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RetroZilla/security/nss/lib/freebl/dh.c
Ryan Nematz 2f2ae146c0 first commit
2015-10-20 23:03:22 -04:00

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Diffie-Hellman parameter generation, key generation, and secret derivation.
* KEA secret generation and verification.
*
* $Id: dh.c,v 1.8 2008/11/18 19:48:22 rrelyea%redhat.com Exp $
*/
#ifdef FREEBL_NO_DEPEND
#include "stubs.h"
#endif
#include "prerr.h"
#include "secerr.h"
#include "blapi.h"
#include "secitem.h"
#include "mpi.h"
#include "mpprime.h"
#include "secmpi.h"
#define DH_SECRET_KEY_LEN 20
#define KEA_DERIVED_SECRET_LEN 128
SECStatus
DH_GenParam(int primeLen, DHParams **params)
{
PRArenaPool *arena;
DHParams *dhparams;
unsigned char *pb = NULL;
unsigned char *ab = NULL;
unsigned long counter = 0;
mp_int p, q, a, h, psub1, test;
mp_err err = MP_OKAY;
SECStatus rv = SECSuccess;
if (!params || primeLen < 0) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
arena = PORT_NewArena(NSS_FREEBL_DEFAULT_CHUNKSIZE);
if (!arena) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
return SECFailure;
}
dhparams = (DHParams *)PORT_ArenaZAlloc(arena, sizeof(DHParams));
if (!dhparams) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
}
dhparams->arena = arena;
MP_DIGITS(&p) = 0;
MP_DIGITS(&q) = 0;
MP_DIGITS(&a) = 0;
MP_DIGITS(&h) = 0;
MP_DIGITS(&psub1) = 0;
MP_DIGITS(&test) = 0;
CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&q) );
CHECK_MPI_OK( mp_init(&a) );
CHECK_MPI_OK( mp_init(&h) );
CHECK_MPI_OK( mp_init(&psub1) );
CHECK_MPI_OK( mp_init(&test) );
/* generate prime with MPI, uses Miller-Rabin to generate strong prime. */
pb = PORT_Alloc(primeLen);
CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(pb, primeLen) );
pb[0] |= 0x80; /* set high-order bit */
pb[primeLen-1] |= 0x01; /* set low-order bit */
CHECK_MPI_OK( mp_read_unsigned_octets(&p, pb, primeLen) );
CHECK_MPI_OK( mpp_make_prime(&p, primeLen * 8, PR_TRUE, &counter) );
/* construct Sophie-Germain prime q = (p-1)/2. */
CHECK_MPI_OK( mp_sub_d(&p, 1, &psub1) );
CHECK_MPI_OK( mp_div_2(&psub1, &q) );
/* construct a generator from the prime. */
ab = PORT_Alloc(primeLen);
/* generate a candidate number a in p's field */
CHECK_SEC_OK( RNG_GenerateGlobalRandomBytes(ab, primeLen) );
CHECK_MPI_OK( mp_read_unsigned_octets(&a, ab, primeLen) );
/* force a < p (note that quot(a/p) <= 1) */
if ( mp_cmp(&a, &p) > 0 )
CHECK_MPI_OK( mp_sub(&a, &p, &a) );
do {
/* check that a is in the range [2..p-1] */
if ( mp_cmp_d(&a, 2) < 0 || mp_cmp(&a, &psub1) >= 0) {
/* a is outside of the allowed range. Set a=3 and keep going. */
mp_set(&a, 3);
}
/* if a**q mod p != 1 then a is a generator */
CHECK_MPI_OK( mp_exptmod(&a, &q, &p, &test) );
if ( mp_cmp_d(&test, 1) != 0 )
break;
/* increment the candidate and try again. */
CHECK_MPI_OK( mp_add_d(&a, 1, &a) );
} while (PR_TRUE);
MPINT_TO_SECITEM(&p, &dhparams->prime, arena);
MPINT_TO_SECITEM(&a, &dhparams->base, arena);
