--- a/mailnews/mime/src/mimei.cpp
+++ b/mailnews/mime/src/mimei.cpp
@@ -676,16 +676,25 @@ mime_find_class (const char *content_typ
                   && micalg
                   && (!PL_strcasecmp(micalg, PARAM_MICALG_MD5) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_MD5_2) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_SHA1) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_2) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_3) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_4) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_5) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA256) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA256_2) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA256_3) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA384) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA384_2) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA384_3) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA512) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA512_2) ||
+                      !PL_strcasecmp(micalg, PARAM_MICALG_SHA512_3) ||
                       !PL_strcasecmp(micalg, PARAM_MICALG_MD2))))
             clazz = (MimeObjectClass *)&mimeMultipartSignedCMSClass;
           else
             clazz = 0;
         PR_FREEIF(proto);
         PR_FREEIF(micalg);
         PR_FREEIF(ct);
       }

--- a/mailnews/mime/src/mimemcms.cpp
+++ b/mailnews/mime/src/mimemcms.cpp
@@ -183,16 +183,28 @@ MimeMultCMS_init (MimeObject *obj)
       !PL_strcasecmp(micalg, PARAM_MICALG_MD5_2))
     hash_type = nsICryptoHash::MD5;
   else if (!PL_strcasecmp(micalg, PARAM_MICALG_SHA1) ||
        !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_2) ||
        !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_3) ||
        !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_4) ||
        !PL_strcasecmp(micalg, PARAM_MICALG_SHA1_5))
     hash_type = nsICryptoHash::SHA1;
+  else if (!PL_strcasecmp(micalg, PARAM_MICALG_SHA256) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA256_2) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA256_3))
+    hash_type = nsICryptoHash::SHA256;
+  else if (!PL_strcasecmp(micalg, PARAM_MICALG_SHA384) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA384_2) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA384_3))
+    hash_type = nsICryptoHash::SHA384;
+  else if (!PL_strcasecmp(micalg, PARAM_MICALG_SHA512) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA512_2) ||
+       !PL_strcasecmp(micalg, PARAM_MICALG_SHA512_3))
+    hash_type = nsICryptoHash::SHA512;
   else if (!PL_strcasecmp(micalg, PARAM_MICALG_MD2))
     hash_type = nsICryptoHash::MD2;
   else
     hash_type = -1;
 
   PR_Free(micalg);
   micalg = 0;
 

--- a/mailnews/mime/src/mimemcms.h
+++ b/mailnews/mime/src/mimemcms.h
@@ -35,16 +35,29 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
 #ifndef _MIMEMPKC_H_
 #define _MIMEMPKC_H_
 
 #include "mimemsig.h"
 
+#ifdef MOZILLA_1_9_2_BRANCH
+// On trunk these are defined in nsMimeTypes.h
+#define PARAM_MICALG_SHA256                 "sha-256"
+#define PARAM_MICALG_SHA256_2               "sha256"
+#define PARAM_MICALG_SHA256_3               "2.16.840.1.101.3.4.2.1"
+#define PARAM_MICALG_SHA384                 "sha-384"
+#define PARAM_MICALG_SHA384_2               "sha384"
+#define PARAM_MICALG_SHA384_3               "2.16.840.1.101.3.4.2.2"
+#define PARAM_MICALG_SHA512                 "sha-512"
+#define PARAM_MICALG_SHA512_2               "sha512"
+#define PARAM_MICALG_SHA512_3               "2.16.840.1.101.3.4.2.3"
+#endif
+
 class nsICMSMessage;
 
 /* The MimeMultipartSignedCMS class implements a multipart/signed MIME 
    container with protocol=application/x-CMS-signature, which passes the
    signed object through CMS code to verify the signature.  See mimemsig.h
    for details of the general mechanism on which this is built.
  */