HP Open Source Security for OpenVMS Volume 2: HP SSL for OpenVMS > CRYPTO Application Programming Interface (API) Reference

BN_cmp

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NAME

BN_cmp, BN_ucmp, BN_is_zero, BN_is_one, BN_is_word, BN_is_odd — BIGNUM comparison and test functions

Synopsis

#include <openssl/bn.h> 
int
BN_cmp(BIGNUM *a, BIGNUM *b); 
int BN_ucmp(BIGNUM *a, BIGNUM
*b); 
int BN_is_zero(BIGNUM *a); 
int BN_is_one(BIGNUM
*a); 
int BN_is_word(BIGNUM *a, BN_ULONG w); 
int
BN_is_odd(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_is_odd() tests if a is odd.

BN_is_zero(), BN_is_one(), BN_is_word() and BN_is_odd() are macros.

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() and BN_is_odd() return 1 if the condition is true, 0 otherwise.

SEE ALSO

bn(3)

HISTORY

BN_cmp(), BN_ucmp(), BN_is_zero(), BN_is_one() and BN_is_word() are available in all versions of SSLeay and OpenSSL. BN_is_odd() was added in SSLeay 0.8.



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