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d2i_DSAPublicKey.3ssl

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.\" ========================================================================
.\"
.IX Title "d2i_DSAPublicKey 3"
.TH d2i_DSAPublicKey 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
d2i_DSAPublicKey, i2d_DSAPublicKey, d2i_DSAPrivateKey, i2d_DSAPrivateKey,
d2i_DSA_PUBKEY, i2d_DSA_PUBKEY, d2i_DSAparams, i2d_DSAparams, d2i_DSA_SIG, i2d_DSA_SIG \- DSA key encoding
and parsing functions.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\& #include <openssl/dsa.h>
\& #include <openssl/x509.h>
\&
\& DSA * d2i_DSAPublicKey(DSA **a, const unsigned char **pp, long length);
\&
\& int i2d_DSAPublicKey(const DSA *a, unsigned char **pp);
\&
\& DSA * d2i_DSA_PUBKEY(DSA **a, const unsigned char **pp, long length);
\&
\& int i2d_DSA_PUBKEY(const DSA *a, unsigned char **pp);
\&
\& DSA * d2i_DSAPrivateKey(DSA **a, const unsigned char **pp, long length);
\&
\& int i2d_DSAPrivateKey(const DSA *a, unsigned char **pp);
\&
\& DSA * d2i_DSAparams(DSA **a, const unsigned char **pp, long length);
\&
\& int i2d_DSAparams(const DSA *a, unsigned char **pp);
\&
\& DSA * d2i_DSA_SIG(DSA_SIG **a, const unsigned char **pp, long length);
\&
\& int i2d_DSA_SIG(const DSA_SIG *a, unsigned char **pp);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBd2i_DSAPublicKey()\fR and \fBi2d_DSAPublicKey()\fR decode and encode the \s-1DSA\s0 public key
components structure.
.PP
\&\fBd2i_DSA_PUBKEY()\fR and \fBi2d_DSA_PUBKEY()\fR decode and encode an \s-1DSA\s0 public key using
a SubjectPublicKeyInfo (certificate public key) structure.
.PP
\&\fBd2i_DSAPrivateKey()\fR, \fBi2d_DSAPrivateKey()\fR decode and encode the \s-1DSA\s0 private key
components.
.PP
\&\fBd2i_DSAparams()\fR, \fBi2d_DSAparams()\fR decode and encode the \s-1DSA\s0 parameters using
a \fBDss-Parms\fR structure as defined in \s-1RFC2459.\s0
.PP
\&\fBd2i_DSA_SIG()\fR, \fBi2d_DSA_SIG()\fR decode and encode a \s-1DSA\s0 signature using a
\&\fBDss-Sig-Value\fR structure as defined in \s-1RFC2459.\s0
.PP
The usage of all of these functions is similar to the \fBd2i_X509()\fR and
\&\fBi2d_X509()\fR described in the \fBd2i_X509\fR\|(3) manual page.
.SH "NOTES"
.IX Header "NOTES"
The \fB\s-1DSA\s0\fR 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 \fB\s-1DSA_PUBKEY\s0\fR functions should be used in preference to the \fBDSAPublicKey\fR
functions when encoding public keys because they use a standard format.
.PP
The \fBDSAPublicKey\fR functions use an non standard format the actual data encoded
depends on the value of the \fBwrite_params\fR field of the \fBa\fR key parameter.
If \fBwrite_params\fR is zero then only the \fBpub_key\fR field is encoded as an
\&\fB\s-1INTEGER\s0\fR. If \fBwrite_params\fR is 1 then a \fB\s-1SEQUENCE\s0\fR consisting of the
\&\fBp\fR, \fBq\fR, \fBg\fR and \fBpub_key\fR respectively fields are encoded.
.PP
The \fBDSAPrivateKey\fR functions also use a non standard structure consiting
consisting of a \s-1SEQUENCE\s0 containing the \fBp\fR, \fBq\fR, \fBg\fR and \fBpub_key\fR and
\&\fBpriv_key\fR fields respectively.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\s-1TBA\s0

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