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/*
* Signature stuff.
*
* ***** 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):
* Dr Vipul Gupta <vipul.gupta@sun.com>, 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 ***** */
/* $Id: secsign.c,v 1.14.2.3 2006/04/28 03:35:29 rrelyea%redhat.com Exp $ */
#include <stdio.h>
#include "cryptohi.h"
#include "sechash.h"
#include "secder.h"
#include "keyhi.h"
#include "secoid.h"
#include "secdig.h"
#include "pk11func.h"
#include "secerr.h"
struct SGNContextStr {
SECOidTag signalg;
SECOidTag hashalg;
void *hashcx;
const SECHashObject *hashobj;
SECKEYPrivateKey *key;
};
SGNContext *
SGN_NewContext(SECOidTag alg, SECKEYPrivateKey *key)
{
SGNContext *cx;
SECOidTag hashalg, signalg;
KeyType keyType;
/* OK, map a PKCS #7 hash and encrypt algorithm into
* a standard hashing algorithm. Why did we pass in the whole
* PKCS #7 algTag if we were just going to change here you might
* ask. Well the answer is for some cards we may have to do the
* hashing on card. It may not support CKM_RSA_PKCS sign algorithm,
* it may just support CKM_RSA_PKCS_WITH_SHA1 and/or CKM_RSA_PKCS_WITH_MD5.
*/
switch (alg) {
/* We probably shouldn't be generating MD2 signatures either */
case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION:
hashalg = SEC_OID_MD2;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION:
hashalg = SEC_OID_MD5;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION:
case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE:
hashalg = SEC_OID_SHA1;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
hashalg = SEC_OID_SHA256;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION:
hashalg = SEC_OID_SHA384;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
hashalg = SEC_OID_SHA512;
signalg = SEC_OID_PKCS1_RSA_ENCRYPTION;
keyType = rsaKey;
break;
/* what about normal DSA? */
case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST:
case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST:
hashalg = SEC_OID_SHA1;
signalg = SEC_OID_ANSIX9_DSA_SIGNATURE;
keyType = dsaKey;
break;
case SEC_OID_MISSI_DSS:
case SEC_OID_MISSI_KEA_DSS:
case SEC_OID_MISSI_KEA_DSS_OLD:
case SEC_OID_MISSI_DSS_OLD:
hashalg = SEC_OID_SHA1;
signalg = SEC_OID_MISSI_DSS; /* XXX Is there a better algid? */
keyType = fortezzaKey;
break;
case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE:
hashalg = SEC_OID_SHA1;
signalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
keyType = ecKey;
break;
case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE:
hashalg = SEC_OID_SHA256;
signalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
keyType = ecKey;
break;
case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE:
hashalg = SEC_OID_SHA384;
signalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
keyType = ecKey;
break;
case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE:
hashalg = SEC_OID_SHA512;
signalg = SEC_OID_ANSIX962_EC_PUBLIC_KEY;
keyType = ecKey;
break;
/* we don't implement MD4 hashes.
* we *CERTAINLY* don't want to sign one! */
case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION:
default:
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return 0;
}
/* verify our key type */
if (key->keyType != keyType &&
!((key->keyType == dsaKey) && (keyType == fortezzaKey)) &&
!((key->keyType == fortezzaKey) && (keyType == dsaKey)) ) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return 0;
}
#ifndef NSS_ECC_MORE_THAN_SUITE_B
if (key->keyType == ecKey) {
PORT_SetError(SEC_ERROR_INVALID_ALGORITHM);
return 0;
}
#endif
cx = (SGNContext*) PORT_ZAlloc(sizeof(SGNContext));
if (cx) {
cx->hashalg = hashalg;
cx->signalg = signalg;
cx->key = key;
}
return cx;
}
void
SGN_DestroyContext(SGNContext *cx, PRBool freeit)
{
if (cx) {
if (cx->hashcx != NULL) {
(*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
cx->hashcx = NULL;
}
if (freeit) {
PORT_ZFree(cx, sizeof(SGNContext));
}
}
}
SECStatus
SGN_Begin(SGNContext *cx)
