.\" $OpenBSD: d2i_DSAPublicKey.3,v 1.3 2016/12/05 20:36:19 schwarze Exp $ .\" OpenSSL bb9ad09e Jun 6 00:43:05 2016 -0400 .\" .\" This file was written by Dr. Stephen Henson . .\" Copyright (c) 2002, 2003, 2013, 2015, 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: December 5 2016 $ .Dt D2I_DSAPUBLICKEY 3 .Os .Sh NAME .Nm d2i_DSAPublicKey , .Nm i2d_DSAPublicKey , .Nm d2i_DSAPrivateKey , .Nm i2d_DSAPrivateKey , .Nm d2i_DSA_PUBKEY , .Nm i2d_DSA_PUBKEY , .Nm d2i_DSA_PUBKEY_bio , .Nm d2i_DSA_PUBKEY_fp , .Nm i2d_DSA_PUBKEY_bio , .Nm i2d_DSA_PUBKEY_fp , .Nm d2i_DSAparams , .Nm i2d_DSAparams , .Nm d2i_DSA_SIG , .Nm i2d_DSA_SIG .Nd DSA key encoding and parsing functions .Sh SYNOPSIS .In openssl/dsa.h .In openssl/x509.h .Ft DSA * .Fo d2i_DSAPublicKey .Fa "DSA **a" .Fa "const unsigned char **pp" .Fa "long length" .Fc .Ft int .Fo i2d_DSAPublicKey .Fa "const DSA *a" .Fa "unsigned char **pp" .Fc .Ft DSA * .Fo d2i_DSA_PUBKEY .Fa "DSA **a" .Fa "const unsigned char **pp" .Fa "long length" .Fc .Ft int .Fo i2d_DSA_PUBKEY .Fa "const DSA *a" .Fa "unsigned char **pp" .Fc .Ft DSA * .Fo d2i_DSA_PUBKEY_bio .Fa "BIO *bp" .Fa "DSA **dsa" .Fc .Ft DSA * .Fo d2i_DSA_PUBKEY_fp .Fa "FILE *fp" .Fa "DSA *dsa" .Fc .Ft int .Fo i2d_DSA_PUBKEY_bio .Fa "BIO *bp" .Fa "DSA *dsa" .Fc .Ft int .Fo i2d_DSA_PUBKEY_fp .Fa "FILE *fp" .Fa "DSA *dsa" .Fc .Ft DSA * .Fo d2i_DSAPrivateKey .Fa "DSA **a" .Fa "const unsigned char **pp" .Fa "long length" .Fc .Ft int .Fo i2d_DSAPrivateKey .Fa "const DSA *a" .Fa "unsigned char **pp" .Fc .Ft DSA * .Fo d2i_DSAparams .Fa "DSA **a" .Fa "const unsigned char **pp" .Fa "long length" .Fc .Ft int .Fo i2d_DSAparams .Fa "const DSA *a" .Fa "unsigned char **pp" .Fc .Ft DSA * .Fo d2i_DSA_SIG .Fa "DSA_SIG **a" .Fa "const unsigned char **pp" .Fa "long length" .Fc .Ft int .Fo i2d_DSA_SIG .Fa "const DSA_SIG *a" .Fa "unsigned char **pp" .Fc .Sh DESCRIPTION .Fn d2i_DSAPublicKey and .Fn i2d_DSAPublicKey decode and encode the DSA public key components structure. .Pp .Fn d2i_DSA_PUBKEY and .Fn i2d_DSA_PUBKEY decode and encode a DSA public key using a SubjectPublicKeyInfo (certificate public key) structure. .Pp .Fn d2i_DSA_PUBKEY_bio , .Fn d2i_DSA_PUBKEY_fp , .Fn i2d_DSA_PUBKEY_bio , and .Fn i2d_DSA_PUBKEY_fp are similar to .Fn d2i_DSA_PUBKEY and .Fn i2d_DSA_PUBKEY except that they decode or encode using a .Vt BIO or .Vt FILE pointer. .Pp .Fn d2i_DSAPrivateKey and .Fn i2d_DSAPrivateKey decode and encode the DSA private key components. .Pp .Fn d2i_DSAparams and .Fn i2d_DSAparams decode and encode the DSA parameters using a .Sy Dss-Parms structure as defined in RFC2459. .Pp .Fn d2i_DSA_SIG and .Fn i2d_DSA_SIG decode and encode a DSA signature using a .Sy Dss-Sig-Value structure as defined in RFC2459. .Pp The usage of all of these functions is similar to .Xr d2i_X509 3 and .Xr i2d_X509 3 . .Pp The .Vt DSA structure passed to the private key encoding functions should have all the private key components present. .Pp The data encoded by the private key functions is unencrypted and therefore offers no private key security. .Pp The .Fn *_DSA_PUBKEY functions should be used in preference to the .Fn *_DSAPublicKey functions when encoding public keys because they use a standard format. .Pp The .Fn *_DSAPublicKey functions use an non-standard format. The actual data encoded depends on the value of .Fa a->write_params . If .Fa a->write_params is zero, then only the .Fa a->pub_key field is encoded as an .Sy INTEGER . If .Fa a->write_params is 1, then a .Sy SEQUENCE consisting of the .Fa a->p , .Fa a->q , .Fa a->g , and .Fa a->pub_key fields is encoded. .Pp The .Fn *_DSAPrivateKey functions also use a non-standard structure consisting of a SEQUENCE containing the .Fa a->p , .Fa a->q , .Fa a->g , .Fa a->pub_key , and .Fa a->priv_key fields. .Sh SEE ALSO .Xr d2i_X509 3