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489 lines
12 KiB
C
489 lines
12 KiB
C
/*
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* Signature stuff.
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Dr Vipul Gupta <vipul.gupta@sun.com>, Sun Microsystems Laboratories
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* $Id: secsign.c,v 1.18 2006/06/23 17:01:37 rrelyea%redhat.com Exp $ */
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#include <stdio.h>
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#include "cryptohi.h"
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#include "sechash.h"
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#include "secder.h"
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#include "keyhi.h"
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#include "secoid.h"
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#include "secdig.h"
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#include "pk11func.h"
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#include "secerr.h"
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#include "keyi.h"
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struct SGNContextStr {
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SECOidTag signalg;
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SECOidTag hashalg;
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void *hashcx;
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const SECHashObject *hashobj;
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SECKEYPrivateKey *key;
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};
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SGNContext *
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SGN_NewContext(SECOidTag alg, SECKEYPrivateKey *key)
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{
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SGNContext *cx;
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SECOidTag hashalg, signalg;
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KeyType keyType;
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SECStatus rv;
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/* OK, map a PKCS #7 hash and encrypt algorithm into
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* a standard hashing algorithm. Why did we pass in the whole
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* PKCS #7 algTag if we were just going to change here you might
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* ask. Well the answer is for some cards we may have to do the
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* hashing on card. It may not support CKM_RSA_PKCS sign algorithm,
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* it may just support CKM_RSA_PKCS_WITH_SHA1 and/or CKM_RSA_PKCS_WITH_MD5.
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*/
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/* we have a private key, not a public key, so don't pass it in */
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rv = sec_DecodeSigAlg(NULL, alg, NULL, &signalg, &hashalg);
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if (rv != SECSuccess) {
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PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
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return 0;
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}
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keyType = seckey_GetKeyType(signalg);
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/* verify our key type */
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if (key->keyType != keyType &&
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!((key->keyType == dsaKey) && (keyType == fortezzaKey)) &&
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!((key->keyType == fortezzaKey) && (keyType == dsaKey)) ) {
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PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
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return 0;
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}
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#ifndef NSS_ECC_MORE_THAN_SUITE_B
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if (key->keyType == ecKey) {
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PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
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return 0;
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}
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#endif
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cx = (SGNContext*) PORT_ZAlloc(sizeof(SGNContext));
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if (cx) {
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cx->hashalg = hashalg;
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cx->signalg = signalg;
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cx->key = key;
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}
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return cx;
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}
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void
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SGN_DestroyContext(SGNContext *cx, PRBool freeit)
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{
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if (cx) {
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if (cx->hashcx != NULL) {
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(*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
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cx->hashcx = NULL;
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}
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if (freeit) {
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PORT_ZFree(cx, sizeof(SGNContext));
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}
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}
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}
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SECStatus
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SGN_Begin(SGNContext *cx)
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{
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if (cx->hashcx != NULL) {
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(*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
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cx->hashcx = NULL;
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}
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cx->hashobj = HASH_GetHashObjectByOidTag(cx->hashalg);
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if (!cx->hashobj)
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return SECFailure; /* error code is already set */
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cx->hashcx = (*cx->hashobj->create)();
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if (cx->hashcx == NULL)
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return SECFailure;
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(*cx->hashobj->begin)(cx->hashcx);
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return SECSuccess;
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}
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SECStatus
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SGN_Update(SGNContext *cx, unsigned char *input, unsigned inputLen)
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{
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if (cx->hashcx == NULL) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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(*cx->hashobj->update)(cx->hashcx, input, inputLen);
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return SECSuccess;
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}
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SECStatus
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SGN_End(SGNContext *cx, SECItem *result)
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{
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unsigned char digest[HASH_LENGTH_MAX];
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unsigned part1;
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int signatureLen;
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SECStatus rv;
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SECItem digder, sigitem;
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PRArenaPool *arena = 0;
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SECKEYPrivateKey *privKey = cx->key;
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SGNDigestInfo *di = 0;
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result->data = 0;
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digder.data = 0;
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/* Finish up digest function */
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if (cx->hashcx == NULL) {
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PORT_SetError(SEC_ERROR_INVALID_ARGS);
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return SECFailure;
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}
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(*cx->hashobj->end)(cx->hashcx, digest, &part1, sizeof(digest));
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if (privKey->keyType == rsaKey) {
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arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
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if ( !arena ) {
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rv = SECFailure;
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goto loser;
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}
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/* Construct digest info */
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di = SGN_CreateDigestInfo(cx->hashalg, digest, part1);
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if (!di) {
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rv = SECFailure;
