RetroZilla/security/nss/lib/softoken/ecdecode.c

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2015-10-21 05:03:22 +02:00
/*
* ***** 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 Elliptic Curve Cryptography library.
*
* The Initial Developer of the Original Code is
* Sun Microsystems, Inc.
* Portions created by the Initial Developer are Copyright (C) 2003
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dr Vipul Gupta <vipul.gupta@sun.com> and
* Douglas Stebila <douglas@stebila.ca>, Sun Microsystems Laboratories
*
* 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 ***** */
#ifdef NSS_ENABLE_ECC
#include "blapi.h"
#include "secoid.h"
#include "secitem.h"
#include "secerr.h"
#include "ec.h"
#include "ecl-curve.h"
#define CHECK_OK(func) if (func == NULL) goto cleanup
#define CHECK_SEC_OK(func) if (SECSuccess != (rv = func)) goto cleanup
/*
* Initializes a SECItem from a hexadecimal string
*
* Warning: This function ignores leading 00's, so any leading 00's
* in the hexadecimal string must be optional.
*/
static SECItem *
hexString2SECItem(PRArenaPool *arena, SECItem *item, const char *str)
{
int i = 0;
int byteval = 0;
int tmp = PORT_Strlen(str);
if ((tmp % 2) != 0) return NULL;
/* skip leading 00's unless the hex string is "00" */
while ((tmp > 2) && (str[0] == '0') && (str[1] == '0')) {
str += 2;
tmp -= 2;
}
item->data = (unsigned char *) PORT_ArenaAlloc(arena, tmp/2);
if (item->data == NULL) return NULL;
item->len = tmp/2;
while (str[i]) {
if ((str[i] >= '0') && (str[i] <= '9'))
tmp = str[i] - '0';
else if ((str[i] >= 'a') && (str[i] <= 'f'))
tmp = str[i] - 'a' + 10;
else if ((str[i] >= 'A') && (str[i] <= 'F'))
tmp = str[i] - 'A' + 10;
else
return NULL;
byteval = byteval * 16 + tmp;
if ((i % 2) != 0) {
item->data[i/2] = byteval;
byteval = 0;
}
i++;
}
return item;
}
/* Copy all of the fields from srcParams into dstParams
*/
SECStatus
EC_CopyParams(PRArenaPool *arena, ECParams *dstParams,
const ECParams *srcParams)
{
SECStatus rv = SECFailure;
dstParams->arena = arena;
dstParams->type = srcParams->type;
dstParams->fieldID.size = srcParams->fieldID.size;
dstParams->fieldID.type = srcParams->fieldID.type;
if (srcParams->fieldID.type == ec_field_GFp) {
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->fieldID.u.prime,
&srcParams->fieldID.u.prime));
} else {
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->fieldID.u.poly,
&srcParams->fieldID.u.poly));
}
dstParams->fieldID.k1 = srcParams->fieldID.k1;
dstParams->fieldID.k2 = srcParams->fieldID.k2;
dstParams->fieldID.k3 = srcParams->fieldID.k3;
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.a,
&srcParams->curve.a));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.b,
&srcParams->curve.b));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curve.seed,
&srcParams->curve.seed));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->base,
&srcParams->base));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->order,
&srcParams->order));
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->DEREncoding,
&srcParams->DEREncoding));
dstParams->name = srcParams->name;
CHECK_SEC_OK(SECITEM_CopyItem(arena, &dstParams->curveOID,
&srcParams->curveOID));
dstParams->cofactor = srcParams->cofactor;
return SECSuccess;
cleanup:
return SECFailure;
}
static SECStatus
gf_populate_params(ECCurveName name, ECFieldType field_type, ECParams *params)
{
SECStatus rv = SECFailure;
const ECCurveParams *curveParams;
/* 2 ['0'+'4'] + MAX_ECKEY_LEN * 2 [x,y] * 2 [hex string] + 1 ['\0'] */
char genenc[3 + 2 * 2 * MAX_ECKEY_LEN];
if ((name < ECCurve_noName) || (name > ECCurve_pastLastCurve)) goto cleanup;
params->name = name;
curveParams = ecCurve_map[params->name];
CHECK_OK(curveParams);
params->fieldID.size = curveParams->size;
params->fieldID.type = field_type;
if (field_type == ec_field_GFp) {
CHECK_OK(hexString2SECItem(params->arena, &params->fieldID.u.prime,
curveParams->irr));
} else {
CHECK_OK(hexString2SECItem(params->arena, &params->fieldID.u.poly,
curveParams->irr));
}
CHECK_OK(hexString2SECItem(params->arena, &params->curve.a,
curveParams->curvea));
CHECK_OK(hexString2SECItem(params->arena, &params->curve.b,
curveParams->curveb));
genenc[0] = '0';
genenc[1] = '4';
genenc[2] = '\0';
strcat(genenc, curveParams->genx);
strcat(genenc, curveParams->geny);
CHECK_OK(hexString2SECItem(params->arena, &params->base, genenc));
CHECK_OK(hexString2SECItem(params->arena, &params->order,
curveParams->order));
params->cofactor = curveParams->cofactor;
rv = SECSuccess;
cleanup:
return rv;
}
SECStatus
EC_FillParams(PRArenaPool *arena, const SECItem *encodedParams,
ECParams *params)
{
SECStatus rv = SECFailure;
SECOidTag tag;
SECItem oid = { siBuffer, NULL, 0};
#if EC_DEBUG
int i;
printf("Encoded params in EC_DecodeParams: ");
for (i = 0; i < encodedParams->len; i++) {
printf("%02x:", encodedParams->data[i]);
}
printf("\n");
#endif
if ((encodedParams->len != ANSI_X962_CURVE_OID_TOTAL_LEN) &&
(encodedParams->len != SECG_CURVE_OID_TOTAL_LEN)) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
return SECFailure;
};
oid.len = encodedParams->len - 2;
oid.data = encodedParams->data + 2;
if ((encodedParams->data[0] != SEC_ASN1_OBJECT_ID) ||
