Name

BN_new, BN_init, BN_clear
BN_free, BN_clear_free

Allocates and frees BIGNUMs

Library

libcrypto.lib

Synopsis

#include <openssl/bn.h>

BIGNUM *BN_new(void);

void BN_init(BIGNUM *);

void BN_clear(BIGNUM *a);

void BN_free(BIGNUM *a);

void BN_clear_free(BIGNUM *a);

Detailed Description

BN_new() allocates and initializes a BIGNUM structure. BN_init() initializes an existing uninitialized BIGNUM.

BN_clear() is used to destroy sensitive data such as keys when they are no longer needed. It erases the memory used by a and sets it to the value 0.

BN_free() frees the components of the BIGNUM, and if it was created by BN_new(), also the structure itself. BN_clear_free() additionally overwrites the data before the memory is returned to the system.

Return Values

BN_new() returns a pointer to the BIGNUM. If the allocation fails, it returns NULL and sets an error code that can be obtained by ERR_get_error().

BN_init(), BN_clear(), BN_free() and BN_clear_free() have no return values.

History

BN_new(), BN_clear(), BN_free() and BN_clear_free() are available in all versions on SSLeay and OpenSSL. BN_init() was added in SSLeay 0.9.1b.

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