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bignum: introduce is_even/is_odd

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This commit is contained in:
Alex Beregszaszi 2016-08-25 23:55:40 +01:00
parent dd25a2ee5a
commit 339d2f44a9
2 changed files with 41 additions and 0 deletions
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9
bignum.h
View File

@ -1,6 +1,7 @@
/**
* Copyright (c) 2013-2014 Tomas Dzetkulic
* Copyright (c) 2013-2014 Pavol Rusnak
* Copyright (c) 2016 Alex Beregszaszi
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
@ -59,6 +60,14 @@ void bn_zero(bignum256 *a);
int bn_is_zero(const bignum256 *a);
static inline int bn_is_even(const bignum256 *a) {
return (a->val[0] & 1) == 0;
}
static inline int bn_is_odd(const bignum256 *a) {
return (a->val[0] & 1) == 1;
}
int bn_is_less(const bignum256 *a, const bignum256 *b);
int bn_is_equal(const bignum256 *a, const bignum256 *b);

32
tests.c
View File

@ -165,6 +165,36 @@ START_TEST(test_bignum_copy)
}
END_TEST
START_TEST(test_bignum_is_even)
{
bignum256 a;
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd5"), &a);
ck_assert_int_eq(bn_is_even(&a), 0);
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd2"), &a);
ck_assert_int_eq(bn_is_even(&a), 1);
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd0"), &a);
ck_assert_int_eq(bn_is_even(&a), 1);
}
END_TEST
START_TEST(test_bignum_is_odd)
{
bignum256 a;
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd5"), &a);
ck_assert_int_eq(bn_is_odd(&a), 1);
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd2"), &a);
ck_assert_int_eq(bn_is_odd(&a), 0);
bn_read_be(fromhex("c55ece858b0ddd5263f96810fe14437cd3b5e1fbd7c6a2ec1e031f05e86d8bd0"), &a);
ck_assert_int_eq(bn_is_odd(&a), 0);
}
END_TEST
// from https://github.com/bitcoin/bitcoin/blob/master/src/test/data/base58_keys_valid.json
START_TEST(test_base58)
{
@ -2416,6 +2446,8 @@ Suite *test_suite(void)
tcase_add_test(tc, test_bignum_read_le);
tcase_add_test(tc, test_bignum_write_le);
tcase_add_test(tc, test_bignum_copy);
tcase_add_test(tc, test_bignum_is_even);
tcase_add_test(tc, test_bignum_is_odd);
suite_add_tcase(s, tc);
tc = tcase_create("base58");