/*
* First stumblings towards a test harness for RSA using Cryptech
* ModExp core.
*
* For the moment this just does modular exponentiation tests using
* RSA keys and pre-formatted data-to-be-signed, without attempting
* CRT or any of the other clever stuff we should be doing. This is
* not usable for any sane purpose other than testing.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "cryptech.h"
#include "test-rsa.h"
/*
* Constant value to use with hal_io_write() when we don't want
* a read-back check thus aren't using set_register().
*/
static const uint8_t one[] = { 0, 0, 0, 1 };
/*
* Debugging aid: check a result, report on failure.
*/
#define check(_expr_) \
do { \
if ((_expr_) != 0) \
return printf("%s failed\n", #_expr_), 1; \
} while (0)
/*
* Set an ordinary register, with read-back check.
*/
static int _set_register(const off_t addr,
const char * const name,
uint32_t value)
{
uint8_t w1[4], w2[4];
int i;
assert(name != NULL);
for (i = 3; i >= 0; i--) {
w1[i] = value & 0xFF;
value >>= 8;
}
printf("Setting register %#lx %s\n", (unsigned long) addr, name);
check(hal_io_write(addr, w1, sizeof(w1)));
check(hal_io_read(addr, w2, sizeof(w2)));
if (memcmp(w1, w2, sizeof(w1)) != 0)
printf("MISMATCH\n");
printf("\n");
return 0;
}
/*
* Get value of a block memory.
*/
static int _get_blockmem(const off_t reset_addr,
const char * const reset_name,
const off_t data_addr,
const char * const data_name,
uint8_t *value,
const size_t length)
{
size_t i;
assert(reset_name != NULL && data_name != NULL && value != NULL && length % 4 == 0 && length <= sizeof(value));
printf("Setting register %#lx %s\n", (unsigned long) reset_addr, reset_name);
check(hal_io_write(reset_addr, one, sizeof(one)));
printf("\n");
printf("Getting blockmem %#lx %s\n", (unsigned long) data_addr, data_name);
for (i = 0; i < length; i += 4)
check(hal_io_read(data_addr, &value[i], 4));
return 0;
}
/*
* Set value of a block memory, with read-back check.
*/
static int _set_blockmem(const off_t reset_addr,
const char * const reset_name,
const off_t data_addr,
const char * const data_name,
const uint8_t * const value,
const size_t value_length,
uint8_t *buffer,
const size_t buffer_length)
{
size_t i;
assert(reset_name != NULL && data_name != NULL && value != NULL && buffer_length >= value_length && value_length % 4 == 0);
printf("Setting register %#lx %s\n", (unsigned long) reset_addr, reset_name);
check(hal_io_write(reset_addr, one, sizeof(one)));
printf("\n");
printf("Setting blockmem %#lx %s\n", (unsigned long) data_addr, data_name);
for (i = 0; i < value_length; i += 4)
check(hal_io_write(data_addr, &value[i], 4));
printf("\n");
check(_get_blockmem(reset_addr, reset_name, data_addr, data_name, buffer, value_length));
if (memcmp(value, buffer, value_length))
printf("MISMATCH\n");
printf("\n");
return 0;
}
/*
* Syntactic sugar.
*/
#define set_register(_field_, _value_) \
_set_register(_field_, #_field_, _value_)
#define get_blockmem(_field_, _value_) \
_get_blockmem(_field_##_PTR_RST, #_field_ "_PTR_RST", _field_##_DATA, #_field_ "_DATA", _value_, sizeof(_value_))
#define set_blockmem(_field_, _value_, _buffer_) \
_set_blockmem(_field_##_PTR_RST, #_field_ "_PTR_RST", _field_##_DATA, #_field_ "_DATA", (_value_).val, (_value_).len, _buffer_, sizeof(_buffer_))
/*
* Test driver.
*/
static int test(const rsa_tc_t * const tc)
{
uint8_t b[4096];
printf("Signature test for %lu-bit RSA key\n", (unsigned long) tc->size);
check(set_blockmem(MODEXP_MODULUS, tc->n, b));
check(set_blockmem(MODEXP_MESSAGE, tc->m, b));
check(set_register(MODEXP_MODULUS_LENGTH, tc->n.len / 4));
check(set_blockmem(MODEXP_EXPONENT, tc->d, b));
check(set_register(MODEXP_EXPONENT_LENGTH, tc->d.len / 4));
printf("Checking ready status\n");
check(hal_io_wait_ready(MODEXP_ADDR_STATUS));
printf("\n");
check(set_register(MODEXP_ADDR_CTRL, 1));
printf("Waiting for ready\n");
check(hal_io_wait(MODEXP_ADDR_STATUS, STATUS_READY, NULL));
printf("\n");
check(get_blockmem(MODEXP_RESULT, b));
printf("Comparing results with known value...");
if (memcmp(b, tc->s.val, tc->s.len))
printf("MISMATCH\n");
else
printf("OK\n");
printf("Verification test for %lu-bit RSA key\n", (unsigned long) tc->size);
check(set_blockmem(MODEXP_MODULUS, tc->n, b));
check(set_blockmem(MODEXP_MESSAGE, tc->m, b));
check(set_register(MODEXP_MODULUS_LENGTH, tc->n.len / 4));
check(set_blockmem(MODEXP_EXPONENT, tc->e, b));
check(set_register(MODEXP_EXPONENT_LENGTH, tc->e.len / 4));
printf("Checking ready status\n");
check(hal_io_wait_ready(MODEXP_ADDR_STATUS));
printf("\n");
check(set_register(MODEXP_ADDR_CTRL, 1));
printf("Waiting for ready\n");
check(hal_io_wait(MODEXP_ADDR_STATUS, STATUS_READY, NULL));
printf("\n");
check(get_blockmem(MODEXP_RESULT, b));
printf("Comparing results with known value...");
if (memcmp(b, tc->m.val, tc->m.len))
printf("MISMATCH\n");
else
printf("OK\n");
return 0;
}
int main(int argc, char *argv[])
{
uint8_t name[8], version[4];
int i;
/*
* Initialize EIM and report what core we're running.
*/
check(hal_io_read(MODEXP_ADDR_NAME0, name, sizeof(name)));
check(hal_io_read(MODEXP_ADDR_VERSION, version, sizeof(version)));
printf("\"%8.8s\" \"%4.4s\"\n\n", name, version);
hal_io_set_debug(1);
/*
* Run all the test cases.
*/
for (i = 0; i < sizeof(rsa_tc)/sizeof(*rsa_tc); i++)
if (test(&rsa_tc[i]))
return 1;
return 0;
}
