pkcs12.c

PGP—Pretty Good Privacy

        body_size = PKITagged(body_size, 1); /* this is seq like */

    return body_size;

} /* PKISizeofPFXInternal */

void PKIDropInPlacePFX(
    PKICONTEXT *ctx,
    PKIPFX *f)
{
    if (ctx == NULL)
        return;

    if (f == NULL) return ;
    PKIDropInPlaceVersion(ctx, &(f->version));
    PKIDropInPlaceContentInfo(ctx, &(f->authSafes));
    PKIFreeMacData(ctx, f->macData);
    f->macData = NULL;
} /* PKIDropInPlacePFX */

size_t PKIPackPFXInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKIPFX *asnstruct,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    size_t tagsize;
    size_t datasize;

    if (erret == NULL) return 0; /* can't report errors */

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) return 0;

    /* lth of the block body */
    datasize = PKISizeofPFX(ctx, asnstruct, PKIFALSE);
    tagsize = 1 + PKILengthSize(datasize);
    if (datasize+tagsize > buflen) {
        PKIERR(PKIErrPackBufferTooShort);
        return 0;
    }

    /* this is a SEQUENCE */
    bytesused = PKIPutTag(buf, (unsigned char)(tag|0x20), datasize);
    if (bytesused != tagsize) {
        PKIERR(PKIErrPackOverrun);
        return bytesused;
    }
    datasize += tagsize;

  do {

    /* field version of PFX */
    bytesused += PKIPackVersionInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->version), PKIID_Version, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field authSafes of PFX */
    bytesused += PKIPackContentInfoInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->authSafes), PKIID_ContentInfo, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field macData of PFX */
    if (asnstruct->macData != NULL) { /* optional */
        bytesused += PKIPackMacDataInternal(ctx, buf+bytesused, buflen-bytesused,
                          asnstruct->macData, PKIID_MacData, erret );
        if (bytesused > datasize || *erret != 0)
            break;
    }

  } while(0);

    if (bytesused < datasize && *erret == 0)
        PKIERR(PKIErrPackUnderrun)
    else if (bytesused > datasize && *erret == 0)
        PKIERR(PKIErrPackOverrun)

    return bytesused;
} /* PKIPackPFXInternal */

size_t PKIUnpkInPlacePFX(
    PKICONTEXT *ctx,
    PKIPFX *asnstruct,
    const unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused = 0;
    size_t datasize;
    size_t localsize;
    int indef = 0;

    PKITRACE_PRINT_FN((tag|0x20), 0x30, "SEQUENCE", "PFX" );

    if (erret == NULL) return 0; /* can't report errors */
    *erret = 0;

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }

    if (asnstruct == NULL) {
        PKIERR(PKIErrUnpackNoStructure);
        return 0;
    }

    if (buf == NULL) {
        PKIERR(PKIErrUnpackNoBlockPtr);
        return 0;
    }

    if (buflen <= 0) return 0; /* no error -- no block */

    if ( (*buf & 0xDF) != (tag & 0xDF) )
        return 0; /* no error code, just no block */
    if ( (*buf & 0x20) != 0x20) {
        PKIERR(PKIErrUnpackInvalidEncoding);
        return 0;
    }

    /* accept the tag byte */
    bytesused++;

    /* get the block length */
    bytesused += PKIGetLength(buf+bytesused, &datasize);
    if ((int)datasize == -1) {
        localsize = buflen;
        indef = 1;
    }
    else {
        localsize = bytesused + datasize;
        if (localsize > buflen) {
            PKIERR(PKIErrUnpackOverrun);
            return 0;
        }
    }

