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ipod_touch_pke.c
158 lines (128 loc) · 4.48 KB
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ipod_touch_pke.c
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#include "hw/arm/ipod_touch_pke.h"
#include <openssl/bn.h>
#include <openssl/bio.h>
static uint8_t *datahex(char* string) {
if(string == NULL)
return NULL;
size_t slength = strlen(string);
if((slength % 2) != 0) // must be even
return NULL;
size_t dlength = slength / 2;
uint8_t* data = malloc(dlength);
memset(data, 0, dlength);
size_t index = 0;
while (index < slength) {
char c = string[index];
int value = 0;
if(c >= '0' && c <= '9')
value = (c - '0');
else if (c >= 'A' && c <= 'F')
value = (10 + (c - 'A'));
else if (c >= 'a' && c <= 'f')
value = (10 + (c - 'a'));
else {
free(data);
return NULL;
}
data[(index/2)] += value << (((index + 1) % 2) * 4);
index++;
}
return data;
}
static uint64_t ipod_touch_pke_read(void *opaque, hwaddr offset, unsigned size)
{
IPodTouchPKEState *s = (IPodTouchPKEState *)opaque;
//printf("%s: offset 0x%08x\n", __FUNCTION__, offset);
switch(offset) {
case REG_PKE_SEG_SIZE:
return s->seg_size_reg;
case REG_PKE_SEG_START ... (REG_PKE_SEG_START + 1024):
{
uint32_t *res = (uint32_t *)s->segments;
return res[(offset - REG_PKE_SEG_START) / 4];
}
default:
break;
}
return 0;
}
static void ipod_touch_pke_write(void *opaque, hwaddr offset, uint64_t value, unsigned size)
{
IPodTouchPKEState *s = (IPodTouchPKEState *)opaque;
//printf("%s: offset 0x%08x value 0x%08x\n", __FUNCTION__, offset, value);
switch(offset) {
case 0x0:
s->num_started = 0;
break;
case 0x10:
break;
case REG_PKE_SEG_START ... (REG_PKE_SEG_START + 1024):
{
uint32_t *segments_cast = (uint32_t *)s->segments;
segments_cast[(offset - REG_PKE_SEG_START) / 4] = value;
break;
}
case REG_PKE_START:
{
s->num_started++;
if(s->num_started == 5) { // TODO this is arbitrary!
BIGNUM *mod_bn = BN_lebin2bn(s->segments, s->segment_size, NULL);
BIGNUM *base_bn = BN_lebin2bn(s->segments + s->segment_size, s->segment_size, NULL);
BIGNUM *exp_bn = BN_new();
BN_dec2bn(&exp_bn,"65537");
// BN_print(BIO_new_fp(stdout, BIO_NOCLOSE), exp_bn);
// printf("\n\n");
BIGNUM *res = BN_new();
BN_CTX *ctx = BN_CTX_new();
BN_mod_exp(res, base_bn, exp_bn, mod_bn, ctx);
// BN_print(BIO_new_fp(stdout, BIO_NOCLOSE), res);
// printf("\n\n");
char *res_hex = datahex(BN_bn2hex(res));
// copy this into SEG1 - note that the hex conversion removes the first 0x00 bytes so we add it back and shift everything to the right one place.
for(int i = 0; i < (s->segment_size - 1); i++) { s->segments[s->segment_size + s->segment_size - 2 - i] = res_hex[i]; }
s->segments[s->segment_size + s->segment_size - 1] = 0x0;
}
break;
}
case REG_PKE_SEG_SIZE:
s->seg_size_reg = value;
uint32_t size_bit = (s->seg_size_reg >> 6);
if(size_bit == 0) { s->segment_size = 256; }
else if(size_bit == 1) { s->segment_size = 128; }
else { }
break;
case REG_PKE_SWRESET:
s->num_started = 0;
break;
default:
break;
}
}
static const MemoryRegionOps pke_ops = {
.read = ipod_touch_pke_read,
.write = ipod_touch_pke_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void ipod_touch_pke_init(Object *obj)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
DeviceState *dev = DEVICE(sbd);
IPodTouchPKEState *s = IPOD_TOUCH_PKE(dev);
memory_region_init_io(&s->iomem, obj, &pke_ops, s, "pke", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
}
static void ipod_touch_pke_class_init(ObjectClass *klass, void *data)
{
}
static const TypeInfo ipod_touch_pke_info = {
.name = TYPE_IPOD_TOUCH_PKE,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IPodTouchPKEState),
.instance_init = ipod_touch_pke_init,
.class_init = ipod_touch_pke_class_init,
};
static void ipod_touch_machine_types(void)
{
type_register_static(&ipod_touch_pke_info);
}
type_init(ipod_touch_machine_types)