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/* t-convert.c - Tests for mpi print and scna functions
* 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
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdarg.h>
#define PGM "t-convert"
#include "t-common.h"
static void
showhex (const char *prefix, const void *buffer, size_t buflen)
{
const unsigned char *s;
if (!verbose)
return;
fprintf (stderr, "%s: %s ", PGM, prefix);
for (s= buffer; buflen; buflen--, s++)
fprintf (stderr, "%02x", *s);
putc ('\n', stderr);
}
/* Allocate a bit string consisting of '0' and '1' from the MPI A. Do
not return any leading zero bits. Caller needs to gcry_free the
result. */
static char *
mpi2bitstr_nlz (gcry_mpi_t a)
{
char *p, *buf;
size_t length = gcry_mpi_get_nbits (a);
if (!length)
{
buf = p = xmalloc (3);
*p++ = ' ';
*p++ = '0';
}
else
{
buf = p = xmalloc (length + 1 + 1);
*p++ = gcry_mpi_is_neg (a)? '-':' ';
while (length-- > 1)
*p++ = gcry_mpi_test_bit (a, length) ? '1':'0';
*p++ = gcry_mpi_test_bit (a, 0) ? '1':'0';
}
*p = 0;
return buf;
}
static void
showmpi (const char *prefix, gcry_mpi_t a)
{
char *bitstr;
if (!verbose)
return;
bitstr = mpi2bitstr_nlz (a);
fprintf (stderr, "%s: %s%s\n", PGM, prefix, bitstr);
xfree (bitstr);
}
/* Check that mpi_print does not return a negative zero. */
static void
negative_zero (void)
{
gpg_error_t err;
gcry_mpi_t a;
char *buf;
void *bufaddr = &buf;
struct { const char *name; enum gcry_mpi_format format; } fmts[] =
{
{ "STD", GCRYMPI_FMT_STD },
{ "PGP", GCRYMPI_FMT_PGP },
{ "SSH", GCRYMPI_FMT_SSH },
{ "HEX", GCRYMPI_FMT_HEX },
{ "USG", GCRYMPI_FMT_USG },
{ NULL, 0 }
};
int i;
if (debug)
info ("negative zero printing\n");
a = gcry_mpi_new (0);
for (i=0; fmts[i].name; i++)
{
err = gcry_mpi_aprint (fmts[i].format, bufaddr, NULL, a);
if (err)
fail ("error printing a zero as %s: %s\n",
fmts[i].name,gpg_strerror (err) );
else
gcry_free (buf);
}
/* With the current version of libgcrypt the next two statements
should set a to -0. */
gcry_mpi_sub_ui (a, a, 1);
gcry_mpi_add_ui (a, a, 1);
for (i=0; fmts[i].name; i++)
{
err = gcry_mpi_aprint (fmts[i].format, bufaddr, NULL, a);
if (err)
fail ("error printing a negative zero as %s: %s\n",
fmts[i].name,gpg_strerror (err) );
else
gcry_free (buf);
}
gcry_mpi_release (a);
}
static void
check_formats (void)
{
static struct {
int value;
struct {
const char *hex;
size_t stdlen;
const char *std;
size_t sshlen;
const char *ssh;
size_t usglen;
const char *usg;
size_t pgplen;
const char *pgp;
} a;
} data[] = {
{ 0, { "00",
0, "",
4, "\x00\x00\x00\x00",
0, "",
2, "\x00\x00"}
},
{ 1, { "01",
1, "\x01",
5, "\x00\x00\x00\x01\x01",
1, "\x01",
3, "\x00\x01\x01" }
},
{ 2, { "02",
1, "\x02",
5, "\x00\x00\x00\x01\x02",
1, "\x02",
3, "\x00\x02\x02" }
},
{ 127, { "7F",
1, "\x7f",
5, "\x00\x00\x00\x01\x7f",
1, "\x7f",
3, "\x00\x07\x7f" }
},
{ 128, { "0080",
2, "\x00\x80",
6, "\x00\x00\x00\x02\x00\x80",
1, "\x80",
3, "\x00\x08\x80" }
},
{ 129, { "0081",
2, "\x00\x81",
6, "\x00\x00\x00\x02\x00\x81",
1, "\x81",
3, "\x00\x08\x81" }
},
{ 255, { "00FF",
2, "\x00\xff",
6, "\x00\x00\x00\x02\x00\xff",
1, "\xff",
3, "\x00\x08\xff" }
},
{ 256, { "0100",
2, "\x01\x00",
6, "\x00\x00\x00\x02\x01\x00",
2, "\x01\x00",
4, "\x00\x09\x01\x00" }
},
{ 257, { "0101",
2, "\x01\x01",
6, "\x00\x00\x00\x02\x01\x01",
2, "\x01\x01",
4, "\x00\x09\x01\x01" }
},
{ -1, { "-01",
1, "\xff",
5, "\x00\x00\x00\x01\xff",
1,"\x01" }
},
{ -2, { "-02",
1, "\xfe",
