250 lines
5.8 KiB
Groff
250 lines
5.8 KiB
Groff
.rn '' }`
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" X<> Xref (embedded
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.\}
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.TH BN_CTX_new 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/bn.h>
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.Ve
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.Vb 1
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\& BN_CTX *BN_CTX_new(void);
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.Ve
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.Vb 1
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\& void BN_CTX_init(BN_CTX *c);
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.Ve
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.Vb 1
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\& void BN_CTX_free(BN_CTX *c);
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.Ve
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.SH "DESCRIPTION"
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A \fBBN_CTX\fR is a structure that holds \fBBIGNUM\fR temporary variables used by
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library functions. Since dynamic memory allocation to create \fBBIGNUM\fRs
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is rather expensive when used in conjunction with repeated subroutine
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calls, the \fBBN_CTX\fR structure is used.
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.PP
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\fIBN_CTX_new()\fR allocates and initializes a \fBBN_CTX\fR
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structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
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\fBBN_CTX\fR.
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.PP
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\fIBN_CTX_free()\fR frees the components of the \fBBN_CTX\fR, and if it was
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created by \fIBN_CTX_new()\fR, also the structure itself.
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If the \fIBN_CTX_start(3)|BN_CTX_start(3)\fR manpage has been used on the \fBBN_CTX\fR,
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the \fIBN_CTX_end(3)|BN_CTX_end(3)\fR manpage must be called before the \fBBN_CTX\fR
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may be freed by \fIBN_CTX_free()\fR.
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.SH "RETURN VALUES"
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\fIBN_CTX_new()\fR returns a pointer to the \fBBN_CTX\fR. If the allocation fails,
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it returns \fBNULL\fR and sets an error code that can be obtained by
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the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.PP
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\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
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.SH "SEE ALSO"
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the \fIbn(3)|bn(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage, the \fIBN_add(3)|BN_add(3)\fR manpage,
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the \fIBN_CTX_start(3)|BN_CTX_start(3)\fR manpage
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.SH "HISTORY"
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\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
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and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.
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.rn }` ''
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.IX Title "BN_CTX_new 3"
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.IX Name "BN_CTX_new, BN_CTX_init, BN_CTX_free - allocate and free BN_CTX structures"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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