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<head>
<title>dsa(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>DSA(3)</b><td align=right><b>DSA(3)</b>
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<br>
<p><font size=+1><b>NAME </b></font><br>
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dsagen, dsasign, dsaverify, dsapuballoc, dsapubfree, dsaprivalloc,
dsaprivfree, dsasigalloc, dsasigfree, dsaprivtopub - digital signature
algorithm<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include <u.h><br>
#include <libc.h><br>
#include <mp.h><br>
#include <libsec.h>
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<tt><font size=+1>DSApriv* dsagen(DSApub *opub)
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<tt><font size=+1>DSAsig* dsasign(DSApriv *k, mpint *m)
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<tt><font size=+1>int dsaverify(DSApub *k, DSAsig *sig, mpint *m)
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<tt><font size=+1>DSApub* dsapuballoc(void)
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<tt><font size=+1>void dsapubfree(DSApub*)
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<tt><font size=+1>DSApriv* dsaprivalloc(void)
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<tt><font size=+1>void dsaprivfree(DSApriv*)
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</font></tt>
<tt><font size=+1>DSAsig* dsasigalloc(void)
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<tt><font size=+1>void dsasigfree(DSAsig*)
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<tt><font size=+1>DSApub* dsaprivtopub(DSApriv*)<br>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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DSA is the NIST approved digital signature algorithm. The owner
of a key publishes the public part of the key:<br>
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<tt><font size=+1>struct DSApub<br>
{<br>
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mpint *p; // modulus<br>
mpint *q; // group order, q divides p−1<br>
mpint *alpha; // group generator<br>
mpint *key; // alpha**secret mod p<br>
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};<br>
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This part can be used for verifying signatures (with <i>dsaverify</i>)
created by the owner. The owner signs (with <i>dsasign</i>) using his
private key:<br>
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<tt><font size=+1>struct DSApriv<br>
{<br>
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DSApub pub;<br>
mpint *secret; // (decryption key)<br>
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};<br>
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Keys are generated using <i>dsagen</i>. If <i>dsagen</i>’s argument <i>opub</i> is
<tt><font size=+1>nil</font></tt>, a key is created using a new <tt><font size=+1>p</font></tt> and <tt><font size=+1>q</font></tt> generated by <i>DSAprimes</i>
(see <a href="../man3/prime.html"><i>prime</i>(3)</a>). Otherwise, <tt><font size=+1>p</font></tt> and <tt><font size=+1>q</font></tt> are copied from the old key.
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<i>Dsaprivtopub</i> returns a newly allocated copy of the public key
corresponding to the private key.
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The routines <i>dsapuballoc</i>, <i>dsapubfree</i>, <i>dsaprivalloc</i>, and <i>dsaprivfree</i>
are provided to manage key storage.
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<i>Dsasign</i> signs message <i>m</i> using a private key <i>k</i> yielding a<br>
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<tt><font size=+1>struct DSAsig<br>
{<br>
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mpint *r, *s;<br>
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};<br>
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<i>Dsaverify</i> returns 0 if the signature is valid and –1 if not.
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The routines <i>dsasigalloc</i> and <i>dsasigfree</i> are provided to manage
signature storage.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libsec<br>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/mp.html"><i>mp</i>(3)</a>, <a href="../man3/aes.html"><i>aes</i>(3)</a>, <a href="../man3/blowfish.html"><i>blowfish</i>(3)</a>, <a href="../man3/des.html"><i>des</i>(3)</a>, <a href="../man3/rc4.html"><i>rc4</i>(3)</a>, <a href="../man3/rsa.html"><i>rsa</i>(3)</a>, <a href="../man3/sechash.html"><i>sechash</i>(3)</a>,
<a href="../man3/prime.html"><i>prime</i>(3)</a>, <a href="../man3/rand.html"><i>rand</i>(3)</a><br>
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