    PKITRACE_INCR_LEVEL;
  do {

    /* field version of PFX */
    bytesused += PKIUnpkInPlaceVersion(ctx, &(asnstruct->version), buf+bytesused,
                        localsize-bytesused, PKIID_Version, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field authSafes of PFX */
    bytesused += PKIUnpkInPlaceContentInfo(ctx, &(asnstruct->authSafes), buf+bytesused,
                        localsize-bytesused, PKIID_ContentInfo, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field macData of PFX */
    if (!indef && bytesused >= localsize) {
        PKITRACE_DECR_LEVEL;
        return bytesused;
    }
    if (indef && *(buf+bytesused) == 0x00 &&
                 *(buf+bytesused+1) == 0x00) {
        PKITRACE_DECR_LEVEL;
        bytesused += 2;
        return bytesused;
    }
    if (asnstruct->macData != NULL)
        PKIFreeMacData(ctx, asnstruct->macData);
    bytesused += PKIUnpackMacDataInternal(ctx, &(asnstruct->macData),
                    buf+bytesused, localsize-bytesused, PKIID_MacData, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    if (indef) {
        if ( *(buf+bytesused) != 0x00 &&
             *(buf+bytesused+1) != 0x00 ) {
            PKIERR(PKIErrUnpackInvalidEncoding);
            break;
        }
        bytesused += 2;
    }
  } while(0);

    PKITRACE_DECR_LEVEL;
    if (bytesused > localsize && *erret == 0)
        PKIERR(PKIErrUnpackOverrun);
    if (!indef && bytesused < localsize && *erret == 0)
        PKIERR(PKIErrUnpackUnderrun);

    return bytesused;
} /* PKIUnpkInPlacePFX */

size_t PKIUnpackPFXInternal(
    PKICONTEXT *ctx,
    PKIPFX **asnstruct,
    const unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKIPFX *local = NULL;

    if (erret == NULL) return 0;
    *erret = 0;

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) {
        PKIERR(PKIErrUnpackNoStructure);
        return 0;
    }
    *asnstruct = NULL;

    if (buflen <= 0) return 0; /* no bytes left */

    if ( (*buf & 0xDF) != (tag & 0xDF) ) 
        return 0; /* not correct tag */

    local = PKINewPFX(ctx); /* carve a block for it */
    bytesused = PKIUnpkInPlacePFX(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        if (local != NULL) PKIFreePFX(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackPFXInternal */


/******************************************************************
 * Routines for SafeContents
 ******************************************************************/

size_t PKISizeofSafeContentsInternal(
    PKISafeContents *asnstruct,
    int outerSizeFlag,
    int expTaggedFlag)
{
    long i, lth;
    size_t body_size = 0;

    if (asnstruct == NULL)
        return 0;

    lth = asnstruct->n ;
    if (lth > PKIMAX_SafeContents)
        lth = PKIMAX_SafeContents;	/* clamp it */
    for (i=0; i<lth; i++)
        body_size += PKISizeofSafeBagInternal((asnstruct->elt)[i], PKITRUE, PKIFALSE);

    if (outerSizeFlag == PKITRUE)
        body_size = PKITagged(body_size, 1);

    if (expTaggedFlag == PKITRUE)
        body_size = PKITagged(body_size, 1); /* this is seq like */

    return body_size;
} /* PKISizeofSafeContentsInternal */

void PKIDropInPlaceSafeContents(
    PKICONTEXT *ctx,
    PKISafeContents *f)
{
    long i, lth;

    if (ctx == NULL) return;
    if (f == NULL) return;

    lth = f->n ;
    if (lth > PKIMAX_SafeContents)
        lth = PKIMAX_SafeContents ;	/* clamp it */
    for (i=0;i<lth;i++) {
        PKIFreeSafeBag(ctx, (f->elt)[i]);
        (f->elt)[i] = NULL;
    }
} /* PKIDropInPlaceSafeContents */

size_t PKIPackSafeContentsInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKISafeContents *asnstruct,
    unsigned char tag,
    int *erret )
{
    size_t bytesused;
    size_t tagsize;
    size_t datasize;
    long numElem;
    int i;

    if (erret == NULL) return 0; /* can't report errors */

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) return 0;

    /* make sure there aren't too many elements */
    numElem = asnstruct->n;
    if (numElem > PKIMAX_SafeContents) {
        PKIERR(PKIErrPackSEQOFArrayTooLong);
        return 0;
    }

    /* lth of the block body */
    datasize = PKISizeofSafeContents(ctx, asnstruct, PKIFALSE);
    tagsize = 1 + PKILengthSize(datasize);
    if (datasize+tagsize > buflen) {
        PKIERR(PKIErrPackBufferTooShort);
        return 0;
    }

