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BN_set_bit.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_set_bit()\fR sets bit \fBn\fR in \fBa\fR to 1 (\f(CW\*(C`a|=(1<<n)\*(C'\fR). The number is expanded if necessary. .PP \&\fBBN_clear_bit()\fR sets bit \fBn\fR in \fBa\fR to 0 (\f(CW\*(C`a&=~(1<<n)\*(C'\fR). An error occurs if \fBa\fR is shorter than \fBn\fR bits. .PP \&\fBBN_is_bit_set()\fR tests if bit \fBn\fR in \fBa\fR is set. .PP \&\fBBN_mask_bits()\fR truncates \fBa\fR to an \fBn\fR bit number (\f(CW\*(C`a&=~((~0)<<n)\*(C'\fR). An error occurs if \fBa\fR already is shorter than \fBn\fR bits. .PP \&\fBBN_lshift()\fR shifts \fBa\fR left by \fBn\fR bits and places the result in \&\fBr\fR (\f(CW\*(C`r=a*2^n\*(C'\fR). Note that \fBn\fR must be nonnegative. \fBBN_lshift1()\fR shifts \&\fBa\fR left by one and places the result in \fBr\fR (\f(CW\*(C`r=2*a\*(C'\fR). .PP \&\fBBN_rshift()\fR shifts \fBa\fR right by \fBn\fR bits and places the result in \&\fBr\fR (\f(CW\*(C`r=a/2^n\*(C'\fR). Note that \fBn\fR must be nonnegative. \fBBN_rshift1()\fR shifts \&\fBa\fR right by one and places the result in \fBr\fR (\f(CW\*(C`r=a/2\*(C'\fR). .PP For the shift functions, \fBr\fR and \fBa\fR may be the same variable. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_is_bit_set()\fR returns 1 if the bit is set, 0 otherwise. .PP All other functions return 1 for success, 0 on error. The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBBN_num_bytes\fR\|(3), \fBBN_add\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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