pkcs7.c

vc环境下的pgp源码

    int *erret)
{
    size_t bytesused;
    PKIDigestAlgorithmIdentifiers *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 = PKINewDigestAlgorithmIdentifiers(ctx);	/* carve a block for it */
    bytesused = PKIUnpkInPlaceDigestAlgorithmIdentifiers(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        PKIFreeDigestAlgorithmIdentifiers(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackDigestAlgorithmIdentifiersInternal */


/******************************************************************
 * Routines for DigestInfo
 ******************************************************************/

size_t PKISizeofDigestInfoInternal(PKIDigestInfo *asnstruct, int outerSizeFlag, int expTaggedFlag)
{
    size_t body_size = 0;

    if (asnstruct == NULL)
        return 0;

    body_size =
            PKISizeofDigestAlgorithmIdentifierInternal(&asnstruct->digestAlgorithm, PKITRUE, PKIFALSE)
          + PKISizeofDigestInternal(&asnstruct->digest, 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;

} /* PKISizeofDigestInfoInternal */

void PKIDropInPlaceDigestInfo(
    PKICONTEXT *ctx,
    PKIDigestInfo *f)
{
    if (ctx == NULL)
        return;

    if (f == NULL) return ;
    PKIDropInPlaceDigestAlgorithmIdentifier(ctx, &(f->digestAlgorithm));
    PKIDropInPlaceDigest(ctx, &(f->digest));
} /* PKIDropInPlaceDigestInfo */

size_t PKIPackDigestInfoInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKIDigestInfo *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 = PKISizeofDigestInfo(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 digestAlgorithm of DigestInfo */
    bytesused += PKIPackDigestAlgorithmIdentifierInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->digestAlgorithm), PKIID_DigestAlgorithmIdentifier, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field digest of DigestInfo */
    bytesused += PKIPackDigestInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->digest), PKIID_Digest, 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;
} /* PKIPackDigestInfoInternal */

size_t PKIUnpkInPlaceDigestInfo(
    PKICONTEXT *ctx,
    PKIDigestInfo *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", "DigestInfo" );

    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 digestAlgorithm of DigestInfo */
    bytesused += PKIUnpkInPlaceDigestAlgorithmIdentifier(ctx, &(asnstruct->digestAlgorithm), buf+bytesused,
                        localsize-bytesused, PKIID_DigestAlgorithmIdentifier, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field digest of DigestInfo */
    bytesused += PKIUnpkInPlaceDigest(ctx, &(asnstruct->digest), buf+bytesused,
                        localsize-bytesused, PKIID_Digest, 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;
} /* PKIUnpkInPlaceDigestInfo */

size_t PKIUnpackDigestInfoInternal(
    PKICONTEXT *ctx,
    PKIDigestInfo **asnstruct,
    unsigned char *buf,
    size_t buflen,
    unsigned char tag,
    int *erret)
{
    size_t bytesused;
    PKIDigestInfo *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 = PKINewDigestInfo(ctx);	/* carve a block for it */
    bytesused = PKIUnpkInPlaceDigestInfo(ctx, local, buf, buflen, tag, erret);
    if (*erret != 0) {
        PKIFreeDigestInfo(ctx, local);
        return 0;
    }
    *asnstruct = local;
    return bytesused;
} /* PKIUnpackDigestInfoInternal */


/******************************************************************
 * Routines for EncryptedContentInfo
 ******************************************************************/

size_t PKISizeofEncryptedContentInfoInternal(PKIEncryptedContentInfo *asnstruct, int outerSizeFlag, int expTaggedFlag)
{
    size_t body_size = 0;

    if (asnstruct == NULL)
        return 0;

    body_size =
            PKISizeofContentTypeInternal(&asnstruct->contentType, PKITRUE, PKIFALSE)
          + PKISizeofContentEncryptionAlgorithmIdentifierInternal(&asnstruct->contentEncryptionAlgorithm, PKITRUE, PKIFALSE)
          + PKISizeofEncryptedContentInternal(asnstruct->encryptedContent, 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;

} /* PKISizeofEncryptedContentInfoInternal */

void PKIDropInPlaceEncryptedContentInfo(
    PKICONTEXT *ctx,
    PKIEncryptedContentInfo *f)
{
    if (ctx == NULL)
        return;

    if (f == NULL) return ;
    PKIDropInPlaceContentType(ctx, &(f->contentType));
    PKIDropInPlaceContentEncryptionAlgorithmIdentifier(ctx, &(f->contentEncryptionAlgorithm));
    PKIFreeEncryptedContent(ctx, f->encryptedContent);
    f->encryptedContent = NULL;
} /* PKIDropInPlaceEncryptedContentInfo */

size_t PKIPackEncryptedContentInfoInternal(
    PKICONTEXT *ctx,
    unsigned char *buf,
    size_t buflen,
    PKIEncryptedContentInfo *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 = PKISizeofEncryptedContentInfo(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 contentType of EncryptedContentInfo */
    bytesused += PKIPackContentTypeInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->contentType), PKIID_ContentType, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field contentEncryptionAlgorithm of EncryptedContentInfo */
    bytesused += PKIPackContentEncryptionAlgorithmIdentifierInternal(ctx, buf+bytesused, buflen-bytesused,
                       &(asnstruct->contentEncryptionAlgorithm), PKIID_ContentEncryptionAlgorithmIdentifier, erret);
    if (bytesused > datasize || *erret != 0)
        break;

    /* field encryptedContent of EncryptedContentInfo */
    if (asnstruct->encryptedContent != NULL) { /* optional */
        bytesused += PKIPackEncryptedContentInternal(ctx, buf+bytesused, buflen-bytesused,
                           asnstruct->encryptedContent, 0x80 | 0x00, 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;
} /* PKIPackEncryptedContentInfoInternal */

size_t PKIUnpkInPlaceEncryptedContentInfo(
    PKICONTEXT *ctx,
    PKIEncryptedContentInfo *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", "EncryptedContentInfo" );

    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 contentType of EncryptedContentInfo */
    bytesused += PKIUnpkInPlaceContentType(ctx, &(asnstruct->contentType), buf+bytesused,
                        localsize-bytesused, PKIID_ContentType, erret);
    if (bytesused > localsize || *erret != 0)
        break;

    /* field contentEncryptionAlgorithm of EncryptedContentInfo */
    bytesused += PKIUnpkInPlaceContentEncryptionAlgorithmIdentifier(ctx, &(asnstruct->contentEncryptionAlgorithm), buf+bytesused,
                        localsize-bytesused, PKIID_ContentEncryptionAlgorithmIdentifier, erret);