195 lines
6.1 KiB
Groff
195 lines
6.1 KiB
Groff
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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 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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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 "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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\&
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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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\&
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\& int BN_is_bit_set(const BIGNUM *a, int n);
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\&
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\& int BN_mask_bits(BIGNUM *a, int n);
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\&
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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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\&
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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). Note that \fBn\fR must be non-negative. \fIBN_lshift1()\fR shifts
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\&\fBa\fR left by one and places 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). Note that \fBn\fR must be non-negative. \fIBN_rshift1()\fR shifts
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\&\fBa\fR right by one and places 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 \fIERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3), \fIBN_num_bytes\fR\|(3), \fIBN_add\fR\|(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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