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replace dh_import_radix() by dh_set_{pg,key}

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This commit is contained in:
Steffen Jaeckel 2017-06-27 21:53:02 +02:00
parent b3e535f933
commit fbc54756c1
4 changed files with 153 additions and 100 deletions
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15
src/headers/tomcrypt_pk.h
View File

@ -213,6 +213,8 @@ typedef struct {
void *prime;
} dh_key;
#define LTC_DH_KEY_INITIALIZER { PK_PUBLIC, NULL, NULL, NULL, NULL }
int dh_get_groupsize(dh_key *key);
int dh_make_key(prng_state *prng, int wprng, int groupsize, dh_key *key);
@ -226,14 +228,17 @@ void dh_free(dh_key *key);
int dh_export(unsigned char *out, unsigned long *outlen, int type, dh_key *key);
int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key);
int dh_set_pg(const unsigned char *p, unsigned long plen,
const unsigned char *g, unsigned long glen,
dh_key *key);
/* here we can support either one or both */
int dh_set_key(const unsigned char *pub, unsigned long publen,
const unsigned char *priv, unsigned long privlen,
dh_key *key);
int dh_export_radix(int radix,
void *out, unsigned long *outlen,
int type, dh_key *key);
int dh_import_radix(int radix,
void *in, unsigned long inlen,
void *prime, unsigned long primelen,
void *base, unsigned long baselen,
int type, dh_key *key);
int dh_shared_secret(dh_key *private_key, dh_key *public_key,
unsigned char *out, unsigned long *outlen);

90
src/pk/dh/dh_import_radix.c
View File

@ -1,90 +0,0 @@
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
#ifdef LTC_MDH
/**
Import a DH key from a binary string
@param in The string to read
@param inlen The length of the input packet
@param type The type of key (PK_PRIVATE or PK_PUBLIC)
@param base The base (generator) in hex string
@param prime The prime in hex string
@param key [out] Where to import the key to
@return CRYPT_OK if successful, on error all allocated memory is freed automatically
*/
int dh_import_radix(int radix,
void *in, unsigned long inlen,
void *prime, unsigned long primelen,
void *base, unsigned long baselen,
int type, dh_key *key)
{
int err;
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(base != NULL);
LTC_ARGCHK(prime != NULL);
LTC_ARGCHK(key != NULL);
if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
goto error;
}
if (radix == 256) {
if ((err = mp_read_unsigned_bin(key->base, base, baselen)) != CRYPT_OK) { goto error; }
if ((err = mp_read_unsigned_bin(key->prime, prime, primelen)) != CRYPT_OK) { goto error; }
}
else {
if ((err = mp_read_radix(key->base, base, radix)) != CRYPT_OK) { goto error; }
if ((err = mp_read_radix(key->prime, prime, radix)) != CRYPT_OK) { goto error; }
}
if (type == PK_PRIVATE) {
/* load the x value */
if (radix == 256) {
if ((err = mp_read_unsigned_bin(key->x, in, inlen)) != CRYPT_OK) { goto error; }
}
else {
if ((err = mp_read_radix(key->x, in, radix)) != CRYPT_OK) { goto error; }
}
/* compute y value */
if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto error; }
key->type = PK_PRIVATE;
}
else {
/* load the y value */
if (radix == 256) {
if ((err = mp_read_unsigned_bin(key->y, in, inlen)) != CRYPT_OK) { goto error; }
}
else {
if ((err = mp_read_radix(key->y, in, radix)) != CRYPT_OK) { goto error; }
}
key->type = PK_PUBLIC;
mp_clear(key->x);
key->x = NULL;
}
/* check public key */
if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
goto error;
}
return CRYPT_OK;
error:
mp_clear_multi(key->prime, key->base, key->y, key->x, NULL);
return err;
}
#endif /* LTC_MDH */
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */

110
src/pk/dh/dh_set.c Normal file
View File

@ -0,0 +1,110 @@
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*/
#include "tomcrypt.h"
#ifdef LTC_MDH
/**
Import DH key parts p and g from raw numbers
@param p DH's p (prime)
@param plen DH's p's length
@param g DH's g (group)
@param glen DH's g's length
@param key [out] the destination for the imported key
@return CRYPT_OK if successful
*/
int dh_set_pg(const unsigned char *p, unsigned long plen,
const unsigned char *g, unsigned long glen,
dh_key *key)
{
int err;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(key->x == NULL);
LTC_ARGCHK(key->y == NULL);
LTC_ARGCHK(key->base == NULL);
LTC_ARGCHK(key->prime == NULL);
LTC_ARGCHK(p != NULL);
LTC_ARGCHK(g != NULL);
LTC_ARGCHK(ltc_mp.name != NULL);
if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) {
return err;
}
if ((err = mp_read_unsigned_bin(key->base, (unsigned char*)g, glen)) != CRYPT_OK) { goto LBL_ERR; }
if ((err = mp_read_unsigned_bin(key->prime, (unsigned char*)p, plen)) != CRYPT_OK) { goto LBL_ERR; }
return CRYPT_OK;
LBL_ERR:
dh_free(key);
return err;
}
/**
Import DH key parts pub and priv from raw numbers
@param pub DH's pub (public key) (can be NULL if priv is valid)
@param publen DH's pub's length
@param priv DH's priv (private key) (can be NULL if pub is valid)
@param privlen DH's priv's length
@param key [out] the destination for the imported key
@return CRYPT_OK if successful
*/
int dh_set_key(const unsigned char *pub, unsigned long publen,
const unsigned char *priv, unsigned long privlen,
dh_key *key)
{
int err;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(key->x != NULL);
LTC_ARGCHK(key->y != NULL);
LTC_ARGCHK(key->base != NULL);
LTC_ARGCHK(key->prime != NULL);
LTC_ARGCHK(ltc_mp.name != NULL);
if(priv == NULL) {
if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)pub, publen)) != CRYPT_OK) { goto LBL_ERR; }
key->type = PK_PUBLIC;
mp_clear(key->x);
key->x = NULL;
}
else {
if ((err = mp_read_unsigned_bin(key->x, (unsigned char*)priv, privlen)) != CRYPT_OK) { goto LBL_ERR; }
if (pub != NULL) {
if ((err = mp_read_unsigned_bin(key->y, (unsigned char*)pub, publen)) != CRYPT_OK) { goto LBL_ERR; }
}
else {
/* compute y value */
if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto LBL_ERR; }
}
key->type = PK_PRIVATE;
}
/* check public key */
if ((err = dh_check_pubkey(key)) != CRYPT_OK) {
goto LBL_ERR;
}
return CRYPT_OK;
LBL_ERR:
dh_free(key);
return err;
}
#endif /* LTC_MDH */
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */

38
tests/dh_test.c
View File

@ -149,10 +149,12 @@ static int _dhparam_test(void)
static int _radix_test(void)
{
dh_key k1, k2, k3;
unsigned char buf[DH_BUF_SIZE];
dh_key k1 = LTC_DH_KEY_INITIALIZER;
dh_key k2 = LTC_DH_KEY_INITIALIZER;
dh_key k3 = LTC_DH_KEY_INITIALIZER;
unsigned char buf[4096];
unsigned long len;
int i;
int i, j;
/* RADIX 16 */
char *ghex = "2";
char *phex = "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B139B22"
@ -311,6 +313,8 @@ static int _radix_test(void)
0xF3, 0x7E, 0xE9, 0x0A, 0x0D, 0xA9, 0x5B, 0xE9, 0x6F, 0xC9, 0x39, 0xE8, 0x8F, 0xE0, 0xBD, 0x2C,
0xD0, 0x9F, 0xC8, 0xF5, 0x24, 0x20, 0x8C
};
unsigned char key_parts[4][512];
unsigned long key_lens[4];
if (register_prng(&yarrow_desc) == -1) {
printf("Error registering yarrow PRNG\n");
@ -318,7 +322,23 @@ static int _radix_test(void)
}
for (i = 0; i < 4; i++) {
DO(dh_import_radix(test[i].radix, test[i].x, test[i].xlen, test[i].p, test[i].plen, test[i].g, test[i].glen, PK_PRIVATE, &k1));
for (j = 0; j < 4; ++j) {
key_lens[j] = sizeof(key_parts[j]);
}
if(test[i].radix != 256) {
DO(radix_to_bin(test[i].x, test[i].radix, key_parts[0], &key_lens[0]));
DO(radix_to_bin(test[i].y, test[i].radix, key_parts[1], &key_lens[1]));
DO(radix_to_bin(test[i].p, test[i].radix, key_parts[2], &key_lens[2]));
DO(radix_to_bin(test[i].g, test[i].radix, key_parts[3], &key_lens[3]));
DO(dh_set_pg(key_parts[2], key_lens[2], key_parts[3], key_lens[3], &k1));
DO(dh_set_key(NULL, 0, key_parts[0], key_lens[0], &k1));
}
else {
DO(dh_set_pg(test[i].p, test[i].plen, test[i].g, test[i].glen, &k1));
DO(dh_set_key(NULL, 0, test[i].x, test[i].xlen, &k1));
}
len = sizeof(buf);
DO(dh_export(buf, &len, PK_PRIVATE, &k1));
if (compare_testvector(buf, len, export_private, sizeof(export_private), "radix_test", i*10 + 0)) {
@ -363,7 +383,15 @@ static int _radix_test(void)
}
dh_free(&k1);
DO(dh_import_radix(test[i].radix, test[i].y, test[i].ylen, test[i].p, test[i].plen, test[i].g, test[i].glen, PK_PUBLIC, &k2));
if(test[i].radix != 256) {
DO(dh_set_pg(key_parts[2], key_lens[2], key_parts[3], key_lens[3], &k2));
DO(dh_set_key(key_parts[1], key_lens[1], NULL, 0, &k2));
}
else {
DO(dh_set_pg(test[i].p, test[i].plen, test[i].g, test[i].glen, &k2));
DO(dh_set_key(test[i].y, test[i].ylen, NULL, 0, &k2));
}
len = sizeof(buf);
DO(dh_export(buf, &len, PK_PUBLIC, &k2));
if (compare_testvector(buf, len, export_public, sizeof(export_public), "radix_test", i*10 + 6)) {