((tag = SECOID_FindOIDTag(&oid)) == SEC_OID_UNKNOWN)) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
return SECFailure;
}
params->arena = arena;
params->cofactor = 0;
params->type = ec_params_named;
params->name = ECCurve_noName;
/* For named curves, fill out curveOID */
params->curveOID.len = oid.len;
params->curveOID.data = (unsigned char *) PORT_ArenaAlloc(arena, oid.len);
if (params->curveOID.data == NULL) goto cleanup;
memcpy(params->curveOID.data, oid.data, oid.len);
#if EC_DEBUG
printf("Curve: %s\n", SECOID_FindOIDTagDescription(tag));
#endif
switch (tag) {
/* Binary curves */
case SEC_OID_ANSIX962_EC_C2PNB163V1:
/* Populate params for c2pnb163v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB163V1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB163V2:
/* Populate params for c2pnb163v2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB163V2, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB163V3:
/* Populate params for c2pnb163v3 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB163V3, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB176V1:
/* Populate params for c2pnb176v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB176V1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB191V1:
/* Populate params for c2tnb191v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB191V1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB191V2:
/* Populate params for c2tnb191v2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB191V2, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB191V3:
/* Populate params for c2tnb191v3 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB191V3, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB208W1:
/* Populate params for c2pnb208w1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB208W1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB239V1:
/* Populate params for c2tnb239v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB239V1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB239V2:
/* Populate params for c2tnb239v2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB239V2, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB239V3:
/* Populate params for c2tnb239v3 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB239V3, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB272W1:
/* Populate params for c2pnb272w1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB272W1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB304W1:
/* Populate params for c2pnb304w1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB304W1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB359V1:
/* Populate params for c2tnb359v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB359V1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2PNB368W1:
/* Populate params for c2pnb368w1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_PNB368W1, ec_field_GF2m,
params) );
break;
case SEC_OID_ANSIX962_EC_C2TNB431R1:
/* Populate params for c2tnb431r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_CHAR2_TNB431R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT113R1:
/* Populate params for sect113r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_113R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT113R2:
/* Populate params for sect113r2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_113R2, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT131R1:
/* Populate params for sect131r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_131R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT131R2:
/* Populate params for sect131r2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_131R2, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT163K1:
/* Populate params for sect163k1
* (the NIST K-163 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_163K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT163R1:
/* Populate params for sect163r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_163R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT163R2:
/* Populate params for sect163r2
* (the NIST B-163 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_163R2, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT193R1:
/* Populate params for sect193r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_193R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT193R2:
/* Populate params for sect193r2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_193R2, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT233K1:
/* Populate params for sect233k1
* (the NIST K-233 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_233K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT233R1:
/* Populate params for sect233r1
* (the NIST B-233 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_233R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT239K1:
/* Populate params for sect239k1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_239K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT283K1:
/* Populate params for sect283k1
* (the NIST K-283 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_283K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT283R1:
