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changed return type of ntru_decrypt, implemented second starmultiply,

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fixed numerical operations to mp_operations
This commit is contained in:
Christoph Prüßner 2014-05-03 16:02:09 +02:00
parent fa97531eac
commit 5254cf93f3
2 changed files with 15 additions and 9 deletions
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15
src/ntru_decrypt.c
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@ -37,8 +37,7 @@
* */
// Require: N , q, p, secret key f , inverse polynomial Fp , and encrypted message e.
int ntru_decrypt(pb_poly *encr_msg, pb_poly *private_key, ntru_context *context, char ** decr_msg){
// toDo fp = ?
pb_poly* ntru_decrypt(pb_poly *encr_msg, pb_poly *private_key, pb_poly *Fp, ntru_context *context, char ** decr_msg){
unsigned int q = context->q;
unsigned int p = context->p;
@ -62,13 +61,19 @@ int ntru_decrypt(pb_poly *encr_msg, pb_poly *private_key, ntru_context *context,
for(int i = 0, i < N, i++){
if(mp_cmp(&(a->terms[i]),&zero) == MP_LT) { // Make all coefficients positive
a->terms[i] = a->terms[i] + q;
//a->terms[i] = a->terms[i] + q;
mp_add((&a->terms[i]),&mp_q,(&a->terms[i]));
}
if(mp_cmp(&(a->terms[i]), &mp_qdiv2) == MP_GT) { // Shift coefficients of a into range (−q/2, q/2)
a->terms[i] = a->terms[i] - mp_q;
//a->terms[i] = a->terms[i] - mp_q;
mp_sub((&a->terms[i]),&mp_q,(&a->terms[i]));
}
}
//toDo StarMultiply(a, Fp , d, N, p)
pb_poly *d = build_polynom(NULL, N, context);
// StarMultiply(a, Fp , d, N, p)
pb_starmultiply(a, Fp, d, N, p);
// {Decode returns the decrypted message, d, through the argument list.}
return d;

9
src/ntru_decrypt.h
View File

@ -25,9 +25,10 @@
#include "poly.h"
#include "context.h"
int ntru_decrypt(pb_poly *encr_msg,
pb_poly *private_key,
ntru_context *context,
char ** decr_msg);
pb_poly* ntru_decrypt(pb_poly*,
pb_poly*,
pb_poly*,
ntru_context*,
char**);
#endif /* NTRU_DECRYPT */