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KEYGEN: support import/export of keys

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hasufell 2014-05-30 19:23:45 +02:00
parent a42b65505a
commit 8871b496c2
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GPG Key ID: 220CD1C5BDEED020
2 changed files with 154 additions and 0 deletions
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104
src/keypair.c
View File

@ -26,14 +26,18 @@
* @brief key creation and operations
*/
#include "ascii_poly.h"
#include "context.h"
#include "file.h"
#include "keypair.h"
#include "ntru_string.h"
#include "poly.h"
#include <fmpz_poly.h>
#include <fmpz.h>
#include <stdbool.h>
#include <string.h>
/*------------------------------------------------------------------------*/
@ -87,6 +91,106 @@ _return:
/*------------------------------------------------------------------------*/
void
export_public_key(char const * const filename,
fmpz_poly_t pub,
ntru_context *ctx)
{
string *pub_string;
pub_string = poly_to_base64(pub, ctx);
write_file(pub_string, filename);
string_delete(pub_string);
}
/*------------------------------------------------------------------------*/
void
export_priv_key(char const * const filename,
fmpz_poly_t priv,
ntru_context *ctx)
{
string *priv_string;
fmpz_poly_t priv_u;
fmpz_poly_init(priv_u);
fmpz_poly_set(priv_u, priv);
fmpz_poly_mod_unsigned(priv_u, ctx->p);
priv_string = poly_to_base64(priv_u, ctx);
write_file(priv_string, filename);
string_delete(priv_string);
}
/*------------------------------------------------------------------------*/
void
import_public_key(char const * const filename,
fmpz_poly_t pub,
ntru_context *ctx)
{
string *pub_string;
fmpz_poly_t **imported;
pub_string = read_file(filename);
imported = base64_to_poly_arr(pub_string, ctx);
/* if the array exceeds one element, then something
* went horribly wrong */
if (*imported[1])
NTRU_ABORT("Failed importing public key!\n");
fmpz_poly_set(pub, **imported);
string_delete(pub_string);
poly_delete(**imported);
free(imported);
}
/*------------------------------------------------------------------------*/
void
import_priv_key(char const * const filename,
fmpz_poly_t priv,
fmpz_poly_t priv_inv,
ntru_context *ctx)
{
string *pub_string;
fmpz_poly_t **imported,
Fp;
fmpz_poly_init(Fp);
pub_string = read_file(filename);
imported = base64_to_poly_arr(pub_string, ctx);
fmpz_poly_mod(**imported, ctx->p);
/* if the array exceeds one element, then something
* went horribly wrong */
if (*imported[1])
NTRU_ABORT("Failed importing public key!\n");
fmpz_poly_set(priv, **imported);
if (!poly_inverse_poly_p(priv, Fp, ctx))
goto cleanup;
fmpz_poly_mod(Fp, ctx->p);
fmpz_poly_set(priv_inv, Fp);
fmpz_poly_clear(Fp);
cleanup:
string_delete(pub_string);
poly_delete(**imported);
free(imported);
}
/*------------------------------------------------------------------------*/
void
ntru_delete_keypair(keypair *pair)
{

50
src/keypair.h
View File

@ -79,6 +79,56 @@ ntru_create_keypair(
keypair *pair,
ntru_context *ctx);
/**
* Export the public key to a file.
*
* @param filename the file to save the public key into
* @param pub the public key
* @param ctx the NTRU context
*/
void
export_public_key(char const * const filename,
fmpz_poly_t pub,
ntru_context *ctx);
/**
* Export the private key to a file.
*
* @param filename the file to save the private key into
* @param priv the private key
* @param ctx the NTRU context
*/
void
export_priv_key(char const * const filename,
fmpz_poly_t priv,
ntru_context *ctx);
/**
* Import the public key from a file.
* @param filename the file to get the public key from
* @param pub where to save the public key [out]
* @param ctx the NTRU context
*/
void
import_public_key(char const * const filename,
fmpz_poly_t pub,
ntru_context *ctx);
/**
* Import the private key from a file and store him
* along with his inverse.
*
* @param filename the file to get the private key from
* @param priv where to save the private key [out]
* @param priv_inv where to save the inverse of the private key [out]
* @param ctx the NTRU context
*/
void
import_priv_key(char const * const filename,
fmpz_poly_t priv,
fmpz_poly_t priv_inv,
ntru_context *ctx);
/**
* Used to free the inner structure
* of a keypair. This will not call free()