Mozilla/mozilla/security/manager/ssl/src/nsCMS.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corp..
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s): David Drinan <ddrinan@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.h"
#include "nsCMS.h"
#include "nsNSSHelper.h"
#include "nsNSSCertificate.h"
#include "smime.h"
#include "cms.h"

#include "prlog.h"
#ifdef PR_LOGGING
extern PRLogModuleInfo* gPIPNSSLog;
#endif

NS_IMPL_THREADSAFE_ISUPPORTS1(nsHash, nsIHash)

nsHash::nsHash() : m_ctxt(nsnull)
{
  NS_INIT_ISUPPORTS();
}


nsHash::~nsHash()
{
  if (m_ctxt) {
    HASH_Destroy(m_ctxt);
  }
}

NS_IMETHODIMP nsHash::ResultLen(PRInt16 aAlg, PRUint32 * aLen)
{
  *aLen = HASH_ResultLen((HASH_HashType)aAlg);
  return NS_OK;
}

NS_IMETHODIMP nsHash::Create(PRInt16 aAlg)
{
  m_ctxt = HASH_Create((HASH_HashType)aAlg);
  if (m_ctxt == nsnull) {
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

NS_IMETHODIMP nsHash::Begin()
{
  HASH_Begin(m_ctxt);
  return NS_OK;
}

NS_IMETHODIMP nsHash::Update(unsigned char* aBuf, PRUint32 aLen)
{
  HASH_Update(m_ctxt, (const unsigned char*)aBuf, aLen);
  return NS_OK;
}

NS_IMETHODIMP nsHash::End(unsigned char* aBuf, PRUint32* aResultLen, PRUint32 aMaxResultLen)
{
  HASH_End(m_ctxt, aBuf, aResultLen, aMaxResultLen);
  return NS_OK;
}

NS_IMPL_THREADSAFE_ISUPPORTS1(nsCMSMessage, nsICMSMessage)

nsCMSMessage::nsCMSMessage()
{
  NS_INIT_ISUPPORTS();
  m_cmsMsg = nsnull;
}
nsCMSMessage::nsCMSMessage(NSSCMSMessage *aCMSMsg)
{
  NS_INIT_ISUPPORTS();
  m_cmsMsg = aCMSMsg;
}

nsCMSMessage::~nsCMSMessage()
{
  if (m_cmsMsg) {
    NSS_CMSMessage_Destroy(m_cmsMsg);
  }
}

NS_IMETHODIMP nsCMSMessage::VerifySignature()
{
  return CommonVerifySignature(nsnull, 0);
}

NSSCMSSignerInfo* nsCMSMessage::GetTopLevelSignerInfo()
{
  if (!m_cmsMsg)
    return nsnull;

  if (!NSS_CMSMessage_IsSigned(m_cmsMsg))
    return nsnull;

  NSSCMSContentInfo *cinfo = NSS_CMSMessage_ContentLevel(m_cmsMsg, 0);
  if (!cinfo)
    return nsnull;

  NSSCMSSignedData *sigd = (NSSCMSSignedData*)NSS_CMSContentInfo_GetContent(cinfo);
  if (!sigd)
    return nsnull;

  PR_ASSERT(NSS_CMSSignedData_SignerInfoCount(sigd) > 0);
  return NSS_CMSSignedData_GetSignerInfo(sigd, 0);
}

NS_IMETHODIMP nsCMSMessage::GetSignerEmailAddress(char * * aEmail)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::GetSignerEmailAddress\n"));
  NS_ENSURE_ARG(aEmail);

  NSSCMSSignerInfo *si = GetTopLevelSignerInfo();
  if (!si)
    return NS_ERROR_FAILURE;

  *aEmail = NSS_CMSSignerInfo_GetSignerEmailAddress(si);
  return NS_OK;
}

NS_IMETHODIMP nsCMSMessage::GetSignerCommonName(char ** aName)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::GetSignerCommonName\n"));
  NS_ENSURE_ARG(aName);

  NSSCMSSignerInfo *si = GetTopLevelSignerInfo();
  if (!si)
    return NS_ERROR_FAILURE;