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goto loser;
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}
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/* Der encode the digest as a DigestInfo */
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rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate, di);
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if (rv != SECSuccess) {
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goto loser;
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}
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} else {
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digder.data = digest;
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digder.len = part1;
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}
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/*
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** Encrypt signature after constructing appropriate PKCS#1 signature
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** block
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*/
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signatureLen = PK11_SignatureLen(privKey);
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if (signatureLen <= 0) {
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PORT_SetError(SEC_ERROR_INVALID_KEY);
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rv = SECFailure;
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goto loser;
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}
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sigitem.len = signatureLen;
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sigitem.data = (unsigned char*) PORT_Alloc(signatureLen);
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if (sigitem.data == NULL) {
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rv = SECFailure;
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goto loser;
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}
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rv = PK11_Sign(privKey, &sigitem, &digder);
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if (rv != SECSuccess) {
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PORT_Free(sigitem.data);
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sigitem.data = NULL;
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goto loser;
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}
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if ((cx->signalg == SEC_OID_ANSIX9_DSA_SIGNATURE) ||
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(cx->signalg == SEC_OID_ANSIX962_EC_PUBLIC_KEY)) {
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/* DSAU_EncodeDerSigWithLen works for DSA and ECDSA */
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rv = DSAU_EncodeDerSigWithLen(result, &sigitem, sigitem.len);
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PORT_Free(sigitem.data);
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if (rv != SECSuccess)
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goto loser;
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} else {
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result->len = sigitem.len;
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result->data = sigitem.data;
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}
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loser:
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SGN_DestroyDigestInfo(di);
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if (arena != NULL) {
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PORT_FreeArena(arena, PR_FALSE);
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}
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return rv;
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}
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/************************************************************************/
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/*
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** Sign a block of data returning in result a bunch of bytes that are the
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** signature. Returns zero on success, an error code on failure.
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*/
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SECStatus
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SEC_SignData(SECItem *res, unsigned char *buf, int len,
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SECKEYPrivateKey *pk, SECOidTag algid)
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{
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SECStatus rv;
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SGNContext *sgn;
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sgn = SGN_NewContext(algid, pk);
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if (sgn == NULL)
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return SECFailure;
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rv = SGN_Begin(sgn);
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if (rv != SECSuccess)
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goto loser;
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rv = SGN_Update(sgn, buf, len);
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if (rv != SECSuccess)
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goto loser;
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rv = SGN_End(sgn, res);
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loser:
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SGN_DestroyContext(sgn, PR_TRUE);
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return rv;
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}
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/************************************************************************/
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DERTemplate CERTSignedDataTemplate[] =
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{
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{ DER_SEQUENCE,
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0, NULL, sizeof(CERTSignedData) },
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{ DER_ANY,
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offsetof(CERTSignedData,data), },
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{ DER_INLINE,
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offsetof(CERTSignedData,signatureAlgorithm),
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SECAlgorithmIDTemplate, },
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{ DER_BIT_STRING,
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offsetof(CERTSignedData,signature), },
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{ 0, }
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};
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const SEC_ASN1Template CERT_SignedDataTemplate[] =
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{
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{ SEC_ASN1_SEQUENCE,
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0, NULL, sizeof(CERTSignedData) },
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{ SEC_ASN1_ANY,
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offsetof(CERTSignedData,data), },
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{ SEC_ASN1_INLINE,
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offsetof(CERTSignedData,signatureAlgorithm),
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SECOID_AlgorithmIDTemplate, },
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{ SEC_ASN1_BIT_STRING,
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offsetof(CERTSignedData,signature), },
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{ 0, }
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};
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SEC_ASN1_CHOOSER_IMPLEMENT(CERT_SignedDataTemplate)
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SECStatus
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SEC_DerSignData(PRArenaPool *arena, SECItem *result,
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unsigned char *buf, int len, SECKEYPrivateKey *pk, SECOidTag algID)
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{
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SECItem it;
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CERTSignedData sd;
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SECStatus rv;
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it.data = 0;
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/* XXX We should probably have some asserts here to make sure the key type
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* and algID match
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*/
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if (algID == SEC_OID_UNKNOWN) {
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switch(pk->keyType) {
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case rsaKey:
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algID = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION;
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break;
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case dsaKey:
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algID = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
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break;
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case ecKey:
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algID = SEC_OID_ANSIX962_ECDSA_SIGNATURE_WITH_SHA1_DIGEST;
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break;
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default:
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PORT_SetError(SEC_ERROR_INVALID_KEY);
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return SECFailure;
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}
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}
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/* Sign input buffer */
