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[dragonfly.git] / secure / lib / libcrypto / man / BN_CTX_start.3
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80.\" If the F register is turned on, we'll generate
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82.\" TH Title
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96.TH BN_CTX_start 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
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188.\}
189.rm #[ #] #H #V #F C
984263bc 190.SH "NAME"
74dab6c2 191BN_CTX_start, BN_CTX_get, BN_CTX_end \- use temporary BIGNUM variables
984263bc 192.SH "SYNOPSIS"
74dab6c2 193.PP
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194.Vb 1
195\& #include <openssl/bn.h>
196.Ve
197.Vb 1
198\& void BN_CTX_start(BN_CTX *ctx);
199.Ve
200.Vb 1
201\& BIGNUM *BN_CTX_get(BN_CTX *ctx);
202.Ve
203.Vb 1
204\& void BN_CTX_end(BN_CTX *ctx);
205.Ve
206.SH "DESCRIPTION"
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207These functions are used to obtain temporary \fBBIGNUM\fR variables from
208a \fBBN_CTX\fR (which can been created by using BN_CTX_new(3))
984263bc 209in order to save the overhead of repeatedly creating and
74dab6c2 210freeing \fBBIGNUM\fRs in functions that are called from inside a loop.
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211.PP
212A function must call \fIBN_CTX_start()\fR first. Then, \fIBN_CTX_get()\fR may be
74dab6c2 213called repeatedly to obtain temporary \fBBIGNUM\fRs. All \fIBN_CTX_get()\fR
984263bc 214calls must be made before calling any other functions that use the
74dab6c2 215\fBctx\fR as an argument.
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216.PP
217Finally, \fIBN_CTX_end()\fR must be called before returning from the function.
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218When \fIBN_CTX_end()\fR is called, the \fBBIGNUM\fR pointers obtained from
219\fIBN_CTX_get()\fR become invalid.
984263bc 220.SH "RETURN VALUES"
74dab6c2 221\fIBN_CTX_start()\fR and \fIBN_CTX_end()\fR return no values.
984263bc 222.PP
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223\fIBN_CTX_get()\fR returns a pointer to the \fBBIGNUM\fR, or \fBNULL\fR on error.
224Once \fIBN_CTX_get()\fR has failed, the subsequent calls will return \fBNULL\fR
984263bc 225as well, so it is sufficient to check the return value of the last
74dab6c2 226\fIBN_CTX_get()\fR call. In case of an error, an error code is set, which
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227can be obtained by ERR_get_error(3).
228.SH "SEE ALSO"
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229BN_CTX_new(3)
230.SH "HISTORY"
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231\fIBN_CTX_start()\fR, \fIBN_CTX_get()\fR and \fIBN_CTX_end()\fR were added in OpenSSL 0.9.5.
232
233.rn }` ''
234.IX Title "BN_CTX_start 3"
235.IX Name "BN_CTX_start, BN_CTX_get, BN_CTX_end - use temporary BIGNUM variables"
236
237.IX Header "NAME"
238
239.IX Header "SYNOPSIS"
240
241.IX Header "DESCRIPTION"
242
243.IX Header "RETURN VALUES"
244
245.IX Header "SEE ALSO"
246
984263bc 247.IX Header "HISTORY"
74dab6c2 248