Delete bundled copy of NSS and replace with README.

nss/lib/pkcs7/p7decode.c

Index: nss/lib/pkcs7/p7decode.c
diff --git a/nss/lib/pkcs7/p7decode.c b/nss/lib/pkcs7/p7decode.c
deleted file mode 100644
index 7a52d820383f5e6a37faf84a3ad50cd5126a05d7..0000000000000000000000000000000000000000
--- a/nss/lib/pkcs7/p7decode.c
+++ /dev/null
@@ -1,1929 +0,0 @@
-/* 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/. */
-
-/*
- * PKCS7 decoding, verification.
- */
-
-#include "p7local.h"
-
-#include "cert.h"
-				/* XXX do not want to have to include */
-#include "certdb.h"		/* certdb.h -- the trust stuff needed by */
-     				/* the add certificate code needs to get */
-                           	/* rewritten/abstracted and then this */
-      				/* include should be removed! */
-/*#include "cdbhdl.h" */
-#include "cryptohi.h"
-#include "key.h"
-#include "secasn1.h"
-#include "secitem.h"
-#include "secoid.h"
-#include "pk11func.h"
-#include "prtime.h"
-#include "secerr.h"
-#include "sechash.h"	/* for HASH_GetHashObject() */
-#include "secder.h"
-#include "secpkcs5.h"
-
-struct sec_pkcs7_decoder_worker {
-    int depth;
-    int digcnt;
-    void **digcxs;
-    const SECHashObject **digobjs;
-    sec_PKCS7CipherObject *decryptobj;
-    PRBool saw_contents;
-};
-
-struct SEC_PKCS7DecoderContextStr {
-    SEC_ASN1DecoderContext *dcx;
-    SEC_PKCS7ContentInfo *cinfo;
-    SEC_PKCS7DecoderContentCallback cb;
-    void *cb_arg;
-    SECKEYGetPasswordKey pwfn;
-    void *pwfn_arg;
-    struct sec_pkcs7_decoder_worker worker;
-    PLArenaPool *tmp_poolp;
-    int error;
-    SEC_PKCS7GetDecryptKeyCallback dkcb;
-    void *dkcb_arg;
-    SEC_PKCS7DecryptionAllowedCallback decrypt_allowed_cb;
-};
-
-/*
- * Handle one worker, decrypting and digesting the data as necessary.
- *
- * XXX If/when we support nested contents, this probably needs to be
- * revised somewhat to get passed the content-info (which unfortunately
- * can be two different types depending on whether it is encrypted or not)
- * corresponding to the given worker.
- */
-static void
-sec_pkcs7_decoder_work_data (SEC_PKCS7DecoderContext *p7dcx,
-			     struct sec_pkcs7_decoder_worker *worker,
-			     const unsigned char *data, unsigned long len,
-			     PRBool final)
-{
-    unsigned char *buf = NULL;
-    SECStatus rv;
-    int i;
-
-    /*
-     * We should really have data to process, or we should be trying
-     * to finish/flush the last block.  (This is an overly paranoid
-     * check since all callers are in this file and simple inspection
-     * proves they do it right.  But it could find a bug in future
-     * modifications/development, that is why it is here.)
-     */
-    PORT_Assert ((data != NULL && len) || final);
-
-    /*
-     * Decrypt this chunk.
-     *
-     * XXX If we get an error, we do not want to do the digest or callback,
-     * but we want to keep decoding.  Or maybe we want to stop decoding
-     * altogether if there is a callback, because obviously we are not
-     * sending the data back and they want to know that.
-     */
-    if (worker->decryptobj != NULL) {
-	/* XXX the following lengths should all be longs? */
-	unsigned int inlen;	/* length of data being decrypted */
-	unsigned int outlen;	/* length of decrypted data */
-	unsigned int buflen;	/* length available for decrypted data */
-	SECItem *plain;
-
-	inlen = len;
-	buflen = sec_PKCS7DecryptLength (worker->decryptobj, inlen, final);
-	if (buflen == 0) {
-	    if (inlen == 0)	/* no input and no output */
-		return;
-	    /*
-	     * No output is expected, but the input data may be buffered
-	     * so we still have to call Decrypt.
-	     */
-	    rv = sec_PKCS7Decrypt (worker->decryptobj, NULL, NULL, 0,
-				   data, inlen, final);
-	    if (rv != SECSuccess) {
-		p7dcx->error = PORT_GetError();
-		return;		/* XXX indicate error? */
-	    }
-	    return;
-	}
-
-	if (p7dcx->cb != NULL) {
-	    buf = (unsigned char *) PORT_Alloc (buflen);
-	    plain = NULL;
-	} else {
-	    unsigned long oldlen;
-
-	    /*
-	     * XXX This assumes one level of content only.
-	     * See comment above about nested content types.
-	     * XXX Also, it should work for signedAndEnvelopedData, too!
-	     */
-	    plain = &(p7dcx->cinfo->
-			content.envelopedData->encContentInfo.plainContent);
-
-	    oldlen = plain->len;
-	    if (oldlen == 0) {
-		buf = (unsigned char*)PORT_ArenaAlloc (p7dcx->cinfo->poolp, 
-						       buflen);
-	    } else {
-		buf = (unsigned char*)PORT_ArenaGrow (p7dcx->cinfo->poolp, 
-				      plain->data,
-				      oldlen, oldlen + buflen);
-		if (buf != NULL)
-		    buf += oldlen;
-	    }
-	    plain->data = buf;
-	}
-	if (buf == NULL) {
-	    p7dcx->error = SEC_ERROR_NO_MEMORY;
-	    return;		/* XXX indicate error? */
-	}
-	rv = sec_PKCS7Decrypt (worker->decryptobj, buf, &outlen, buflen,
-			       data, inlen, final);
-	if (rv != SECSuccess) {
-	    p7dcx->error = PORT_GetError();
-	    return;		/* XXX indicate error? */
-	}
-	if (plain != NULL) {
-	    PORT_Assert (final || outlen == buflen);
-	    plain->len += outlen;
-	}
-	data = buf;
-	len = outlen;
-    }
-
-    /*
-     * Update the running digests.
-     */
-    if (len) {
-	for (i = 0; i < worker->digcnt; i++) {
-	    (* worker->digobjs[i]->update) (worker->digcxs[i], data, len);
-	}
-    }
-
-    /*
-     * Pass back the contents bytes, and free the temporary buffer.
-     */
-    if (p7dcx->cb != NULL) {
-	if (len)
-	    (* p7dcx->cb) (p7dcx->cb_arg, (const char *)data, len);
-	if (worker->decryptobj != NULL) {
-	    PORT_Assert (buf != NULL);
-	    PORT_Free (buf);
-	}
-    }
-}
-
-static void
-sec_pkcs7_decoder_filter (void *arg, const char *data, unsigned long len,
-			  int depth, SEC_ASN1EncodingPart data_kind)
-{
-    SEC_PKCS7DecoderContext *p7dcx;
-    struct sec_pkcs7_decoder_worker *worker;
-
-    /*
-     * Since we do not handle any nested contents, the only bytes we
-     * are really interested in are the actual contents bytes (not
-     * the identifier, length, or end-of-contents bytes).  If we were
-     * handling nested types we would probably need to do something
-     * smarter based on depth and data_kind.
-     */
-    if (data_kind != SEC_ASN1_Contents)
-	return;
-
-    /*
-     * The ASN.1 decoder should not even call us with a length of 0.
-     * Just being paranoid.
-     */
-    PORT_Assert (len);
-    if (len == 0)
-	return;
-
-    p7dcx = (SEC_PKCS7DecoderContext*)arg;
-
-    /*
-     * Handling nested contents would mean that there is a chain
-     * of workers -- one per each level of content.  The following
-     * would start with the first worker and loop over them.
-     */
-    worker = &(p7dcx->worker);
-
-    worker->saw_contents = PR_TRUE;
-
-    sec_pkcs7_decoder_work_data (p7dcx, worker,
-				 (const unsigned char *) data, len, PR_FALSE);
-}
-
-
-/*
- * Create digest contexts for each algorithm in "digestalgs".
- * No algorithms is not an error, we just do not do anything.
- * An error (like trouble allocating memory), marks the error
- * in "p7dcx" and returns SECFailure, which means that our caller
- * should just give up altogether.
- */
-static SECStatus
-sec_pkcs7_decoder_start_digests (SEC_PKCS7DecoderContext *p7dcx, int depth,
-				 SECAlgorithmID **digestalgs)
-{
-    int i, digcnt;
-
-    if (digestalgs == NULL)
-	return SECSuccess;
-
-    /*
-     * Count the algorithms.
