BN_cmp(3)

     BN_cmp(3)              0.9.6h (2000-01-26)              BN_cmp(3)

     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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