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BN_CTX_new.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_CTX_new, BN_CTX_secure_new, BN_CTX_free \- allocate and free BN_CTX structures .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BN_CTX *BN_CTX_new(void); \& \& BN_CTX *BN_CTX_secure_new(void); \& \& void BN_CTX_free(BN_CTX *c); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \fB\s-1BN_CTX\s0\fR is a structure that holds \fB\s-1BIGNUM\s0\fR temporary variables used by library functions. Since dynamic memory allocation to create \fB\s-1BIGNUM\s0\fRs is rather expensive when used in conjunction with repeated subroutine calls, the \fB\s-1BN_CTX\s0\fR structure is used. .PP \&\fBBN_CTX_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR structure. \&\fBBN_CTX_secure_new()\fR allocates and initializes a \fB\s-1BN_CTX\s0\fR structure but uses the secure heap (see \fBCRYPTO_secure_malloc\fR\|(3)) to hold the \&\fB\s-1BIGNUM\s0\fRs. .PP \&\fBBN_CTX_free()\fR frees the components of the \fB\s-1BN_CTX\s0\fR and the structure itself. Since \fBBN_CTX_start()\fR is required in order to obtain \fB\s-1BIGNUM\s0\fRs from the \&\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 be freed by \fBBN_CTX_free()\fR. If \fBc\fR is \s-1NULL,\s0 nothing is done. .PP A given \fB\s-1BN_CTX\s0\fR must only be used by a single thread of execution. No locking is performed, and the internal pool allocator will not properly handle multiple threads of execution. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_CTX_new()\fR and \fBBN_CTX_secure_new()\fR return a pointer to the \fB\s-1BN_CTX\s0\fR. If the allocation fails, they return \fB\s-1NULL\s0\fR and sets an error code that can be obtained by \&\fBERR_get_error\fR\|(3). .PP \&\fBBN_CTX_free()\fR has no return values. .SH "REMOVED FUNCTIONALITY" .IX Header "REMOVED FUNCTIONALITY" .Vb 1 \& void BN_CTX_init(BN_CTX *c); .Ve .PP \&\fBBN_CTX_init()\fR is no longer available as of OpenSSL 1.1.0. Applications should replace use of BN_CTX_init with BN_CTX_new instead: .PP .Vb 6 \& BN_CTX *ctx; \& ctx = BN_CTX_new(); \& if (!ctx) \& /* error */ \& ... \& BN_CTX_free(ctx); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3), \&\fBBN_CTX_start\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_CTX_init()\fR was removed in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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