1.\" Automatically generated by Pod::Man version 1.15
| 1.\" Automatically generated by Pod::Man version 1.15
|
2.\" Mon Jan 13 19:27:14 2003
| 2.\" Mon Feb 3 10:01:42 2003
|
3.\"
4.\" Standard preamble:
5.\" ======================================================================
6.de Sh \" Subsection heading
7.br
8.if t .Sp
9.ne 5
10.PP
11\fB\\$1\fR
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13..
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15.if t .sp .5v
16.if n .sp
17..
18.de Ip \" List item
19.br
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21.el .ne 3
22.IP "\\$1" \\$2
23..
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25.ft CW
26.nf
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29.de Ve \" End verbatim text
30.ft R
31
32.fi
33..
34.\" Set up some character translations and predefined strings. \*(-- will
35.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
36.\" double quote, and \*(R" will give a right double quote. | will give a
37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
38.\" to do unbreakable dashes and therefore won't be available. \*(C` and
39.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<>
40.tr \(*W-|\(bv\*(Tr
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58.\"
59.\" If the F register is turned on, we'll generate index entries on stderr
60.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
61.\" index entries marked with X<> in POD. Of course, you'll have to process
62.\" the output yourself in some meaningful fashion.
63.if \nF \{\
64. de IX
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138.\" ======================================================================
139.\"
140.IX Title "BN_CTX_start 3"
| 3.\"
4.\" Standard preamble:
5.\" ======================================================================
6.de Sh \" Subsection heading
7.br
8.if t .Sp
9.ne 5
10.PP
11\fB\\$1\fR
12.PP
13..
14.de Sp \" Vertical space (when we can't use .PP)
15.if t .sp .5v
16.if n .sp
17..
18.de Ip \" List item
19.br
20.ie \\n(.$>=3 .ne \\$3
21.el .ne 3
22.IP "\\$1" \\$2
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24.de Vb \" Begin verbatim text
25.ft CW
26.nf
27.ne \\$1
28..
29.de Ve \" End verbatim text
30.ft R
31
32.fi
33..
34.\" Set up some character translations and predefined strings. \*(-- will
35.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
36.\" double quote, and \*(R" will give a right double quote. | will give a
37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
38.\" to do unbreakable dashes and therefore won't be available. \*(C` and
39.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<>
40.tr \(*W-|\(bv\*(Tr
41.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
42.ie n \{\
43. ds -- \(*W-
44. ds PI pi
45. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
46. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
47. ds L" ""
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50. ds C' ""
51'br\}
52.el\{\
53. ds -- \|\(em\|
54. ds PI \(*p
55. ds L" ``
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57'br\}
58.\"
59.\" If the F register is turned on, we'll generate index entries on stderr
60.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
61.\" index entries marked with X<> in POD. Of course, you'll have to process
62.\" the output yourself in some meaningful fashion.
63.if \nF \{\
64. de IX
65. tm Index:\\$1\t\\n%\t"\\$2"
66..
67. nr % 0
68. rr F
69.\}
70.\"
71.\" For nroff, turn off justification. Always turn off hyphenation; it
72.\" makes way too many mistakes in technical documents.
73.hy 0
74.if n .na
75.\"
76.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
77.\" Fear. Run. Save yourself. No user-serviceable parts.
78.bd B 3
79. \" fudge factors for nroff and troff
80.if n \{\
81. ds #H 0
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83. ds #F .3m
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90. ds #F 0
91. ds #[ \&
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110.\}
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138.\" ======================================================================
139.\"
140.IX Title "BN_CTX_start 3"
|
141.TH BN_CTX_start 3 "0.9.7" "2003-01-13" "OpenSSL"
| 141.TH BN_CTX_start 3 "0.9.7" "2003-02-03" "OpenSSL"
|
142.UC
143.SH "NAME"
144BN_CTX_start, BN_CTX_get, BN_CTX_end \- use temporary \s-1BIGNUM\s0 variables
145.SH "SYNOPSIS"
146.IX Header "SYNOPSIS"
147.Vb 1
148\& #include <openssl/bn.h>
149.Ve
150.Vb 1
151\& void BN_CTX_start(BN_CTX *ctx);
152.Ve
153.Vb 1
154\& BIGNUM *BN_CTX_get(BN_CTX *ctx);
155.Ve
156.Vb 1
157\& void BN_CTX_end(BN_CTX *ctx);
158.Ve
159.SH "DESCRIPTION"
160.IX Header "DESCRIPTION"
161These functions are used to obtain temporary \fB\s-1BIGNUM\s0\fR variables from
162a \fB\s-1BN_CTX\s0\fR (which can been created by using BN_CTX_new(3))
163in order to save the overhead of repeatedly creating and
164freeing \fB\s-1BIGNUM\s0\fRs in functions that are called from inside a loop.
