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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
* Red Hat, Inc.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bob Relyea (rrelyea@redhat.com)
*
* 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 DEBUG
static const char CVS_ID[] = "@(#) $RCSfile: crsa.c,v $ $Revision: 1.3 $ $Date: 2005/11/15 00:13:58 $";
#endif /* DEBUG */
#include "ckcapi.h"
#include "secdert.h"
#define SSL3_SHAMD5_HASH_SIZE 36 /* LEN_MD5 (16) + LEN_SHA1 (20) */
/*
* ckcapi/crsa.c
*
* This file implements the NSSCKMDMechnaism and NSSCKMDCryptoOperation objects
* for the RSA operation on the CAPI cryptoki module.
*/
/*
* write a Decimal value to a string
*/
static char *
putDecimalString(char *cstr, unsigned long value)
{
unsigned long tenpower;
int first = 1;
for (tenpower=10000000; tenpower; tenpower /= 10) {
unsigned char digit = (unsigned char )(value/tenpower);
value = value % tenpower;
/* drop leading zeros */
if (first && (0 == digit)) {
continue;
}
first = 0;
*cstr++ = digit + '0';
}
/* if value was zero, put one of them out */
if (first) {
*cstr++ = '0';
}
return cstr;
}
/*
* Create a Capi OID string value from a DER OID
*/
static char *
nss_ckcapi_GetOidString
(
unsigned char *oidTag,
int oidTagSize,
CK_RV *pError
)
{
unsigned char *oid;
char *oidStr;
char *cstr;
unsigned long value;
int oidSize;
if (DER_OBJECT_ID != *oidTag) {
/* wasn't an oid */
*pError = CKR_DATA_INVALID;
return NULL;
}
oid = nss_ckcapi_DERUnwrap(oidTag, oidTagSize, &oidSize, NULL);
if (oidSize < 2) {
*pError = CKR_DATA_INVALID;
return NULL;
}
oidStr = nss_ZNEWARRAY( NULL, char, oidSize*4 );
if ((char *)NULL == oidStr) {
*pError = CKR_HOST_MEMORY;
return NULL;
}
cstr = oidStr;
cstr = putDecimalString(cstr, (*oid) / 40);
*cstr++ = '.';
cstr = putDecimalString(cstr, (*oid) % 40);
oidSize--;
value = 0;
while (oidSize--) {
oid++;
value = (value << 7) + (*oid & 0x7f);
if (0 == (*oid & 0x80)) {
*cstr++ = '.';
cstr = putDecimalString(cstr, value);
value = 0;
}
}
*cstr = 0; /* NULL terminate */
if (value != 0) {
nss_ZFreeIf(oidStr);
*pError = CKR_DATA_INVALID;
return NULL;
}
return oidStr;
}
/*
* PKCS #11 sign for RSA expects to take a fully DER-encoded hash value,
* which includes the hash OID. CAPI expects to take a Hash Context. While
* CAPI does have the capability of setting a raw hash value, it does not
* have the ability to sign an arbitrary value. This function tries to
* reduce the passed in data into something that CAPI could actually sign.
*/
static CK_RV
ckcapi_GetRawHash
(
const NSSItem *input,
NSSItem *hash,
ALG_ID *hashAlg
)
{
unsigned char *current;
unsigned char *algid;
unsigned char *oid;
unsigned char *hashData;
char *oidStr;
CK_RV error;
int oidSize;
int size;
/*
* there are 2 types of hashes NSS typically tries to sign, regular
* RSA signature format (with encoded DER_OIDS), and SSL3 Signed hashes.
* CAPI knows not to add any oids to SSL3_Signed hashes, so if we have any
* random hash that is exactly the same size as an SSL3 hash, then we can
* just pass the data through. CAPI has know way of knowing if the value
* is really a combined hash or some other arbitrary data, so it's safe to
* handle this case first.
*/
if (SSL3_SHAMD5_HASH_SIZE == input->size) {
hash->data = input->data;
hash->size = input->size;
*hashAlg = CALG_SSL3_SHAMD5;
return CKR_OK;
}
current = (unsigned char *)input->data;
/* make sure we have a sequence tag */
if ((DER_SEQUENCE|DER_CONSTRUCTED) != *current) {
return CKR_DATA_INVALID;
}
/* parse the input block to get 1) the hash oid, and 2) the raw hash value.