-     */
-    digcnt = 0;
-    while (digestalgs[digcnt] != NULL)
-	digcnt++;
-
-    /*
-     * No algorithms means no work to do.
-     * Just act as if there were no algorithms specified.
-     */
-    if (digcnt == 0)
-	return SECSuccess;
-
-    p7dcx->worker.digcxs = (void**)PORT_ArenaAlloc (p7dcx->tmp_poolp,
-					    digcnt * sizeof (void *));
-    p7dcx->worker.digobjs = (const SECHashObject**)PORT_ArenaAlloc (p7dcx->tmp_poolp,
-					     digcnt * sizeof (SECHashObject *));
-    if (p7dcx->worker.digcxs == NULL || p7dcx->worker.digobjs == NULL) {
-	p7dcx->error = SEC_ERROR_NO_MEMORY;
-	return SECFailure;
-    }
-
-    p7dcx->worker.depth = depth;
-    p7dcx->worker.digcnt = 0;
-
-    /*
-     * Create a digest context for each algorithm.
-     */
-    for (i = 0; i < digcnt; i++) {
-	SECAlgorithmID *     algid  = digestalgs[i];
-	SECOidTag            oidTag = SECOID_FindOIDTag(&(algid->algorithm));
-	const SECHashObject *digobj = HASH_GetHashObjectByOidTag(oidTag);
-	void *digcx;
-
-	/*
-	 * Skip any algorithm we do not even recognize; obviously,
-	 * this could be a problem, but if it is critical then the
-	 * result will just be that the signature does not verify.
-	 * We do not necessarily want to error out here, because
-	 * the particular algorithm may not actually be important,
-	 * but we cannot know that until later.
-	 */
-	if (digobj == NULL) {
-	    p7dcx->worker.digcnt--;
-	    continue;
-	}
-
-	digcx = (* digobj->create)();
-	if (digcx != NULL) {
-	    (* digobj->begin) (digcx);
-	    p7dcx->worker.digobjs[p7dcx->worker.digcnt] = digobj;
-	    p7dcx->worker.digcxs[p7dcx->worker.digcnt] = digcx;
-	    p7dcx->worker.digcnt++;
-	}
-    }
-
-    if (p7dcx->worker.digcnt != 0)
-	SEC_ASN1DecoderSetFilterProc (p7dcx->dcx,
-				      sec_pkcs7_decoder_filter,
-				      p7dcx,
-				      (PRBool)(p7dcx->cb != NULL));
-    return SECSuccess;
-}
-
-
-/*
- * Close out all of the digest contexts, storing the results in "digestsp".
- */
-static SECStatus
-sec_pkcs7_decoder_finish_digests (SEC_PKCS7DecoderContext *p7dcx,
-				  PLArenaPool *poolp,
-				  SECItem ***digestsp)
-{
-    struct sec_pkcs7_decoder_worker *worker;
-    const SECHashObject *digobj;
-    void *digcx;
-    SECItem **digests, *digest;
-    int i;
-    void *mark;
-
-    /*
-     * XXX Handling nested contents would mean that there is a chain
-     * of workers -- one per each level of content.  The following
-     * would want to find the last worker in the chain.
-     */
-    worker = &(p7dcx->worker);
-
-    /*
-     * If no digests, then we have nothing to do.
-     */
-    if (worker->digcnt == 0)
-	return SECSuccess;
-
-    /*
-     * No matter what happens after this, we want to stop filtering.
-     * XXX If we handle nested contents, we only want to stop filtering
-     * if we are finishing off the *last* worker.
-     */
-    SEC_ASN1DecoderClearFilterProc (p7dcx->dcx);
-
-    /*
-     * If we ended up with no contents, just destroy each
-     * digest context -- they are meaningless and potentially
-     * confusing, because their presence would imply some content
-     * was digested.
-     */
-    if (! worker->saw_contents) {
-	for (i = 0; i < worker->digcnt; i++) {
-	    digcx = worker->digcxs[i];
-	    digobj = worker->digobjs[i];
-	    (* digobj->destroy) (digcx, PR_TRUE);
-	}
-	return SECSuccess;
-    }
-
-    mark = PORT_ArenaMark (poolp);
-
-    /*
-     * Close out each digest context, saving digest away.
-     */
-    digests = 
-      (SECItem**)PORT_ArenaAlloc (poolp,(worker->digcnt+1)*sizeof(SECItem *));
-    digest = (SECItem*)PORT_ArenaAlloc (poolp, worker->digcnt*sizeof(SECItem));
-    if (digests == NULL || digest == NULL) {
-	p7dcx->error = PORT_GetError();
-	PORT_ArenaRelease (poolp, mark);
-	return SECFailure;
-    }
-
-    for (i = 0; i < worker->digcnt; i++, digest++) {
-	digcx = worker->digcxs[i];
-	digobj = worker->digobjs[i];
-
-	digest->data = (unsigned char*)PORT_ArenaAlloc (poolp, digobj->length);
-	if (digest->data == NULL) {
-	    p7dcx->error = PORT_GetError();
-	    PORT_ArenaRelease (poolp, mark);
-	    return SECFailure;
-	}
-
-	digest->len = digobj->length;
-	(* digobj->end) (digcx, digest->data, &(digest->len), digest->len);
-	(* digobj->destroy) (digcx, PR_TRUE);
-
-	digests[i] = digest;
-    }
-    digests[i] = NULL;
-    *digestsp = digests;
-
-    PORT_ArenaUnmark (poolp, mark);
-    return SECSuccess;
-}
-
-/*
- * XXX Need comment explaining following helper function (which is used
- * by sec_pkcs7_decoder_start_decrypt).
- */
-
-static PK11SymKey *
-sec_pkcs7_decoder_get_recipient_key (SEC_PKCS7DecoderContext *p7dcx,
-				     SEC_PKCS7RecipientInfo **recipientinfos,
-				     SEC_PKCS7EncryptedContentInfo *enccinfo)
-{
-    SEC_PKCS7RecipientInfo *ri;
-    CERTCertificate *cert = NULL;
-    SECKEYPrivateKey *privkey = NULL;
-    PK11SymKey *bulkkey = NULL;
-    SECOidTag keyalgtag, bulkalgtag, encalgtag;
-    PK11SlotInfo *slot = NULL;
-
-    if (recipientinfos == NULL || recipientinfos[0] == NULL) {
-	p7dcx->error = SEC_ERROR_NOT_A_RECIPIENT;
-	goto no_key_found;
-    }
-
-    cert = PK11_FindCertAndKeyByRecipientList(&slot,recipientinfos,&ri,
-						&privkey, p7dcx->pwfn_arg);
-    if (cert == NULL) {
-	p7dcx->error = SEC_ERROR_NOT_A_RECIPIENT;
-	goto no_key_found;
-    }
-
-    ri->cert = cert;		/* so we can find it later */
-    PORT_Assert(privkey != NULL);
-
-    keyalgtag = SECOID_GetAlgorithmTag(&(cert->subjectPublicKeyInfo.algorithm));
-    encalgtag = SECOID_GetAlgorithmTag (&(ri->keyEncAlg));
-    if (keyalgtag != encalgtag) {
-	p7dcx->error = SEC_ERROR_PKCS7_KEYALG_MISMATCH;
-	goto no_key_found;
-    }
-    bulkalgtag = SECOID_GetAlgorithmTag (&(enccinfo->contentEncAlg));
-
-    switch (encalgtag) {
-      case SEC_OID_PKCS1_RSA_ENCRYPTION:
-	bulkkey = PK11_PubUnwrapSymKey (privkey, &ri->encKey,
-					PK11_AlgtagToMechanism (bulkalgtag),
-					CKA_DECRYPT, 0);
-	if (bulkkey == NULL) {
-	    p7dcx->error = PORT_GetError();
-	    PORT_SetError(0);
-	    goto no_key_found;
-	}
-	break;
-      default:
-	p7dcx->error = SEC_ERROR_UNSUPPORTED_KEYALG;
-	break;
-    }
-
-no_key_found:
-    if (privkey != NULL)
-	SECKEY_DestroyPrivateKey (privkey);
-    if (slot != NULL)
-	PK11_FreeSlot(slot);
-
-    return bulkkey;
-}
- 
-/*
- * XXX The following comment is old -- the function used to only handle
- * EnvelopedData or SignedAndEnvelopedData but now handles EncryptedData
- * as well (and it had all of the code of the helper function above
- * built into it), though the comment was left as is.  Fix it...