/* Populate params for sect283r1
* (the NIST B-283 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_283R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT409K1:
/* Populate params for sect409k1
* (the NIST K-409 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_409K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT409R1:
/* Populate params for sect409r1
* (the NIST B-409 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_409R1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT571K1:
/* Populate params for sect571k1
* (the NIST K-571 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_571K1, ec_field_GF2m,
params) );
break;
case SEC_OID_SECG_EC_SECT571R1:
/* Populate params for sect571r1
* (the NIST B-571 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_CHAR2_571R1, ec_field_GF2m,
params) );
break;
/* Prime curves */
case SEC_OID_ANSIX962_EC_PRIME192V1:
/* Populate params for prime192v1 aka secp192r1
* (the NIST P-192 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_192V1, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME192V2:
/* Populate params for prime192v2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_192V2, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME192V3:
/* Populate params for prime192v3 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_192V3, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME239V1:
/* Populate params for prime239v1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_239V1, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME239V2:
/* Populate params for prime239v2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_239V2, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME239V3:
/* Populate params for prime239v3 */
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_239V3, ec_field_GFp,
params) );
break;
case SEC_OID_ANSIX962_EC_PRIME256V1:
/* Populate params for prime256v1 aka secp256r1
* (the NIST P-256 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_X9_62_PRIME_256V1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP112R1:
/* Populate params for secp112r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_112R1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP112R2:
/* Populate params for secp112r2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_112R2, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP128R1:
/* Populate params for secp128r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_128R1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP128R2:
/* Populate params for secp128r2 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_128R2, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP160K1:
/* Populate params for secp160k1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_160K1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP160R1:
/* Populate params for secp160r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_160R1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP160R2:
/* Populate params for secp160r1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_160R2, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP192K1:
/* Populate params for secp192k1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_192K1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP224K1:
/* Populate params for secp224k1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_224K1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP224R1:
/* Populate params for secp224r1
* (the NIST P-224 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_224R1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP256K1:
/* Populate params for secp256k1 */
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_256K1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP384R1:
/* Populate params for secp384r1
* (the NIST P-384 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_384R1, ec_field_GFp,
params) );
break;
case SEC_OID_SECG_EC_SECP521R1:
/* Populate params for secp521r1
* (the NIST P-521 curve)
*/
CHECK_SEC_OK( gf_populate_params(ECCurve_SECG_PRIME_521R1, ec_field_GFp,
params) );
break;
default:
break;
};
cleanup:
if (!params->cofactor) {
PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
#if EC_DEBUG
printf("Unrecognized curve, returning NULL params\n");
#endif
}
return rv;
}
SECStatus
EC_DecodeParams(const SECItem *encodedParams, ECParams **ecparams)
{
PRArenaPool *arena;
ECParams *params;
SECStatus rv = SECFailure;
/* Initialize an arena for the ECParams structure */
if (!(arena = PORT_NewArena(NSS_FREEBL_DEFAULT_CHUNKSIZE)))
return SECFailure;
params = (ECParams *)PORT_ArenaZAlloc(arena, sizeof(ECParams));
if (!params) {
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
}
/* Copy the encoded params */
SECITEM_AllocItem(arena, &(params->DEREncoding),
encodedParams->len);
memcpy(params->DEREncoding.data, encodedParams->data, encodedParams->len);
/* Fill out the rest of the ECParams structure based on
* the encoded params
*/
rv = EC_FillParams(arena, encodedParams, params);
if (rv == SECFailure) {
PORT_FreeArena(arena, PR_TRUE);
return SECFailure;
} else {
*ecparams = params;;
return SECSuccess;
}
}
#endif /* NSS_ENABLE_ECC */