Add libotr/etc sources

1 files changed, 580 insertions, 0 deletions

diff --git a/libotr/libgcrypt-1.8.7/tests/mpitests.c b/libotr/libgcrypt-1.8.7/tests/mpitests.c
new file mode 100644
index 0000000..18156d1
--- /dev/null
+++ b/libotr/libgcrypt-1.8.7/tests/mpitests.c
@@ -0,0 +1,580 @@
+/* mpitests.c  -  basic mpi tests
+ *	Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
+ * Copyright (C) 2013 g10 Code GmbH
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#ifdef _GCRYPT_IN_LIBGCRYPT
+# include "../src/gcrypt-int.h"
+#else
+# include <gcrypt.h>
+#endif
+
+#define PGM "mpitests"
+#include "t-common.h"
+
+
+/* Set up some test patterns */
+
+/* 48 bytes with value 1: this results in 8 limbs for 64bit limbs, 16limb for 32 bit limbs */
+unsigned char ones[] = {
+  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+  0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
+};
+
+/* 48 bytes with value 2: this results in 8 limbs for 64bit limbs, 16limb for 32 bit limbs */
+unsigned char twos[] = {
+  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
+  0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02
+};
+
+/* 48 bytes with value 3: this results in 8 limbs for 64bit limbs, 16limb for 32 bit limbs */
+unsigned char threes[] = {
+  0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+  0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
+  0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03
+};
+
+/* 48 bytes with value 0x80: this results in 8 limbs for 64bit limbs, 16limb for 32 bit limbs */
+unsigned char eighties[] = {
+  0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+  0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80,
+  0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80
+};
+
+/* 48 bytes with value 0xff: this results in 8 limbs for 64bit limbs, 16limb for 32 bit limbs */
+unsigned char manyff[] = {
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
+
+
+static int
+test_const_and_immutable (void)
+{
+  gcry_mpi_t one, second_one;
+
+  one = gcry_mpi_set_ui (NULL, 1);
+  if (gcry_mpi_get_flag (one, GCRYMPI_FLAG_IMMUTABLE)
+      || gcry_mpi_get_flag (one, GCRYMPI_FLAG_CONST))
+    die ("immutable or const flag initially set\n");
+
+  second_one = gcry_mpi_copy (one);
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("immutable flag set after copy\n");
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_CONST))
+    die ("const flag set after copy\n");
+  gcry_mpi_release (second_one);
+
+  gcry_mpi_set_flag (one, GCRYMPI_FLAG_IMMUTABLE);
+  if (!gcry_mpi_get_flag (one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("failed to set immutable flag\n");
+  if (gcry_mpi_get_flag (one, GCRYMPI_FLAG_CONST))
+    die ("const flag unexpectly set\n");
+
+  second_one = gcry_mpi_copy (one);
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("immutable flag not cleared after copy\n");
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_CONST))
+    die ("const flag unexpectly set after copy\n");
+  gcry_mpi_release (second_one);
+
+  gcry_mpi_clear_flag (one, GCRYMPI_FLAG_IMMUTABLE);
+  if (gcry_mpi_get_flag (one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("failed to clear immutable flag\n");
+  if (gcry_mpi_get_flag (one, GCRYMPI_FLAG_CONST))
+    die ("const flag unexpectly set\n");
+
+  gcry_mpi_set_flag (one, GCRYMPI_FLAG_CONST);
+  if (!gcry_mpi_get_flag (one, GCRYMPI_FLAG_CONST))
+    die ("failed to set const flag\n");