- *
- * We are just about to decode the content of an EnvelopedData.
- * Set up a decryption context so we can decrypt as we go.
- * Presumably we are one of the recipients listed in "recipientinfos".
- * (XXX And if we are not, or if we have trouble, what should we do?
- *  It would be nice to let the decoding still work.  Maybe it should
- *  be an error if there is a content callback, but not an error otherwise?)
- * The encryption key and related information can be found in "enccinfo".
- */
-static SECStatus
-sec_pkcs7_decoder_start_decrypt (SEC_PKCS7DecoderContext *p7dcx, int depth,
-				 SEC_PKCS7RecipientInfo **recipientinfos,
-				 SEC_PKCS7EncryptedContentInfo *enccinfo,
-				 PK11SymKey **copy_key_for_signature)
-{
-    PK11SymKey *bulkkey = NULL;
-    sec_PKCS7CipherObject *decryptobj;
-
-    /*
-     * If a callback is supplied to retrieve the encryption key, 
-     * for instance, for Encrypted Content infos, then retrieve
-     * the bulkkey from the callback.  Otherwise, assume that
-     * we are processing Enveloped or SignedAndEnveloped data
-     * content infos.
-     *
-     * XXX Put an assert here?
-     */
-    if (SEC_PKCS7ContentType(p7dcx->cinfo) == SEC_OID_PKCS7_ENCRYPTED_DATA) {
-	if (p7dcx->dkcb != NULL) {
-	    bulkkey = (*p7dcx->dkcb)(p7dcx->dkcb_arg, 
-				     &(enccinfo->contentEncAlg));
-	}
-	enccinfo->keysize = 0;
-    } else {
-	bulkkey = sec_pkcs7_decoder_get_recipient_key (p7dcx, recipientinfos, 
-						       enccinfo);
-	if (bulkkey == NULL) goto no_decryption;
-	enccinfo->keysize = PK11_GetKeyStrength(bulkkey, 
-						&(enccinfo->contentEncAlg));
-
-    }
-
-    /*
-     * XXX I think following should set error in p7dcx and clear set error
-     * (as used to be done here, or as is done in get_receipient_key above.
-     */
-    if(bulkkey == NULL) {
-	goto no_decryption;
-    }
-    
-    /* 
-     * We want to make sure decryption is allowed.  This is done via
-     * a callback specified in SEC_PKCS7DecoderStart().
-     */
-    if (p7dcx->decrypt_allowed_cb) {
-	if ((*p7dcx->decrypt_allowed_cb) (&(enccinfo->contentEncAlg), 
-					  bulkkey) == PR_FALSE) {
-	    p7dcx->error = SEC_ERROR_DECRYPTION_DISALLOWED;
-	    goto no_decryption;
-	}
-    } else {
-	    p7dcx->error = SEC_ERROR_DECRYPTION_DISALLOWED;
-	    goto no_decryption;
-    }
-
-    /*
-     * When decrypting a signedAndEnvelopedData, the signature also has
-     * to be decrypted with the bulk encryption key; to avoid having to
-     * get it all over again later (and do another potentially expensive
-     * RSA operation), copy it for later signature verification to use.
-     */
-    if (copy_key_for_signature != NULL)
-	*copy_key_for_signature = PK11_ReferenceSymKey (bulkkey);
-
-    /*
-     * Now we have the bulk encryption key (in bulkkey) and the
-     * the algorithm (in enccinfo->contentEncAlg).  Using those,
-     * create a decryption context.
-     */
-    decryptobj = sec_PKCS7CreateDecryptObject (bulkkey,
-					       &(enccinfo->contentEncAlg));
-
-    /*
-     * We are done with (this) bulkkey now.
-     */
-    PK11_FreeSymKey (bulkkey);
-
-    if (decryptobj == NULL) {
-	p7dcx->error = PORT_GetError();
-	PORT_SetError(0);
-	goto no_decryption;
-    }
-
-    SEC_ASN1DecoderSetFilterProc (p7dcx->dcx,
-				  sec_pkcs7_decoder_filter,
-				  p7dcx,
-				  (PRBool)(p7dcx->cb != NULL));
-
-    p7dcx->worker.depth = depth;
-    p7dcx->worker.decryptobj = decryptobj;
-
-    return SECSuccess;
-
-no_decryption:
-    /*
-     * For some reason (error set already, if appropriate), we cannot
-     * decrypt the content.  I am not sure what exactly is the right
-     * thing to do here; in some cases we want to just stop, and in
-     * others we want to let the decoding finish even though we cannot
-     * decrypt the content.  My current thinking is that if the caller
-     * set up a content callback, then they are really interested in
-     * getting (decrypted) content, and if they cannot they will want
-     * to know about it.  However, if no callback was specified, then
-     * maybe it is not important that the decryption failed.
-     */
-    if (p7dcx->cb != NULL)
-	return SECFailure;
-    else
-	return SECSuccess;	/* Let the decoding continue. */
-}
-
-
-static SECStatus
-sec_pkcs7_decoder_finish_decrypt (SEC_PKCS7DecoderContext *p7dcx,
-				  PLArenaPool *poolp,
-				  SEC_PKCS7EncryptedContentInfo *enccinfo)
-{
-    struct sec_pkcs7_decoder_worker *worker;
-
-    /*
-     * XXX Handling nested contents would mean that there is a chain
-     * of workers -- one per each level of content.  The following
-     * would want to find the last worker in the chain.
-     */
-    worker = &(p7dcx->worker);
-
-    /*
-     * If no decryption context, then we have nothing to do.
-     */
-    if (worker->decryptobj == NULL)
-	return SECSuccess;
-
-    /*
-     * No matter what happens after this, we want to stop filtering.
-     * XXX If we handle nested contents, we only want to stop filtering
-     * if we are finishing off the *last* worker.
-     */
-    SEC_ASN1DecoderClearFilterProc (p7dcx->dcx);
-
-    /*
-     * Handle the last block.
-     */
-    sec_pkcs7_decoder_work_data (p7dcx, worker, NULL, 0, PR_TRUE);
-
-    /*
-     * All done, destroy it.
-     */
-    sec_PKCS7DestroyDecryptObject (worker->decryptobj);
-    worker->decryptobj = NULL;
-
-    return SECSuccess;
-}
-
-
-static void
-sec_pkcs7_decoder_notify (void *arg, PRBool before, void *dest, int depth)
-{
-    SEC_PKCS7DecoderContext *p7dcx;
-    SEC_PKCS7ContentInfo *cinfo;
-    SEC_PKCS7SignedData *sigd;
-    SEC_PKCS7EnvelopedData *envd;
-    SEC_PKCS7SignedAndEnvelopedData *saed;
-    SEC_PKCS7EncryptedData *encd;
-    SEC_PKCS7DigestedData *digd;
-    PRBool after;
-    SECStatus rv;
-
-    /*
-     * Just to make the code easier to read, create an "after" variable
-     * that is equivalent to "not before".
-     * (This used to be just the statement "after = !before", but that
-     * causes a warning on the mac; to avoid that, we do it the long way.)
-     */
-    if (before)
-	after = PR_FALSE;
-    else
-	after = PR_TRUE;
-
-    p7dcx = (SEC_PKCS7DecoderContext*)arg;
-    cinfo = p7dcx->cinfo;
-
-    if (cinfo->contentTypeTag == NULL) {
-	if (after && dest == &(cinfo->contentType))
-	    cinfo->contentTypeTag = SECOID_FindOID(&(cinfo->contentType));
-	return;
-    }
-
-    switch (cinfo->contentTypeTag->offset) {
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	sigd = cinfo->content.signedData;
-	if (sigd == NULL)
-	    break;
-
-	if (sigd->contentInfo.contentTypeTag == NULL) {
-	    if (after && dest == &(sigd->contentInfo.contentType))
-		sigd->contentInfo.contentTypeTag =
-			SECOID_FindOID(&(sigd->contentInfo.contentType));
-	    break;
-	}
-
-	/*
-	 * We only set up a filtering digest if the content is
-	 * plain DATA; anything else needs more work because a
-	 * second pass is required to produce a DER encoding from
-	 * an input that can be BER encoded.  (This is a requirement
-	 * of PKCS7 that is unfortunate, but there you have it.)
-	 *
-	 * XXX Also, since we stop here if this is not DATA, the
-	 * inner content is not getting processed at all.  Someday
-	 * we may want to fix that.
