/* 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/. */

/*

 * CMS digestedData methods.

 */

#include "cmslocal.h"

#include "secitem.h"

#include "secasn1.h"

#include "secoid.h"

#include "secerr.h"

/*

 * NSS_CMSDigestedData_Create - create a digestedData object (presumably for encoding)

 *

 * version will be set by NSS_CMSDigestedData_Encode_BeforeStart

 * digestAlg is passed as parameter

 * contentInfo must be filled by the user

 * digest will be calculated while encoding

 */

NSSCMSDigestedData *

NSS_CMSDigestedData_Create(NSSCMSMessage *cmsg, SECAlgorithmID *digestalg)

{

    void *mark;

    NSSCMSDigestedData *digd;

    PLArenaPool *poolp;

    poolp = cmsg->poolp;

    mark = PORT_ArenaMark(poolp);

    digd = (NSSCMSDigestedData *)PORT_ArenaZAlloc(poolp, sizeof(NSSCMSDigestedData));

    if (digd == NULL)

        goto loser;

    digd->cmsg = cmsg;

    if (SECOID_CopyAlgorithmID(poolp, &(digd->digestAlg), digestalg) != SECSuccess)

        goto loser;

    PORT_ArenaUnmark(poolp, mark);

    return digd;

loser:

    PORT_ArenaRelease(poolp, mark);

    return NULL;

}

/*

 * NSS_CMSDigestedData_Destroy - destroy a digestedData object

 */

void

NSS_CMSDigestedData_Destroy(NSSCMSDigestedData *digd)

{

    /* everything's in a pool, so don't worry about the storage */

    NSS_CMSContentInfo_Destroy(&(digd->contentInfo));

    return;

}

/*

 * NSS_CMSDigestedData_GetContentInfo - return pointer to digestedData object's contentInfo

 */

NSSCMSContentInfo *

NSS_CMSDigestedData_GetContentInfo(NSSCMSDigestedData *digd)

{

    return &(digd->contentInfo);

}

/*

 * NSS_CMSDigestedData_Encode_BeforeStart - do all the necessary things to a DigestedData

 *     before encoding begins.

 *

 * In particular:

 *  - set the right version number. The contentInfo's content type must be set up already.

 */

SECStatus

NSS_CMSDigestedData_Encode_BeforeStart(NSSCMSDigestedData *digd)

{

    unsigned long version;

    SECItem *dummy;

    version = NSS_CMS_DIGESTED_DATA_VERSION_DATA;

    if (!NSS_CMSType_IsData(NSS_CMSContentInfo_GetContentTypeTag(

            &(digd->contentInfo))))

        version = NSS_CMS_DIGESTED_DATA_VERSION_ENCAP;

    dummy = SEC_ASN1EncodeInteger(digd->cmsg->poolp, &(digd->version), version);

    return (dummy == NULL) ? SECFailure : SECSuccess;

}

/*

 * NSS_CMSDigestedData_Encode_BeforeData - do all the necessary things to a DigestedData

 *     before the encapsulated data is passed through the encoder.

 *

 * In detail:

 *  - set up the digests if necessary

 */

SECStatus

NSS_CMSDigestedData_Encode_BeforeData(NSSCMSDigestedData *digd)

{

    SECStatus rv = NSS_CMSContentInfo_Private_Init(&digd->contentInfo);

    if (rv != SECSuccess) {

        return SECFailure;

    }

    /* set up the digests */

    if (digd->digestAlg.algorithm.len != 0 && digd->digest.len == 0) {

        /* if digest is already there, do nothing */

        digd->contentInfo.privateInfo->digcx = NSS_CMSDigestContext_StartSingle(&(digd->digestAlg));

        if (digd->contentInfo.privateInfo->digcx == NULL)

            return SECFailure;

    }

    return SECSuccess;

}

/*

 * NSS_CMSDigestedData_Encode_AfterData - do all the necessary things to a DigestedData

 *     after all the encapsulated data was passed through the encoder.

 *

 * In detail:

 *  - finish the digests

 */

SECStatus

NSS_CMSDigestedData_Encode_AfterData(NSSCMSDigestedData *digd)

{

    SECStatus rv = SECSuccess;

    /* did we have digest calculation going on? */

    if (digd->contentInfo.privateInfo && digd->contentInfo.privateInfo->digcx) {

        rv = NSS_CMSDigestContext_FinishSingle(digd->contentInfo.privateInfo->digcx,

                                               digd->cmsg->poolp,

                                               &(digd->digest));

        /* error has been set by NSS_CMSDigestContext_FinishSingle */

        digd->contentInfo.privateInfo->digcx = NULL;

    }

    return rv;

}

/*

 * NSS_CMSDigestedData_Decode_BeforeData - do all the necessary things to a DigestedData

 *     before the encapsulated data is passed through the encoder.

 *

 * In detail:

 *  - set up the digests if necessary

 */

SECStatus

NSS_CMSDigestedData_Decode_BeforeData(NSSCMSDigestedData *digd)

{

    SECStatus rv;

    /* is there a digest algorithm yet? */

    if (digd->digestAlg.algorithm.len == 0)

        return SECFailure;

    rv = NSS_CMSContentInfo_Private_Init(&digd->contentInfo);

    if (rv != SECSuccess) {

        return SECFailure;

    }

    digd->contentInfo.privateInfo->digcx = NSS_CMSDigestContext_StartSingle(&(digd->digestAlg));

    if (digd->contentInfo.privateInfo->digcx == NULL)

        return SECFailure;

    return SECSuccess;

}

/*

 * NSS_CMSDigestedData_Decode_AfterData - do all the necessary things to a DigestedData

 *     after all the encapsulated data was passed through the encoder.

 *

 * In detail:

 *  - finish the digests

 */

SECStatus

NSS_CMSDigestedData_Decode_AfterData(NSSCMSDigestedData *digd)

{

    SECStatus rv = SECSuccess;

    /* did we have digest calculation going on? */

    if (digd->contentInfo.privateInfo && digd->contentInfo.privateInfo->digcx) {

        rv = NSS_CMSDigestContext_FinishSingle(digd->contentInfo.privateInfo->digcx,

                                               digd->cmsg->poolp,

                                               &(digd->cdigest));

        /* error has been set by NSS_CMSDigestContext_FinishSingle */

        digd->contentInfo.privateInfo->digcx = NULL;

    }

    return rv;

}

/*

 * NSS_CMSDigestedData_Decode_AfterEnd - finalize a digestedData.

 *

 * In detail:

 *  - check the digests for equality

 */

SECStatus

NSS_CMSDigestedData_Decode_AfterEnd(NSSCMSDigestedData *digd)

{

    /* did we have digest calculation going on? */

    if (digd->cdigest.len != 0) {

        /* XXX comparision btw digest & cdigest */

        /* XXX set status */

        /* TODO!!!! */

    }

    return SECSuccess;

}