+  if (!gcry_mpi_get_flag (one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("failed to set immutable flag with const flag\n");
+
+  second_one = gcry_mpi_copy (one);
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("immutable flag not cleared after copy\n");
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_CONST))
+    die ("const flag not cleared after copy\n");
+  gcry_mpi_release (second_one);
+
+  gcry_mpi_clear_flag (one, GCRYMPI_FLAG_IMMUTABLE);
+  if (!gcry_mpi_get_flag (one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("clearing immutable flag not ignored for a constant MPI\n");
+  if (!gcry_mpi_get_flag (one, GCRYMPI_FLAG_CONST))
+    die ("const flag unexpectly cleared\n");
+
+
+  second_one = gcry_mpi_set (NULL, GCRYMPI_CONST_ONE);
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("immutable flag not cleared by mpi_set (NULL,x)\n");
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_CONST))
+    die ("const flag not cleared by mpi_set (NULL,x)\n");
+  gcry_mpi_release (second_one);
+
+  second_one = gcry_mpi_set_ui (NULL, 42);
+  gcry_mpi_set (second_one, GCRYMPI_CONST_ONE);
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_IMMUTABLE))
+    die ("immutable flag not cleared after mpi_set (a,x)\n");
+  if (gcry_mpi_get_flag (second_one, GCRYMPI_FLAG_CONST))
+    die ("const flag not cleared mpi_set (a,x)\n");
+  gcry_mpi_release (second_one);
+
+
+  /* Due to the the constant flag the release below should be a NOP
+     and will leak memory.  */
+  gcry_mpi_release (one);
+  return 1;
+}
+
+
+static void
+test_opaque (void)
+{
+  gcry_mpi_t a;
+  char *p;
+  unsigned int nbits;
+
+  p = gcry_xstrdup ("This is a test buffer");
+  a = gcry_mpi_set_opaque (NULL, p, 21*8+1); /* (a non byte aligned length) */
+
+  if (!gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE))
+    die ("opaque flag not set\n");
+
+  p = gcry_mpi_get_opaque (a, &nbits);
+  if (!p)
+    die ("gcry_mpi_get_opaque returned NULL\n");
+  if (nbits != 21*8+1)
+    die ("gcry_mpi_get_opaque returned a changed bit size\n");
+  if (strcmp (p, "This is a test buffer"))
+    die ("gcry_mpi_get_opaque returned a changed buffer\n");
+
+  if (debug)
+    gcry_log_debugmpi ("mpi", a);
+  gcry_mpi_release (a);
+
+  p = gcry_xstrdup ("This is a test buffer");
+  a = gcry_mpi_set_opaque_copy (NULL, p, 21*8+1);
+  gcry_free (p);
+
+  if (!gcry_mpi_get_flag (a, GCRYMPI_FLAG_OPAQUE))
+    die ("opaque flag not set\n");
+
+  p = gcry_mpi_get_opaque (a, &nbits);
+  if (!p)
+    die ("gcry_mpi_get_opaque returned NULL\n");
+  if (nbits != 21*8+1)
+    die ("gcry_mpi_get_opaque returned a changed bit size\n");
+  if (strcmp (p, "This is a test buffer"))
+    die ("gcry_mpi_get_opaque returned a changed buffer\n");
+
+  if (debug)
+    gcry_log_debugmpi ("mpi", a);
+
+  gcry_mpi_release (a);
+}
+
+
+static void
+test_maxsize (void)
+{
+  gpg_error_t err;
+  gcry_mpi_t a;
+  char buffer[2+2048]; /* For PGP: 2 length bytes and 16384 bits.  */
+
+  memset (buffer, 0x55, sizeof buffer);
+
+  /* We use a short buffer but a give a too large length to simulate a
+   * programming error.  In case this test fails (i.e. die() is
+   * called) the scan function may have access data outside of BUFFER
+   * which may result in a segv but we ignore that to avoid actually
+   * allocating such a long buffer.  */
+  err = gcry_mpi_scan (&a, GCRYMPI_FMT_USG, buffer, 16*1024*1024 +1, NULL);
+  if (gpg_err_code (err) != GPG_ERR_INV_OBJ)
+    die ("gcry_mpi_scan does not detect its generic input limit\n");
+