* unfortunatly CAPI doesn't have a builtin function to do this work, so
* we go ahead and do it by hand here.
*
* format is:
* SEQUENCE {
* SECQUENCE { // algid
* OID {} // oid
* ANY {} // optional params
* }
* OCTECT {} // hash
*/
/* unwrap */
algid = nss_ckcapi_DERUnwrap(current,input->size, &size, NULL);
if (algid+size != current+input->size) {
/* make sure there is not extra data at the end */
return CKR_DATA_INVALID;
}
if ((DER_SEQUENCE|DER_CONSTRUCTED) != *algid) {
/* wasn't an algid */
return CKR_DATA_INVALID;
}
oid = nss_ckcapi_DERUnwrap(algid, size, &oidSize, &hashData);
if (DER_OCTET_STRING != *hashData) {
/* wasn't a hash */
return CKR_DATA_INVALID;
}
/* get the real hash */
current = hashData;
size = size - (hashData-algid);
hash->data = nss_ckcapi_DERUnwrap(current, size, &hash->size, NULL);
/* get the real oid as a string. Again, Microsoft does not
* export anything that does this for us */
oidStr = nss_ckcapi_GetOidString(oid, oidSize, &error);
if ((char *)NULL == oidStr ) {
return error;
}
/* look up the hash alg from the oid (fortunately CAPI does to this) */
*hashAlg = CertOIDToAlgId(oidStr);
nss_ZFreeIf(oidStr);
if (0 == *hashAlg) {
return CKR_HOST_MEMORY;
}
/* hash looks reasonably consistent, we should be able to sign it now */
return CKR_OK;
}
/*
* So everyone else in the worlds stores their bignum data MSB first, but not
* Microsoft, we need to byte swap everything coming into and out of CAPI.
*/
void
ckcapi_ReverseData(NSSItem *item)
{
int end = (item->size)-1;
int middle = (item->size)/2;
unsigned char *buf = item->data;
int i;
for (i=0; i < middle; i++) {
unsigned char tmp = buf[i];
buf[i] = buf[end-i];
buf[end-i] = tmp;
}
return;
}
typedef struct ckcapiInternalCryptoOperationRSAPrivStr
ckcapiInternalCryptoOperationRSAPriv;
struct ckcapiInternalCryptoOperationRSAPrivStr
{
NSSCKMDCryptoOperation mdOperation;
NSSCKMDMechanism *mdMechanism;
ckcapiInternalObject *iKey;
HCRYPTPROV hProv;
DWORD keySpec;
HCRYPTKEY hKey;
NSSItem *buffer;
};
/*
* ckcapi_mdCryptoOperationRSAPriv_Create
*/
static NSSCKMDCryptoOperation *
ckcapi_mdCryptoOperationRSAPriv_Create
(
const NSSCKMDCryptoOperation *proto,
NSSCKMDMechanism *mdMechanism,
NSSCKMDObject *mdKey,
CK_RV *pError
)
{
ckcapiInternalObject *iKey = (ckcapiInternalObject *)mdKey->etc;
const NSSItem *classItem = nss_ckcapi_FetchAttribute(iKey, CKA_CLASS);
const NSSItem *keyType = nss_ckcapi_FetchAttribute(iKey, CKA_KEY_TYPE);
ckcapiInternalCryptoOperationRSAPriv *iOperation;
CK_RV error;
HCRYPTPROV hProv;
DWORD keySpec;
HCRYPTKEY hKey;
/* make sure we have the right objects */
if (((const NSSItem *)NULL == classItem) ||
(sizeof(CK_OBJECT_CLASS) != classItem->size) ||
(CKO_PRIVATE_KEY != *(CK_OBJECT_CLASS *)classItem->data) ||
((const NSSItem *)NULL == keyType) ||
(sizeof(CK_KEY_TYPE) != keyType->size) ||
(CKK_RSA != *(CK_KEY_TYPE *)keyType->data)) {
*pError = CKR_KEY_TYPE_INCONSISTENT;
return (NSSCKMDCryptoOperation *)NULL;
}
error = nss_ckcapi_FetchKeyContainer(iKey, &hProv, &keySpec, &hKey);
if (error != CKR_OK) {
*pError = error;
return (NSSCKMDCryptoOperation *)NULL;
}
iOperation = nss_ZNEW(NULL, ckcapiInternalCryptoOperationRSAPriv);
if ((ckcapiInternalCryptoOperationRSAPriv *)NULL == iOperation) {
*pError = CKR_HOST_MEMORY;
return (NSSCKMDCryptoOperation *)NULL;
}
iOperation->mdMechanism = mdMechanism;
iOperation->iKey = iKey;
iOperation->hProv = hProv;
iOperation->keySpec = keySpec;
iOperation->hKey = hKey;
nsslibc_memcpy(&iOperation->mdOperation,
proto, sizeof(NSSCKMDCryptoOperation));
iOperation->mdOperation.etc = iOperation;
return &iOperation->mdOperation;
}
static CK_RV
ckcapi_mdCryptoOperationRSAPriv_Destroy
(
NSSCKMDCryptoOperation *mdOperation,
