/*

 * secdig.h - public prototypes for digest-info functions

 *

 * 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/. */

#ifndef _SECDIG_H_

#define _SECDIG_H_

#include "utilrename.h"

#include "secdigt.h"

#include "seccomon.h"

#include "secasn1t.h" 

#include "secdert.h"

SEC_BEGIN_PROTOS

extern const SEC_ASN1Template sgn_DigestInfoTemplate[];

SEC_ASN1_CHOOSER_DECLARE(sgn_DigestInfoTemplate)

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

/*

** Digest-info functions

*/

/*

** Create a new digest-info object

** 	"algorithm" one of SEC_OID_MD2, SEC_OID_MD5, or SEC_OID_SHA1

** 	"sig" the raw signature data (from MD2 or MD5)

** 	"sigLen" the length of the signature data

**

** NOTE: this is a low level routine used to prepare some data for PKCS#1

** digital signature formatting.

**

** XXX It might be nice to combine the create and encode functions.

** I think that is all anybody ever wants to do anyway.

*/

extern SGNDigestInfo *SGN_CreateDigestInfo(SECOidTag algorithm,

					   const unsigned char *sig,

					   unsigned int sigLen);

/*

** Destroy a digest-info object

*/

extern void SGN_DestroyDigestInfo(SGNDigestInfo *info);

/*

** Encode a digest-info object

**	"poolp" is where to allocate the result from; it can be NULL in

**		which case generic heap allocation (XP_ALLOC) will be used

**	"dest" is where to store the result; it can be NULL, in which case

**		it will be allocated (from poolp or heap, as explained above)

**	"diginfo" is the object to be encoded

** The return value is NULL if any error occurred, otherwise it is the

** resulting SECItem (either allocated or the same as the "dest" parameter).

**

** XXX It might be nice to combine the create and encode functions.

** I think that is all anybody ever wants to do anyway.

*/

extern SECItem *SGN_EncodeDigestInfo(PLArenaPool *poolp, SECItem *dest,

				     SGNDigestInfo *diginfo);

/*

** Decode a DER encoded digest info objct.

**  didata is thr source of the encoded digest.  

** The return value is NULL if an error occurs.  Otherwise, a

** digest info object which is allocated within it's own

** pool is returned.  The digest info should be deleted

** by later calling SGN_DestroyDigestInfo.

*/

extern SGNDigestInfo *SGN_DecodeDigestInfo(SECItem *didata);

/*

** Copy digest info.

**  poolp is the arena to which the digest will be copied.

**  a is the destination digest, it must be non-NULL.

**  b is the source digest

** This function is for copying digests.  It allows digests

** to be copied into a specified pool.  If the digest is in

** the same pool as other data, you do not want to delete

** the digest by calling SGN_DestroyDigestInfo.  

** A return value of SECFailure indicates an error.  A return

** of SECSuccess indicates no error occurred.

*/

extern SECStatus  SGN_CopyDigestInfo(PLArenaPool *poolp,

					SGNDigestInfo *a, 

					SGNDigestInfo *b);

/*

** Compare two digest-info objects, returning the difference between

** them.

*/

extern SECComparison SGN_CompareDigestInfo(SGNDigestInfo *a, SGNDigestInfo *b);

SEC_END_PROTOS

#endif /* _SECDIG_H_ */