pkcs7.c

vc环境下的pgp源码

    PKIIssuerAndSerialNumber *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 = PKISizeofIssuerAndSerialNumber(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 issuer of IssuerAndSerialNumber */
    bytesused += PKIPackNameInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->issuer), PKIID_Name, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field serialNumber of IssuerAndSerialNumber */
    bytesused += PKIPackCertificateSerialNumberInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->serialNumber), PKIID_CertificateSerialNumber, 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;
} /* PKIPackIssuerAndSerialNumberInternal */

size_t PKIUnpkInPlaceIssuerAndSerialNumber(
    PKICONTEXT *ctx,
    PKIIssuerAndSerialNumber *asnstruct,
    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", "IssuerAndSerialNumber" );

    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 issuer of IssuerAndSerialNumber */
    bytesused += PKIUnpkInPlaceName(ctx, &(asnstruct->issuer), buf+bytesused,
                        localsize-bytesused, PKIID_Name, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field serialNumber of IssuerAndSerialNumber */
    bytesused += PKIUnpkInPlaceCertificateSerialNumber(ctx, &(asnstruct->serialNumber), buf+bytesused,
                        localsize-bytesused, PKIID_CertificateSerialNumber, 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;
} /* PKIUnpkInPlaceIssuerAndSerialNumber */

size_t PKIUnpackIssuerAndSerialNumberInternal(
    PKICONTEXT *ctx,
    PKIIssuerAndSerialNumber **asnstruct,
    unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKIIssuerAndSerialNumber *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 = PKINewIssuerAndSerialNumber(ctx);	/* carve a block for it */
    bytesused = PKIUnpkInPlaceIssuerAndSerialNumber(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        PKIFreeIssuerAndSerialNumber(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackIssuerAndSerialNumberInternal */


/******************************************************************
 * Routines for DigestAlgorithmIdentifiers
 ******************************************************************/

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

    if (asnstruct == NULL)
        return 0;

    lth = asnstruct->n;
    if (lth > PKIMAX_DigestAlgorithmIdentifiers)
        lth = PKIMAX_DigestAlgorithmIdentifiers;	/* clamp it */
    for (i=0;i<lth;i++)
        body_size += PKISizeofDigestAlgorithmIdentifierInternal((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;
} /* PKISizeofDigestAlgorithmIdentifiersInternal */

void PKIDropInPlaceDigestAlgorithmIdentifiers(
    PKICONTEXT *ctx,
    PKIDigestAlgorithmIdentifiers *f)
{
    long i, lth;

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

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

size_t PKIPackDigestAlgorithmIdentifiersInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKIDigestAlgorithmIdentifiers *asnstruct,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    size_t tagsize;
    size_t datasize;
    long numElem;
    int i, j;
    size_t length;
    size_t max = 0;
    PKIVariableBlock temp[PKIMAX_DigestAlgorithmIdentifiers];

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

    if (ctx == NULL) {
        PKIERR(PKIErrBadContext);
        return 0;
    }
    if (asnstruct == NULL) return 0; /* nothing to pack */

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

    datasize = PKISizeofDigestAlgorithmIdentifiers(ctx, asnstruct, PKIFALSE);
    tagsize = 1 + PKILengthSize(datasize);
    if (datasize+tagsize > buflen) {
        PKIERR(PKIErrPackBufferTooShort);
        return 0;
    }

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

    if (numElem == 1) {
        bytesused += PKIPackDigestAlgorithmIdentifierInternal(ctx, buf+bytesused, buflen-bytesused,
                           (asnstruct->elt)[0], PKIID_DigestAlgorithmIdentifier, erret);
    }

    else {

        /* calculate lengths and max */
        for (i=0; i<numElem; i++) {
            length = PKISizeofDigestAlgorithmIdentifier(ctx, (asnstruct->elt)[i], PKITRUE);
            if (length > max)
                max = length;
            temp[i].len = length;
        }

        /* temporarily allocate and pack */
        *erret = 0;
        for (i=0; i<numElem; i++) {
            temp[i].val = (unsigned char *)PKIAlloc(ctx->memMgr, max);
            memset(temp[i].val, 0, max);
            (void) PKIPackDigestAlgorithmIdentifierInternal(ctx, temp[i].val,
                          max, (asnstruct->elt)[i],
                          PKIID_DigestAlgorithmIdentifier, erret );
            if (*erret != 0) {
                for (j=0; j<i; j++)
                    PKIFree(ctx->memMgr, temp[j].val);
                return 0;
            }
        }

        /* sort and look for duplicates */
        qsort(temp, numElem, sizeof(PKIVariableBlock), PKICompareElems);
        for (i=0; i<(numElem-1); i++)
            if (memcmp(temp[i].val, temp[i+1].val, max) == 0) {
                PKIERR(PKIErrPackSETOFUnsortable);
                for (j=0; j<i; j++)
                    PKIFree(ctx->memMgr, temp[j].val);
                return 0;
            }

        /* pack for real and deallocate temp */
        for (i=0; i<numElem; i++) {
            (void)memcpy(buf+bytesused, temp[i].val, temp[i].len);
            bytesused += temp[i].len;
            if (bytesused > datasize)
                break;
            PKIFree(ctx->memMgr, temp[i].val);
        }
    }

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

    return bytesused;
} /* PKIPackDigestAlgorithmIdentifiersInternal */

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

    PKITRACE_PRINT_FN((tag|0x20), 0x31, "SET OF", "DigestAlgorithmIdentifiers");

    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;
    }

    PKITRACE_INCR_LEVEL;
    bytesused = 1; /* consume the tag byte */

    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_DigestAlgorithmIdentifiers) && (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] = PKINewDigestAlgorithmIdentifier(ctx);
        bytesused += PKIUnpkInPlaceDigestAlgorithmIdentifier(ctx, asnstruct->elt[i],
                          buf+bytesused, localsize-bytesused,
                          PKIID_DigestAlgorithmIdentifier, 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;
} /* PKIUnpkInPlaceDigestAlgorithmIdentifiers */

size_t PKIUnpackDigestAlgorithmIdentifiersInternal(
    PKICONTEXT *ctx,
    PKIDigestAlgorithmIdentifiers **asnstruct,
    unsigned char *buf,
    size_t buflen,
    unsigned char tag,