{
if (cx->hashcx != NULL) {
(*cx->hashobj->destroy)(cx->hashcx, PR_TRUE);
cx->hashcx = NULL;
}
cx->hashobj = HASH_GetHashObjectByOidTag(cx->hashalg);
if (!cx->hashobj)
return SECFailure; /* error code is already set */
cx->hashcx = (*cx->hashobj->create)();
if (cx->hashcx == NULL)
return SECFailure;
(*cx->hashobj->begin)(cx->hashcx);
return SECSuccess;
}
SECStatus
SGN_Update(SGNContext *cx, unsigned char *input, unsigned inputLen)
{
if (cx->hashcx == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
(*cx->hashobj->update)(cx->hashcx, input, inputLen);
return SECSuccess;
}
SECStatus
SGN_End(SGNContext *cx, SECItem *result)
{
unsigned char digest[HASH_LENGTH_MAX];
unsigned part1;
int signatureLen;
SECStatus rv;
SECItem digder, sigitem;
PRArenaPool *arena = 0;
SECKEYPrivateKey *privKey = cx->key;
SGNDigestInfo *di = 0;
result->data = 0;
digder.data = 0;
/* Finish up digest function */
if (cx->hashcx == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
(*cx->hashobj->end)(cx->hashcx, digest, &part1, sizeof(digest));
if (privKey->keyType == rsaKey) {
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if ( !arena ) {
rv = SECFailure;
goto loser;
}
/* Construct digest info */
di = SGN_CreateDigestInfo(cx->hashalg, digest, part1);
if (!di) {
rv = SECFailure;
goto loser;
}
/* Der encode the digest as a DigestInfo */
rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate, di);
if (rv != SECSuccess) {
goto loser;
}
} else {
digder.data = digest;
digder.len = part1;
}
/*
** Encrypt signature after constructing appropriate PKCS#1 signature
** block
*/
signatureLen = PK11_SignatureLen(privKey);
if (signatureLen <= 0) {
PORT_SetError(SEC_ERROR_INVALID_KEY);
rv = SECFailure;
goto loser;
}
sigitem.len = signatureLen;
sigitem.data = (unsigned char*) PORT_Alloc(signatureLen);
if (sigitem.data == NULL) {
rv = SECFailure;
goto loser;
}
rv = PK11_Sign(privKey, &sigitem, &digder);
if (rv != SECSuccess) {
PORT_Free(sigitem.data);
sigitem.data = NULL;
goto loser;
}
if ((cx->signalg == SEC_OID_ANSIX9_DSA_SIGNATURE) ||
(cx->signalg == SEC_OID_ANSIX962_EC_PUBLIC_KEY)) {
/* DSAU_EncodeDerSigWithLen works for DSA and ECDSA */
rv = DSAU_EncodeDerSigWithLen(result, &sigitem, sigitem.len);
PORT_Free(sigitem.data);
if (rv != SECSuccess)
goto loser;
} else {
result->len = sigitem.len;
result->data = sigitem.data;
}
loser:
SGN_DestroyDigestInfo(di);
if (arena != NULL) {
PORT_FreeArena(arena, PR_FALSE);
}
return rv;
}
/************************************************************************/
/*
** Sign a block of data returning in result a bunch of bytes that are the
** signature. Returns zero on success, an error code on failure.
*/
SECStatus
SEC_SignData(SECItem *res, unsigned char *buf, int len,
SECKEYPrivateKey *pk, SECOidTag algid)
{
SECStatus rv;
SGNContext *sgn;
sgn = SGN_NewContext(algid, pk);
if (sgn == NULL)
return SECFailure;
rv = SGN_Begin(sgn);
if (rv != SECSuccess)
goto loser;
rv = SGN_Update(sgn, buf, len);
if (rv != SECSuccess)
goto loser;
rv = SGN_End(sgn, res);
loser:
SGN_DestroyContext(sgn, PR_TRUE);
return rv;
}
/************************************************************************/
DERTemplate CERTSignedDataTemplate[] =
{
{ DER_SEQUENCE,
0, NULL, sizeof(CERTSignedData) },
{ DER_ANY,
offsetof(CERTSignedData,data), },
{ DER_INLINE,
offsetof(CERTSignedData,signatureAlgorithm),
SECAlgorithmIDTemplate, },
{ DER_BIT_STRING,
offsetof(CERTSignedData,signature), },
{ 0, }
};
const SEC_ASN1Template CERT_SignedDataTemplate[] =
{
{ SEC_ASN1_SEQUENCE,
0, NULL, sizeof(CERTSignedData) },
{ SEC_ASN1_ANY,
offsetof(CERTSignedData,data), },
{ SEC_ASN1_INLINE,
offsetof(CERTSignedData,signatureAlgorithm),
SECOID_AlgorithmIDTemplate, },
{ SEC_ASN1_BIT_STRING,
offsetof(CERTSignedData,signature), },
{ 0, }
};
SEC_ASN1_CHOOSER_IMPLEMENT(CERT_SignedDataTemplate)
SECStatus
SEC_DerSignData(PRArenaPool *arena, SECItem *result,
unsigned char *buf, int len, SECKEYPrivateKey *pk, SECOidTag algID)
{
SECItem it;