*params = dhparams;
cleanup:
mp_clear(&p);
mp_clear(&q);
mp_clear(&a);
mp_clear(&h);
mp_clear(&psub1);
mp_clear(&test);
if (pb) PORT_ZFree(pb, primeLen);
if (ab) PORT_ZFree(ab, primeLen);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
if (rv)
PORT_FreeArena(arena, PR_TRUE);
return rv;
}
SECStatus
DH_NewKey(DHParams *params, DHPrivateKey **privKey)
{
PRArenaPool *arena;
DHPrivateKey *key;
mp_int g, xa, p, Ya;
mp_err err = MP_OKAY;
SECStatus rv = SECSuccess;
if (!params || !privKey) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
arena = PORT_NewArena(NSS_FREEBL_DEFAULT_CHUNKSIZE);
if (!arena) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
return SECFailure;
}
key = (DHPrivateKey *)PORT_ArenaZAlloc(arena, sizeof(DHPrivateKey));
if (!key) {
PORT_SetError(SEC_ERROR_NO_MEMORY);
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
}
key->arena = arena;
MP_DIGITS(&g) = 0;
MP_DIGITS(&xa) = 0;
MP_DIGITS(&p) = 0;
MP_DIGITS(&Ya) = 0;
CHECK_MPI_OK( mp_init(&g) );
CHECK_MPI_OK( mp_init(&xa) );
CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&Ya) );
/* Set private key's p */
CHECK_SEC_OK( SECITEM_CopyItem(arena, &key->prime, &params->prime) );
SECITEM_TO_MPINT(key->prime, &p);
/* Set private key's g */
CHECK_SEC_OK( SECITEM_CopyItem(arena, &key->base, &params->base) );
SECITEM_TO_MPINT(key->base, &g);
/* Generate private key xa */
SECITEM_AllocItem(arena, &key->privateValue, DH_SECRET_KEY_LEN);
RNG_GenerateGlobalRandomBytes(key->privateValue.data,
key->privateValue.len);
SECITEM_TO_MPINT( key->privateValue, &xa );
/* xa < p */
CHECK_MPI_OK( mp_mod(&xa, &p, &xa) );
/* Compute public key Ya = g ** xa mod p */
CHECK_MPI_OK( mp_exptmod(&g, &xa, &p, &Ya) );
MPINT_TO_SECITEM(&Ya, &key->publicValue, key->arena);
*privKey = key;
cleanup:
mp_clear(&g);
mp_clear(&xa);
mp_clear(&p);
mp_clear(&Ya);
if (err) {
MP_TO_SEC_ERROR(err);
rv = SECFailure;
}
if (rv)
PORT_FreeArena(arena, PR_TRUE);
return rv;
}
SECStatus
DH_Derive(SECItem *publicValue,
SECItem *prime,
SECItem *privateValue,
SECItem *derivedSecret,
unsigned int maxOutBytes)
{
mp_int p, Xa, Yb, ZZ;
mp_err err = MP_OKAY;
unsigned int len = 0, nb;
unsigned char *secret = NULL;
if (!publicValue || !prime || !privateValue || !derivedSecret) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
memset(derivedSecret, 0, sizeof *derivedSecret);
MP_DIGITS(&p) = 0;
MP_DIGITS(&Xa) = 0;
MP_DIGITS(&Yb) = 0;
MP_DIGITS(&ZZ) = 0;
CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&Xa) );
CHECK_MPI_OK( mp_init(&Yb) );
CHECK_MPI_OK( mp_init(&ZZ) );
SECITEM_TO_MPINT(*publicValue, &Yb);
SECITEM_TO_MPINT(*privateValue, &Xa);
SECITEM_TO_MPINT(*prime, &p);
/* ZZ = (Yb)**Xa mod p */
CHECK_MPI_OK( mp_exptmod(&Yb, &Xa, &p, &ZZ) );
/* number of bytes in the derived secret */
len = mp_unsigned_octet_size(&ZZ);
/* allocate a buffer which can hold the entire derived secret. */
secret = PORT_Alloc(len);
/* grab the derived secret */
err = mp_to_unsigned_octets(&ZZ, secret, len);
if (err >= 0) err = MP_OKAY;
