/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*

 * Header file for routines specific to S/MIME.  Keep things that are pure

 * pkcs7 out of here; this is for S/MIME policy, S/MIME interoperability, etc.

 */

#ifndef _SMIME_H_

#define _SMIME_H_ 1

#include "cms.h"

/************************************************************************/

SEC_BEGIN_PROTOS

/*

 * Initialize the local recording of the user S/MIME cipher preferences.

 * This function is called once for each cipher, the order being

 * important (first call records greatest preference, and so on).

 * When finished, it is called with a "which" of CIPHER_FAMILID_MASK.

 * If the function is called again after that, it is assumed that

 * the preferences are being reset, and the old preferences are

 * discarded.

 *

 * XXX This is for a particular user, and right now the storage is

 * XXX local, static.  The preference should be stored elsewhere to allow

 * XXX for multiple uses of one library?  How does SSL handle this;

 * XXX it has something similar?

 *

 *  - The "which" values are defined in ciferfam.h (the SMIME_* values,

 *    for example SMIME_DES_CBC_56).

 *  - If "on" is non-zero then the named cipher is enabled, otherwise

 *    it is disabled.  (It is not necessary to call the function for

 *    ciphers that are disabled, however, as that is the default.)

 *

 * If the cipher preference is successfully recorded, SECSuccess

 * is returned.  Otherwise SECFailure is returned.  The only errors

 * are due to failure allocating memory or bad parameters/calls:

 *	SEC_ERROR_XXX ("which" is not in the S/MIME cipher family)

 *	SEC_ERROR_XXX (function is being called more times than there

 *		are known/expected ciphers)

 */

extern SECStatus NSS_SMIMEUtil_EnableCipher(long which, int on);

/*

 * Initialize the local recording of the S/MIME policy.

 * This function is called to allow/disallow a particular cipher.

 *

 * XXX This is for the current module, I think, so local, static storage

 * XXX is okay.  Is that correct, or could multiple uses of the same

 * XXX library expect to operate under different policies?

 *

 *  - The "which" values are defined in ciferfam.h (the SMIME_* values,

 *    for example SMIME_DES_CBC_56).

 *  - If "on" is non-zero then the named cipher is enabled, otherwise

 *    it is disabled.

 */

extern SECStatus NSS_SMIMEUtils_AllowCipher(long which, int on);

/*

 * Does the current policy allow S/MIME decryption of this particular

 * algorithm and keysize?

 */

extern PRBool NSS_SMIMEUtil_DecryptionAllowed(SECAlgorithmID *algid, PK11SymKey *key);

/*

 * Does the current policy allow *any* S/MIME encryption (or decryption)?

 *

 * This tells whether or not *any* S/MIME encryption can be done,

 * according to policy.  Callers may use this to do nicer user interface

 * (say, greying out a checkbox so a user does not even try to encrypt

 * a message when they are not allowed to) or for any reason they want

 * to check whether S/MIME encryption (or decryption, for that matter)

 * may be done.

 *

 * It takes no arguments.  The return value is a simple boolean:

 *   PR_TRUE means encryption (or decryption) is *possible*

 *	(but may still fail due to other reasons, like because we cannot

 *	find all the necessary certs, etc.; PR_TRUE is *not* a guarantee)

 *   PR_FALSE means encryption (or decryption) is not permitted

 *

 * There are no errors from this routine.

 */

extern PRBool NSS_SMIMEUtil_EncryptionPossible(void);

/*

 * NSS_SMIMEUtil_CreateSMIMECapabilities - get S/MIME capabilities attr value

 *

 * scans the list of allowed and enabled ciphers and construct a PKCS9-compliant

 * S/MIME capabilities attribute value.

 */

extern SECStatus NSS_SMIMEUtil_CreateSMIMECapabilities(PLArenaPool *poolp, SECItem *dest);

/*

 * NSS_SMIMEUtil_CreateSMIMEEncKeyPrefs - create S/MIME encryption key preferences attr value

 */

extern SECStatus NSS_SMIMEUtil_CreateSMIMEEncKeyPrefs(PLArenaPool *poolp, SECItem *dest, CERTCertificate *cert);

/*

 * NSS_SMIMEUtil_CreateMSSMIMEEncKeyPrefs - create S/MIME encryption key preferences attr value using MS oid

 */

extern SECStatus NSS_SMIMEUtil_CreateMSSMIMEEncKeyPrefs(PLArenaPool *poolp, SECItem *dest, CERTCertificate *cert);

/*

 * NSS_SMIMEUtil_GetCertFromEncryptionKeyPreference - find cert marked by EncryptionKeyPreference

 *          attribute

 */

extern CERTCertificate *NSS_SMIMEUtil_GetCertFromEncryptionKeyPreference(CERTCertDBHandle *certdb, SECItem *DERekp);

/*

 * NSS_SMIMEUtil_FindBulkAlgForRecipients - find bulk algorithm suitable for all recipients

 */

extern SECStatus

NSS_SMIMEUtil_FindBulkAlgForRecipients(CERTCertificate **rcerts, SECOidTag *bulkalgtag, int *keysize);

/*

 * Return a boolean that indicates whether the underlying library

 * will perform as the caller expects.

 *

 * The only argument is a string, which should be the version

 * identifier of the NSS library. That string will be compared

 * against a string that represents the actual build version of

 * the S/MIME library.

 */

extern PRBool NSSSMIME_VersionCheck(const char *importedVersion);

/*

 * Returns a const string of the S/MIME library version.

 */

extern const char *NSSSMIME_GetVersion(void);

/************************************************************************/

SEC_END_PROTOS

#endif /* _SECMIME_H_ */