165.PP
166A function must call \fIBN_CTX_start()\fR first. Then, \fIBN_CTX_get()\fR may be
167called repeatedly to obtain temporary \fB\s-1BIGNUM\s0\fRs. All \fIBN_CTX_get()\fR
168calls must be made before calling any other functions that use the
169\&\fBctx\fR as an argument.
170.PP
171Finally, \fIBN_CTX_end()\fR must be called before returning from the function.
172When \fIBN_CTX_end()\fR is called, the \fB\s-1BIGNUM\s0\fR pointers obtained from
173\&\fIBN_CTX_get()\fR become invalid.
174.SH "RETURN VALUES"
175.IX Header "RETURN VALUES"
176\&\fIBN_CTX_start()\fR and \fIBN_CTX_end()\fR return no values.
177.PP
178\&\fIBN_CTX_get()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR, or \fB\s-1NULL\s0\fR on error.
179Once \fIBN_CTX_get()\fR has failed, the subsequent calls will return \fB\s-1NULL\s0\fR
180as well, so it is sufficient to check the return value of the last
181\&\fIBN_CTX_get()\fR call. In case of an error, an error code is set, which
182can be obtained by ERR_get_error(3).
183.SH "SEE ALSO"
184.IX Header "SEE ALSO"
185BN_CTX_new(3)
186.SH "HISTORY"
187.IX Header "HISTORY"
188\&\fIBN_CTX_start()\fR, \fIBN_CTX_get()\fR and \fIBN_CTX_end()\fR were added in OpenSSL 0.9.5.
| 142.UC
143.SH "NAME"
144BN_CTX_start, BN_CTX_get, BN_CTX_end \- use temporary \s-1BIGNUM\s0 variables
145.SH "SYNOPSIS"
146.IX Header "SYNOPSIS"
147.Vb 1
148\& #include <openssl/bn.h>
149.Ve
150.Vb 1
151\& void BN_CTX_start(BN_CTX *ctx);
152.Ve
153.Vb 1
154\& BIGNUM *BN_CTX_get(BN_CTX *ctx);
155.Ve
156.Vb 1
157\& void BN_CTX_end(BN_CTX *ctx);
158.Ve
159.SH "DESCRIPTION"
160.IX Header "DESCRIPTION"
161These functions are used to obtain temporary \fB\s-1BIGNUM\s0\fR variables from
162a \fB\s-1BN_CTX\s0\fR (which can been created by using BN_CTX_new(3))
163in order to save the overhead of repeatedly creating and
164freeing \fB\s-1BIGNUM\s0\fRs in functions that are called from inside a loop.
165.PP
166A function must call \fIBN_CTX_start()\fR first. Then, \fIBN_CTX_get()\fR may be
167called repeatedly to obtain temporary \fB\s-1BIGNUM\s0\fRs. All \fIBN_CTX_get()\fR
168calls must be made before calling any other functions that use the
169\&\fBctx\fR as an argument.
170.PP
171Finally, \fIBN_CTX_end()\fR must be called before returning from the function.
172When \fIBN_CTX_end()\fR is called, the \fB\s-1BIGNUM\s0\fR pointers obtained from
173\&\fIBN_CTX_get()\fR become invalid.
174.SH "RETURN VALUES"
175.IX Header "RETURN VALUES"
176\&\fIBN_CTX_start()\fR and \fIBN_CTX_end()\fR return no values.
177.PP
178\&\fIBN_CTX_get()\fR returns a pointer to the \fB\s-1BIGNUM\s0\fR, or \fB\s-1NULL\s0\fR on error.
179Once \fIBN_CTX_get()\fR has failed, the subsequent calls will return \fB\s-1NULL\s0\fR
180as well, so it is sufficient to check the return value of the last
181\&\fIBN_CTX_get()\fR call. In case of an error, an error code is set, which
182can be obtained by ERR_get_error(3).
183.SH "SEE ALSO"
184.IX Header "SEE ALSO"
185BN_CTX_new(3)
186.SH "HISTORY"
187.IX Header "HISTORY"
188\&\fIBN_CTX_start()\fR, \fIBN_CTX_get()\fR and \fIBN_CTX_end()\fR were added in OpenSSL 0.9.5.
|