f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
210 lines
6.1 KiB
Groff
210 lines
6.1 KiB
Groff
.\" $NetBSD: BN_set_bit.3,v 1.13 2003/07/24 14:16:38 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "BN_set_bit 3"
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.TH BN_set_bit 3 "0.9.7b" "2000-02-24" "OpenSSL"
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.UC
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.SH "NAME"
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BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift,
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BN_lshift1, BN_rshift, BN_rshift1 \- bit operations on BIGNUMs
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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.Ve
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.Vb 2
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\& int BN_set_bit(BIGNUM *a, int n);
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\& int BN_clear_bit(BIGNUM *a, int n);
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.Ve
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.Vb 1
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\& int BN_is_bit_set(const BIGNUM *a, int n);
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.Ve
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.Vb 1
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\& int BN_mask_bits(BIGNUM *a, int n);
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.Ve
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.Vb 2
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\& int BN_lshift(BIGNUM *r, const BIGNUM *a, int n);
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\& int BN_lshift1(BIGNUM *r, BIGNUM *a);
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.Ve
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.Vb 2
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\& int BN_rshift(BIGNUM *r, BIGNUM *a, int n);
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\& int BN_rshift1(BIGNUM *r, BIGNUM *a);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_set_bit()\fR sets bit \fBn\fR in \fBa\fR to 1 (\f(CW\*(C`a|=(1<<n)\*(C'\fR). The
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number is expanded if necessary.
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.PP
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\&\fIBN_clear_bit()\fR sets bit \fBn\fR in \fBa\fR to 0 (\f(CW\*(C`a&=~(1<<n)\*(C'\fR). An
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error occurs if \fBa\fR is shorter than \fBn\fR bits.
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.PP
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\&\fIBN_is_bit_set()\fR tests if bit \fBn\fR in \fBa\fR is set.
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.PP
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\&\fIBN_mask_bits()\fR truncates \fBa\fR to an \fBn\fR bit number
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(\f(CW\*(C`a&=~((~0)>>n)\*(C'\fR). An error occurs if \fBa\fR already is
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shorter than \fBn\fR bits.
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.PP
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\&\fIBN_lshift()\fR shifts \fBa\fR left by \fBn\fR bits and places the result in
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\&\fBr\fR (\f(CW\*(C`r=a*2^n\*(C'\fR). \fIBN_lshift1()\fR shifts \fBa\fR left by one and places
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the result in \fBr\fR (\f(CW\*(C`r=2*a\*(C'\fR).
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.PP
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\&\fIBN_rshift()\fR shifts \fBa\fR right by \fBn\fR bits and places the result in
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\&\fBr\fR (\f(CW\*(C`r=a/2^n\*(C'\fR). \fIBN_rshift1()\fR shifts \fBa\fR right by one and places
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the result in \fBr\fR (\f(CW\*(C`r=a/2\*(C'\fR).
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.PP
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For the shift functions, \fBr\fR and \fBa\fR may be the same variable.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_is_bit_set()\fR returns 1 if the bit is set, 0 otherwise.
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.PP
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All other functions return 1 for success, 0 on error. The error codes
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can be obtained by ERR_get_error(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_bn(3), BN_num_bytes(3), BN_add(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_set_bit()\fR, \fIBN_clear_bit()\fR, \fIBN_is_bit_set()\fR, \fIBN_mask_bits()\fR,
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\&\fIBN_lshift()\fR, \fIBN_lshift1()\fR, \fIBN_rshift()\fR, and \fIBN_rshift1()\fR are available
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in all versions of SSLeay and OpenSSL.
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