dsa man page on Plan9

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DSA(2)									DSA(2)

       dsagen,	dsasign,  dsaverify,  dsapuballoc,  dsapubfree,	 dsaprivalloc,
       dsaprivfree, dsasigalloc, dsasigfree, dsaprivtopub - digital  signature

       #include <u.h>
       #include <libc.h>
       #include <mp.h>
       #include <libsec.h>

       DSApriv*	 dsagen(DSApub *opub)

       DSAsig*	 dsasign(DSApriv *k, mpint *m)

       int	 dsaverify(DSApub *k, DSAsig *sig, mpint *m)

       DSApub*	 dsapuballoc(void)

       void	 dsapubfree(DSApub*)

       DSApriv*	 dsaprivalloc(void)

       void	 dsaprivfree(DSApriv*)

       DSAsig*	 dsasigalloc(void)

       void	 dsasigfree(DSAsig*)

       DSApub*	 dsaprivtopub(DSApriv*)

       DSA  is	the NIST approved digital signature algorithm.	The owner of a
       key publishes the public part of the key:

	      struct DSApub
		   mpint     *p;  // modulus
		   mpint     *q;  // group order, q divides p-1
		   mpint     *alpha;   // group generator
		   mpint     *key;     // alpha**secret mod p

       This part can be used for verifying signatures (with dsaverify) created
       by the owner.  The owner signs (with dsasign) using his private key:

	      struct DSApriv
		   DSApub    pub;
		   mpint     *secret; // (decryption key)

       Keys  are  generated using dsagen.  If dsagen's argument opub is nil, a
       key is created using  a	new  p	and  q	generated  by  DSAprimes  (see
       prime(2)).  Otherwise, p and q are copied from the old key.

       Dsaprivtopub  returns  a	 newly allocated copy of the public key corre‐
       sponding to the private key.

       The routines dsapuballoc, dsapubfree, dsaprivalloc, and dsaprivfree are
       provided to manage key storage.

       Dsasign signs message m using a private key k yielding a

	      struct DSAsig
		   mpint     *r, *s;

       Dsaverify returns 0 if the signature is valid and -1 if not.

       The  routines  dsasigalloc and dsasigfree are provided to manage signa‐
       ture storage.


       mp(2),  aes(2),	blowfish(2),  des(2),  rc4(2),	 rsa(2),   sechash(2),
       prime(2), rand(2), dsa(8)

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