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TEST: Add a test of the new BN_signed set of functions in test/bntest.c

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Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17139)
This commit is contained in:
Richard Levitte 2021-11-25 18:00:16 +01:00
parent f5e8050fdc
commit 5288303da9
1 changed files with 132 additions and 0 deletions
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132
test/bntest.c
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@ -1834,6 +1834,137 @@ static int test_bn2padded(void)
return st;
}
static const MPITEST kSignedTests_BE[] = {
{"-1", "\xff", 1},
{"0", "", 0},
{"1", "\x01", 1},
/*
* The above cover the basics, now let's go for possible bignum
* chunk edges and other word edges (for a broad definition of
* "word", i.e. 1 byte included).
*/
/* 1 byte edge */
{"127", "\x7f", 1},
{"-127", "\x81", 1},
{"128", "\x00\x80", 2},
{"-128", "\x80", 1},
{"129", "\x00\x81", 2},
{"-129", "\xff\x7f", 2},
{"255", "\x00\xff", 2},
{"-255", "\xff\x01", 2},
{"256", "\x01\x00", 2},
{"-256", "\xff\x00", 2},
/* 2 byte edge */
{"32767", "\x7f\xff", 2},
{"-32767", "\x80\x01", 2},
{"32768", "\x00\x80\x00", 3},
{"-32768", "\x80\x00", 2},
{"32769", "\x00\x80\x01", 3},
{"-32769", "\xff\x7f\xff", 3},
{"65535", "\x00\xff\xff", 3},
{"-65535", "\xff\x00\x01", 3},
{"65536", "\x01\x00\x00", 3},
{"-65536", "\xff\x00\x00", 3},
/* 4 byte edge */
{"2147483647", "\x7f\xff\xff\xff", 4},
{"-2147483647", "\x80\x00\x00\x01", 4},
{"2147483648", "\x00\x80\x00\x00\x00", 5},
{"-2147483648", "\x80\x00\x00\x00", 4},
{"2147483649", "\x00\x80\x00\x00\x01", 5},
{"-2147483649", "\xff\x7f\xff\xff\xff", 5},
{"4294967295", "\x00\xff\xff\xff\xff", 5},
{"-4294967295", "\xff\x00\x00\x00\x01", 5},
{"4294967296", "\x01\x00\x00\x00\x00", 5},
{"-4294967296", "\xff\x00\x00\x00\x00", 5},
/* 8 byte edge */
{"9223372036854775807", "\x7f\xff\xff\xff\xff\xff\xff\xff", 8},
{"-9223372036854775807", "\x80\x00\x00\x00\x00\x00\x00\x01", 8},
{"9223372036854775808", "\x00\x80\x00\x00\x00\x00\x00\x00\x00", 9},
{"-9223372036854775808", "\x80\x00\x00\x00\x00\x00\x00\x00", 8},
{"9223372036854775809", "\x00\x80\x00\x00\x00\x00\x00\x00\x01", 9},
{"-9223372036854775809", "\xff\x7f\xff\xff\xff\xff\xff\xff\xff", 9},
{"18446744073709551615", "\x00\xff\xff\xff\xff\xff\xff\xff\xff", 9},
{"-18446744073709551615", "\xff\x00\x00\x00\x00\x00\x00\x00\x01", 9},
{"18446744073709551616", "\x01\x00\x00\x00\x00\x00\x00\x00\x00", 9},
{"-18446744073709551616", "\xff\x00\x00\x00\x00\x00\x00\x00\x00", 9},
};
static int copy_reversed(uint8_t *dst, uint8_t *src, size_t len)
{
for (dst += len - 1; len > 0; src++, dst--, len--)
*dst = *src;
return 1;
}
static int test_bn2signed(int i)
{
uint8_t scratch[10], reversed[10];
const MPITEST *test = &kSignedTests_BE[i];
BIGNUM *bn = NULL, *bn2 = NULL;
int st = 0;
if (!TEST_ptr(bn = BN_new())
|| !TEST_true(BN_asc2bn(&bn, test->base10)))
goto err;
/*
* Check BN_signed_bn2bin() / BN_signed_bin2bn()
* The interesting stuff happens in the last bytes of the buffers,
* the beginning is just padding (i.e. sign extension).
*/
i = sizeof(scratch) - test->mpi_len;
if (!TEST_int_eq(BN_signed_bn2bin(bn, scratch, sizeof(scratch)),
sizeof(scratch))
|| !TEST_true(copy_reversed(reversed, scratch, sizeof(scratch)))
|| !TEST_mem_eq(test->mpi, test->mpi_len, scratch + i, test->mpi_len))
goto err;
if (!TEST_ptr(bn2 = BN_signed_bin2bn(scratch, sizeof(scratch), NULL))
|| !TEST_BN_eq(bn, bn2))
goto err;
BN_free(bn2);
bn2 = NULL;
/* Check that a parse of the reversed buffer works too */
if (!TEST_ptr(bn2 = BN_signed_lebin2bn(reversed, sizeof(reversed), NULL))
|| !TEST_BN_eq(bn, bn2))
goto err;
BN_free(bn2);
bn2 = NULL;
/*
* Check BN_signed_bn2lebin() / BN_signed_lebin2bn()
* The interesting stuff happens in the first bytes of the buffers,
* the end is just padding (i.e. sign extension).
*/
i = sizeof(reversed) - test->mpi_len;
if (!TEST_int_eq(BN_signed_bn2lebin(bn, scratch, sizeof(scratch)),
sizeof(scratch))
|| !TEST_true(copy_reversed(reversed, scratch, sizeof(scratch)))
|| !TEST_mem_eq(test->mpi, test->mpi_len, reversed + i, test->mpi_len))
goto err;
if (!TEST_ptr(bn2 = BN_signed_lebin2bn(scratch, sizeof(scratch), NULL))
|| !TEST_BN_eq(bn, bn2))
goto err;
BN_free(bn2);
bn2 = NULL;
/* Check that a parse of the reversed buffer works too */
if (!TEST_ptr(bn2 = BN_signed_bin2bn(reversed, sizeof(reversed), NULL))
|| !TEST_BN_eq(bn, bn2))
goto err;
st = 1;
err:
BN_free(bn2);
BN_free(bn);
return st;
}
static int test_dec2bn(void)
{
BIGNUM *bn = NULL;
@ -2998,6 +3129,7 @@ int setup_tests(void)
ADD_TEST(test_hex2bn);
ADD_TEST(test_asc2bn);
ADD_ALL_TESTS(test_mpi, (int)OSSL_NELEM(kMPITests));
ADD_ALL_TESTS(test_bn2signed, (int)OSSL_NELEM(kSignedTests_BE));
ADD_TEST(test_negzero);
ADD_TEST(test_badmod);
ADD_TEST(test_expmodzero);