183 lines
5.9 KiB
Groff
183 lines
5.9 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BN_COPY 3"
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.TH BN_COPY 3 "2020-03-02" "3.0.0-dev" "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_copy, BN_dup, BN_with_flags \- copy 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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\& BIGNUM *BN_copy(BIGNUM *to, const BIGNUM *from);
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\&
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\& BIGNUM *BN_dup(const BIGNUM *from);
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\&
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\& void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_copy()\fR copies \fBfrom\fR to \fBto\fR. \fIBN_dup()\fR creates a new \fB\s-1BIGNUM\s0\fR
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containing the value \fBfrom\fR.
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.PP
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BN_with_flags creates a \fBtemporary\fR shallow copy of \fBb\fR in \fBdest\fR. It places
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significant restrictions on the copied data. Applications that do no adhere to
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these restrictions may encounter unexpected side effects or crashes. For that
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reason use of this function is discouraged. Any flags provided in \fBflags\fR will
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be set in \fBdest\fR in addition to any flags already set in \fBb\fR. For example this
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might commonly be used to create a temporary copy of a \s-1BIGNUM\s0 with the
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\&\fB\s-1BN_FLG_CONSTTIME\s0\fR flag set for constant time operations. The temporary copy in
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\&\fBdest\fR will share some internal state with \fBb\fR. For this reason the following
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restrictions apply to the use of \fBdest\fR:
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.IP "\(bu" 2
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\&\fBdest\fR should be a newly allocated \s-1BIGNUM\s0 obtained via a call to \fIBN_new()\fR. It
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should not have been used for other purposes or initialised in any way.
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.IP "\(bu" 2
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\&\fBdest\fR must only be used in \*(L"read-only\*(R" operations, i.e. typically those
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functions where the relevant parameter is declared \*(L"const\*(R".
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.IP "\(bu" 2
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\&\fBdest\fR must be used and freed before any further subsequent use of \fBb\fR
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_copy()\fR returns \fBto\fR on success, \s-1NULL\s0 on error. \fIBN_dup()\fR returns
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the new \fB\s-1BIGNUM\s0\fR, and \s-1NULL\s0 on error. The error codes can be obtained
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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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\&\fIERR_get_error\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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