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[dragonfly.git] / secure / lib / libcrypto / man / BN_zero.3
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2''' $RCSfile$$Revision$$Date$
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34'''
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36''' Set up \*(-- to give an unbreakable dash;
37''' string Tr holds user defined translation string.
38''' Bell System Logo is used as a dummy character.
39'''
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984263bc 41.ie n \{\
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42.ds -- \(*W-
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45.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
46.ds L" ""
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48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
51''' double-quote interpretation
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64.ds -- \(em\|
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
84.\" Sh Subsection
85.\" Ip Item
86.\" X<> Xref (embedded
87.\" Of course, you have to process the output yourself
88.\" in some meaninful fashion.
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984263bc 92..
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96.TH BN_zero 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
984263bc 99.if n .na
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109..
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
74dab6c2 191BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word \- BIGNUM assignment
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192operations
193.SH "SYNOPSIS"
74dab6c2 194.PP
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195.Vb 1
196\& #include <openssl/bn.h>
197.Ve
198.Vb 2
199\& int BN_zero(BIGNUM *a);
200\& int BN_one(BIGNUM *a);
201.Ve
202.Vb 1
203\& const BIGNUM *BN_value_one(void);
204.Ve
205.Vb 2
206\& int BN_set_word(BIGNUM *a, unsigned long w);
207\& unsigned long BN_get_word(BIGNUM *a);
208.Ve
209.SH "DESCRIPTION"
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210\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR set \fBa\fR to the values 0, 1 and
211\fBw\fR respectively. \fIBN_zero()\fR and \fIBN_one()\fR are macros.
984263bc 212.PP
74dab6c2 213\fIBN_value_one()\fR returns a \fBBIGNUM\fR constant of value 1. This constant
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214is useful for use in comparisons and assignment.
215.PP
74dab6c2 216\fIBN_get_word()\fR returns \fBa\fR, if it can be represented as an unsigned
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217long.
218.SH "RETURN VALUES"
74dab6c2 219\fIBN_get_word()\fR returns the value \fBa\fR, and 0xffffffffL if \fBa\fR cannot
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220be represented as an unsigned long.
221.PP
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222\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR return 1 on success, 0 otherwise.
223\fIBN_value_one()\fR returns the constant.
984263bc 224.SH "BUGS"
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225Someone might change the constant.
226.PP
74dab6c2 227If a \fBBIGNUM\fR is equal to 0xffffffffL it can be represented as an
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228unsigned long but this value is also returned on error.
229.SH "SEE ALSO"
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230bn(3), BN_bn2bin(3)
231.SH "HISTORY"
74dab6c2 232\fIBN_zero()\fR, \fIBN_one()\fR and \fIBN_set_word()\fR are available in all versions of
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233SSLeay and OpenSSL. \fIBN_value_one()\fR and \fIBN_get_word()\fR were added in
234SSLeay 0.8.
235.PP
74dab6c2 236\fIBN_value_one()\fR was changed to return a true const BIGNUM * in OpenSSL
984263bc 2370.9.7.
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238
239.rn }` ''
240.IX Title "BN_zero 3"
241.IX Name "BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment
242operations"
243
244.IX Header "NAME"
245
246.IX Header "SYNOPSIS"
247
248.IX Header "DESCRIPTION"
249
250.IX Header "RETURN VALUES"
251
252.IX Header "BUGS"
253
254.IX Header "SEE ALSO"
255
256.IX Header "HISTORY"
257