BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits,
       BN_lshift, BN_lshift1, BN_rshift, BN_rshift1 - bit
       operations on BIGNUMs


SYNOPSIS

        #include <openssl/bn.h>

        int BN_set_bit(BIGNUM *a, int n);
        int BN_clear_bit(BIGNUM *a, int n);

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

        int BN_mask_bits(BIGNUM *a, int n);

        int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
        int BN_lshift1(BIGNUM *r, BIGNUM *a);

        int BN_rshift(BIGNUM *r, BIGNUM *a, int n);
        int BN_rshift1(BIGNUM *r, BIGNUM *a);


DESCRIPTION

       BN_set_bit() sets bit n in a to 1 (a|=(1<<n)). The number
       is expanded if necessary.

       BN_clear_bit() sets bit n in a to 0 (a&=~(1<<n)). An error
       occurs if a is shorter than n bits.

       BN_is_bit_set() tests if bit n in a is set.

       BN_mask_bits() truncates a to an n bit number
       (a&=~((~0)>>n)).  An error occurs if a already is shorter
       than n bits.

       BN_lshift() shifts a left by n bits and places the result
       in r (r=a*2^n). BN_lshift1() shifts a left by one and
       places the result in r (r=2*a).

       BN_rshift() shifts a right by n bits and places the result
       in r (r=a/2^n). BN_rshift1() shifts a right by one and
       places the result in r (r=a/2).

       For the shift functions, r and a may be the same variable.


RETURN VALUES

       BN_is_bit_set() 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 ERR_get_error(3).


SEE ALSO

       bn(3), BN_num_bytes(3), BN_add(3)

       BN_set_bit(), BN_clear_bit(), BN_is_bit_set(),
       BN_mask_bits(), BN_lshift(), BN_lshift1(), BN_rshift(),
       and BN_rshift1() are available in all versions of SSLeay
       and OpenSSL.


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