/* Take minimum of bytes requested and bytes in derived secret,
** if maxOutBytes is 0 take all of the bytes from the derived secret.
*/
if (maxOutBytes > 0)
nb = PR_MIN(len, maxOutBytes);
else
nb = len;
SECITEM_AllocItem(NULL, derivedSecret, nb);
memcpy(derivedSecret->data, secret, nb);
cleanup:
mp_clear(&p);
mp_clear(&Xa);
mp_clear(&Yb);
mp_clear(&ZZ);
if (secret) {
/* free the buffer allocated for the full secret. */
PORT_ZFree(secret, len);
}
if (err) {
MP_TO_SEC_ERROR(err);
if (derivedSecret->data)
PORT_ZFree(derivedSecret->data, derivedSecret->len);
return SECFailure;
}
return SECSuccess;
}
SECStatus
KEA_Derive(SECItem *prime,
SECItem *public1,
SECItem *public2,
SECItem *private1,
SECItem *private2,
SECItem *derivedSecret)
{
mp_int p, Y, R, r, x, t, u, w;
mp_err err;
unsigned char *secret = NULL;
unsigned int len = 0, offset;
if (!prime || !public1 || !public2 || !private1 || !private2 ||
!derivedSecret) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
memset(derivedSecret, 0, sizeof *derivedSecret);
MP_DIGITS(&p) = 0;
MP_DIGITS(&Y) = 0;
MP_DIGITS(&R) = 0;
MP_DIGITS(&r) = 0;
MP_DIGITS(&x) = 0;
MP_DIGITS(&t) = 0;
MP_DIGITS(&u) = 0;
MP_DIGITS(&w) = 0;
CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&Y) );
CHECK_MPI_OK( mp_init(&R) );
CHECK_MPI_OK( mp_init(&r) );
CHECK_MPI_OK( mp_init(&x) );
CHECK_MPI_OK( mp_init(&t) );
CHECK_MPI_OK( mp_init(&u) );
CHECK_MPI_OK( mp_init(&w) );
SECITEM_TO_MPINT(*prime, &p);
SECITEM_TO_MPINT(*public1, &Y);
SECITEM_TO_MPINT(*public2, &R);
SECITEM_TO_MPINT(*private1, &r);
SECITEM_TO_MPINT(*private2, &x);
/* t = DH(Y, r, p) = Y ** r mod p */
CHECK_MPI_OK( mp_exptmod(&Y, &r, &p, &t) );
/* u = DH(R, x, p) = R ** x mod p */
CHECK_MPI_OK( mp_exptmod(&R, &x, &p, &u) );
/* w = (t + u) mod p */
CHECK_MPI_OK( mp_addmod(&t, &u, &p, &w) );
/* allocate a buffer for the full derived secret */
len = mp_unsigned_octet_size(&w);
secret = PORT_Alloc(len);
/* grab the secret */
err = mp_to_unsigned_octets(&w, secret, len);
if (err > 0) err = MP_OKAY;
/* allocate output buffer */
SECITEM_AllocItem(NULL, derivedSecret, KEA_DERIVED_SECRET_LEN);
memset(derivedSecret->data, 0, derivedSecret->len);
/* copy in the 128 lsb of the secret */
if (len >= KEA_DERIVED_SECRET_LEN) {
memcpy(derivedSecret->data, secret + (len - KEA_DERIVED_SECRET_LEN),
KEA_DERIVED_SECRET_LEN);
} else {
offset = KEA_DERIVED_SECRET_LEN - len;
memcpy(derivedSecret->data + offset, secret, len);
}
cleanup:
mp_clear(&p);
mp_clear(&Y);
mp_clear(&R);
mp_clear(&r);
mp_clear(&x);
mp_clear(&t);
mp_clear(&u);
mp_clear(&w);
if (secret)
PORT_ZFree(secret, len);
if (err) {
MP_TO_SEC_ERROR(err);
return SECFailure;
}
return SECSuccess;
}
PRBool
KEA_Verify(SECItem *Y, SECItem *prime, SECItem *subPrime)
{
mp_int p, q, y, r;
mp_err err;
int cmp = 1; /* default is false */
if (!Y || !prime || !subPrime) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
MP_DIGITS(&p) = 0;
MP_DIGITS(&q) = 0;
MP_DIGITS(&y) = 0;
MP_DIGITS(&r) = 0;
CHECK_MPI_OK( mp_init(&p) );
CHECK_MPI_OK( mp_init(&q) );
CHECK_MPI_OK( mp_init(&y) );
CHECK_MPI_OK( mp_init(&r) );
SECITEM_TO_MPINT(*prime, &p);
SECITEM_TO_MPINT(*subPrime, &q);
SECITEM_TO_MPINT(*Y, &y);
/* compute r = y**q mod p */
CHECK_MPI_OK( mp_exptmod(&y, &q, &p, &r) );
/* compare to 1 */
cmp = mp_cmp_d(&r, 1);
cleanup:
mp_clear(&p);
mp_clear(&q);
mp_clear(&y);
mp_clear(&r);
if (err) {
MP_TO_SEC_ERROR(err);
return PR_FALSE;
}
return (cmp == 0) ? PR_TRUE : PR_FALSE;
}
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