  *aName = NSS_CMSSignerInfo_GetSignerCommonName(si);
  return NS_OK;
}

NS_IMETHODIMP nsCMSMessage::ContentIsEncrypted(PRBool *isEncrypted)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::ContentIsEncrypted\n"));
  NS_ENSURE_ARG(isEncrypted);

  if (!m_cmsMsg)
    return NS_ERROR_FAILURE;

  *isEncrypted = NSS_CMSMessage_IsEncrypted(m_cmsMsg);

  return NS_OK;
}

NS_IMETHODIMP nsCMSMessage::ContentIsSigned(PRBool *isSigned)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::ContentIsSigned\n"));
  NS_ENSURE_ARG(isSigned);

  if (!m_cmsMsg)
    return NS_ERROR_FAILURE;

  *isSigned = NSS_CMSMessage_IsSigned(m_cmsMsg);

  return NS_OK;
}

NS_IMETHODIMP nsCMSMessage::GetSignerCert(nsIX509Cert **scert)
{
  NSSCMSSignerInfo *si = GetTopLevelSignerInfo();
  if (!si)
    return NS_ERROR_FAILURE;

  if (si->cert) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::GetSignerCert got signer cert\n"));

    *scert = new nsNSSCertificate(si->cert);
    if (*scert) {
      (*scert)->AddRef();
    }
  }
  else {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::GetSignerCert no signer cert, do we have a cert list? %s\n",
      (si->certList != nsnull ? "yes" : "no") ));

    *scert = nsnull;
  }
  
  return NS_OK;
}

NS_IMETHODIMP nsCMSMessage::GetEncryptionCert(nsIX509Cert **ecert)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsCMSMessage::VerifyDetachedSignature(unsigned char* aDigestData, PRUint32 aDigestDataLen)
{
  if (!aDigestData || !aDigestDataLen)
    return NS_ERROR_FAILURE;

  return CommonVerifySignature(aDigestData, aDigestDataLen);
}

nsresult nsCMSMessage::CommonVerifySignature(unsigned char* aDigestData, PRUint32 aDigestDataLen)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature, content level count %d\n", NSS_CMSMessage_ContentLevelCount(m_cmsMsg)));
  NSSCMSContentInfo *cinfo = nsnull;
  NSSCMSSignedData *sigd = nsnull;
  NSSCMSSignerInfo *si;
  PRInt32 nsigners;
  nsresult rv = NS_ERROR_FAILURE;

  if (NSS_CMSMessage_IsSigned(m_cmsMsg) == PR_FALSE) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - not signed\n"));
    return NS_ERROR_CMS_VERIFY_NOT_SIGNED;
  } 

  cinfo = NSS_CMSMessage_ContentLevel(m_cmsMsg, 0);
  if (cinfo) {
    // I don't like this hard cast. We should check in some way, that we really have this type.
    sigd = (NSSCMSSignedData*)NSS_CMSContentInfo_GetContent(cinfo);
  }
  
  if (!sigd) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - no content info\n"));
    rv = NS_ERROR_CMS_VERIFY_NO_CONTENT_INFO;
    goto loser;
  }

  if (aDigestData && aDigestDataLen)
  {
    SECItem digest;
    digest.data = aDigestData;
    digest.len = aDigestDataLen;

    if (NSS_CMSSignedData_SetDigestValue(sigd, SEC_OID_SHA1, &digest)) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - bad digest\n"));
      rv = NS_ERROR_CMS_VERIFY_BAD_DIGEST;
      goto loser;
    }
  }

  // Import certs. Note that import failure is not a signature verification failure. //
  if (NSS_CMSSignedData_ImportCerts(sigd, CERT_GetDefaultCertDB(), certUsageEmailSigner, PR_TRUE) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - can not import certs\n"));
  }

  nsigners = NSS_CMSSignedData_SignerInfoCount(sigd);
  PR_ASSERT(nsigners > 0);
  si = NSS_CMSSignedData_GetSignerInfo(sigd, 0);

