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136 .IX Title "BN_CTX_new 3"
137 .TH BN_CTX_new 3 "2002-09-25" "1.1.0-dev" "OpenSSL"
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143 BN_CTX_new, BN_CTX_init, BN_CTX_free \- allocate and free BN_CTX structures
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/bn.h>
151 \& BN_CTX *BN_CTX_new(void);
153 \& void BN_CTX_init(BN_CTX *c);
155 \& void BN_CTX_free(BN_CTX *c);
158 .IX Header "DESCRIPTION"
159 A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
160 library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
161 is rather expensive when used in conjunction with repeated subroutine
162 calls, the \fB\s-1BN_CTX\s0\fR structure is used.
164 \&\fIBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR
165 structure. \fIBN_CTX_init()\fR initializes an existing uninitialized
166 \&\fB\s-1BN_CTX\s0\fR.
168 \&\fIBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR, and if it was
169 created by \fIBN_CTX_new()\fR, also the structure itself.
170 If \fIBN_CTX_start\fR\|(3) has been used on the \fB\s-1BN_CTX\s0\fR,
171 \&\fIBN_CTX_end\fR\|(3) must be called before the \fB\s-1BN_CTX\s0\fR
172 may be freed by \fIBN_CTX_free()\fR.
174 .IX Header "RETURN VALUES"
175 \&\fIBN_CTX_new()\fR returns a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails,
176 it returns \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
177 \&\fIERR_get_error\fR\|(3).
179 \&\fIBN_CTX_init()\fR and \fIBN_CTX_free()\fR have no return values.
181 .IX Header "SEE ALSO"
182 \&\fIopenssl_bn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3),
183 \&\fIBN_CTX_start\fR\|(3)
186 \&\fIBN_CTX_new()\fR and \fIBN_CTX_free()\fR are available in all versions on SSLeay
187 and OpenSSL. \fIBN_CTX_init()\fR was added in SSLeay 0.9.1b.