NSSCKFWCryptoOperation *fwOperation,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance
)
{
ckcapiInternalCryptoOperationRSAPriv *iOperation =
(ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc;
if (iOperation->hKey) {
CryptDestroyKey(iOperation->hKey);
}
if (iOperation->buffer) {
nssItem_Destroy(iOperation->buffer);
}
nss_ZFreeIf(iOperation);
return CKR_OK;
}
static CK_ULONG
ckcapi_mdCryptoOperationRSA_GetFinalLength
(
NSSCKMDCryptoOperation *mdOperation,
NSSCKFWCryptoOperation *fwOperation,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
CK_RV *pError
)
{
ckcapiInternalCryptoOperationRSAPriv *iOperation =
(ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc;
const NSSItem *modulus =
nss_ckcapi_FetchAttribute(iOperation->iKey, CKA_MODULUS);
return modulus->size;
}
/*
* ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength
* we won't know the length until we actually decrypt the
* input block. Since we go to all the work to decrypt the
* the block, we'll save if for when the block is asked for
*/
static CK_ULONG
ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength
(
NSSCKMDCryptoOperation *mdOperation,
NSSCKFWCryptoOperation *fwOperation,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
const NSSItem *input,
CK_RV *pError
)
{
ckcapiInternalCryptoOperationRSAPriv *iOperation =
(ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc;
BOOL rc;
/* Microsoft's Decrypt operation works in place. Since we don't want
* to trash our input buffer, we make a copy of it */
iOperation->buffer = nssItem_Duplicate((NSSItem *)input, NULL, NULL);
if ((NSSItem *) NULL == iOperation->buffer) {
*pError = CKR_HOST_MEMORY;
return 0;
}
/* Sigh, reverse it */
ckcapi_ReverseData(iOperation->buffer);
rc = CryptDecrypt(iOperation->hKey, 0, TRUE, 0,
iOperation->buffer->data, &iOperation->buffer->size);
if (!rc) {
DWORD msError = GetLastError();
switch (msError) {
case NTE_BAD_DATA:
*pError = CKR_ENCRYPTED_DATA_INVALID;
break;
case NTE_FAIL:
case NTE_BAD_UID:
*pError = CKR_DEVICE_ERROR;
break;
default:
*pError = CKR_GENERAL_ERROR;
}
return 0;
}
return iOperation->buffer->size;
}
/*
* ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal
*
* NOTE: ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength is presumed to
* have been called previously.
*/
static CK_RV
ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal
(
NSSCKMDCryptoOperation *mdOperation,
NSSCKFWCryptoOperation *fwOperation,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
const NSSItem *input,
NSSItem *output
)
{
ckcapiInternalCryptoOperationRSAPriv *iOperation =
(ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc;
NSSItem *buffer = iOperation->buffer;
if ((NSSItem *)NULL == buffer) {
return CKR_GENERAL_ERROR;
}
nsslibc_memcpy(output->data, buffer->data, buffer->size);
output->size = buffer->size;
return CKR_OK;
}
/*
* ckcapi_mdCryptoOperationRSASign_UpdateFinal
*
*/
static CK_RV
ckcapi_mdCryptoOperationRSASign_UpdateFinal
(
NSSCKMDCryptoOperation *mdOperation,
NSSCKFWCryptoOperation *fwOperation,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
const NSSItem *input,
NSSItem *output
)
{
ckcapiInternalCryptoOperationRSAPriv *iOperation =
(ckcapiInternalCryptoOperationRSAPriv *)mdOperation->etc;
CK_RV error = CKR_OK;
DWORD msError;
NSSItem hash;
HCRYPTHASH hHash = 0;
ALG_ID hashAlg;
DWORD hashSize;
DWORD len; /* temp length value we throw away */
BOOL rc;
/*
* PKCS #11 sign for RSA expects to take a fully DER-encoded hash value,
* which includes the hash OID. CAPI expects to take a Hash Context. While
* CAPI does have the capability of setting a raw hash value, it does not
* have the ability to sign an arbitrary value. This function tries to
* reduce the passed in data into something that CAPI could actually sign.
