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=head1 NAME

DSA_SIG_get0, DSA_SIG_set0,
DSA_SIG_new, DSA_SIG_free - allocate and free DSA signature objects

=head1 SYNOPSIS

 #include <openssl/dsa.h>

 DSA_SIG *DSA_SIG_new(void);
 void DSA_SIG_free(DSA_SIG *a);
 void DSA_SIG_get0(const DSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps);
 int DSA_SIG_set0(DSA_SIG *sig, BIGNUM *r, BIGNUM *s);

=head1 DESCRIPTION

DSA_SIG_new() allocates an empty B<DSA_SIG> structure.

DSA_SIG_free() frees the B<DSA_SIG> structure and its components. The
values are erased before the memory is returned to the system.

DSA_SIG_get0() returns internal pointers to the B<r> and B<s> values contained
in B<sig>.

The B<r> and B<s> values can be set by calling DSA_SIG_set0() and passing the
new values for B<r> and B<s> as parameters to the function. Calling this
function transfers the memory management of the values to the DSA_SIG object,
and therefore the values that have been passed in should not be freed directly
after this function has been called.

=head1 RETURN VALUES

If the allocation fails, DSA_SIG_new() returns B<NULL> and sets an
error code that can be obtained by
L<ERR_get_error(3)>. Otherwise it returns a pointer
to the newly allocated structure.

DSA_SIG_free() returns no value.

DSA_SIG_set0() returns 1 on success or 0 on failure.

=head1 SEE ALSO

L<EVP_PKEY_new(3)>, L<EVP_PKEY_free(3)>, L<EVP_PKEY_get_bn_param(3)>,
L<ERR_get_error(3)>

=head1 COPYRIGHT

Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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>.

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