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$NetBSD: d2i_DSAPublicKey.3,v 1.1.1.1 2018/02/03 22:43:39 christos Exp $

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Title "d2i_DSAPublicKey 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh 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. libcrypto, -lcrypto 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 Header "DESCRIPTION" \fId2i_DSAPublicKey() and i2d_DSAPublicKey() decode and encode the \s-1DSA\s0 public key components structure.

\fId2i_DSA_PUBKEY() and i2d_DSA_PUBKEY() decode and encode an \s-1DSA\s0 public key using a SubjectPublicKeyInfo (certificate public key) structure.

\fId2i_DSAPrivateKey(), i2d_DSAPrivateKey() decode and encode the \s-1DSA\s0 private key components.

\fId2i_DSAparams(), i2d_DSAparams() decode and encode the \s-1DSA\s0 parameters using a Dss-Parms structure as defined in \s-1RFC2459.\s0

\fId2i_DSA_SIG(), i2d_DSA_SIG() decode and encode a \s-1DSA\s0 signature using a \fBDss-Sig-Value structure as defined in \s-1RFC2459.\s0

The usage of all of these functions is similar to the d2i_X509() and \fIi2d_X509() described in the d2i_X509\|(3) manual page.

Header "NOTES" The \s-1DSA\s0 structure passed to the private key encoding functions should have all the private key components present.

The data encoded by the private key functions is unencrypted and therefore offers no private key security.

The \s-1DSA_PUBKEY\s0 functions should be used in preference to the DSAPublicKey functions when encoding public keys because they use a standard format.

The DSAPublicKey functions use an non standard format the actual data encoded depends on the value of the write_params field of the a key parameter. If write_params is zero then only the pub_key field is encoded as an \fB\s-1INTEGER\s0. If write_params is 1 then a \s-1SEQUENCE\s0 consisting of the \fBp, q, g and pub_key respectively fields are encoded.

The DSAPrivateKey functions also use a non standard structure consiting consisting of a \s-1SEQUENCE\s0 containing the p, q, g and pub_key and \fBpriv_key fields respectively.

Header "SEE ALSO" \fId2i_X509\|(3) Header "HISTORY" \s-1TBA\s0

Indexes created Wed Apr 22 00:22:44 UTC 2026