-	 */
-	if (sigd->contentInfo.contentTypeTag->offset != SEC_OID_PKCS7_DATA) {
-	    /* XXX Set an error in p7dcx->error */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	    break;
-	}
-
-	/*
-	 * Just before the content, we want to set up a digest context
-	 * for each digest algorithm listed, and start a filter which
-	 * will run all of the contents bytes through that digest.
-	 */
-	if (before && dest == &(sigd->contentInfo.content)) {
-	    rv = sec_pkcs7_decoder_start_digests (p7dcx, depth,
-						  sigd->digestAlgorithms);
-	    if (rv != SECSuccess)
-		SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-
-	    break;
-	}
-
-	/*
-	 * XXX To handle nested types, here is where we would want
-	 * to check for inner boundaries that need handling.
-	 */
-
-	/*
-	 * Are we done?
-	 */
-	if (after && dest == &(sigd->contentInfo.content)) {
-	    /*
-	     * Close out the digest contexts.  We ignore any error
-	     * because we are stopping anyway; the error status left
-	     * behind in p7dcx will be seen by outer functions.
-	     */
-	    (void) sec_pkcs7_decoder_finish_digests (p7dcx, cinfo->poolp,
-						     &(sigd->digests));
-
-	    /*
-	     * XXX To handle nested contents, we would need to remove
-	     * the worker from the chain (and free it).
-	     */
-
-	    /*
-	     * Stop notify.
-	     */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	}
-	break;
-
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-	envd = cinfo->content.envelopedData;
-	if (envd == NULL)
-	    break;
-
-	if (envd->encContentInfo.contentTypeTag == NULL) {
-	    if (after && dest == &(envd->encContentInfo.contentType))
-		envd->encContentInfo.contentTypeTag =
-			SECOID_FindOID(&(envd->encContentInfo.contentType));
-	    break;
-	}
-
-	/*
-	 * Just before the content, we want to set up a decryption
-	 * context, and start a filter which will run all of the
-	 * contents bytes through it to determine the plain content.
-	 */
-	if (before && dest == &(envd->encContentInfo.encContent)) {
-	    rv = sec_pkcs7_decoder_start_decrypt (p7dcx, depth,
-						  envd->recipientInfos,
-						  &(envd->encContentInfo),
-						  NULL);
-	    if (rv != SECSuccess)
-		SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-
-	    break;
-	}
-
-	/*
-	 * Are we done?
-	 */
-	if (after && dest == &(envd->encContentInfo.encContent)) {
-	    /*
-	     * Close out the decryption context.  We ignore any error
-	     * because we are stopping anyway; the error status left
-	     * behind in p7dcx will be seen by outer functions.
-	     */
-	    (void) sec_pkcs7_decoder_finish_decrypt (p7dcx, cinfo->poolp,
-						     &(envd->encContentInfo));
-
-	    /*
-	     * XXX To handle nested contents, we would need to remove
-	     * the worker from the chain (and free it).
-	     */
-
-	    /*
-	     * Stop notify.
-	     */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	}
-	break;
-
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	saed = cinfo->content.signedAndEnvelopedData;
-	if (saed == NULL)
-	    break;
-
-	if (saed->encContentInfo.contentTypeTag == NULL) {
-	    if (after && dest == &(saed->encContentInfo.contentType))
-		saed->encContentInfo.contentTypeTag =
-			SECOID_FindOID(&(saed->encContentInfo.contentType));
-	    break;
-	}
-
-	/*
-	 * Just before the content, we want to set up a decryption
-	 * context *and* digest contexts, and start a filter which
-	 * will run all of the contents bytes through both.
-	 */
-	if (before && dest == &(saed->encContentInfo.encContent)) {
-	    rv = sec_pkcs7_decoder_start_decrypt (p7dcx, depth,
-						  saed->recipientInfos,
-						  &(saed->encContentInfo),
-						  &(saed->sigKey));
-	    if (rv == SECSuccess)
-		rv = sec_pkcs7_decoder_start_digests (p7dcx, depth,
-						      saed->digestAlgorithms);
-	    if (rv != SECSuccess)
-		SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-
-	    break;
-	}
-
-	/*
-	 * Are we done?
-	 */
-	if (after && dest == &(saed->encContentInfo.encContent)) {
-	    /*
-	     * Close out the decryption and digests contexts.
-	     * We ignore any errors because we are stopping anyway;
-	     * the error status left behind in p7dcx will be seen by
-	     * outer functions.
-	     *
-	     * Note that the decrypt stuff must be called first;
-	     * it may have a last buffer to do which in turn has
-	     * to be added to the digest.
-	     */
-	    (void) sec_pkcs7_decoder_finish_decrypt (p7dcx, cinfo->poolp,
-						     &(saed->encContentInfo));
-	    (void) sec_pkcs7_decoder_finish_digests (p7dcx, cinfo->poolp,
-						     &(saed->digests));
-
-	    /*
-	     * XXX To handle nested contents, we would need to remove
-	     * the worker from the chain (and free it).
-	     */
-
-	    /*
-	     * Stop notify.
-	     */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	}
-	break;
-
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-	digd = cinfo->content.digestedData;
-	
-	/* 
-	 * XXX Want to do the digest or not?  Maybe future enhancement...
-	 */
-	if (before && dest == &(digd->contentInfo.content.data)) {
-	    SEC_ASN1DecoderSetFilterProc (p7dcx->dcx, sec_pkcs7_decoder_filter,
-					  p7dcx,
-					  (PRBool)(p7dcx->cb != NULL));
-	    break;
-	}
-
-	/*
-	 * Are we done?
-	 */
-	if (after && dest == &(digd->contentInfo.content.data)) {
-	    SEC_ASN1DecoderClearFilterProc (p7dcx->dcx);
-	}
-	break;
-
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	encd = cinfo->content.encryptedData;
-
-	/*
-	 * XXX If the decryption key callback is set, we want to start
-	 * the decryption.  If the callback is not set, we will treat the
-	 * content as plain data, since we do not have the key.
-	 *
-	 * Is this the proper thing to do?
-	 */
-	if (before && dest == &(encd->encContentInfo.encContent)) {
-	    /*
-	     * Start the encryption process if the decryption key callback
-	     * is present.  Otherwise, treat the content like plain data.
-	     */
-	    rv = SECSuccess;
-	    if (p7dcx->dkcb != NULL) {
-		rv = sec_pkcs7_decoder_start_decrypt (p7dcx, depth, NULL,
-						      &(encd->encContentInfo),
-						      NULL);
-	    }
-
-	    if (rv != SECSuccess)
-		SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-		
-	    break;
-	}
-
-	/*
-	 * Are we done?
-	 */
-	if (after && dest == &(encd->encContentInfo.encContent)) {
-	    /*
-	     * Close out the decryption context.  We ignore any error
-	     * because we are stopping anyway; the error status left
-	     * behind in p7dcx will be seen by outer functions.
-	     */
-	    (void) sec_pkcs7_decoder_finish_decrypt (p7dcx, cinfo->poolp,
-						     &(encd->encContentInfo));
-
-	    /*
-	     * Stop notify.
-	     */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	}
-	break;
-
-      case SEC_OID_PKCS7_DATA:
-	/*
-	 * If a output callback has been specified, we want to set the filter
-	 * to call the callback.  This is taken care of in 
-	 * sec_pkcs7_decoder_start_decrypt() or 
-	 * sec_pkcs7_decoder_start_digests() for the other content types.
-	 */ 
-	
-	if (before && dest == &(cinfo->content.data)) {
-
-	    /* 
-	     * Set the filter proc up.
-	     */
-	    SEC_ASN1DecoderSetFilterProc (p7dcx->dcx,
-					  sec_pkcs7_decoder_filter,
-					  p7dcx,
-					  (PRBool)(p7dcx->cb != NULL));
-	    break;
-	}
-
-	if (after && dest == &(cinfo->content.data)) {
-	    /*
-	     * Time to clean up after ourself, stop the Notify and Filter
-	     * procedures.
