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BN_new() and BN_secure_new() not only allocate memory, but also initialise it to deterministic value - 0. Document that behaviour to make it explicit Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4438)
64 lines
1.6 KiB
Plaintext
64 lines
1.6 KiB
Plaintext
=pod
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=head1 NAME
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BN_new, BN_secure_new, BN_clear, BN_free, BN_clear_free - allocate and free BIGNUMs
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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BIGNUM *BN_new(void);
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BIGNUM *BN_secure_new(void);
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void BN_clear(BIGNUM *a);
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void BN_free(BIGNUM *a);
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void BN_clear_free(BIGNUM *a);
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=head1 DESCRIPTION
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BN_new() allocates and initializes a B<BIGNUM> structure.
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BN_secure_new() does the same except that the secure heap
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OPENSSL_secure_malloc(3) is used to store the value.
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BN_clear() is used to destroy sensitive data such as keys when they
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are no longer needed. It erases the memory used by B<a> and sets it
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to the value 0.
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BN_free() frees the components of the B<BIGNUM>, and if it was created
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by BN_new(), also the structure itself. BN_clear_free() additionally
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overwrites the data before the memory is returned to the system.
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If B<a> is NULL, nothing is done.
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=head1 RETURN VALUES
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BN_new() and BN_secure_new()
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return a pointer to the B<BIGNUM> initialised to the value 0.
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If the allocation fails,
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they return B<NULL> and set an error code that can be obtained
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by L<ERR_get_error(3)>.
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BN_clear(), BN_free() and BN_clear_free() have no return values.
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=head1 SEE ALSO
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L<ERR_get_error(3)>
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=head1 HISTORY
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BN_init() was removed in OpenSSL 1.1.0; use BN_new() instead.
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=head1 COPYRIGHT
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Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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