1 files changed, 86 insertions, 0 deletions
diff --git a/security/nss/fuzz/mpi_helper.h b/security/nss/fuzz/mpi_helper.h
new file mode 100644
index 000000000..17383744b
--- /dev/null
+++ b/security/nss/fuzz/mpi_helper.h
@@ -0,0 +1,86 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Helper functions for MPI fuzzing targets. */
+
+#ifndef mpi_helper_h__
+#define mpi_helper_h__
+
+#include <iostream>
+#include <string>
+#include <tuple>
+#include <vector>
+
+#include "hasht.h"
+#include "mpi.h"
+
+#include <openssl/bn.h>
+
+void check_equal(BIGNUM *b, mp_int *m, size_t max_size);
+void parse_input(const uint8_t *data, size_t size, BIGNUM *A, BIGNUM *B,
+                 mp_int *a, mp_int *b);
+void parse_input(const uint8_t *data, size_t size, BIGNUM *A, mp_int *a);
+std::tuple<BIGNUM *, mp_int> get_modulus(const uint8_t *data, size_t size,
+                                         BN_CTX *ctx);
+
+// Initialise MPI and BN variables
+// XXX: Also silence unused variable warnings for R.
+#define INIT_FOUR_NUMBERS                \
+  mp_int a, b, c, r;                     \
+  mp_int *m1 = nullptr;                  \
+  BN_CTX *ctx = BN_CTX_new();            \
+  BN_CTX_start(ctx);                     \
+  BIGNUM *A = BN_CTX_get(ctx);           \
+  BIGNUM *B = BN_CTX_get(ctx);           \
+  BIGNUM *C = BN_CTX_get(ctx);           \
+  BIGNUM *R = BN_CTX_get(ctx);           \
+  assert(mp_init(&a) == MP_OKAY);        \
+  assert(mp_init(&b) == MP_OKAY);        \
+  assert(mp_init(&c) == MP_OKAY);        \
+  assert(mp_init(&r) == MP_OKAY);        \
+  size_t max_size = 2 * size + 1;        \
+  parse_input(data, size, A, B, &a, &b); \
+  do {                                   \
+    (void)(R);                           \
+  } while (0);
+
+// Initialise MPI and BN variables
+// XXX: Also silence unused variable warnings for B.
+#define INIT_THREE_NUMBERS        \
+  mp_int a, b, c;                 \
+  BN_CTX *ctx = BN_CTX_new();     \
+  BN_CTX_start(ctx);              \
+  BIGNUM *A = BN_CTX_get(ctx);    \
+  BIGNUM *B = BN_CTX_get(ctx);    \
+  BIGNUM *C = BN_CTX_get(ctx);    \
+  assert(mp_init(&a) == MP_OKAY); \
+  assert(mp_init(&b) == MP_OKAY); \
+  assert(mp_init(&c) == MP_OKAY); \
+  size_t max_size = 4 * size + 1; \
+  parse_input(data, size, A, &a); \
+  do {                            \
+    (void)(B);                    \
+  } while (0);
+
+#define CLEANUP_AND_RETURN \
+  mp_clear(&a);            \
+  mp_clear(&b);            \
+  mp_clear(&c);            \
+  mp_clear(&r);            \
+  if (m1) {                \
+    mp_clear(m1);          \
+  }                        \
+  BN_CTX_end(ctx);         \
+  BN_CTX_free(ctx);        \
+  return 0;
+
+#define CLEANUP_AND_RETURN_THREE \
+  mp_clear(&a);                  \
+  mp_clear(&b);                  \
+  mp_clear(&c);                  \
+  BN_CTX_end(ctx);               \
+  BN_CTX_free(ctx);              \
+  return 0;
+
+#endif  // mpi_helper_h__