248 lines
5.7 KiB
Groff
248 lines
5.7 KiB
Groff
.rn '' }`
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.de Sh
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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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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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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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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.\}
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.TH BN_CTX_start 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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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_start, BN_CTX_get, BN_CTX_end \- use temporary BIGNUM variables
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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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\& void BN_CTX_start(BN_CTX *ctx);
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.Ve
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.Vb 1
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\& BIGNUM *BN_CTX_get(BN_CTX *ctx);
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.Ve
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.Vb 1
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\& void BN_CTX_end(BN_CTX *ctx);
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.Ve
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.SH "DESCRIPTION"
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These functions are used to obtain temporary \fBBIGNUM\fR variables from
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a \fBBN_CTX\fR in order to save the overhead of repeatedly creating and
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freeing \fBBIGNUM\fRs in functions that are called from inside a loop.
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.PP
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A function must call \fIBN_CTX_start()\fR first. Then, \fIBN_CTX_get()\fR may be
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called repeatedly to obtain temporary \fBBIGNUM\fRs. All \fIBN_CTX_get()\fR
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calls must be made before calling any other functions that use the
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\fBctx\fR as an argument.
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.PP
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Finally, \fIBN_CTX_end()\fR must be called before returning from the function.
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When \fIBN_CTX_end()\fR is called, the \fBBIGNUM\fR pointers obtained from
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\fIBN_CTX_get()\fR become invalid.
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.SH "RETURN VALUES"
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\fIBN_CTX_start()\fR and \fIBN_CTX_end()\fR return no values.
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.PP
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\fIBN_CTX_get()\fR returns a pointer to the \fBBIGNUM\fR, or \fBNULL\fR on error.
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Once \fIBN_CTX_get()\fR has failed, the subsequent calls will return \fBNULL\fR
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as well, so it is sufficient to check the return value of the last
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\fIBN_CTX_get()\fR call. In case of an error, an error code is set, which
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can be obtained by the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage.
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.SH "SEE ALSO"
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the \fIBN_CTX_new(3)|BN_CTX_new(3)\fR manpage
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.SH "HISTORY"
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\fIBN_CTX_start()\fR, \fIBN_CTX_get()\fR and \fIBN_CTX_end()\fR were added in OpenSSL 0.9.5.
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.rn }` ''
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.IX Title "BN_CTX_start 3"
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.IX Name "BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables"
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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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