First pass at RSA tests.

1 files changed, 215 insertions, 0 deletions

diff --git a/tests/test-rsa.c b/tests/test-rsa.c
new file mode 100644
index 0000000..95b366a
--- /dev/null
+++ b/tests/test-rsa.c
@@ -0,0 +1,215 @@
+/*
+ * 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;
+}