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135 .IX Title "BN_CTX_NEW 3"
136 .TH BN_CTX_NEW 3 "2021-03-25" "1.1.1k" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 BN_CTX_new, BN_CTX_secure_new, BN_CTX_free \- allocate and free BN_CTX structures
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/bn.h>
148 \& BN_CTX *BN_CTX_new(void);
150 \& BN_CTX *BN_CTX_secure_new(void);
152 \& void BN_CTX_free(BN_CTX *c);
155 .IX Header "DESCRIPTION"
156 A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by
157 library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs
158 is rather expensive when used in conjunction with repeated subroutine
159 calls, the \fB\s-1BN_CTX\s0\fR structure is used.
161 \&\fBBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR structure.
162 \&\fBBN_CTX_secure_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR structure
163 but uses the secure heap (see \fBCRYPTO_secure_malloc\fR\|(3)) to hold the
164 \&\fB\s-1BIGNUM\s0\fRs.
166 \&\fBBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR and the structure itself.
167 Since \fBBN_CTX_start()\fR is required in order to obtain \fB\s-1BIGNUM\s0\fRs from the
168 \&\fB\s-1BN_CTX\s0\fR, in most cases \fBBN_CTX_end()\fR must be called before the \fB\s-1BN_CTX\s0\fR may
169 be freed by \fBBN_CTX_free()\fR. If \fBc\fR is \s-1NULL,\s0 nothing is done.
171 A given \fB\s-1BN_CTX\s0\fR must only be used by a single thread of execution. No
172 locking is performed, and the internal pool allocator will not properly handle
173 multiple threads of execution.
175 .IX Header "RETURN VALUES"
176 \&\fBBN_CTX_new()\fR and \fBBN_CTX_secure_new()\fR return a pointer to the \fB\s-1BN_CTX\s0\fR.
177 If the allocation fails,
178 they return \fB\s-1NULL\s0\fR and sets an error code that can be obtained by
179 \&\fBERR_get_error\fR\|(3).
181 \&\fBBN_CTX_free()\fR has no return values.
182 .SH "REMOVED FUNCTIONALITY"
183 .IX Header "REMOVED FUNCTIONALITY"
185 \& void BN_CTX_init(BN_CTX *c);
188 \&\fBBN_CTX_init()\fR is no longer available as of OpenSSL 1.1.0. Applications should
189 replace use of BN_CTX_init with BN_CTX_new instead:
193 \& ctx = BN_CTX_new();
200 .IX Header "SEE ALSO"
201 \&\fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3),
202 \&\fBBN_CTX_start\fR\|(3)
205 \&\fBBN_CTX_init()\fR was removed in OpenSSL 1.1.0.
207 .IX Header "COPYRIGHT"
208 Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
210 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
211 this file except in compliance with the License. You can obtain a copy
212 in the file \s-1LICENSE\s0 in the source distribution or at
213 <https://www.openssl.org/source/license.html>.