*/
error = ckcapi_GetRawHash(input, &hash, &hashAlg);
if (CKR_OK != error) {
goto loser;
}
rc = CryptCreateHash(iOperation->hProv, hashAlg, 0, 0, &hHash);
if (!rc) {
goto loser;
}
/* make sure the hash lens match before we set it */
len = sizeof(DWORD);
rc = CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE *)&hashSize, &len, 0);
if (!rc) {
goto loser;
}
if (hash.size != hashSize) {
/* The input must have been bad for this to happen */
error = CKR_DATA_INVALID;
goto loser;
}
/* we have an explicit hash, set it, note that the length is
* implicit by the hashAlg used in create */
rc = CryptSetHashParam(hHash, HP_HASHVAL, hash.data, 0);
if (!rc) {
goto loser;
}
/* OK, we have the data in a hash structure, sign it! */
rc = CryptSignHash(hHash, iOperation->keySpec, NULL, 0,
output->data, &output->size);
if (!rc) {
goto loser;
}
/* Don't return a signature that might have been broken because of a cosmic
* ray, or a broken processor, verify that it is valid... */
rc = CryptVerifySignature(hHash, output->data, output->size,
iOperation->hKey, NULL, 0);
if (!rc) {
goto loser;
}
/* OK, Microsoft likes to do things completely differently than anyone
* else. We need to reverse the data we recieved here */
ckcapi_ReverseData(output);
CryptDestroyHash(hHash);
return CKR_OK;
loser:
/* map the microsoft error */
if (CKR_OK == error) {
msError = GetLastError();
switch (msError) {
case ERROR_NOT_ENOUGH_MEMORY:
error = CKR_HOST_MEMORY;
break;
case NTE_NO_MEMORY:
error = CKR_DEVICE_MEMORY;
break;
case ERROR_MORE_DATA:
return CKR_BUFFER_TOO_SMALL;
case ERROR_INVALID_PARAMETER: /* these params were derived from the */
case ERROR_INVALID_HANDLE: /* inputs, so if they are bad, the input */
case NTE_BAD_ALGID: /* data is bad */
case NTE_BAD_HASH:
error = CKR_DATA_INVALID;
break;
case ERROR_BUSY:
case NTE_FAIL:
case NTE_BAD_UID:
error = CKR_DEVICE_ERROR;
break;
default:
error = CKR_GENERAL_ERROR;
break;
}
}
if (hHash) {
CryptDestroyHash(hHash);
}
return error;
}
NSS_IMPLEMENT_DATA const NSSCKMDCryptoOperation
ckcapi_mdCryptoOperationRSADecrypt_proto = {
NULL, /* etc */
ckcapi_mdCryptoOperationRSAPriv_Destroy,
NULL, /* GetFinalLengh - not needed for one shot Decrypt/Encrypt */
ckcapi_mdCryptoOperationRSADecrypt_GetOperationLength,
NULL, /* Final - not needed for one shot operation */
NULL, /* Update - not needed for one shot operation */
NULL, /* DigetUpdate - not needed for one shot operation */
ckcapi_mdCryptoOperationRSADecrypt_UpdateFinal,
NULL, /* UpdateCombo - not needed for one shot operation */
NULL, /* DigetKey - not needed for one shot operation */
(void *)NULL /* null terminator */
};
NSS_IMPLEMENT_DATA const NSSCKMDCryptoOperation
ckcapi_mdCryptoOperationRSASign_proto = {
NULL, /* etc */
ckcapi_mdCryptoOperationRSAPriv_Destroy,
ckcapi_mdCryptoOperationRSA_GetFinalLength,
NULL, /* GetOperationLengh - not needed for one shot Sign/Verify */
NULL, /* Final - not needed for one shot operation */
