num_bytes,
uint8_t* output)
{
int i;
unsigned int seed;
seed = (unsigned int)get_timer(0);
for (i = 0; i < num_bytes; i++) {
srand(seed);
output[i] = (uint8_t)(rand());
seed = (unsigned int)(output[i]);
}
return 0;
}
AvbOps* avb_ops_user_new(void) {
AvbOps* ops;
@ -387,6 +404,7 @@ AvbOps* avb_ops_user_new(void) {
ops->atx_ops->read_permanent_attributes = avb_read_perm_attr;
ops->atx_ops->read_permanent_attributes_hash = avb_read_perm_attr_hash;
ops->atx_ops->set_key_version = avb_set_key_version;
ops->atx_ops->get_random = rk_get_random;
out:
return ops;