1 .\" Automatically generated by Pod::Man 2.16 (Pod::Simple 3.05)
4 .\" ========================================================================
5 .de Sh \" Subsection heading
13 .de Sp \" Vertical space (when we can't use .PP)
17 .de Vb \" Begin verbatim text
22 .de Ve \" End verbatim text
26 .\" Set up some character translations and predefined strings. \*(-- will
27 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
28 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
29 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
30 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
31 .\" nothing in troff, for use with C<>.
33 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
37 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
38 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
51 .\" Escape single quotes in literal strings from groff's Unicode transform.
55 .\" If the F register is turned on, we'll generate index entries on stderr for
56 .\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
57 .\" entries marked with X<> in POD. Of course, you'll have to process the
58 .\" output yourself in some meaningful fashion.
61 . tm Index:\\$1\t\\n%\t"\\$2"
71 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
72 .\" Fear. Run. Save yourself. No user-serviceable parts.
73 . \" fudge factors for nroff and troff
82 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
88 . \" simple accents for nroff and troff
98 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
99 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
100 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
101 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
102 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
103 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
105 . \" troff and (daisy-wheel) nroff accents
106 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
107 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
108 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
109 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
110 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
111 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
112 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
113 .ds ae a\h'-(\w'a'u*4/10)'e
114 .ds Ae A\h'-(\w'A'u*4/10)'E
115 . \" corrections for vroff
116 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
117 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
118 . \" for low resolution devices (crt and lpr)
119 .if \n(.H>23 .if \n(.V>19 \
132 .\" ========================================================================
134 .IX Title "BN_CTX_new 3"
135 .TH BN_CTX_new 3 "2009-11-06" "0.9.8l" "OpenSSL"
136 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
137 .\" way too many mistakes in technical documents.
141 BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/bn.h>
147 \& BN_CTX *BN_CTX_new(void);
149 \& void BN_CTX_init(BN_CTX *c);
151 \& void BN_CTX_free(BN_CTX *c);
154 .IX Header "DESCRIPTION"
155 A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
156 library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
157 is rather expensive when used in conjunction with repeated subroutine
158 calls, the \fB\s-1BN_CTX\s0\fR structure is used.
160 \&\fIBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR
161 structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
162 \&\fB\s-1BN_CTX\s0\fR.
164 \&\fIBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was
165 created by \fIBN_CTX_new()\fR, also the structure itself.
166 If \fIBN_CTX_start\fR\|(3) has been used on the \fB\s-1BN_CTX\s0\fR,
167 \&\fIBN_CTX_end\fR\|(3) must be called before the \fB\s-1BN_CTX\s0\fR
168 may be freed by \fIBN_CTX_free()\fR.
170 .IX Header "RETURN VALUES"
171 \&\fIBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails,
172 it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
173 \&\fIERR_get_error\fR\|(3).
175 \&\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
177 .IX Header "SEE ALSO"
178 \&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3),
179 \&\fIBN_CTX_start\fR\|(3)
182 \&\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
183 and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.