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rv = SEC_SignData(&it, buf, len, pk, algID);
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if (rv) goto loser;
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/* Fill out SignedData object */
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PORT_Memset(&sd, 0, sizeof(sd));
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sd.data.data = buf;
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sd.data.len = len;
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sd.signature.data = it.data;
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sd.signature.len = it.len << 3; /* convert to bit string */
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rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algID, 0);
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if (rv) goto loser;
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/* DER encode the signed data object */
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rv = DER_Encode(arena, result, CERTSignedDataTemplate, &sd);
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/* FALL THROUGH */
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loser:
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PORT_Free(it.data);
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return rv;
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}
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SECStatus
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SGN_Digest(SECKEYPrivateKey *privKey,
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SECOidTag algtag, SECItem *result, SECItem *digest)
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{
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int modulusLen;
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SECStatus rv;
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SECItem digder;
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PRArenaPool *arena = 0;
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SGNDigestInfo *di = 0;
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result->data = 0;
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if (privKey->keyType == rsaKey) {
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arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
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if ( !arena ) {
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rv = SECFailure;
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goto loser;
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}
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/* Construct digest info */
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di = SGN_CreateDigestInfo(algtag, digest->data, digest->len);
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if (!di) {
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rv = SECFailure;
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goto loser;
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}
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/* Der encode the digest as a DigestInfo */
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rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate, di);
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if (rv != SECSuccess) {
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goto loser;
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}
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} else {
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digder.data = digest->data;
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digder.len = digest->len;
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}
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/*
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** Encrypt signature after constructing appropriate PKCS#1 signature
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** block
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*/
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modulusLen = PK11_SignatureLen(privKey);
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if (modulusLen <= 0) {
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PORT_SetError(SEC_ERROR_INVALID_KEY);
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rv = SECFailure;
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goto loser;
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}
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result->len = modulusLen;
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result->data = (unsigned char*) PORT_Alloc(modulusLen);
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if (result->data == NULL) {
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rv = SECFailure;
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goto loser;
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}
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rv = PK11_Sign(privKey, result, &digder);
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if (rv != SECSuccess) {
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PORT_Free(result->data);
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result->data = NULL;
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}
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loser:
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SGN_DestroyDigestInfo(di);
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if (arena != NULL) {
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PORT_FreeArena(arena, PR_FALSE);
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}
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return rv;
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}
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SECOidTag
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SEC_GetSignatureAlgorithmOidTag(KeyType keyType, SECOidTag hashAlgTag)
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{
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SECOidTag sigTag = SEC_OID_UNKNOWN;
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switch (keyType) {
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case rsaKey:
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switch (hashAlgTag) {
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case SEC_OID_MD2:
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sigTag = SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION; break;
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case SEC_OID_MD5:
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sigTag = SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION; break;
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case SEC_OID_UNKNOWN: /* default for RSA if not specified */
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case SEC_OID_SHA1:
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sigTag = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION; break;
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case SEC_OID_SHA256:
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sigTag = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION; break;
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case SEC_OID_SHA384:
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sigTag = SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION; break;
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case SEC_OID_SHA512:
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sigTag = SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION; break;
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default:
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break;
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}
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break;
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case dsaKey:
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switch (hashAlgTag) {
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case SEC_OID_UNKNOWN: /* default for DSA if not specified */
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case SEC_OID_SHA1:
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sigTag = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST; break;
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default:
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break;
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}
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break;
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case ecKey:
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switch (hashAlgTag) {
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case SEC_OID_UNKNOWN: /* default for ECDSA if not specified */
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case SEC_OID_SHA1:
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sigTag = SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE; break;
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case SEC_OID_SHA256:
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sigTag = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE; break;
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case SEC_OID_SHA384:
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sigTag = SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE; break;
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case SEC_OID_SHA512:
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sigTag = SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE; break;
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default:
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break;
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}
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default:
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break;
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}
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return sigTag;
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}
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