X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilccrypt%2Fsilchash.c;h=34aff02bb6adabed5f90f37855471eef3722963d;hb=40f8443d8d3a6577336ee66d18e04d9ac4d956bb;hp=18cf81bc4720f815b21464e1c0a5225a1eb22e29;hpb=318d79b391bf6288e3e28c840217a7097f3d0392;p=silc.git

diff --git a/lib/silccrypt/silchash.c b/lib/silccrypt/silchash.c
index 18cf81bc..34aff02b 100644
--- a/lib/silccrypt/silchash.c
+++ b/lib/silccrypt/silchash.c
@@ -2,200 +2,195 @@
 
   silchash.c
 
-  Author: Pekka Riikonen <priikone@poseidon.pspt.fi>
+  Author: Pekka Riikonen <priikone@silcnet.org>
 
-  Copyright (C) 1997 - 2000 Pekka Riikonen
+  Copyright (C) 1997 - 2005 Pekka Riikonen
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
-  (at your option) any later version.
-  
+  the Free Software Foundation; version 2 of the License.
+
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
 */
-/*
- * $Id$
- * $Log$
- * Revision 1.3  2000/07/10 05:35:43  priikone
- * 	Added fingerprint functions.
- *
- * Revision 1.2  2000/07/05 06:08:43  priikone
- * 	Global cosmetic change.
- *
- * Revision 1.1.1.1  2000/06/27 11:36:55  priikone
- * 	Imported from internal CVS/Added Log headers.
- *
- *
- */
-
-#include "silcincludes.h"
+/* $Id$ */
+
+#include "silc.h"
 
 #include "md5.h"
 #include "sha1.h"
+#include "sha256.h"
 
-/* List of all hash functions in SILC. You can dynamically add new hash
-   functions into the list. At the initialization of SILC this list is 
-   filled with the configured hash functions. */
-struct SilcHashListStruct {
+/* The main SILC hash structure. */
+struct SilcHashStruct {
   SilcHashObject *hash;
-  struct SilcHashListStruct *next;
+  void *context;
 };
 
+#ifndef SILC_EPOC
 /* List of dynamically registered hash functions. */
-struct SilcHashListStruct *silc_hash_list = NULL;
+SilcDList silc_hash_list = NULL;
+#endif /* SILC_EPOC */
 
-/* Statically declared list of hash functions. */
-SilcHashObject silc_hash_builtin_list[] = 
+/* Default hash functions for silc_hash_register_default(). */
+const SilcHashObject silc_default_hash[] =
 {
-  { "md5", 16, 64, silc_md5_init, silc_md5_update, silc_md5_final,
-    silc_md5_transform, silc_md5_context_len },
+  { "sha256", 32, 64, silc_sha256_init, silc_sha256_update, silc_sha256_final,
+    silc_sha256_transform, silc_sha256_context_len },
   { "sha1", 20, 64, silc_sha1_init, silc_sha1_update, silc_sha1_final,
     silc_sha1_transform, silc_sha1_context_len },
+  { "md5", 16, 64, silc_md5_init, silc_md5_update, silc_md5_final,
+    silc_md5_transform, silc_md5_context_len },
 
   { NULL, 0, 0, NULL, NULL, NULL, NULL, NULL }
 };
 
-/* Registers a ned hash function into the SILC. This function is used at
+/* Registers a new hash function into the SILC. This function is used at
    the initialization of the SILC. */
 
-int silc_hash_register(SilcHashObject *hash)
+SilcBool silc_hash_register(const SilcHashObject *hash)
 {
-  struct SilcHashListStruct *new, *h;
+#ifndef SILC_EPOC
+  SilcHashObject *new;
 
-  SILC_LOG_DEBUG(("Registering new hash function"));
+  SILC_LOG_DEBUG(("Registering new hash function `%s'", hash->name));
 
-  new = silc_calloc(1, sizeof(*new));
-  new->hash = silc_calloc(1, sizeof(*new->hash));
-
-  /* Set the pointers */
-  new->hash->name = silc_calloc(1, strlen(hash->name));
-  memcpy(new->hash->name, hash->name, strlen(hash->name));
-  new->hash->hash_len = hash->hash_len;
-  new->hash->block_len = hash->block_len;
-  new->hash->init = hash->init;
-  new->hash->update = hash->update;
-  new->hash->final = hash->final;
-  new->hash->context_len = hash->context_len;
-  new->next = NULL;
-
-  /* Add the new hash function to the list */
-  if (!silc_hash_list) {
-    silc_hash_list = new;
-    return TRUE;
-  }
-
-  h = silc_hash_list;
-  while (h) {
-    if (!h->next) {
-      h->next = new;
-      break;
+  /* Check for existing */
+  if (silc_hash_list) {
+    SilcHashObject *entry;
+    silc_dlist_start(silc_hash_list);
+    while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+      if (!strcmp(entry->name, hash->name))
+	return FALSE;
     }
-    h = h->next;
   }
 