    /* this is a SEQ_OF */
    bytesused = PKIPutTag(buf, (unsigned char)(tag|0x20), datasize);
    if (bytesused != tagsize) {
        PKIERR(PKIErrPackOverrun);
        return bytesused;
    }
    datasize += tagsize;

    for (i=0; i<numElem; i++) {
        bytesused += PKIPackSafeBagInternal(ctx, buf+bytesused, buflen-bytesused,
                        (asnstruct->elt)[i],
                        PKIID_SafeBag, erret);
        if (bytesused > datasize || *erret != 0)
            break;
    }

    if (bytesused < datasize && *erret == 0)
        PKIERR(PKIErrPackUnderrun)
    else if (bytesused > datasize && *erret == 0)
        PKIERR(PKIErrPackOverrun);

    return bytesused;
} /* PKIPackSafeContentsInternal */

size_t PKIUnpkInPlaceSafeContents(
     PKICONTEXT *ctx,
     PKISafeContents *asnstruct,
     const unsigned char *buf,
     size_t buflen,
     unsigned char tag,
     int *erret)
{
    size_t bytesused = 0;
    size_t datasize;
    size_t localsize;
    int i ;
    int indef = 0;

    PKITRACE_PRINT_FN((tag|0x20), 0x30, "SEQUENCE OF", "SafeContents");

    if (erret == NULL) return 0;

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) {
        PKIERR(PKIErrUnpackNoStructure);
        return 0;
    }

    if (buf == NULL) {
        PKIERR(PKIErrUnpackNoBlockPtr);
        return 0;
    }

    if (buflen <= 0) return 0; /* out of bytes, no action */

    if ( (*buf & 0xDF) != (tag & 0xDF) )
        return 0; /* not my kind of block */
    if ( (*buf & 0x20) != 0x20) {
        PKIERR(PKIErrUnpackInvalidEncoding);
        return 0;
    }
    bytesused ++; /* consume the tag byte */

    PKITRACE_INCR_LEVEL;

    bytesused += PKIGetLength(buf+bytesused, &datasize);
    if ((int)datasize == -1) {
        localsize = buflen;
        indef = 1;
    }
    else {
        localsize = bytesused + datasize;
        if (localsize > buflen) {
            PKIERR(PKIErrUnpackOverrun);
            asnstruct->n = -1 ; /* note where (-1 treated as 0) */
            PKITRACE_DECR_LEVEL;
            return 0;
        }
    }

    for (i=0; (i < PKIMAX_SafeContents) && (bytesused < localsize); i++) {

        /* if this is indef length and we have EOC, done */
        if (indef && *(buf+bytesused) == 0x00 &&
                     *(buf+bytesused+1) == 0x00 )
            break;

        if (asnstruct->elt[i] == NULL)
            asnstruct->elt[i] = PKINewSafeBag(ctx);
        bytesused += PKIUnpkInPlaceSafeBag(ctx, asnstruct->elt[i], buf+bytesused,
                            localsize-bytesused, PKIID_SafeBag, erret);
        if (*erret != 0 || asnstruct->elt[i] == NULL)
            break;
        asnstruct->n = i+1 ; /* note the new element */
    } /* for */

    if (indef) {
        if ( *(buf+bytesused) != 0x00 &&
             *(buf+bytesused+1) != 0x00 ) {
            PKIERR(PKIErrUnpackInvalidEncoding);
        }
        else
            bytesused += 2;
    }

    PKITRACE_DECR_LEVEL;
    if (bytesused > localsize && *erret == 0)
        PKIERR(PKIErrUnpackOverrun);
    if (!indef && bytesused < localsize && *erret == 0)
        PKIERR(PKIErrUnpackUnderrun);

    return bytesused;
} /* PKIUnpkInPlaceSafeContents */

size_t PKIUnpackSafeContentsInternal(
    PKICONTEXT *ctx,
    PKISafeContents **asnstruct,
    const unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKISafeContents *local = NULL;

    if (erret == NULL) return 0;
    *erret = 0;

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) {
        PKIERR(PKIErrUnpackNoStructure);
        return 0;
    }
    *asnstruct = NULL;

    if (buflen <= 0) return 0; /* no bytes left */

    if ( (*buf & 0xDF) != (tag & 0xDF) ) 
        return 0; /* not correct ta