  // We verify the first signer info,  only //
  if (NSS_CMSSignedData_VerifySignerInfo(sigd, 0, CERT_GetDefaultCertDB(), certUsageEmailSigner) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - unable to verify signature\n"));

    if (NSSCMSVS_SigningCertNotFound == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - signing cert not found\n"));
      rv = NS_ERROR_CMS_VERIFY_NOCERT;
    }
    else if(NSSCMSVS_SigningCertNotTrusted == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - signing cert not trusted\n"));
      rv = NS_ERROR_CMS_VERIFY_UNTRUSTED;
    }
    else if(NSSCMSVS_Unverified == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - can not verify\n"));
      rv = NS_ERROR_CMS_VERIFY_ERROR_UNVERIFIED;
    }
    else if(NSSCMSVS_ProcessingError == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - processing error\n"));
      rv = NS_ERROR_CMS_VERIFY_ERROR_PROCESSING;
    }
    else if(NSSCMSVS_BadSignature == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - bad signature\n"));
      rv = NS_ERROR_CMS_VERIFY_BAD_SIGNATURE;
    }
    else if(NSSCMSVS_DigestMismatch == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - digest mismatch\n"));
      rv = NS_ERROR_CMS_VERIFY_DIGEST_MISMATCH;
    }
    else if(NSSCMSVS_SignatureAlgorithmUnknown == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - algo unknown\n"));
      rv = NS_ERROR_CMS_VERIFY_UNKNOWN_ALGO;
    }
    else if(NSSCMSVS_SignatureAlgorithmUnsupported == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - algo not supported\n"));
      rv = NS_ERROR_CMS_VERIFY_UNSUPPORTED_ALGO;
    }
    else if(NSSCMSVS_MalformedSignature == si->verificationStatus) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - malformed signature\n"));
      rv = NS_ERROR_CMS_VERIFY_MALFORMED_SIGNATURE;
    }

    goto loser;
  }

  // Save the profile. Note that save import failure is not a signature verification failure. //
  if (NSS_SMIMESignerInfo_SaveSMIMEProfile(si) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CommonVerifySignature - unable to save smime profile\n"));
  }

  rv = NS_OK;
loser:
  return rv;
}

NS_IMETHODIMP nsCMSMessage::CreateEncrypted(nsISupportsArray * aRecipientCerts)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted\n"));
  NSSCMSContentInfo *cinfo;
  NSSCMSEnvelopedData *envd;
  NSSCMSRecipientInfo *recipientInfo;
  CERTCertificate **recipientCerts;
  PLArenaPool *tmpPoolp = nsnull;
  SECOidTag bulkAlgTag;
  int keySize, i;
  nsNSSCertificate *nssRecipientCert;
  nsresult rv = NS_ERROR_FAILURE;

  // Check the recipient certificates //
  PRUint32 recipientCertCount;
  aRecipientCerts->Count(&recipientCertCount);
  PR_ASSERT(recipientCertCount > 0);

  if ((tmpPoolp = PORT_NewArena(1024)) == nsnull) {
    goto loser;
  }

  if ((recipientCerts = (CERTCertificate**)PORT_ArenaZAlloc(tmpPoolp,
                                           (recipientCertCount+1)*sizeof(CERTCertificate*)))
                                           == nsnull) {
    goto loser;
  }

  for (i=0; i<recipientCertCount; i++) {
    nssRecipientCert = NS_STATIC_CAST(nsNSSCertificate*, aRecipientCerts->ElementAt(i));
    recipientCerts[i] = nssRecipientCert->GetCert();
  }
  recipientCerts[i] = nsnull;

  // Find a bulk key algorithm //
  if (NSS_SMIMEUtil_FindBulkAlgForRecipients(recipientCerts, &bulkAlgTag,
                                            &keySize) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't find bulk alg for recipients\n"));
    rv = NS_ERROR_CMS_ENCRYPT_NO_BULK_ALG;
    goto loser;
  }

  m_cmsMsg = NSS_CMSMessage_Create(NULL);
  if (m_cmsMsg == nsnull) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't create new cms message\n"));
    rv = NS_ERROR_OUT_OF_MEMORY;
    goto loser;
  }

  if ((envd = NSS_CMSEnvelopedData_Create(m_cmsMsg, bulkAlgTag, keySize)) == nsnull) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't create enveloped data\n"));
    goto loser;
  }

  cinfo = NSS_CMSMessage_GetContentInfo(m_cmsMsg);
  if (NSS_CMSContentInfo_SetContent_EnvelopedData(m_cmsMsg, cinfo, envd) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't create content enveloped data\n"));
    goto loser;
  }

  cinfo = NSS_CMSEnvelopedData_GetContentInfo(envd);
  if (NSS_CMSContentInfo_SetContent_Data(m_cmsMsg, cinfo, nsnull, PR_FALSE) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't set content data\n"));
    goto loser;
  }

