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ENC: fix encryption

This commit is contained in:
hasufell 2014-05-25 00:58:34 +02:00
parent 1443b11fa8
commit 8fd5a6c829
No known key found for this signature in database
GPG Key ID: 220CD1C5BDEED020
2 changed files with 10 additions and 22 deletions
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27
src/encrypt.c
View File

@ -35,34 +35,21 @@
* m = the message poly
* q = large mod
*
* @param ctx ntru_context* the ntru context
* @param rnd pb_poly* the random poly
* @param msg pb_poly* the message to encrypt
* @param pubKey pb_poly* the public key
* @param rnd pb_poly* the random poly
* @param out pb_poly* the output poly [out]
* @param ctx ntru_context* the ntru context
*/
void ntru_encrypt_poly(fmpz_poly_t rnd,
void ntru_encrypt_poly(
fmpz_poly_t msg,
fmpz_poly_t pub_key,
fmpz_poly_t rnd,
fmpz_poly_t out,
ntru_context *ctx)
{
poly_starmultiply(pub_key, rnd, out, ctx, ctx->q);
fmpz_poly_zero(out);
for(unsigned int i = 0; i <= ctx->N - 1; i++) {
fmpz_poly_t tmp_poly;
fmpz_t tmp_coeff;
fmpz *e_coeff_i = fmpz_poly_get_coeff_ptr(out, i),
*m_coeff_i = fmpz_poly_get_coeff_ptr(msg, i);
fmpz_poly_init(tmp_poly);
fmpz_init(tmp_coeff);
fmpz_add_n(tmp_coeff, e_coeff_i, m_coeff_i);
fmpz_mod_ui(tmp_coeff, tmp_coeff, ctx->q);
fmpz_poly_set_coeff_fmpz(out, i, tmp_coeff);
}
poly_starmultiply(pub_key, rnd, out, ctx, ctx->q);
fmpz_poly_add(out, out, msg);
fmpz_poly_mod_unsigned(out, ctx->q);
}

5
src/encrypt.h
View File

@ -30,9 +30,10 @@
#include <fmpz.h>
void ntru_encrypt_poly(fmpz_poly_t rnd,
void ntru_encrypt_poly(
fmpz_poly_t msg,
fmpz_poly_t pubKey,
fmpz_poly_t pub_key,
fmpz_poly_t rnd,
fmpz_poly_t out,
ntru_context *ctx);