CERTSignedData sd;
SECStatus rv;
it.data = 0;
/* XXX We should probably have some asserts here to make sure the key type
* and algID match
*/
if (algID == SEC_OID_UNKNOWN) {
switch(pk->keyType) {
case rsaKey:
algID = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION;
break;
case dsaKey:
algID = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST;
break;
case ecKey:
algID = SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE;
break;
default:
PORT_SetError(SEC_ERROR_INVALID_KEY);
return SECFailure;
}
}
/* Sign input buffer */
rv = SEC_SignData(&it, buf, len, pk, algID);
if (rv) goto loser;
/* Fill out SignedData object */
PORT_Memset(&sd, 0, sizeof(sd));
sd.data.data = buf;
sd.data.len = len;
sd.signature.data = it.data;
sd.signature.len = it.len << 3; /* convert to bit string */
rv = SECOID_SetAlgorithmID(arena, &sd.signatureAlgorithm, algID, 0);
if (rv) goto loser;
/* DER encode the signed data object */
rv = DER_Encode(arena, result, CERTSignedDataTemplate, &sd);
/* FALL THROUGH */
loser:
PORT_Free(it.data);
return rv;
}
SECStatus
SGN_Digest(SECKEYPrivateKey *privKey,
SECOidTag algtag, SECItem *result, SECItem *digest)
{
int modulusLen;
SECStatus rv;
SECItem digder;
PRArenaPool *arena = 0;
SGNDigestInfo *di = 0;
result->data = 0;
if (privKey->keyType == rsaKey) {
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if ( !arena ) {
rv = SECFailure;
goto loser;
}
/* Construct digest info */
di = SGN_CreateDigestInfo(algtag, digest->data, digest->len);
if (!di) {
rv = SECFailure;
goto loser;
}
/* Der encode the digest as a DigestInfo */
rv = DER_Encode(arena, &digder, SGNDigestInfoTemplate, di);
if (rv != SECSuccess) {
goto loser;
}
} else {
digder.data = digest->data;
digder.len = digest->len;
}
/*
** Encrypt signature after constructing appropriate PKCS#1 signature
** block
*/
modulusLen = PK11_SignatureLen(privKey);
if (modulusLen <= 0) {
PORT_SetError(SEC_ERROR_INVALID_KEY);
rv = SECFailure;
goto loser;
}
result->len = modulusLen;
result->data = (unsigned char*) PORT_Alloc(modulusLen);
if (result->data == NULL) {
rv = SECFailure;
goto loser;
}
rv = PK11_Sign(privKey, result, &digder);
if (rv != SECSuccess) {
PORT_Free(result->data);
result->data = NULL;
}
loser:
SGN_DestroyDigestInfo(di);
if (arena != NULL) {
PORT_FreeArena(arena, PR_FALSE);
}
return rv;
}
SECOidTag
SEC_GetSignatureAlgorithmOidTag(KeyType keyType, SECOidTag hashAlgTag)
{
SECOidTag sigTag = SEC_OID_UNKNOWN;
switch (keyType) {
case rsaKey:
switch (hashAlgTag) {
case SEC_OID_MD2:
sigTag = SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION; break;
case SEC_OID_UNKNOWN: /* default for RSA if not specified */
case SEC_OID_MD5:
sigTag = SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION; break;
case SEC_OID_SHA1:
sigTag = SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION; break;
case SEC_OID_SHA256:
sigTag = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION; break;
case SEC_OID_SHA384:
sigTag = SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION; break;
case SEC_OID_SHA512:
sigTag = SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION; break;
default:
break;
}
break;
case dsaKey:
switch (hashAlgTag) {
case SEC_OID_UNKNOWN: /* default for DSA if not specified */
case SEC_OID_SHA1:
sigTag = SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST; break;
default:
break;
}
break;
case ecKey:
switch (hashAlgTag) {
case SEC_OID_UNKNOWN: /* default for ECDSA if hash not specified */
case SEC_OID_SHA1: /* is ECDSA_SHA1_SIGNTARURE */
sigTag = SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE; break;
case SEC_OID_SHA256:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE; break;
case SEC_OID_SHA384:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE; break;
case SEC_OID_SHA512:
sigTag = SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE; break;
default:
break;
}
break;
default:
break;
}
return sigTag;
}
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