  // Create and attach recipient information //
  for (i=0; recipientCerts[i] != nsnull; i++) {
    if ((recipientInfo = NSS_CMSRecipientInfo_Create(m_cmsMsg, recipientCerts[i])) == nsnull) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't create recipient info\n"));
      goto loser;
    }
    if (NSS_CMSEnvelopedData_AddRecipient(envd, recipientInfo) != SECSuccess) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateEncrypted - can't add recipient info\n"));
      goto loser;
    }
  }

  if (tmpPoolp) {
    PORT_FreeArena(tmpPoolp, PR_FALSE);
  }

  return NS_OK;
loser:
  if (m_cmsMsg) {
    NSS_CMSMessage_Destroy(m_cmsMsg);
    m_cmsMsg = nsnull;
  }
  if (tmpPoolp) {
    PORT_FreeArena(tmpPoolp, PR_FALSE);
  }

  return rv;
}

NS_IMETHODIMP nsCMSMessage::CreateSigned(nsIX509Cert* aSigningCert, nsIX509Cert* aEncryptCert, unsigned char* aDigestData, PRUint32 aDigestDataLen)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned\n"));
  NSSCMSContentInfo *cinfo;
  NSSCMSSignedData *sigd;
  NSSCMSSignerInfo *signerinfo;
  CERTCertificate *scert, *ecert;
  nsresult rv = NS_ERROR_FAILURE;

  /* Get the certs */
  scert = NS_STATIC_CAST(nsNSSCertificate*, aSigningCert)->GetCert();
  ecert = NS_STATIC_CAST(nsNSSCertificate*, aEncryptCert)->GetCert();

  /*
   * create the message object
   */
  m_cmsMsg = NSS_CMSMessage_Create(NULL); /* create a message on its own pool */
  if (m_cmsMsg == NULL) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't create new message\n"));
    rv = NS_ERROR_OUT_OF_MEMORY;
    goto loser;
  }

  /*
   * build chain of objects: message->signedData->data
   */
  if ((sigd = NSS_CMSSignedData_Create(m_cmsMsg)) == NULL) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't create signed data\n"));
    goto loser;
  }
  cinfo = NSS_CMSMessage_GetContentInfo(m_cmsMsg);
  if (NSS_CMSContentInfo_SetContent_SignedData(m_cmsMsg, cinfo, sigd) 
          != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't set content signed data\n"));
    goto loser;
  }

  cinfo = NSS_CMSSignedData_GetContentInfo(sigd);

  /* we're always passing data in and detaching optionally */
  if (NSS_CMSContentInfo_SetContent_Data(m_cmsMsg, cinfo, nsnull, PR_TRUE) 
          != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't set content data\n"));
    goto loser;
  }

  /* 
   * create & attach signer information
   */
  if ((signerinfo = NSS_CMSSignerInfo_Create(m_cmsMsg, scert, SEC_OID_SHA1)) 
          == NULL) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't create signer info\n"));
    goto loser;
  }

  /* we want the cert chain included for this one */
  if (NSS_CMSSignerInfo_IncludeCerts(signerinfo, NSSCMSCM_CertChain, 
                                       certUsageEmailSigner) 
          != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't include signer cert chain\n"));
    goto loser;
  }

  if (NSS_CMSSignerInfo_AddSigningTime(signerinfo, PR_Now()) 
	      != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't add signing time\n"));
    goto loser;
  }

  if (NSS_CMSSignerInfo_AddSMIMECaps(signerinfo) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't add smime caps\n"));
    goto loser;
  }

  if (NSS_CMSSignerInfo_AddSMIMEEncKeyPrefs(signerinfo, ecert, 
	                                  CERT_GetDefaultCertDB())
	!= SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't add smime enc key prefs\n"));
    goto loser;
  }
  if (NSS_CMSSignedData_AddCertificate(sigd, ecert) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't add own encryption certificate\n"));
    goto loser;
  }

  if (NSS_CMSSignedData_AddSignerInfo(sigd, signerinfo) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't add signer info\n"));
    goto loser;
  }