5, "\x00\x00\x00\x01\xfe",
1, "\x02" }
},
{ -127, { "-7F",
1, "\x81",
5, "\x00\x00\x00\x01\x81",
1, "\x7f" }
},
{ -128, { "-0080",
1, "\x80",
5, "\x00\x00\x00\x01\x80",
1, "\x80" }
},
{ -129, { "-0081",
2, "\xff\x7f",
6, "\x00\x00\x00\x02\xff\x7f",
1, "\x81" }
},
{ -255, { "-00FF",
2, "\xff\x01",
6, "\x00\x00\x00\x02\xff\x01",
1, "\xff" }
},
{ -256, { "-0100",
2, "\xff\x00",
6, "\x00\x00\x00\x02\xff\x00",
2, "\x01\x00" }
},
{ -257, { "-0101",
2, "\xfe\xff",
6, "\x00\x00\x00\x02\xfe\xff",
2, "\x01\x01" }
},
{ 65535, { "00FFFF",
3, "\x00\xff\xff",
7, "\x00\x00\x00\x03\x00\xff\xff",
2, "\xff\xff",
4, "\x00\x10\xff\xff" }
},
{ 65536, { "010000",
3, "\x01\00\x00",
7, "\x00\x00\x00\x03\x01\x00\x00",
3, "\x01\x00\x00",
5, "\x00\x11\x01\x00\x00 "}
},
{ 65537, { "010001",
3, "\x01\00\x01",
7, "\x00\x00\x00\x03\x01\x00\x01",
3, "\x01\x00\x01",
5, "\x00\x11\x01\x00\x01" }
},
{ -65537, { "-010001",
3, "\xfe\xff\xff",
7, "\x00\x00\x00\x03\xfe\xff\xff",
3, "\x01\x00\x01" }
},
{ -65536, { "-010000",
3, "\xff\x00\x00",
7, "\x00\x00\x00\x03\xff\x00\x00",
3, "\x01\x00\x00" }
},
{ -65535, { "-00FFFF",
3, "\xff\x00\x01",
7, "\x00\x00\x00\x03\xff\x00\x01",
2, "\xff\xff" }
}
};
gpg_error_t err;
gcry_mpi_t a, b;
char *buf;
void *bufaddr = &buf;
int idx;
size_t buflen;
a = gcry_mpi_new (0);
for (idx=0; idx < DIM(data); idx++)
{
if (debug)
info ("print test %d\n", data[idx].value);
if (data[idx].value < 0)
{
gcry_mpi_set_ui (a, -data[idx].value);
gcry_mpi_neg (a, a);
}
else
gcry_mpi_set_ui (a, data[idx].value);
err = gcry_mpi_aprint (GCRYMPI_FMT_HEX, bufaddr, NULL, a);
if (err)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "HEX", gpg_strerror (err));
else
{
if (strcmp (buf, data[idx].a.hex))
{
fail ("error printing value %d as %s: %s\n",
data[idx].value, "HEX", "wrong result");
info ("expected: '%s'\n", data[idx].a.hex);
info (" got: '%s'\n", buf);
}
gcry_free (buf);
}
err = gcry_mpi_aprint (GCRYMPI_FMT_STD, bufaddr, &buflen, a);
if (err)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "STD", gpg_strerror (err));
else
{
if (buflen != data[idx].a.stdlen
|| memcmp (buf, data[idx].a.std, data[idx].a.stdlen))
{
fail ("error printing value %d as %s: %s\n",
data[idx].value, "STD", "wrong result");
showhex ("expected:", data[idx].a.std, data[idx].a.stdlen);
showhex (" got:", buf, buflen);
}
gcry_free (buf);
}
err = gcry_mpi_aprint (GCRYMPI_FMT_SSH, bufaddr, &buflen, a);
if (err)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "SSH", gpg_strerror (err));
else
{
if (buflen != data[idx].a.sshlen
|| memcmp (buf, data[idx].a.ssh, data[idx].a.sshlen))
{
fail ("error printing value %d as %s: %s\n",
data[idx].value, "SSH", "wrong result");
showhex ("expected:", data[idx].a.ssh, data[idx].a.sshlen);
showhex (" got:", buf, buflen);
}
gcry_free (buf);
}
err = gcry_mpi_aprint (GCRYMPI_FMT_USG, bufaddr, &buflen, a);
if (err)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "USG", gpg_strerror (err));
else
{
if (buflen != data[idx].a.usglen
|| memcmp (buf, data[idx].a.usg, data[idx].a.usglen))
{
fail ("error printing value %d as %s: %s\n",
data[idx].value, "USG", "wrong result");
showhex ("expected:", data[idx].a.usg, data[idx].a.usglen);
showhex (" got:", buf, buflen);
}
gcry_free (buf);
}
err = gcry_mpi_aprint (GCRYMPI_FMT_PGP, bufaddr, &buflen, a);
if (gcry_mpi_is_neg (a))
{
if (gpg_err_code (err) != GPG_ERR_INV_ARG)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "PGP", "Expected error not returned");
