Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / BN_CTX_new.3
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124.\" ========================================================================
125.\"
126.IX Title "BN_CTX_new 3"
e3261593 127.TH BN_CTX_new 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/bn.h>
e257b235 138\&
984263bc 139\& BN_CTX *BN_CTX_new(void);
e257b235 140\&
984263bc 141\& void BN_CTX_init(BN_CTX *c);
e257b235 142\&
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143\& void BN_CTX_free(BN_CTX *c);
144.Ve
145.SH "DESCRIPTION"
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146.IX Header "DESCRIPTION"
147A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
148library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
984263bc 149is rather expensive when used in conjunction with repeated subroutine
8b0cefbb 150calls, the \fB\s-1BN_CTX\s0\fR structure is used.
984263bc 151.PP
8b0cefbb 152\&\fIBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR
984263bc 153structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
8b0cefbb 154\&\fB\s-1BN_CTX\s0\fR.
984263bc 155.PP
8b0cefbb 156\&\fIBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was
984263bc 157created by \fIBN_CTX_new()\fR, also the structure itself.
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158If \fIBN_CTX_start\fR\|(3) has been used on the \fB\s-1BN_CTX\s0\fR,
159\&\fIBN_CTX_end\fR\|(3) must be called before the \fB\s-1BN_CTX\s0\fR
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160may be freed by \fIBN_CTX_free()\fR.
161.SH "RETURN VALUES"
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162.IX Header "RETURN VALUES"
163\&\fIBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails,
164it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
165\&\fIERR_get_error\fR\|(3).
984263bc 166.PP
8b0cefbb 167\&\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
984263bc 168.SH "SEE ALSO"
74dab6c2 169.IX Header "SEE ALSO"
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170\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3),
171\&\fIBN_CTX_start\fR\|(3)
172.SH "HISTORY"
74dab6c2 173.IX Header "HISTORY"
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174\&\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
175and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.