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author | Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org> | 2021-04-30 00:33:56 +0200 |
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committer | Wojtek Kosior <wk@koszkonutek-tmp.pl.eu.org> | 2021-04-30 00:33:56 +0200 |
commit | aa4d426b4d3527d7e166df1a05058c9a4a0f6683 (patch) | |
tree | 4ff17ce8b89a2321b9d0ed4bcfc37c447bcb6820 /openssl-1.1.0h/doc/crypto/BN_copy.pod | |
download | smtps-and-pop3s-console-program-master.tar.gz smtps-and-pop3s-console-program-master.zip |
Diffstat (limited to 'openssl-1.1.0h/doc/crypto/BN_copy.pod')
-rw-r--r-- | openssl-1.1.0h/doc/crypto/BN_copy.pod | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/openssl-1.1.0h/doc/crypto/BN_copy.pod b/openssl-1.1.0h/doc/crypto/BN_copy.pod new file mode 100644 index 0000000..46de544 --- /dev/null +++ b/openssl-1.1.0h/doc/crypto/BN_copy.pod @@ -0,0 +1,69 @@ +=pod + +=head1 NAME + +BN_copy, BN_dup, BN_with_flags - copy BIGNUMs + +=head1 SYNOPSIS + + #include <openssl/bn.h> + + BIGNUM *BN_copy(BIGNUM *to, const BIGNUM *from); + + BIGNUM *BN_dup(const BIGNUM *from); + + void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags); + +=head1 DESCRIPTION + +BN_copy() copies B<from> to B<to>. BN_dup() creates a new B<BIGNUM> +containing the value B<from>. + +BN_with_flags creates a B<temporary> shallow copy of B<b> in B<dest>. It places +significant restrictions on the copied data. Applications that do no adhere to +these restrictions may encounter unexpected side effects or crashes. For that +reason use of this function is discouraged. Any flags provided in B<flags> will +be set in B<dest> in addition to any flags already set in B<b>. For example this +might commonly be used to create a temporary copy of a BIGNUM with the +B<BN_FLG_CONSTTIME> flag set for constant time operations. The temporary copy in +B<dest> will share some internal state with B<b>. For this reason the following +restrictions apply to the use of B<dest>: + +=over 2 + +=item * + +B<dest> should be a newly allocated BIGNUM obtained via a call to BN_new(). It +should not have been used for other purposes or initialised in any way. + +=item * + +B<dest> must only be used in "read-only" operations, i.e. typically those +functions where the relevant parameter is declared "const". + +=item * + +B<dest> must be used and freed before any further subsequent use of B<b> + +=back + +=head1 RETURN VALUES + +BN_copy() returns B<to> on success, NULL on error. BN_dup() returns +the new B<BIGNUM>, and NULL on error. The error codes can be obtained +by L<ERR_get_error(3)>. + +=head1 SEE ALSO + +L<ERR_get_error(3)> + +=head1 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 LICENSE in the source distribution or at +L<https://www.openssl.org/source/license.html>. + +=cut |