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bignum: introduce write uint32/uint64

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This commit is contained in:
Alex Beregszaszi 2016-08-26 12:41:54 +01:00
parent 7956c2f2f1
commit 8581614d66
2 changed files with 58 additions and 0 deletions
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16
bignum.h
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@ -58,6 +58,22 @@ void bn_read_uint32(uint32_t in_number, bignum256 *out_number);
void bn_read_uint64(uint64_t in_number, bignum256 *out_number);
static inline uint32_t bn_write_uint32(const bignum256 *in_number)
{
return in_number->val[0] | (in_number->val[1] << 30);
}
static inline uint64_t bn_write_uint64(const bignum256 *in_number)
{
uint64_t tmp;
tmp = in_number->val[2];
tmp <<= 30;
tmp |= in_number->val[1];
tmp <<= 30;
tmp |= in_number->val[0];
return tmp;
}
// copies number a to b
static inline void bn_copy(const bignum256 *a, bignum256 *b) {
*b = *a;

42
tests.c
View File

@ -233,6 +233,46 @@ START_TEST(test_bignum_read_uint64)
}
END_TEST
START_TEST(test_bignum_write_uint32)
{
bignum256 a;
// lowest 30 bits set
bn_read_be(fromhex("000000000000000000000000000000000000000000000000000000003fffffff"), &a);
ck_assert_int_eq(bn_write_uint32(&a), 0x3fffffff);
// bit 31 set
bn_read_be(fromhex("0000000000000000000000000000000000000000000000000000000040000000"), &a);
ck_assert_int_eq(bn_write_uint32(&a), 0x40000000);
}
END_TEST
START_TEST(test_bignum_write_uint64)
{
bignum256 a;
// lowest 30 bits set
bn_read_be(fromhex("000000000000000000000000000000000000000000000000000000003fffffff"), &a);
ck_assert_int_eq(bn_write_uint64(&a), 0x3fffffff);
// bit 31 set
bn_read_be(fromhex("0000000000000000000000000000000000000000000000000000000040000000"), &a);
ck_assert_int_eq(bn_write_uint64(&a), 0x40000000);
// bit 33 set
bn_read_be(fromhex("0000000000000000000000000000000000000000000000000000000100000000"), &a);
ck_assert_int_eq(bn_write_uint64(&a), 0x100000000LL);
// bit 61 set
bn_read_be(fromhex("0000000000000000000000000000000000000000000000002000000000000000"), &a);
ck_assert_int_eq(bn_write_uint64(&a), 0x2000000000000000LL);
// all 64 bits set
bn_read_be(fromhex("000000000000000000000000000000000000000000000000ffffffffffffffff"), &a);
ck_assert_int_eq(bn_write_uint64(&a), 0xffffffffffffffffLL);
}
END_TEST
START_TEST(test_bignum_copy)
{
bignum256 a;
@ -2547,6 +2587,8 @@ Suite *test_suite(void)
tcase_add_test(tc, test_bignum_write_le);
tcase_add_test(tc, test_bignum_read_uint32);
tcase_add_test(tc, test_bignum_read_uint64);
tcase_add_test(tc, test_bignum_write_uint32);
tcase_add_test(tc, test_bignum_write_uint64);
tcase_add_test(tc, test_bignum_copy);
tcase_add_test(tc, test_bignum_is_even);
tcase_add_test(tc, test_bignum_is_odd);