  // Finally, add the pre-computed digest if passed in
  if (aDigestData) {
    SECItem digest;

    digest.data = aDigestData;
    digest.len = aDigestDataLen;

    if (NSS_CMSSignedData_SetDigestValue(sigd, SEC_OID_SHA1, &digest)) {
      PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSMessage::CreateSigned - can't set digest value\n"));
      goto loser;
    }
  }

  return NS_OK;
loser:
  if (m_cmsMsg) {
    NSS_CMSMessage_Destroy(m_cmsMsg);
    m_cmsMsg = nsnull;
  }
  return rv;
}

NS_IMPL_THREADSAFE_ISUPPORTS1(nsCMSDecoder, nsICMSDecoder)

nsCMSDecoder::nsCMSDecoder()
{
  NS_INIT_ISUPPORTS();
}

nsCMSDecoder::~nsCMSDecoder()
{
}

/* void start (in NSSCMSContentCallback cb, in voidPtr arg); */
NS_IMETHODIMP nsCMSDecoder::Start(NSSCMSContentCallback cb, void * arg)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSDecoder::Start\n"));
  m_ctx = new PipUIContext();

  m_dcx = NSS_CMSDecoder_Start(0, cb, arg, 0, m_ctx, 0, 0);
  if (!m_dcx) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSDecoder::Start - can't start decoder\n"));
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

/* void update (in string bug, in long len); */
NS_IMETHODIMP nsCMSDecoder::Update(const char *buf, PRInt32 len)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSDecoder::Update\n"));
  NSS_CMSDecoder_Update(m_dcx, (char *)buf, len);
  return NS_OK;
}

/* void finish (); */
NS_IMETHODIMP nsCMSDecoder::Finish(nsICMSMessage ** aCMSMsg)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSDecoder::Finish\n"));
  NSSCMSMessage *cmsMsg;
  cmsMsg = NSS_CMSDecoder_Finish(m_dcx);
  if (cmsMsg) {
    nsCOMPtr<nsICMSMessage> msg = new nsCMSMessage(cmsMsg);
    *aCMSMsg = msg;
    NS_ADDREF(*aCMSMsg);
  }
  return NS_OK;
}

NS_IMPL_THREADSAFE_ISUPPORTS1(nsCMSEncoder, nsICMSEncoder)

nsCMSEncoder::nsCMSEncoder()
{
  NS_INIT_ISUPPORTS();
}

nsCMSEncoder::~nsCMSEncoder()
{
}

/* void start (); */
NS_IMETHODIMP nsCMSEncoder::Start(nsICMSMessage *aMsg, NSSCMSContentCallback cb, void * arg)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Start\n"));
  nsCMSMessage *cmsMsg = NS_STATIC_CAST(nsCMSMessage*, aMsg);
  m_ctx = new PipUIContext();

  m_ecx = NSS_CMSEncoder_Start(cmsMsg->getCMS(), cb, arg, 0, 0, 0, m_ctx, 0, 0, 0, 0);
  if (m_ecx == nsnull) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Start - can't start encoder\n"));
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

/* void update (in string aBuf, in long aLen); */
NS_IMETHODIMP nsCMSEncoder::Update(const char *aBuf, PRInt32 aLen)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Update\n"));
  if (!m_ecx || NSS_CMSEncoder_Update(m_ecx, aBuf, aLen) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Update - can't update encoder\n"));
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

/* void finish (); */
NS_IMETHODIMP nsCMSEncoder::Finish()
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Finish\n"));
  if (!m_ecx || NSS_CMSEncoder_Finish(m_ecx) != SECSuccess) {
    PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Finish - can't finish encoder\n"));
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

/* void encode (in nsICMSMessage aMsg); */
NS_IMETHODIMP nsCMSEncoder::Encode(nsICMSMessage *aMsg)
{
  PR_LOG(gPIPNSSLog, PR_LOG_DEBUG, ("nsCMSEncoder::Encode\n"));
  return NS_ERROR_NOT_IMPLEMENTED;
}