NAME
BN_cmp, BN_ucmp,
BN_is_zero, BN_is_one,
BN_is_word, BN_abs_is_word,
BN_is_odd —
BIGNUM comparison and test
functions
SYNOPSIS
#include
<openssl/bn.h>
int
BN_cmp(const BIGNUM *a,
const BIGNUM *b);
int
BN_ucmp(const BIGNUM *a,
const BIGNUM *b);
int
BN_is_zero(const BIGNUM *a);
int
BN_is_one(const BIGNUM *a);
int
BN_is_word(const BIGNUM *a,
const BN_ULONG w);
int
BN_abs_is_word(const BIGNUM *a,
const BN_ULONG w);
int
BN_is_odd(const BIGNUM *a);
DESCRIPTION
BN_cmp()
compares the numbers a and b.
BN_ucmp()
compares their absolute values.
BN_is_zero(),
BN_is_one()
and
BN_is_word()
test if a equals 0, 1, or w
respectively.
BN_abs_is_word()
tests if the absolute value of a equals
w.
BN_is_odd()
tests if a is odd.
BN_ULONG is a macro that expands to
unsigned long (= uint64_t) on
_LP64 platforms and unsigned
int (= uint32_t) elsewhere.
RETURN VALUES
BN_cmp() returns -1 if
a<b, 0 if
a==b, and 1 if
a>b.
BN_ucmp() is the same using the absolute values of
a and b.
BN_is_zero(),
BN_is_one(), BN_is_word(),
BN_abs_is_word(), and
BN_is_odd() return 1 if the condition is true, 0
otherwise.
SEE ALSO
HISTORY
BN_cmp(),
BN_ucmp(), BN_is_zero(),
BN_is_one(), and
BN_is_word() first appeared in SSLeay 0.5.1.
BN_is_odd() first appeared in SSLeay 0.8.0. These
functions have been available since OpenBSD 2.4.
BN_abs_is_word() first appeared in OpenSSL
0.9.7 and has been available since OpenBSD 3.2.