.\" $OpenBSD: DSA_get0_pqg.3,v 1.4 2018/03/23 23:18:17 schwarze Exp $ .\" full merge up to: OpenSSL e90fc053 Jul 15 09:39:45 2017 -0400 .\" .\" This file was written by Matt Caswell . .\" Copyright (c) 2016 The OpenSSL Project. All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in .\" the documentation and/or other materials provided with the .\" distribution. .\" .\" 3. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: March 23 2018 $ .Dt DSA_GET0_PQG 3 .Os .Sh NAME .Nm DSA_get0_pqg , .Nm DSA_set0_pqg , .Nm DSA_get0_key , .Nm DSA_set0_key , .Nm DSA_clear_flags , .Nm DSA_test_flags , .Nm DSA_set_flags , .Nm DSA_get0_engine .Nd get data from and set data in a DSA object .Sh SYNOPSIS .In openssl/dsa.h .Ft void .Fo DSA_get0_pqg .Fa "const DSA *d" .Fa "const BIGNUM **p" .Fa "const BIGNUM **q" .Fa "const BIGNUM **g" .Fc .Ft int .Fo DSA_set0_pqg .Fa "DSA *d" .Fa "BIGNUM *p" .Fa "BIGNUM *q" .Fa "BIGNUM *g" .Fc .Ft void .Fo DSA_get0_key .Fa "const DSA *d" .Fa "const BIGNUM **pub_key" .Fa "const BIGNUM **priv_key" .Fc .Ft int .Fo DSA_set0_key .Fa "DSA *d" .Fa "BIGNUM *pub_key" .Fa "BIGNUM *priv_key" .Fc .Ft void .Fo DSA_clear_flags .Fa "DSA *d" .Fa "int flags" .Fc .Ft int .Fo DSA_test_flags .Fa "const DSA *d" .Fa "int flags" .Fc .Ft void .Fo DSA_set_flags .Fa "DSA *d" .Fa "int flags" .Fc .Ft ENGINE * .Fo DSA_get0_engine .Fa "DSA *d" .Fc .Sh DESCRIPTION A .Vt DSA object contains the parameters .Fa p , .Fa q , and .Fa g . It also contains a public key .Fa pub_key and an optional private key .Fa priv_key . .Pp The .Fa p , .Fa q , and .Fa g parameters can be obtained by calling .Fn DSA_get0_pqg . If the parameters have not yet been set, then .Pf * Fa p , .Pf * Fa q , and .Pf * Fa g are set to .Dv NULL . Otherwise, they are set to pointers to the internal representations of the values that should not be freed by the application. .Pp The .Fa p , .Fa q , and .Fa g values can be set by calling .Fn DSA_set0_pqg . Calling this function transfers the memory management of the values to .Fa d , and therefore they should not be freed by the caller. .Pp The .Fn DSA_get0_key function stores pointers to the internal representations of the public key in .Pf * Fa pub_key and to the private key in .Pf * Fa priv_key . Either may be .Dv NULL if it has not yet been set. If the private key has been set, then the public key must be. .Pp The public and private key values can be set using .Fn DSA_set0_key . The public key must be .Pf non- Dv NULL the first time this function is called on a given .Vt DSA object. The private key may be .Dv NULL . On subsequent calls, either may be .Dv NULL , which means the corresponding .Vt DSA field is left untouched. .Fn DSA_set0_key transfers the memory management of the key values to .Fa d , and therefore they should not be freed by the caller. .Pp Values retrieved with .Fn DSA_get0_pqg and .Fn DSA_get0_key are owned by the .Vt DSA object and may therefore not be passed to .Fn DSA_set0_pqg or .Fn DSA_set0_key . If needed, duplicate the received values using .Xr BN_dup 3 and pass the duplicates. .Pp .Fn DSA_clear_flags clears the specified .Fa flags in .Fa d . .Fn DSA_test_flags tests the .Fa flags in .Fa d . .Fn DSA_set_flags sets the .Fa flags in .Fa d ; any flags already set remain set. For all three functions, multiple flags can be passed in one call, OR'ed together bitwise. .Sh RETURN VALUES .Fn DSA_set0_pqg and .Fn DSA_set0_key return 1 on success or 0 on failure. .Pp .Fn DSA_test_flags returns those of the given .Fa flags currently set in .Fa d or 0 if none of the given .Fa flags are set. .Pp .Fn DSA_get0_engine returns a pointer to the .Vt ENGINE used by the .Vt DSA object Fa d , or .Dv NULL if no engine was set for this object. .Sh SEE ALSO .Xr DSA_do_sign 3 , .Xr DSA_dup_DH 3 , .Xr DSA_generate_key 3 , .Xr DSA_generate_parameters 3 , .Xr DSA_new 3 , .Xr DSA_print 3 , .Xr DSA_sign 3 , .Xr DSA_size 3 .Sh HISTORY These functions first appeared in OpenSSL 1.1.0 and have been available since .Ox 6.3 .