XTR cryptosystem
ecesena@libero.it
ecesena at libero.it
Mon Feb 24 12:03:01 CET 2003
Hi!
I'm studying XTR cryptosystem (www.ecstr.com) for my thesis and I'd like to implement XTR support for GPG as an "exercise".
"XTR is not a new crypto system; it is just a particularly efficient and compact implementation of the classical Diffie-Hellman scheme", so with XTR we could rewrite everything: DH, ElGamal, DSA...
Well, let talk for instance about ElGamal... how to implement it? I'm looking the source (elgamal.h, .c)
For "induction", I think I need to write a file xtrelgamal.h as
--- start xtrelgamal.h ---
#ifndef G10_XTR_ELGAMAL_H
#define G10_XTR_ELGAMAL_H
int xtr_elg_generate( int algo, unsigned nbits, MPI *skey, MPI **retfactors );
int xtr_elg_check_secret_key( int algo, MPI *skey );
int xtr_elg_encrypt( int algo, MPI *resarr, MPI data, MPI *pkey );
int xtr_elg_decrypt( int algo, MPI *result, MPI *data, MPI *skey );
int xtr_elg_sign( int algo, MPI *resarr, MPI data, MPI *skey );
int xtr_elg_verify( int algo, MPI hash, MPI *data, MPI *pkey,
int (*cmp)(void *, MPI), void *opaquev );
unsigned xtr_elg_get_nbits( int algo, MPI *pkey );
const char *xtr_elg_get_info( int algo, int *npkey, int *nskey,
int *nenc, int *nsig, int *use );
#endif /*G10_XTR_ELGAMAL_H*/
--- end xtrelgamal.h ---
Then I'll implement the code in xtrelgamal.c...
but then?
Thanks. bye!
--
Emanuele Cesena
<ecesena at libero.it>
Il corpo non ha ideali
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