BN_CTX_secure_new (3)

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NAME

BN_CTX_new, BN_CTX_secure_new, BN_CTX_free - allocate and free BN_CTX structures

SYNOPSIS

 #include <openssl/bn.h>

 BN_CTX *BN_CTX_new(void);

 BN_CTX *BN_CTX_secure_new(void);

 void BN_CTX_free(BN_CTX *c);

DESCRIPTION

A is a structure that holds temporary variables used by library functions. Since dynamic memory allocation to create s is rather expensive when used in conjunction with repeated subroutine calls, the structure is used.

BN_CTX_new() allocates and initializes a

structure. BN_CTX_secure_new() allocates and initializes a structure but uses the secure heap (see CRYPTO_secure_malloc(3)) to hold the s.

BN_CTX_free() frees the components of the

, and if it was created by BN_CTX_new(), also the structure itself. If BN_CTX_start(3) has been used on the , BN_CTX_end(3) must be called before the may be freed by BN_CTX_free(). If c is nothing is done.

RETURN VALUES

BN_CTX_new() and BN_CTX_secure_new() return a pointer to the . If the allocation fails, they return and sets an error code that can be obtained by ERR_get_error(3).

BN_CTX_free() has no return values.

REMOVED FUNCTIONALITY

 void BN_CTX_init(BN_CTX *c);

BN_CTX_init() is no longer available as of OpenSSL 1.1.0. Applications should replace use of BN_CTX_init with BN_CTX_new instead:

 BN_CTX *ctx;
 ctx = BN_CTX_new();
 if(!ctx) /* Handle error */
 ...
 BN_CTX_free(ctx);

SEE ALSO

ERR_get_error(3), BN_add(3), BN_CTX_start(3)

HISTORY

BN_CTX_init() was removed in OpenSSL 1.1.0.

COPYRIGHT

Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the ``License''). You may not use this file except in compliance with the License. You can obtain a copy in the file

in the source distribution or at <www.openssl.org/source/license.html>.