MirOS Manual: BN_clear_bit(3), BN_is_bit_set(3), BN_lshift(3), BN_lshift1(3), BN_mask_bits(3), BN_rshift(3), BN_rshift1(3), BN_set_bit(3)


BN_SET_BIT(3)                OpenSSL                BN_SET_BIT(3)

NAME

     BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits,
     BN_lshift, BN_lshift1, BN_rshift, BN_rshift1 - bit opera-
     tions 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).

HISTORY

     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.

MirOS BSD #10-current      2005-02-05                           2

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