+  /* Now test the PGP limit.  The scan code check the two length bytes
+   * from the buffer and thus it is sufficient to fake them.  */
+  buffer[0] = (16385 >> 8);
+  buffer[1] = (16385 & 0xff);
+  err = gcry_mpi_scan (&a, GCRYMPI_FMT_PGP, buffer, sizeof buffer, NULL);
+  if (gpg_err_code (err) != GPG_ERR_INV_OBJ)
+    die ("gcry_mpi_scan does not detect the PGP input limit\n");
+
+  buffer[0] = (16384 >> 8);
+  buffer[1] = (16384 & 0xff);
+
+  err = gcry_mpi_scan (&a, GCRYMPI_FMT_PGP, buffer, sizeof buffer, NULL);
+  if (err)
+    die ("gcry_mpi_scan did not parse a large PGP: %s\n", gpg_strerror (err));
+  gcry_mpi_release (a);
+}
+
+
+static void
+test_cmp (void)
+{
+  gpg_error_t rc;
+  gcry_mpi_t zero, zero2;
+  gcry_mpi_t one;
+  gcry_mpi_t two;
+  gcry_mpi_t all_ones;
+  gcry_mpi_t opa1, opa2;
+  gcry_mpi_t opa1s, opa2s;
+  gcry_mpi_t opa0, opa02;
+
+  zero = gcry_mpi_new (0);
+  zero2= gcry_mpi_set_ui (NULL, 0);
+  one  = gcry_mpi_set_ui (NULL, 1);
+  two  = gcry_mpi_set_ui (NULL, 2);
+  rc = gcry_mpi_scan (&all_ones, GCRYMPI_FMT_USG, ones, sizeof(ones), NULL);
+  if (rc)
+    die ("scanning number failed at line %d", __LINE__);
+  opa0  = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("a"), 0);
+  opa02 = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("b"), 0);
+  opa1  = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("aaaaaaaaaaaaaaaa"), 16*8);
+  opa1s = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("a"), 1*8);
+  opa2  = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("bbbbbbbbbbbbbbbb"), 16*8);
+  opa2s = gcry_mpi_set_opaque (NULL, gcry_xstrdup ("b"), 1*8);
+
+
+  /* Single limb test with cmp_ui */
+  if (gcry_mpi_cmp_ui (zero, 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp_ui (zero, 1) < 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp_ui (zero, (-1)) < 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+
+  if (gcry_mpi_cmp_ui (two, 2))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp_ui (two, 3) < 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp_ui (two, 1) > 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+
+  /* Multi limb tests with cmp_ui.  */
+  if (!(gcry_mpi_cmp_ui (all_ones, 0) > 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp_ui (all_ones, (-1)) > 0))
+    fail ("mpi_cmp_ui failed at line %d", __LINE__);
+
+  /* Single limb test with cmp */
+  if (gcry_mpi_cmp (zero, zero2))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (zero, one) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (one, zero) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+
+  gcry_mpi_neg (one, one);
+  if (!(gcry_mpi_cmp (zero, one) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (one, zero) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (one, two) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  gcry_mpi_neg (one, one);
+
+  if (!(gcry_mpi_cmp (one, two) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (two, one) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (one, all_ones) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+
+  /* Tests with opaque values.  */
+  if (!(gcry_mpi_cmp (opa1, one) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (one, opa1) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa0, opa02) == 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa1s, opa1) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa2, opa1s) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa1, opa2) < 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa2, opa1) > 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+  if (!(gcry_mpi_cmp (opa1, opa1) == 0))