-	     */
-	    SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	    SEC_ASN1DecoderClearFilterProc (p7dcx->dcx);
-	}
-	break;
-
-      default:
-	SEC_ASN1DecoderClearNotifyProc (p7dcx->dcx);
-	break;
-    }
-}
-
-
-SEC_PKCS7DecoderContext *
-SEC_PKCS7DecoderStart(SEC_PKCS7DecoderContentCallback cb, void *cb_arg,
-		      SECKEYGetPasswordKey pwfn, void *pwfn_arg,
-		      SEC_PKCS7GetDecryptKeyCallback decrypt_key_cb, 
-		      void *decrypt_key_cb_arg,
-		      SEC_PKCS7DecryptionAllowedCallback decrypt_allowed_cb)
-{
-    SEC_PKCS7DecoderContext *p7dcx;
-    SEC_ASN1DecoderContext *dcx;
-    SEC_PKCS7ContentInfo *cinfo;
-    PLArenaPool *poolp;
-
-    poolp = PORT_NewArena (1024);		/* XXX what is right value? */
-    if (poolp == NULL)
-	return NULL;
-
-    cinfo = (SEC_PKCS7ContentInfo*)PORT_ArenaZAlloc (poolp, sizeof(*cinfo));
-    if (cinfo == NULL) {
-	PORT_FreeArena (poolp, PR_FALSE);
-	return NULL;
-    }
-
-    cinfo->poolp = poolp;
-    cinfo->pwfn = pwfn;
-    cinfo->pwfn_arg = pwfn_arg;
-    cinfo->created = PR_FALSE;
-    cinfo->refCount = 1;
-
-    p7dcx = 
-      (SEC_PKCS7DecoderContext*)PORT_ZAlloc (sizeof(SEC_PKCS7DecoderContext));
-    if (p7dcx == NULL) {
-	PORT_FreeArena (poolp, PR_FALSE);
-	return NULL;
-    }
-
-    p7dcx->tmp_poolp = PORT_NewArena (1024);	/* XXX what is right value? */
-    if (p7dcx->tmp_poolp == NULL) {
-	PORT_Free (p7dcx);
-	PORT_FreeArena (poolp, PR_FALSE);
-	return NULL;
-    }
-
-    dcx = SEC_ASN1DecoderStart (poolp, cinfo, sec_PKCS7ContentInfoTemplate);
-    if (dcx == NULL) {
-	PORT_FreeArena (p7dcx->tmp_poolp, PR_FALSE);
-	PORT_Free (p7dcx);
-	PORT_FreeArena (poolp, PR_FALSE);
-	return NULL;
-    }
-
-    SEC_ASN1DecoderSetNotifyProc (dcx, sec_pkcs7_decoder_notify, p7dcx);
-
-    p7dcx->dcx = dcx;
-    p7dcx->cinfo = cinfo;
-    p7dcx->cb = cb;
-    p7dcx->cb_arg = cb_arg;
-    p7dcx->pwfn = pwfn;
-    p7dcx->pwfn_arg = pwfn_arg;
-    p7dcx->dkcb = decrypt_key_cb;
-    p7dcx->dkcb_arg = decrypt_key_cb_arg;
-    p7dcx->decrypt_allowed_cb = decrypt_allowed_cb;
-
-    return p7dcx;
-}
-
-
-/*
- * Do the next chunk of PKCS7 decoding.  If there is a problem, set
- * an error and return a failure status.  Note that in the case of
- * an error, this routine is still prepared to be called again and
- * again in case that is the easiest route for our caller to take.
- * We simply detect it and do not do anything except keep setting
- * that error in case our caller has not noticed it yet...
- */
-SECStatus
-SEC_PKCS7DecoderUpdate(SEC_PKCS7DecoderContext *p7dcx,
-		       const char *buf, unsigned long len)
-{
-    if (p7dcx->cinfo != NULL && p7dcx->dcx != NULL) { 
-	PORT_Assert (p7dcx->error == 0);
-	if (p7dcx->error == 0) {
-	    if (SEC_ASN1DecoderUpdate (p7dcx->dcx, buf, len) != SECSuccess) {
-		p7dcx->error = PORT_GetError();
-		PORT_Assert (p7dcx->error);
-		if (p7dcx->error == 0)
-		    p7dcx->error = -1;
-	    }
-	}
-    }
-
-    if (p7dcx->error) {
-	if (p7dcx->dcx != NULL) {
-	    (void) SEC_ASN1DecoderFinish (p7dcx->dcx);
-	    p7dcx->dcx = NULL;
-	}
-	if (p7dcx->cinfo != NULL) {
-	    SEC_PKCS7DestroyContentInfo (p7dcx->cinfo);
-	    p7dcx->cinfo = NULL;
-	}
-	PORT_SetError (p7dcx->error);
-	return SECFailure;
-    }
-
-    return SECSuccess;
-}
-
-
-SEC_PKCS7ContentInfo *
-SEC_PKCS7DecoderFinish(SEC_PKCS7DecoderContext *p7dcx)
-{
-    SEC_PKCS7ContentInfo *cinfo;
-
-    cinfo = p7dcx->cinfo;
-    if (p7dcx->dcx != NULL) {
-	if (SEC_ASN1DecoderFinish (p7dcx->dcx) != SECSuccess) {
-	    SEC_PKCS7DestroyContentInfo (cinfo);
-	    cinfo = NULL;
-	}
-    }
-    /* free any NSS data structures */
-    if (p7dcx->worker.decryptobj) {
-        sec_PKCS7DestroyDecryptObject (p7dcx->worker.decryptobj);
-    }
-    PORT_FreeArena (p7dcx->tmp_poolp, PR_FALSE);
-    PORT_Free (p7dcx);
-    return cinfo;
-}
-
-
-SEC_PKCS7ContentInfo *
-SEC_PKCS7DecodeItem(SECItem *p7item,
-		    SEC_PKCS7DecoderContentCallback cb, void *cb_arg,
-		    SECKEYGetPasswordKey pwfn, void *pwfn_arg,
-		    SEC_PKCS7GetDecryptKeyCallback decrypt_key_cb, 
-		    void *decrypt_key_cb_arg,
-		    SEC_PKCS7DecryptionAllowedCallback decrypt_allowed_cb)
-{
-    SEC_PKCS7DecoderContext *p7dcx;
-
-    p7dcx = SEC_PKCS7DecoderStart(cb, cb_arg, pwfn, pwfn_arg, decrypt_key_cb,
-				  decrypt_key_cb_arg, decrypt_allowed_cb);
-    if (!p7dcx) {
-        /* error code is set */
-        return NULL;
-    }
-    (void) SEC_PKCS7DecoderUpdate(p7dcx, (char *) p7item->data, p7item->len);
-    return SEC_PKCS7DecoderFinish(p7dcx);
-}
-
-/*
- * Abort the ASN.1 stream. Used by pkcs 12
- */
-void
-SEC_PKCS7DecoderAbort(SEC_PKCS7DecoderContext *p7dcx, int error)
-{
-    PORT_Assert(p7dcx);
-    SEC_ASN1DecoderAbort(p7dcx->dcx, error);
-}
-
-
-/*
- * If the thing contains any certs or crls return true; false otherwise.
- */
-PRBool
-SEC_PKCS7ContainsCertsOrCrls(SEC_PKCS7ContentInfo *cinfo)
-{
-    SECOidTag kind;
-    SECItem **certs;
-    CERTSignedCrl **crls;
-
-    kind = SEC_PKCS7ContentType (cinfo);
-    switch (kind) {
-      default:
-      case SEC_OID_PKCS7_DATA:
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	return PR_FALSE;
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	certs = cinfo->content.signedData->rawCerts;
-	crls = cinfo->content.signedData->crls;
-	break;
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	certs = cinfo->content.signedAndEnvelopedData->rawCerts;
-	crls = cinfo->content.signedAndEnvelopedData->crls;
-	break;
-    }
-
-    /*
-     * I know this could be collapsed, but I was in a mood to be explicit.
-     */
-    if (certs != NULL && certs[0] != NULL)
-	return PR_TRUE;
-    else if (crls != NULL && crls[0] != NULL)
-	return PR_TRUE;
-    else
-	return PR_FALSE;
-}
-
-/* return the content length...could use GetContent, however we
- * need the encrypted content length 
- */
-PRBool
-SEC_PKCS7IsContentEmpty(SEC_PKCS7ContentInfo *cinfo, unsigned int minLen)
-{
-    SECItem *item = NULL;
-
-    if(cinfo == NULL) {
-	return PR_TRUE;
-    }
-
-    switch(SEC_PKCS7ContentType(cinfo)) 
-    {
-	case SEC_OID_PKCS7_DATA:
-	    item = cinfo->content.data;
-	    break;
-	case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	    item = &cinfo->content.encryptedData->encContentInfo.encContent;
-	    break;
-	default:
-	    /* add other types */
-	    return PR_FALSE;
-    }
-
-    if(!item) {
-	return PR_TRUE;
-    } else if(item->len <= minLen) {
-	return PR_TRUE;
-    }
-
-    return PR_FALSE;
-}
-
-
-PRBool
-SEC_PKCS7ContentIsEncrypted(SEC_PKCS7ContentInfo *cinfo)
-{
-    SECOidTag kind;
-
-    kind = SEC_PKCS7ContentType (cinfo);
-    switch (kind) {
-      default:
-      case SEC_OID_PKCS7_DATA:
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	return PR_FALSE;
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	return PR_TRUE;
-    }
-}
-
-
-/*
- * If the PKCS7 content has a signature (not just *could* have a signature)
- * return true; false otherwise.  This can/should be called before calling
- * VerifySignature, which will always indicate failure if no signature is
- * present, but that does not mean there even was a signature!
