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fixes and enhancements

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This commit is contained in:
NIIBE Yutaka
2010-09-10 01:25:44 +09:00
parent 338b4eac03
commit 0335fde78b
10 changed files with 144 additions and 19 deletions
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27
src/random.c
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@@ -30,9 +30,23 @@ extern void *_binary_random_bits_start;
const uint8_t *
random_bytes_get (void)
{
uint32_t addr;
uint32_t addr, addr0;
addr = (uint32_t)&_binary_random_bits_start + ((hardclock () << 5) & 0x3e0);
addr0 = addr;
while (1)
{
if (*(uint32_t *)addr != 0)
break;
addr += 32;
if (addr >= ((uint32_t)&_binary_random_bits_start) + 1024)
addr = ((uint32_t)&_binary_random_bits_start);
if (addr == addr0)
fatal ();
}
return (const uint8_t *)addr;
}
@@ -40,12 +54,19 @@ random_bytes_get (void)
void
random_bytes_free (const uint8_t *p)
{
(void)p;
int i;
uint32_t addr = (uint32_t)p;
for (i = 0; i < 16; i++)
flash_clear_halfword (addr+i*2);
}
uint32_t
get_random (void)
{
const uint32_t *p = (const uint32_t *)random_bytes_get ();
return *p;
uint32_t r = *p;
random_bytes_free ((const uint8_t *)p);
return r;
}