NULL, /* Update - not needed for one shot operation */
NULL, /* DigetUpdate - not needed for one shot operation */
ckcapi_mdCryptoOperationRSASign_UpdateFinal,
NULL, /* UpdateCombo - not needed for one shot operation */
NULL, /* DigetKey - not needed for one shot operation */
(void *)NULL /* null terminator */
};
/********** NSSCKMDMechansim functions ***********************/
/*
* ckcapi_mdMechanismRSA_Destroy
*/
static void
ckcapi_mdMechanismRSA_Destroy
(
NSSCKMDMechanism *mdMechanism,
NSSCKFWMechanism *fwMechanism,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance
)
{
nss_ZFreeIf(fwMechanism);
}
/*
* ckcapi_mdMechanismRSA_GetMinKeySize
*/
static CK_ULONG
ckcapi_mdMechanismRSA_GetMinKeySize
(
NSSCKMDMechanism *mdMechanism,
NSSCKFWMechanism *fwMechanism,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
CK_RV *pError
)
{
return 384;
}
/*
* ckcapi_mdMechanismRSA_GetMaxKeySize
*/
static CK_ULONG
ckcapi_mdMechanismRSA_GetMaxKeySize
(
NSSCKMDMechanism *mdMechanism,
NSSCKFWMechanism *fwMechanism,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
CK_RV *pError
)
{
return 16384;
}
/*
* ckcapi_mdMechanismRSA_DecryptInit
*/
static NSSCKMDCryptoOperation *
ckcapi_mdMechanismRSA_DecryptInit
(
NSSCKMDMechanism *mdMechanism,
NSSCKFWMechanism *fwMechanism,
CK_MECHANISM *pMechanism,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
NSSCKMDObject *mdKey,
NSSCKFWObject *fwKey,
CK_RV *pError
)
{
return ckcapi_mdCryptoOperationRSAPriv_Create(
&ckcapi_mdCryptoOperationRSADecrypt_proto,
mdMechanism, mdKey, pError);
}
/*
* ckcapi_mdMechanismRSA_SignInit
*/
static NSSCKMDCryptoOperation *
ckcapi_mdMechanismRSA_SignInit
(
NSSCKMDMechanism *mdMechanism,
NSSCKFWMechanism *fwMechanism,
CK_MECHANISM *pMechanism,
NSSCKMDSession *mdSession,
NSSCKFWSession *fwSession,
NSSCKMDToken *mdToken,
NSSCKFWToken *fwToken,
NSSCKMDInstance *mdInstance,
NSSCKFWInstance *fwInstance,
NSSCKMDObject *mdKey,
NSSCKFWObject *fwKey,
CK_RV *pError
)
{
return ckcapi_mdCryptoOperationRSAPriv_Create(
&ckcapi_mdCryptoOperationRSASign_proto,
mdMechanism, mdKey, pError);
}
NSS_IMPLEMENT_DATA const NSSCKMDMechanism
nss_ckcapi_mdMechanismRSA = {
(void *)NULL, /* etc */
ckcapi_mdMechanismRSA_Destroy,
ckcapi_mdMechanismRSA_GetMinKeySize,
ckcapi_mdMechanismRSA_GetMaxKeySize,
NULL, /* GetInHardware - default false */
NULL, /* EncryptInit - default errs */
ckcapi_mdMechanismRSA_DecryptInit,
NULL, /* DigestInit - default errs*/
ckcapi_mdMechanismRSA_SignInit,
NULL, /* VerifyInit - default errs */
ckcapi_mdMechanismRSA_SignInit, /* SignRecoverInit */
NULL, /* VerifyRecoverInit - default errs */
NULL, /* GenerateKey - default errs */
NULL, /* GenerateKeyPair - default errs */
NULL, /* GetWrapKeyLength - default errs */
NULL, /* WrapKey - default errs */
NULL, /* UnwrapKey - default errs */
NULL, /* DeriveKey - default errs */
(void *)NULL /* null terminator */
};
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