- * Note that the content itself can be empty (detached content was sent
- * another way); it is the presence of the signature that matters.
- */
-PRBool
-SEC_PKCS7ContentIsSigned(SEC_PKCS7ContentInfo *cinfo)
-{
-    SECOidTag kind;
-    SEC_PKCS7SignerInfo **signerinfos;
-
-    kind = SEC_PKCS7ContentType (cinfo);
-    switch (kind) {
-      default:
-      case SEC_OID_PKCS7_DATA:
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	return PR_FALSE;
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	signerinfos = cinfo->content.signedData->signerInfos;
-	break;
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	signerinfos = cinfo->content.signedAndEnvelopedData->signerInfos;
-	break;
-    }
-
-    /*
-     * I know this could be collapsed; but I kind of think it will get
-     * more complicated before I am finished, so...
-     */
-    if (signerinfos != NULL && signerinfos[0] != NULL)
-	return PR_TRUE;
-    else
-	return PR_FALSE;
-}
-
-
-/*
- * sec_pkcs7_verify_signature
- *
- *	Look at a PKCS7 contentInfo and check if the signature is good.
- *	The digest was either calculated earlier (and is stored in the
- *	contentInfo itself) or is passed in via "detached_digest".
- *
- *	The verification checks that the signing cert is valid and trusted
- *	for the purpose specified by "certusage" at
- * 	- "*atTime" if "atTime" is not null, or
- * 	- the signing time if the signing time is available in "cinfo", or
- *	- the current time (as returned by PR_Now).
- *
- *	In addition, if "keepcerts" is true, add any new certificates found
- *	into our local database.
- *
- * XXX Each place which returns PR_FALSE should be sure to have a good
- * error set for inspection by the caller.  Alternatively, we could create
- * an enumeration of success and each type of failure and return that
- * instead of a boolean.  For now, the default in a bad situation is to
- * set the error to SEC_ERROR_PKCS7_BAD_SIGNATURE.  But this should be
- * reviewed; better (more specific) errors should be possible (to distinguish
- * a signature failure from a badly-formed pkcs7 signedData, for example).
- * Some of the errors should probably just be SEC_ERROR_BAD_SIGNATURE,
- * but that has a less helpful error string associated with it right now;
- * if/when that changes, review and change these as needed.
- *
- * XXX This is broken wrt signedAndEnvelopedData.  In that case, the
- * message digest is doubly encrypted -- first encrypted with the signer
- * private key but then again encrypted with the bulk encryption key used
- * to encrypt the content.  So before we can pass the digest to VerifyDigest,
- * we need to decrypt it with the bulk encryption key.  Also, in this case,
- * there should be NO authenticatedAttributes (signerinfo->authAttr should
- * be NULL).
- */
-static PRBool
-sec_pkcs7_verify_signature(SEC_PKCS7ContentInfo *cinfo,
-			   SECCertUsage certusage,
-			   const SECItem *detached_digest,
-			   HASH_HashType digest_type,
-			   PRBool keepcerts,
-			   const PRTime *atTime)
-{
-    SECAlgorithmID **digestalgs, *bulkid;
-    const SECItem *digest;
-    SECItem **digests;
-    SECItem **rawcerts;
-    SEC_PKCS7SignerInfo **signerinfos, *signerinfo;
-    CERTCertificate *cert, **certs;
-    PRBool goodsig;
-    CERTCertDBHandle *certdb, *defaultdb; 
-    SECOidTag encTag,digestTag;
-    HASH_HashType found_type;
-    int i, certcount;
-    SECKEYPublicKey *publickey;
-    SECItem *content_type;
-    PK11SymKey *sigkey;
-    SECItem *encoded_stime;
-    PRTime stime;
-    PRTime verificationTime;
-    SECStatus rv;
-
-    /*
-     * Everything needed in order to "goto done" safely.
-     */
-    goodsig = PR_FALSE;
-    certcount = 0;
-    cert = NULL;
-    certs = NULL;
-    certdb = NULL;
-    defaultdb = CERT_GetDefaultCertDB();
-    publickey = NULL;
-
-    if (! SEC_PKCS7ContentIsSigned(cinfo)) {
-	PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	goto done;
-    }
-
-    PORT_Assert (cinfo->contentTypeTag != NULL);
-
-    switch (cinfo->contentTypeTag->offset) {
-      default:
-      case SEC_OID_PKCS7_DATA:
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	/* Could only get here if SEC_PKCS7ContentIsSigned is broken. */
-	PORT_Assert (0);
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	{
-	    SEC_PKCS7SignedData *sdp;
-
-	    sdp = cinfo->content.signedData;
-	    digestalgs = sdp->digestAlgorithms;
-	    digests = sdp->digests;
-	    rawcerts = sdp->rawCerts;
-	    signerinfos = sdp->signerInfos;
-	    content_type = &(sdp->contentInfo.contentType);
-	    sigkey = NULL;
-	    bulkid = NULL;
-	}
-	break;
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	{
-	    SEC_PKCS7SignedAndEnvelopedData *saedp;
-
-	    saedp = cinfo->content.signedAndEnvelopedData;
-	    digestalgs = saedp->digestAlgorithms;
-	    digests = saedp->digests;
-	    rawcerts = saedp->rawCerts;
-	    signerinfos = saedp->signerInfos;
-	    content_type = &(saedp->encContentInfo.contentType);
-	    sigkey = saedp->sigKey;
-	    bulkid = &(saedp->encContentInfo.contentEncAlg);
-	}
-	break;
-    }
-
-    if ((signerinfos == NULL) || (signerinfos[0] == NULL)) {
-	PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	goto done;
-    }
-
-    /*
-     * XXX Need to handle multiple signatures; checking them is easy,
-     * but what should be the semantics here (like, return value)?
-     */
-    if (signerinfos[1] != NULL) {
-	PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	goto done;
-    }
-
-    signerinfo = signerinfos[0];
-
-    /*
-     * XXX I would like to just pass the issuerAndSN, along with the rawcerts
-     * and crls, to some function that did all of this certificate stuff
-     * (open/close the database if necessary, verifying the certs, etc.)
-     * and gave me back a cert pointer if all was good.
-     */
-    certdb = defaultdb;
-    if (certdb == NULL) {
-	goto done;
-    }
-
-    certcount = 0;
-    if (rawcerts != NULL) {
-	for (; rawcerts[certcount] != NULL; certcount++) {
-	    /* just counting */
-	}
-    }
-
-    /*
-     * Note that the result of this is that each cert in "certs"
-     * needs to be destroyed.
-     */
-    rv = CERT_ImportCerts(certdb, certusage, certcount, rawcerts, &certs,
-			  keepcerts, PR_FALSE, NULL);
-    if ( rv != SECSuccess ) {
-	goto done;
-    }
-
-    /*
-     * This cert will also need to be freed, but since we save it
-     * in signerinfo for later, we do not want to destroy it when
-     * we leave this function -- we let the clean-up of the entire
-     * cinfo structure later do the destroy of this cert.
-     */
-    cert = CERT_FindCertByIssuerAndSN(certdb, signerinfo->issuerAndSN);
-    if (cert == NULL) {
-	goto done;
-    }
-
-    signerinfo->cert = cert;
-
-    /*
-     * Get and convert the signing time; if available, it will be used
-     * both on the cert verification and for importing the sender
-     * email profile.
-     */
-    encoded_stime = SEC_PKCS7GetSigningTime (cinfo);
-    if (encoded_stime != NULL) {
-	if (DER_DecodeTimeChoice (&stime, encoded_stime) != SECSuccess)
-	    encoded_stime = NULL;	/* conversion failed, so pretend none */
-    }
-
-    /*
-     * XXX  This uses the signing time, if available.  Additionally, we
-     * might want to, if there is no signing time, get the message time
-     * from the mail header itself, and use that.  That would require
-     * a change to our interface though, and for S/MIME callers to pass
-     * in a time (and for non-S/MIME callers to pass in nothing, or
-     * maybe make them pass in the current time, always?).