}
else if (err)
fail ("error printing value %d as %s: %s\n",
data[idx].value, "PGP", gpg_strerror (err));
else
{
if (buflen != data[idx].a.pgplen
|| memcmp (buf, data[idx].a.pgp, data[idx].a.pgplen))
{
fail ("error printing value %d as %s: %s\n",
data[idx].value, "PGP", "wrong result");
showhex ("expected:", data[idx].a.pgp, data[idx].a.pgplen);
showhex (" got:", buf, buflen);
}
gcry_free (buf);
}
}
/* Now for the other direction. */
for (idx=0; idx < DIM(data); idx++)
{
if (debug)
info ("scan test %d\n", data[idx].value);
if (data[idx].value < 0)
{
gcry_mpi_set_ui (a, -data[idx].value);
gcry_mpi_neg (a, a);
}
else
gcry_mpi_set_ui (a, data[idx].value);
err = gcry_mpi_scan (&b, GCRYMPI_FMT_HEX, data[idx].a.hex, 0, &buflen);
if (err)
fail ("error scanning value %d from %s: %s\n",
data[idx].value, "HEX", gpg_strerror (err));
else
{
if (gcry_mpi_cmp (a, b))
{
fail ("error scanning value %d from %s: %s\n",
data[idx].value, "HEX", "wrong result");
showmpi ("expected:", a);
showmpi (" got:", b);
}
gcry_mpi_release (b);
}
err = gcry_mpi_scan (&b, GCRYMPI_FMT_STD,
data[idx].a.std, data[idx].a.stdlen, &buflen);
if (err)
fail ("error scanning value %d as %s: %s\n",
data[idx].value, "STD", gpg_strerror (err));
else
{
if (gcry_mpi_cmp (a, b) || data[idx].a.stdlen != buflen)
{
fail ("error scanning value %d from %s: %s (%lu)\n",
data[idx].value, "STD", "wrong result",
(long unsigned int)buflen);
showmpi ("expected:", a);
showmpi (" got:", b);
}
gcry_mpi_release (b);
}
err = gcry_mpi_scan (&b, GCRYMPI_FMT_SSH,
data[idx].a.ssh, data[idx].a.sshlen, &buflen);
if (err)
fail ("error scanning value %d as %s: %s\n",
data[idx].value, "SSH", gpg_strerror (err));
else
{
if (gcry_mpi_cmp (a, b) || data[idx].a.sshlen != buflen)
{
fail ("error scanning value %d from %s: %s (%lu)\n",
data[idx].value, "SSH", "wrong result",
(long unsigned int)buflen);
showmpi ("expected:", a);
showmpi (" got:", b);
}
gcry_mpi_release (b);
}
err = gcry_mpi_scan (&b, GCRYMPI_FMT_USG,
data[idx].a.usg, data[idx].a.usglen, &buflen);
if (err)
fail ("error scanning value %d as %s: %s\n",
data[idx].value, "USG", gpg_strerror (err));
else
{
if (gcry_mpi_is_neg (a))
gcry_mpi_neg (b, b);
if (gcry_mpi_cmp (a, b) || data[idx].a.usglen != buflen)
{
fail ("error scanning value %d from %s: %s (%lu)\n",
data[idx].value, "USG", "wrong result",
(long unsigned int)buflen);
showmpi ("expected:", a);
showmpi (" got:", b);
}
gcry_mpi_release (b);
}
/* Negative values are not supported by PGP, thus we don't have
an samples. */
if (!gcry_mpi_is_neg (a))
{
err = gcry_mpi_scan (&b, GCRYMPI_FMT_PGP,
data[idx].a.pgp, data[idx].a.pgplen, &buflen);
if (err)
fail ("error scanning value %d as %s: %s\n",
data[idx].value, "PGP", gpg_strerror (err));
else
{
if (gcry_mpi_cmp (a, b) || data[idx].a.pgplen != buflen)
{
fail ("error scanning value %d from %s: %s (%lu)\n",
data[idx].value, "PGP", "wrong result",
(long unsigned int)buflen);
showmpi ("expected:", a);
showmpi (" got:", b);
}
gcry_mpi_release (b);
}
}
}
gcry_mpi_release (a);
}
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))
die ("version mismatch\n");
xgcry_control ((GCRYCTL_DISABLE_SECMEM, 0));
xgcry_control ((GCRYCTL_ENABLE_QUICK_RANDOM, 0));
if (debug)
xgcry_control ((GCRYCTL_SET_DEBUG_FLAGS, 1u, 0));
xgcry_control ((GCRYCTL_INITIALIZATION_FINISHED, 0));
negative_zero ();
check_formats ();
info ("All tests completed. Errors: %d\n", error_count);
return error_count ? 1 : 0;
}