+    fail ("mpi_cmp failed at line %d", __LINE__);
+
+
+  gcry_mpi_release(opa2s);
+  gcry_mpi_release(opa2);
+  gcry_mpi_release(opa1s);
+  gcry_mpi_release(opa1);
+  gcry_mpi_release(opa02);
+  gcry_mpi_release(opa0);
+  gcry_mpi_release(all_ones);
+  gcry_mpi_release(two);
+  gcry_mpi_release(one);
+  gcry_mpi_release(zero2);
+  gcry_mpi_release(zero);
+}
+
+
+static int
+test_add (void)
+{
+  gcry_mpi_t one;
+  gcry_mpi_t two;
+  gcry_mpi_t ff;
+  gcry_mpi_t result;
+  unsigned char* pc;
+
+  gcry_mpi_scan(&one, GCRYMPI_FMT_USG, ones, sizeof(ones), NULL);
+  gcry_mpi_scan(&two, GCRYMPI_FMT_USG, twos, sizeof(twos), NULL);
+  gcry_mpi_scan(&ff, GCRYMPI_FMT_USG, manyff, sizeof(manyff), NULL);
+  result = gcry_mpi_new(0);
+
+  gcry_mpi_add(result, one, two);
+  gcry_mpi_aprint(GCRYMPI_FMT_HEX, &pc, NULL, result);
+  if (debug)
+    gcry_log_debug ("Result of one plus two:\n%s\n", pc);
+  gcry_free(pc);
+
+  gcry_mpi_add(result, ff, one);
+  gcry_mpi_aprint(GCRYMPI_FMT_HEX, &pc, NULL, result);
+  if (debug)
+    gcry_log_debug ("Result of ff plus one:\n%s\n", pc);
+  gcry_free(pc);
+
+  gcry_mpi_release(one);
+  gcry_mpi_release(two);
+  gcry_mpi_release(ff);
+  gcry_mpi_release(result);
+  return 1;
+}
+
+
+static int
+test_sub (void)
+{
+  gcry_mpi_t one;
+  gcry_mpi_t two;
+  gcry_mpi_t result;
+  unsigned char* pc;
+
+  gcry_mpi_scan(&one, GCRYMPI_FMT_USG, ones, sizeof(ones), NULL);
+  gcry_mpi_scan(&two, GCRYMPI_FMT_USG, twos, sizeof(twos), NULL);
+  result = gcry_mpi_new(0);
+  gcry_mpi_sub(result, two, one);
+
+  gcry_mpi_aprint(GCRYMPI_FMT_HEX, &pc, NULL, result);
+  if (debug)
+    gcry_log_debug ("Result of two minus one:\n%s\n", pc);
+  gcry_free(pc);
+
+  gcry_mpi_release(one);
+  gcry_mpi_release(two);
+  gcry_mpi_release(result);
+  return 1;
+}
+
+
+static int
+test_mul (void)
+{
+  gcry_mpi_t two;
+  gcry_mpi_t three;
+  gcry_mpi_t result;
+  unsigned char* pc;
+
+  gcry_mpi_scan(&two, GCRYMPI_FMT_USG, twos, sizeof(twos), NULL);
+  gcry_mpi_scan(&three, GCRYMPI_FMT_USG, threes, sizeof(threes), NULL);
+  result = gcry_mpi_new(0);
+  gcry_mpi_mul(result, two, three);
+
+  gcry_mpi_aprint(GCRYMPI_FMT_HEX, &pc, NULL, result);
+  if (debug)
+    gcry_log_debug ("Result of two mul three:\n%s\n", pc);
+  gcry_free(pc);
+
+  gcry_mpi_release(two);
+  gcry_mpi_release(three);
+  gcry_mpi_release(result);
+  return 1;
+}
+
+
+/* What we test here is that we don't overwrite our args and that
+   using the same mpi for several args works.  */
+static int
+test_powm (void)
+{
+  int b_int = 17;
+  int e_int = 3;
+  int m_int = 19;
+  gcry_mpi_t base = gcry_mpi_set_ui (NULL, b_int);
+  gcry_mpi_t exp = gcry_mpi_set_ui (NULL, e_int);
+  gcry_mpi_t mod = gcry_mpi_set_ui (NULL, m_int);
+  gcry_mpi_t res = gcry_mpi_new (0);
+
+  gcry_mpi_powm (res, base, exp, mod);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (exp, e_int))
+    die ("test_powm_ui failed for exp at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (mod, m_int))
+    die ("test_powm failed for mod at %d\n", __LINE__);
+
+  /* Check using base for the result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui (exp, e_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (base, base, exp, mod);
+  if (gcry_mpi_cmp (res, base))
+    die ("test_powm failed at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (exp, e_int))