-     */
-    if (atTime) {
-	verificationTime = *atTime;
-    } else if (encoded_stime != NULL) {
-	verificationTime = stime;
-    } else {
-	verificationTime = PR_Now();
-    }
-    if (CERT_VerifyCert (certdb, cert, PR_TRUE, certusage, verificationTime,
-			 cinfo->pwfn_arg, NULL) != SECSuccess)
-	{
-	/*
-	 * XXX Give the user an option to check the signature anyway?
-	 * If we want to do this, need to give a way to leave and display
-	 * some dialog and get the answer and come back through (or do
-	 * the rest of what we do below elsewhere, maybe by putting it
-	 * in a function that we call below and could call from a dialog
-	 * finish handler).
-	 */
-	goto savecert;
-    }
-
-    publickey = CERT_ExtractPublicKey (cert);
-    if (publickey == NULL)
-	goto done;
-
-    /*
-     * XXX No!  If digests is empty, see if we can create it now by
-     * digesting the contents.  This is necessary if we want to allow
-     * somebody to do a simple decode (without filtering, etc.) and
-     * then later call us here to do the verification.
-     * OR, we can just specify that the interface to this routine
-     * *requires* that the digest(s) be done before calling and either
-     * stashed in the struct itself or passed in explicitly (as would
-     * be done for detached contents).
-     */
-    if ((digests == NULL || digests[0] == NULL)
-	&& (detached_digest == NULL || detached_digest->data == NULL))
-	goto done;
-
-    /*
-     * Find and confirm digest algorithm.
-     */
-    digestTag = SECOID_FindOIDTag(&(signerinfo->digestAlg.algorithm));
-
-    /* make sure we understand the digest type first */
-    found_type = HASH_GetHashTypeByOidTag(digestTag);
-    if ((digestTag == SEC_OID_UNKNOWN) || (found_type == HASH_AlgNULL)) {
-	PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	goto done;
-    }
-
-    if (detached_digest != NULL) {
-	unsigned int hashLen     = HASH_ResultLen(found_type);
-
-	if (digest_type != found_type || 
-	    detached_digest->len != hashLen) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-	digest = detached_digest;
-    } else {
-	PORT_Assert (digestalgs != NULL && digestalgs[0] != NULL);
-	if (digestalgs == NULL || digestalgs[0] == NULL) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	/*
-	 * pick digest matching signerinfo->digestAlg from digests
-	 */
-	for (i = 0; digestalgs[i] != NULL; i++) {
-	    if (SECOID_FindOIDTag(&(digestalgs[i]->algorithm)) == digestTag)
-		break;
-	}
-	if (digestalgs[i] == NULL) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	digest = digests[i];
-    }
-
-    encTag = SECOID_FindOIDTag(&(signerinfo->digestEncAlg.algorithm));
-    if (encTag == SEC_OID_UNKNOWN) {
-	PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	goto done;
-    }
-
-    if (signerinfo->authAttr != NULL) {
-	SEC_PKCS7Attribute *attr;
-	SECItem *value;
-	SECItem encoded_attrs;
-
-	/*
-	 * We have a sigkey only for signedAndEnvelopedData, which is
-	 * not supposed to have any authenticated attributes.
-	 */
-	if (sigkey != NULL) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	/*
-	 * PKCS #7 says that if there are any authenticated attributes,
-	 * then there must be one for content type which matches the
-	 * content type of the content being signed, and there must
-	 * be one for message digest which matches our message digest.
-	 * So check these things first.
-	 * XXX Might be nice to have a compare-attribute-value function
-	 * which could collapse the following nicely.
-	 */
-	attr = sec_PKCS7FindAttribute (signerinfo->authAttr,
-				       SEC_OID_PKCS9_CONTENT_TYPE, PR_TRUE);
-	value = sec_PKCS7AttributeValue (attr);
-	if (value == NULL || value->len != content_type->len) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-	if (PORT_Memcmp (value->data, content_type->data, value->len) != 0) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	attr = sec_PKCS7FindAttribute (signerinfo->authAttr,
-				       SEC_OID_PKCS9_MESSAGE_DIGEST, PR_TRUE);
-	value = sec_PKCS7AttributeValue (attr);
-	if (value == NULL || value->len != digest->len) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-	if (PORT_Memcmp (value->data, digest->data, value->len) != 0) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	/*
-	 * Okay, we met the constraints of the basic attributes.
-	 * Now check the signature, which is based on a digest of
-	 * the DER-encoded authenticated attributes.  So, first we
-	 * encode and then we digest/verify.
-	 */
-	encoded_attrs.data = NULL;
-	encoded_attrs.len = 0;
-	if (sec_PKCS7EncodeAttributes (NULL, &encoded_attrs,
-				       &(signerinfo->authAttr)) == NULL)
-	    goto done;
-
-	if (encoded_attrs.data == NULL || encoded_attrs.len == 0) {
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	goodsig = (PRBool)(VFY_VerifyDataDirect(encoded_attrs.data, 
-				   encoded_attrs.len,
-				   publickey, &(signerinfo->encDigest),
-				   encTag, digestTag, NULL,
-				   cinfo->pwfn_arg) == SECSuccess);
-	PORT_Free (encoded_attrs.data);
-    } else {
-	SECItem *sig;
-	SECItem holder;
-	SECStatus rv;
-
-	/*
-	 * No authenticated attributes.
-	 * The signature is based on the plain message digest.
-	 */
-
-	sig = &(signerinfo->encDigest);
-	if (sig->len == 0) {		/* bad signature */
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-	    goto done;
-	}
-
-	if (sigkey != NULL) {
-	    sec_PKCS7CipherObject *decryptobj;
-	    unsigned int buflen;
-
-	    /*
-	     * For signedAndEnvelopedData, we first must decrypt the encrypted
-	     * digest with the bulk encryption key.  The result is the normal
-	     * encrypted digest (aka the signature).
-	     */
-	    decryptobj = sec_PKCS7CreateDecryptObject (sigkey, bulkid);
-	    if (decryptobj == NULL)
-		goto done;
-
-	    buflen = sec_PKCS7DecryptLength (decryptobj, sig->len, PR_TRUE);
-	    PORT_Assert (buflen);
-	    if (buflen == 0) {		/* something is wrong */
-		sec_PKCS7DestroyDecryptObject (decryptobj);
-		goto done;
-	    }
-
-	    holder.data = (unsigned char*)PORT_Alloc (buflen);
-	    if (holder.data == NULL) {
-		sec_PKCS7DestroyDecryptObject (decryptobj);
-		goto done;
-	    }
-
-	    rv = sec_PKCS7Decrypt (decryptobj, holder.data, &holder.len, buflen,
-				   sig->data, sig->len, PR_TRUE);
-	    sec_PKCS7DestroyDecryptObject (decryptobj);
-	    if (rv != SECSuccess) {
-		goto done;
-	    }
-
-	    sig = &holder;
-	}
-
-	goodsig = (PRBool)(VFY_VerifyDigestDirect(digest, publickey, sig,
-				     encTag, digestTag, cinfo->pwfn_arg)
-                            == SECSuccess);
-
-	if (sigkey != NULL) {
-	    PORT_Assert (sig == &holder);
-	    PORT_ZFree (holder.data, holder.len);
-	}
-    }
-
-    if (! goodsig) {
-	/*
-	 * XXX Change the generic error into our specific one, because
-	 * in that case we get a better explanation out of the Security
-	 * Advisor.  This is really a bug in our error strings (the
-	 * "generic" error has a lousy/wrong message associated with it
-	 * which assumes the signature verification was done for the
-	 * purposes of checking the issuer signature on a certificate)
-	 * but this is at least an easy workaround and/or in the
-	 * Security Advisor, which specifically checks for the error
-	 * SEC_ERROR_PKCS7_BAD_SIGNATURE and gives more explanation
-	 * in that case but does not similarly check for
-	 * SEC_ERROR_BAD_SIGNATURE.  It probably should, but then would
-	 * probably say the wrong thing in the case that it *was* the
-	 * certificate signature check that failed during the cert
-	 * verification done above.  Our error handling is really a mess.
