pkcs12.c

PGP—Pretty Good Privacy

    }

    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 mac of MacData */
    bytesused += PKIUnpkInPlaceDigestInfo(ctx, &(asnstruct->mac), (PGPByte *) (buf+bytesused),
                        localsize-bytesused, PKIID_DigestInfo, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field macSalt of MacData */
    bytesused += PKIUnpkInPlaceOCTET_STRING(ctx, &(asnstruct->macSalt), buf+bytesused,
                        localsize-bytesused, PKIID_OCTET_STRING, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field macIterationCount of MacData */
    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->macIterationCount != NULL)
        PKIFreeINTEGER(ctx, asnstruct->macIterationCount);
    bytesused += PKIUnpackINTEGERInternal(ctx, &(asnstruct->macIterationCount),
                    buf+bytesused, localsize-bytesused, PKIID_INTEGER, 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;
} /* PKIUnpkInPlaceMacData */

size_t PKIUnpackMacDataInternal(
    PKICONTEXT *ctx,
    PKIMacData **asnstruct,
    const unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKIMacData *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 = PKINewMacData(ctx); /* carve a block for it */
    bytesused = PKIUnpkInPlaceMacData(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        if (local != NULL) PKIFreeMacData(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackMacDataInternal */


/******************************************************************
 * Routines for SafeBag
 ******************************************************************/

size_t PKISizeofSafeBagInternal(
    PKISafeBag *asnstruct,
    int outerSizeFlag,
    int expTaggedFlag)
{
    size_t body_size = 0;

    if (asnstruct == NULL)
        return 0;

    body_size =
            PKISizeofOBJECT_IDInternal(&asnstruct->bagType, PKITRUE, PKIFALSE)
          + PKISizeofANYInternal(&asnstruct->bagContent, PKITRUE, PKITRUE)
          + PKISizeofAttributesInternal(asnstruct->bagAttributes, 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;

} /* PKISizeofSafeBagInternal */

void PKIDropInPlaceSafeBag(
    PKICONTEXT *ctx,
    PKISafeBag *f)
{
    if (ctx == NULL)
        return;

    if (f == NULL) return ;
    PKIDropInPlaceOBJECT_ID(ctx, &(f->bagType));
    PKIDropInPlaceANY(ctx, &(f->bagContent));
    PKIFreeAttributes(ctx, f->bagAttributes);
    f->bagAttributes = NULL;
} /* PKIDropInPlaceSafeBag */

size_t PKIPackSafeBagInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKISafeBag *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 = PKISizeofSafeBag(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 bagType of SafeBag */
    bytesused += PKIPackOBJECT_IDInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->bagType), PKIID_OBJECT_ID, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field bagContent of SafeBag */
    bytesused += PKIPutTag(buf+bytesused, 0xa0 | 0x00, PKISizeofANY(ctx, &(asnstruct->bagContent ), PKITRUE));
    bytesused += PKIPackANYInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->bagContent), PKIID_ANY, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field bagAttributes of SafeBag */
    if (asnstruct->bagAttributes != NULL) { /* optional */
        bytesused += PKIPackAttributesInternal(ctx, buf+bytesused, buflen-bytesused,
                          asnstruct->bagAttributes, PKIID_Attributes, 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;
} /* PKIPackSafeBagInternal */

size_t PKIUnpkInPlaceSafeBag(
    PKICONTEXT *ctx,
    PKISafeBag *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", "SafeBag" );

    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 bagType of SafeBag */
    bytesused += PKIUnpkInPlaceOBJECT_ID(ctx, &(asnstruct->bagType), buf+bytesused,
                        localsize-bytesused, PKIID_OBJECT_ID, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field bagContent of SafeBag */
    { /* local declaration block*/
        size_t taggeddatasize;
        size_t taggedlocalsize;
        size_t used;

        used = PKITakeTag(buf+bytesused, 0xa0 | 0x00,
                          &taggeddatasize);
        bytesused += used;

        if ((int)taggeddatasize == -1 && used != 0) {
            PKITRACE_PRINT_TAG(0xa0|0x00, 0x00);
            PKITRACE_INCR_LEVEL;
            bytesused += PKIUnpkInPlaceANY(ctx, &(asnstruct->bagContent), buf+bytesused,
                        localsize-bytesused, PKIID_ANY, erret);
            PKITRACE_DECR_LEVEL;
            if ( *(buf+bytesused) != 0x00 &&
                 *(buf+bytesused+1) != 0x00 ) {
                PKIERR(PKIErrUnpackInvalidEncoding);
                break;
            }
            bytesused += 2;
        }

        else if (taggeddatasize > 0 && used != 0) {
            taggedlocalsize = bytesused + taggeddatasize;
            PKITRACE_PRINT_TAG(0xa0|0x00, 0x00);
            PKITRACE_INCR_LEVEL;
            bytesused += PKIUnpkInPlaceANY(ctx, &(asnstruct->bagContent), buf+bytesused,
                        localsize-bytesused, PKIID_ANY, erret);
            PKITRACE_DECR_LEVEL;
            if (bytesused != taggedlocalsize) {
                PKIERR(PKIErrUnpackTaggedLth);
                break;
            }
        }
    } /* for the local declaration block */
    if (bytesused > localsize || *erret != 0)
        break;

    /* field bagAttributes of SafeBag */
    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->bagAttributes != NULL)
        PKIFreeAttributes(ctx, asnstruct->bagAttributes);
    bytesused += PKIUnpackAttributesInternal(ctx, &(asnstruct->bagAttributes),
                    buf+bytesused, localsize-bytesused, PKIID_Attributes, 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;
} /* PKIUnpkInPlaceSafeBag */

size_t PKIUnpackSafeBagInternal(
    PKICONTEXT *ctx,
    PKISafeBag **asnstruct,
    const unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKISafeBag *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 = PKINewSafeBag(ctx); /* carve a block for it */
    bytesused = PKIUnpkInPlaceSafeBag(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        if (local != NULL) PKIFreeSafeBag(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackSafeBagInternal */


/******************************************************************
 * Routines for SecretBag
 ******************************************************************/

size_t PKISizeofSecretBagInternal(
    PKISecretBag *asnstruct,
    int outerSizeFlag,
    int expTaggedFlag)
{
    size_t body_size = 0;

    if (asnstruct == NULL)
        return 0;

    body_size =
            PKISizeofOBJECT_IDInternal(&asnstruct->secretType, PKITRUE, PKIFALSE)
          + PKISizeofANYInternal(&asnstruct->secret, PKITRUE, PKITRUE) ;

    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;

} /* PKISizeofSecretBagInternal */

void PKIDropInPlaceSecretBag(
    PKICONTEXT *ctx,
    PKISecretBag *f)
{
    if (ctx == NULL)
        return;

    if (f == NULL) return ;
    PKIDropInPlaceOBJECT_ID(ctx, &(f->secretType));
    PKIDropInPlaceANY(ctx, &(f->secret));
} /* PKIDropInPlaceSecretBag */

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