/*
* NSS_CMSEnvelopedData_Create - create an enveloped data message
*/
NSSCMSEnvelopedData *
NSS_CMSEnvelopedData_Create(NSSCMSMessage *cmsg, SECOidTag algorithm, int keysize)
{
void *mark;
NSSCMSEnvelopedData *envd;
PLArenaPool *poolp;
SECStatus rv;
poolp = cmsg->poolp;
mark = PORT_ArenaMark(poolp);
envd = (NSSCMSEnvelopedData *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSEnvelopedData));
if (envd == NULL)
goto loser;
envd->cmsg = cmsg;
/* version is set in NSS_CMSEnvelopedData_Encode_BeforeStart() */
rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, &(envd->contentInfo), algorithm, NULL, keysize);
if (rv != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return envd;
loser:
PORT_ArenaRelease(poolp, mark);
return NULL;
}
/*
* NSS_CMSEncryptedData_Create - create an empty encryptedData object.
*
* "algorithm" specifies the bulk encryption algorithm to use.
* "keysize" is the key size.
*
* An error results in a return value of NULL and an error set.
* (Retrieve specific errors via PORT_GetError()/XP_GetError().)
*/
NSSCMSEncryptedData *
NSS_CMSEncryptedData_Create(NSSCMSMessage *cmsg, SECOidTag algorithm,
int keysize)
{
void *mark;
NSSCMSEncryptedData *encd;
PLArenaPool *poolp;
SECAlgorithmID *pbe_algid;
SECStatus rv;
poolp = cmsg->poolp;
mark = PORT_ArenaMark(poolp);
encd = PORT_ArenaZNew(poolp, NSSCMSEncryptedData);
if (encd == NULL)
goto loser;
encd->cmsg = cmsg;
/* version is set in NSS_CMSEncryptedData_Encode_BeforeStart() */
if (!SEC_PKCS5IsAlgorithmPBEAlgTag(algorithm)) {
rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, &(encd->contentInfo),
algorithm, NULL, keysize);
} else {
/* Assume password-based-encryption.
* Note: we can't generate pkcs5v2 from this interface.
* PK11_CreateBPEAlgorithmID generates pkcs5v2 by accepting
* non-PBE oids and assuming that they are pkcs5v2 oids, but
* NSS_CMSEncryptedData_Create accepts non-PBE oids as regular
* CMS encrypted data, so we can't tell NSS_CMS_EncryptedData_Create
* to create pkcs5v2 PBEs */
pbe_algid = PK11_CreatePBEAlgorithmID(algorithm, 1, NULL);
if (pbe_algid == NULL) {
rv = SECFailure;
} else {
rv = NSS_CMSContentInfo_SetContentEncAlgID(poolp,
&(encd->contentInfo),
pbe_algid, keysize);
SECOID_DestroyAlgorithmID(pbe_algid, PR_TRUE);
}
}
if (rv != SECSuccess)
goto loser;
PORT_ArenaUnmark(poolp, mark);
return encd;
loser:
PORT_ArenaRelease(poolp, mark);
return NULL;
}
/*
* NSS_CMSEnvelopedData_Encode_BeforeStart - prepare this envelopedData for encoding
*
* at this point, we need
* - recipientinfos set up with recipient's certificates
* - a content encryption algorithm (if none, 3DES will be used)
*
* this function will generate a random content encryption key (aka bulk key),
* initialize the recipientinfos with certificate identification and wrap the bulk key
* using the proper algorithm for every certificiate.
* it will finally set the bulk algorithm and key so that the encode step can find it.
*/
SECStatus
NSS_CMSEnvelopedData_Encode_BeforeStart(NSSCMSEnvelopedData *envd)
{
int version;
NSSCMSRecipientInfo **recipientinfos;
NSSCMSContentInfo *cinfo;
PK11SymKey *bulkkey = NULL;
SECOidTag bulkalgtag;
CK_MECHANISM_TYPE type;
PK11SlotInfo *slot;
SECStatus rv;
SECItem *dummy;
PLArenaPool *poolp;
extern const SEC_ASN1Template NSSCMSRecipientInfoTemplate[];
void *mark = NULL;
int i;
poolp = envd->cmsg->poolp;
cinfo = &(envd->contentInfo);
recipientinfos = envd->recipientInfos;
if (recipientinfos == NULL) {
PORT_SetError(SEC_ERROR_BAD_DATA);
#if 0
PORT_SetErrorString("Cannot find recipientinfos to encode.");
#endif
goto loser;
}
version = NSS_CMS_ENVELOPED_DATA_VERSION_REG;
if (envd->originatorInfo != NULL || envd->unprotectedAttr != NULL) {
version = NSS_CMS_ENVELOPED_DATA_VERSION_ADV;
} else {
for (i = 0; recipientinfos[i] != NULL; i++) {
if (NSS_CMSRecipientInfo_GetVersion(recipientinfos[i]) != 0) {
version = NSS_CMS_ENVELOPED_DATA_VERSION_ADV;
break;
}
}
}
dummy = SEC_ASN1EncodeInteger(poolp, &(envd->version), version);
if (dummy == NULL)
goto loser;
/* now we need to have a proper content encryption algorithm
* on the SMIME level, we would figure one out by looking at SMIME capabilities
* we cannot do that on our level, so if none is set already, we'll just go
* with one of the mandatory algorithms (3DES) */
if ((bulkalgtag = NSS_CMSContentInfo_GetContentEncAlgTag(cinfo)) == SEC_OID_UNKNOWN) {
rv = NSS_CMSContentInfo_SetContentEncAlg(poolp, cinfo, SEC_OID_DES_EDE3_CBC, NULL, 168);
if (rv != SECSuccess)
goto loser;
bulkalgtag = SEC_OID_DES_EDE3_CBC;
}
/* generate a random bulk key suitable for content encryption alg */
type = PK11_AlgtagToMechanism(bulkalgtag);
slot = PK11_GetBestSlot(type, envd->cmsg->pwfn_arg);
if (slot == NULL)
goto loser; /* error has been set by PK11_GetBestSlot */
/* this is expensive... */
bulkkey = PK11_KeyGen(slot, type, NULL, NSS_CMSContentInfo_GetBulkKeySize(cinfo) / 8, envd->cmsg->pwfn_arg);
PK11_FreeSlot(slot);
if (bulkkey == NULL)
goto loser; /* error has been set by PK11_KeyGen */
mark = PORT_ArenaMark(poolp);
/* Encrypt the bulk key with the public key of each recipient. */
for (i = 0; recipientinfos[i] != NULL; i++) {
rv = NSS_CMSRecipientInfo_WrapBulkKey(recipientinfos[i], bulkkey, bulkalgtag);
if (rv != SECSuccess)
goto loser; /* error has been set by NSS_CMSRecipientInfo_EncryptBulkKey */
/* could be: alg not supported etc. */
}
/* the recipientinfos are all finished. now sort them by DER for SET OF encoding */
rv = NSS_CMSArray_SortByDER((void **)envd->recipientInfos, NSSCMSRecipientInfoTemplate, NULL);
if (rv != SECSuccess)
goto loser; /* error has been set by NSS_CMSArray_SortByDER */
/* store the bulk key in the contentInfo so that the encoder can find it */
NSS_CMSContentInfo_SetBulkKey(cinfo, bulkkey);
PORT_ArenaUnmark(poolp, mark);
PK11_FreeSymKey(bulkkey);
return SECSuccess;
loser:
if (mark != NULL)
PORT_ArenaRelease (poolp, mark);
if (bulkkey)
PK11_FreeSymKey(bulkkey);
return SECFailure;
}