-	 */
-	if (PORT_GetError() == SEC_ERROR_BAD_SIGNATURE)
-	    PORT_SetError (SEC_ERROR_PKCS7_BAD_SIGNATURE);
-    }
-
-savecert:
-    /*
-     * Only save the smime profile if we are checking an email message and
-     * the cert has an email address in it.
-     */
-    if ( cert->emailAddr && cert->emailAddr[0] &&
-	( ( certusage == certUsageEmailSigner ) ||
-	 ( certusage == certUsageEmailRecipient ) ) ) {
-	SECItem *profile = NULL;
-	int save_error;
-
-	/*
-	 * Remember the current error set because we do not care about
-	 * anything set by the functions we are about to call.
-	 */
-	save_error = PORT_GetError();
-
-	if (goodsig && (signerinfo->authAttr != NULL)) {
-	    /*
-	     * If the signature is good, then we can save the S/MIME profile,
-	     * if we have one.
-	     */
-	    SEC_PKCS7Attribute *attr;
-
-	    attr = sec_PKCS7FindAttribute (signerinfo->authAttr,
-					   SEC_OID_PKCS9_SMIME_CAPABILITIES,
-					   PR_TRUE);
-	    profile = sec_PKCS7AttributeValue (attr);
-	}
-
-	rv = CERT_SaveSMimeProfile (cert, profile, encoded_stime);
-
-	/*
-	 * Restore the saved error in case the calls above set a new
-	 * one that we do not actually care about.
-	 */
-	PORT_SetError (save_error);
-
-	/*
-	 * XXX Failure is not indicated anywhere -- the signature
-	 * verification itself is unaffected by whether or not the
-	 * profile was successfully saved.
-	 */
-    }
-	
-
-done:
-
-    /*
-     * See comment above about why we do not want to destroy cert
-     * itself here.
-     */
-
-    if (certs != NULL)
-	CERT_DestroyCertArray (certs, certcount);
-
-    if (publickey != NULL)
-	SECKEY_DestroyPublicKey (publickey);
-
-    return goodsig;
-}
-
-/*
- * SEC_PKCS7VerifySignature
- *	Look at a PKCS7 contentInfo and check if the signature is good.
- *	The verification checks that the signing cert is valid and trusted
- *	for the purpose specified by "certusage".
- *
- *	In addition, if "keepcerts" is true, add any new certificates found
- *	into our local database.
- */
-PRBool
-SEC_PKCS7VerifySignature(SEC_PKCS7ContentInfo *cinfo,
-			 SECCertUsage certusage,
-			 PRBool keepcerts)
-{
-    return sec_pkcs7_verify_signature (cinfo, certusage,
-				       NULL, HASH_AlgNULL, keepcerts, NULL);
-}
-
-/*
- * SEC_PKCS7VerifyDetachedSignature
- *	Look at a PKCS7 contentInfo and check if the signature matches
- *	a passed-in digest (calculated, supposedly, from detached contents).
- *	The verification checks that the signing cert is valid and trusted
- *	for the purpose specified by "certusage".
- *
- *	In addition, if "keepcerts" is true, add any new certificates found
- *	into our local database.
- */
-PRBool
-SEC_PKCS7VerifyDetachedSignature(SEC_PKCS7ContentInfo *cinfo,
-				 SECCertUsage certusage,
-				 const SECItem *detached_digest,
-				 HASH_HashType digest_type,
-				 PRBool keepcerts)
-{
-    return sec_pkcs7_verify_signature (cinfo, certusage,
-				       detached_digest, digest_type,
-				       keepcerts, NULL);
-}
-
-/*
- * SEC_PKCS7VerifyDetachedSignatureAtTime
- *      Look at a PKCS7 contentInfo and check if the signature matches
- *      a passed-in digest (calculated, supposedly, from detached contents).
- *      The verification checks that the signing cert is valid and trusted
- *      for the purpose specified by "certusage" at time "atTime".
- *
- *	In addition, if "keepcerts" is true, add any new certificates found
- *	into our local database.
- */
-PRBool
-SEC_PKCS7VerifyDetachedSignatureAtTime(SEC_PKCS7ContentInfo *cinfo,
-				       SECCertUsage certusage,
-				       const SECItem *detached_digest,
-				       HASH_HashType digest_type,
-				       PRBool keepcerts,
-				       PRTime atTime)
-{
-    return sec_pkcs7_verify_signature (cinfo, certusage,
-				       detached_digest, digest_type,
-				       keepcerts, &atTime);
-}
-
-/*
- * Return the asked-for portion of the name of the signer of a PKCS7
- * signed object.
- *
- * Returns a pointer to allocated memory, which must be freed.
- * A NULL return value is an error.
- */
-
-#define sec_common_name 1
-#define sec_email_address 2
-
-static char *
-sec_pkcs7_get_signer_cert_info(SEC_PKCS7ContentInfo *cinfo, int selector)
-{
-    SECOidTag kind;
-    SEC_PKCS7SignerInfo **signerinfos;
-    CERTCertificate *signercert;
-    char *container;
-
-    kind = SEC_PKCS7ContentType (cinfo);
-    switch (kind) {
-      default:
-      case SEC_OID_PKCS7_DATA:
-      case SEC_OID_PKCS7_DIGESTED_DATA:
-      case SEC_OID_PKCS7_ENVELOPED_DATA:
-      case SEC_OID_PKCS7_ENCRYPTED_DATA:
-	PORT_Assert (0);
-	return NULL;
-      case SEC_OID_PKCS7_SIGNED_DATA:
-	{
-	    SEC_PKCS7SignedData *sdp;
-
-	    sdp = cinfo->content.signedData;
-	    signerinfos = sdp->signerInfos;
-	}
-	break;
-      case SEC_OID_PKCS7_SIGNED_ENVELOPED_DATA:
-	{
-	    SEC_PKCS7SignedAndEnvelopedData *saedp;
-
-	    saedp = cinfo->content.signedAndEnvelopedData;
-	    signerinfos = saedp->signerInfos;
-	}
-	break;
-    }
-
-    if (signerinfos == NULL || signerinfos[0] == NULL)
-	return NULL;
-
-    signercert = signerinfos[0]->cert;
-
-    /*
-     * No cert there; see if we can find one by calling verify ourselves.
-     */
-    if (signercert == NULL) {
-	/*
-	 * The cert usage does not matter in this case, because we do not
-	 * actually care about the verification itself, but we have to pick
-	 * some valid usage to pass in.
-	 */
-	(void) sec_pkcs7_verify_signature (cinfo, certUsageEmailSigner,
-					   NULL, HASH_AlgNULL, PR_FALSE, NULL);
-	signercert = signerinfos[0]->cert;
-	if (signercert == NULL)
-	    return NULL;
-    }
-
-    switch (selector) {
-      case sec_common_name:
-	container = CERT_GetCommonName (&signercert->subject);
-	break;
-      case sec_email_address:
-	if(signercert->emailAddr && signercert->emailAddr[0]) {
-	    container = PORT_Strdup(signercert->emailAddr);
-	} else {
-	    container = NULL;
-	}
-	break;
-      default:
-	PORT_Assert (0);
-	container = NULL;
-	break;
-    }
-
-    return container;
-}
-
-char *
-SEC_PKCS7GetSignerCommonName(SEC_PKCS7ContentInfo *cinfo)
-{
-    return sec_pkcs7_get_signer_cert_info(cinfo, sec_common_name);
-}
-
-char *
-SEC_PKCS7GetSignerEmailAddress(SEC_PKCS7ContentInfo *cinfo)
-{
-    return sec_pkcs7_get_signer_cert_info(cinfo, sec_email_address);
-}
-
-
-/*
- * Return the signing time, in UTCTime format, of a PKCS7 contentInfo.
- */
-SECItem *
-SEC_PKCS7GetSigningTime(SEC_PKCS7ContentInfo *cinfo)
-{
-    SEC_PKCS7SignerInfo **signerinfos;
-    SEC_PKCS7Attribute *attr;
-
-    if (SEC_PKCS7ContentType (cinfo) != SEC_OID_PKCS7_SIGNED_DATA)
-	return NULL;
-
-    signerinfos = cinfo->content.signedData->signerInfos;
-
-    /*
-     * No signature, or more than one, means no deal.
-     */
-    if (signerinfos == NULL || signerinfos[0] == NULL || signerinfos[1] != NULL)
-	return NULL;
-
-    attr = sec_PKCS7FindAttribute (signerinfos[0]->authAttr,
-				   SEC_OID_PKCS9_SIGNING_TIME, PR_TRUE);
-    return sec_PKCS7AttributeValue (attr);
-}