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[dragonfly.git] / secure / lib / libcrypto / man / BN_CTX_new.3
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80.\" If the F register is turned on, we'll generate
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96.TH BN_CTX_new 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_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures
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\& BN_CTX *BN_CTX_new(void);
199.Ve
200.Vb 1
201\& void BN_CTX_init(BN_CTX *c);
202.Ve
203.Vb 1
204\& void BN_CTX_free(BN_CTX *c);
205.Ve
206.SH "DESCRIPTION"
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207A \fBBN_CTX\fR is a structure that holds \fBBIGNUM\fR temporary variables used by
208library functions. Since dynamic memory allocation to create \fBBIGNUM\fRs
984263bc 209is rather expensive when used in conjunction with repeated subroutine
74dab6c2 210calls, the \fBBN_CTX\fR structure is used.
984263bc 211.PP
74dab6c2 212\fIBN_CTX_new()\fR allocates and initializes a \fBBN_CTX\fR
984263bc 213structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
74dab6c2 214\fBBN_CTX\fR.
984263bc 215.PP
74dab6c2 216\fIBN_CTX_free()\fR frees the components of the \fBBN_CTX\fR, and if it was
984263bc 217created by \fIBN_CTX_new()\fR, also the structure itself.
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218If BN_CTX_start(3) has been used on the \fBBN_CTX\fR,
219BN_CTX_end(3) must be called before the \fBBN_CTX\fR
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220may be freed by \fIBN_CTX_free()\fR.
221.SH "RETURN VALUES"
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222\fIBN_CTX_new()\fR returns a pointer to the \fBBN_CTX\fR. If the allocation fails,
223it returns \fBNULL\fR and sets an error code that can be obtained by
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224ERR_get_error(3).
225.PP
74dab6c2 226\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
984263bc 227.SH "SEE ALSO"
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228bn(3), ERR_get_error(3), BN_add(3),
229BN_CTX_start(3)
230.SH "HISTORY"
74dab6c2 231\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
984263bc 232and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.
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233
234.rn }` ''
235.IX Title "BN_CTX_new 3"
236.IX Name "BN_CTX_new, BN_CTX_init, BN_CTX_free - allocate and free BN_CTX structures"
237
238.IX Header "NAME"
239
240.IX Header "SYNOPSIS"
241
242.IX Header "DESCRIPTION"
243
244.IX Header "RETURN VALUES"
245
246.IX Header "SEE ALSO"
247
248.IX Header "HISTORY"
249