+    die ("test_powm_ui failed for exp at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (mod, m_int))
+    die ("test_powm failed for mod at %d\n", __LINE__);
+
+  /* Check using exp for the result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui (exp, e_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (exp, base, exp, mod);
+  if (gcry_mpi_cmp (res, exp))
+    die ("test_powm failed at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (mod, m_int))
+    die ("test_powm failed for mod at %d\n", __LINE__);
+
+  /* Check using mod for the result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui (exp, e_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (mod, base, exp, mod);
+  if (gcry_mpi_cmp (res, mod))
+    die ("test_powm failed at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (exp, e_int))
+    die ("test_powm_ui failed for exp at %d\n", __LINE__);
+
+  /* Now check base ^ base mod mod.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (res, base, base, mod);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (mod, m_int))
+    die ("test_powm failed for mod at %d\n", __LINE__);
+
+  /* Check base ^ base mod mod with base as result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (base, base, base, mod);
+  if (gcry_mpi_cmp (res, base))
+    die ("test_powm failed at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (mod, m_int))
+    die ("test_powm failed for mod at %d\n", __LINE__);
+
+  /* Check base ^ base mod mod with mod as result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (mod, base, base, mod);
+  if (gcry_mpi_cmp (res, mod))
+    die ("test_powm failed at %d\n", __LINE__);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+
+  /* Now check base ^ base mod base.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_powm (res, base, base, base);
+  if (gcry_mpi_cmp_ui (base, b_int))
+    die ("test_powm failed for base at %d\n", __LINE__);
+
+  /* Check base ^ base mod base with base as result.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_powm (base, base, base, base);
+  if (gcry_mpi_cmp (res, base))
+    die ("test_powm failed at %d\n", __LINE__);
+
+  /* Check for a case: base is negative and expo is even.  */
+  gcry_mpi_set_ui (base, b_int);
+  gcry_mpi_neg (base, base);
+  gcry_mpi_set_ui (exp, e_int * 2);
+  gcry_mpi_set_ui(mod, m_int);
+  gcry_mpi_powm (res, base, exp, mod);
+  /* Result should be positive and it's 7 = (-17)^6 mod 19.  */
+  if (gcry_mpi_is_neg (res) || gcry_mpi_cmp_ui (res, 7))
+    {
+      if (verbose)
+        {
+          fprintf (stderr, "is_neg: %d\n", gcry_mpi_is_neg (res));
+          fprintf (stderr, "mpi: ");
+          gcry_mpi_dump (res);
+          putc ('\n', stderr);
+        }
+      die ("test_powm failed for negative base at %d\n", __LINE__);
+    }
+
+  gcry_mpi_release (base);
+  gcry_mpi_release (exp);
+  gcry_mpi_release (mod);
+  gcry_mpi_release (res);
+  /* Fixme: We should add the rest of the cases of course.  */
+
+
+
+  return 1;
+}
+
+
+int
+main (int argc, char* argv[])
+{
+  if (argc > 1 && !strcmp (argv[1], "--verbose"))
+    verbose = 1;
+  else if (argc > 1 && !strcmp (argv[1], "--debug"))
+    verbose = debug = 1;
+
+  if (!gcry_check_version (GCRYPT_VERSION))
+    {
+      fputs ("version mismatch\n", stderr);
+      exit (1);
+    }
+  xgcry_control(GCRYCTL_DISABLE_SECMEM);
+
+  test_const_and_immutable ();
+  test_opaque ();
+  test_maxsize ();
+  test_cmp ();
+  test_add ();
+  test_sub ();
+  test_mul ();
+  test_powm ();
+
+  return !!error_count;
+}