BNsetbit(3) OpenSSL BNsetbit(3)

NAME
       BNsetbit, BNclearbit, BNisbitset, BNmaskbits, BNlshift,
       BNlshift1, BNrshift, BNrshift1 - bit operations on BIGNUMs

SYNOPSIS
        #include 

        int BNsetbit(BIGNUM *a, int n);
        int BNclearbit(BIGNUM *a, int n);

        int BNisbitset(const BIGNUM *a, int n);

        int BNmaskbits(BIGNUM *a, int n);

        int BNlshift(BIGNUM *r, const BIGNUM *a, int n);
        int BNlshift1(BIGNUM *r, BIGNUM *a);

        int BNrshift(BIGNUM *r, BIGNUM *a, int n);
        int BNrshift1(BIGNUM *r, BIGNUM *a);

DESCRIPTION
       BNsetbit() sets bit nn in aa to 1 ("a|=(1<>n)").  An
       error occurs if aa already is shorter than nn bits.

       BNlshift() shifts aa left by nn bits and places the result in rr
       ("r=a*2^n"). BNlshift1() shifts aa left by one and places the result in
       rr ("r=2*a").

       BNrshift() shifts aa right by nn bits and places the result in rr
       ("r=a/2^n"). BNrshift1() shifts aa right by one and places the result
       in rr ("r=a/2").

       For the shift functions, rr and aa may be the same variable.

RETURN VALUES
       BNisbitset() returns 1 if the bit is set, 0 otherwise.

       All other functions return 1 for success, 0 on error. The error codes
       can be obtained by ERRgeterror(3).

SEE ALSO
       bn(3), BNnumbytes(3), BNadd(3)

HISTORY       BNsetbit(), BNclearbit(), BNisbitset(), BNmaskbits(),
       BNlshift(), BNlshift1(), BNrshift(), and BNrshift1() are available
       in all versions of SSLeay and OpenSSL.



0.9.7l                            2000-02-24                     BNsetbit(3)