9e183d2271
Add 2017 copyright year
Add missing typedef to NAME
Remove ec(7) and bn(7) doc links
Remove .pod link errors, bogus links, make a few typo corrections
Fix some typo's in links and some missing items.
Don't link to C runtime functions (See OPENSSL_malloc for example/precedent)
Document ASN1_tag2str(), add a few typedef's that were missing from NAME
Update doc-nits target; addresses
https://github.com/openssl/openssl/pull/1900#issuecomment-259943891,
Merge check-doc-links into find-doc-nits; if run regularly, would have found
https://github.com/openssl/openssl/pull/2825
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2862)
76 lines
2 KiB
Text
76 lines
2 KiB
Text
=pod
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=head1 NAME
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BN_CTX_new, BN_CTX_secure_new, BN_CTX_free - allocate and free BN_CTX structures
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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BN_CTX *BN_CTX_new(void);
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BN_CTX *BN_CTX_secure_new(void);
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void BN_CTX_free(BN_CTX *c);
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=head1 DESCRIPTION
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A B<BN_CTX> is a structure that holds B<BIGNUM> temporary variables used by
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library functions. Since dynamic memory allocation to create B<BIGNUM>s
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is rather expensive when used in conjunction with repeated subroutine
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calls, the B<BN_CTX> structure is used.
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BN_CTX_new() allocates and initializes a B<BN_CTX> structure.
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BN_CTX_secure_new() allocates and initializes a B<BN_CTX> structure
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but uses the secure heap (see L<CRYPTO_secure_malloc(3)>) to hold the
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B<BIGNUM>s.
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BN_CTX_free() frees the components of the B<BN_CTX>, and if it was
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created by BN_CTX_new(), also the structure itself.
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If L<BN_CTX_start(3)> has been used on the B<BN_CTX>,
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L<BN_CTX_end(3)> must be called before the B<BN_CTX>
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may be freed by BN_CTX_free().
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If B<c> is NULL, nothing is done.
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=head1 RETURN VALUES
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BN_CTX_new() and BN_CTX_secure_new() return a pointer to the B<BN_CTX>.
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If the allocation fails,
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they return B<NULL> and sets an error code that can be obtained by
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L<ERR_get_error(3)>.
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BN_CTX_free() has no return values.
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=head1 REMOVED FUNCTIONALITY
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void BN_CTX_init(BN_CTX *c);
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BN_CTX_init() is no longer available as of OpenSSL 1.1.0. Applications should
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replace use of BN_CTX_init with BN_CTX_new instead:
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BN_CTX *ctx;
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ctx = BN_CTX_new();
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if(!ctx) /* Handle error */
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...
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BN_CTX_free(ctx);
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<BN_add(3)>,
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L<BN_CTX_start(3)>
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=head1 HISTORY
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BN_CTX_init() was removed in OpenSSL 1.1.0.
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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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