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*)

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 corresponding 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 signature storage.