+  new = silc_calloc(1, sizeof(*new));
+  new->name = strdup(hash->name);
+  new->hash_len = hash->hash_len;
+  new->block_len = hash->block_len;
+  new->init = hash->init;
+  new->update = hash->update;
+  new->final = hash->final;
+  new->transform = hash->transform;
+  new->context_len = hash->context_len;
+
+  /* Add to list */
+  if (silc_hash_list == NULL)
+    silc_hash_list = silc_dlist_init();
+  silc_dlist_add(silc_hash_list, new);
+
+#endif /* SILC_EPOC */
   return TRUE;
 }
 
 /* Unregister a hash function from the SILC. */
 
-int silc_hash_unregister(SilcHashObject *hash)
+SilcBool silc_hash_unregister(SilcHashObject *hash)
 {
-  struct SilcHashListStruct *h, *tmp;
+#ifndef SILC_EPOC
+  SilcHashObject *entry;
 
   SILC_LOG_DEBUG(("Unregistering hash function"));
 
-  h = silc_hash_list;
+  if (!silc_hash_list)
+    return FALSE;
 
-  /* Unregister all hash functions */
-  if (hash == SILC_ALL_HASH_FUNCTIONS) {
-    /* Unregister all ciphers */
-    while (h) {
-      tmp = h->next;
-      silc_free(h->hash->name);
-      silc_free(h);
-      h = tmp;
-    }
+  silc_dlist_start(silc_hash_list);
+  while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+    if (hash == SILC_ALL_HASH_FUNCTIONS || entry == hash) {
+      silc_dlist_del(silc_hash_list, entry);
+      silc_free(entry->name);
+      silc_free(entry);
 
-    return TRUE;
-  }
+      if (silc_dlist_count(silc_hash_list) == 0) {
+	silc_dlist_uninit(silc_hash_list);
+	silc_hash_list = NULL;
+      }
 
-  /* Unregister the hash function */
-  if (h->hash == hash) {
-    tmp = h->next;
-    silc_free(h->hash->name);
-    silc_free(h);
-    silc_hash_list = tmp;
-
-    return TRUE;
-  }
-
-  while (h) {
-    if (h->next->hash == hash) {
-      tmp = h->next->next;
-      silc_free(h->hash->name);
-      silc_free(h);
-      h->next = tmp;
       return TRUE;
     }
-
-    h = h->next;
   }
 
+#endif /* SILC_EPOC */
   return FALSE;
 }
 
+/* Function that registers all the default hash funcs (all builtin ones).
+   The application may use this to register the default hash funcs if
+   specific hash funcs in any specific order is not wanted. */
+
+SilcBool silc_hash_register_default(void)
+{
+#ifndef SILC_EPOC
+  int i;
+
+  for (i = 0; silc_default_hash[i].name; i++)
+    silc_hash_register(&(silc_default_hash[i]));
+
+#endif /* SILC_EPOC */
+  return TRUE;
+}
+
+SilcBool silc_hash_unregister_all(void)
+{
+#ifndef SILC_EPOC
+  SilcHashObject *entry;
+
+  if (!silc_hash_list)
+    return FALSE;
+
+  silc_dlist_start(silc_hash_list);
+  while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+    silc_hash_unregister(entry);
+    if (!silc_hash_list)
+      break;
+  }
+#endif /* SILC_EPOC */
+  return TRUE;
+}
+
 /* Allocates a new SilcHash object. New object is returned into new_hash
    argument. */
 
-int silc_hash_alloc(const unsigned char *name, SilcHash *new_hash)
+SilcBool silc_hash_alloc(const unsigned char *name, SilcHash *new_hash)
 {
-  struct SilcHashListStruct *h;
-  int i;
-  
-  SILC_LOG_DEBUG(("Allocating new hash object"));
+  SilcHashObject *entry = NULL;
 
-  /* Allocate the new object */
-  *new_hash = silc_calloc(1, sizeof(**new_hash));
+  SILC_LOG_DEBUG(("Allocating new hash object"));
 
+#ifndef SILC_EPOC
   if (silc_hash_list) {
-    h = silc_hash_list;
-    while (h) {
-      if (!strcmp(h->hash->name, name))
+    silc_dlist_start(silc_hash_list);
+    while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+      if (!strcmp(entry->name, name))
 	break;
-      h = h->next;
     }
+  }
+#else
+  {
+    /* On EPOC which don't have globals we check our constant hash list. */
+    int i;
+    for (i = 0; silc_default_hash[i].name; i++) {
+      if (!strcmp(silc_default_hash[i].name, name)) {
+	entry = (SilcHashObject *)&(silc_default_hash[i]);
+	break;
+      }
+    }
+  }
+#endif /* SILC_EPOC */
 
-    if (!h)
-      goto check_builtin;
-
-    /* Set the pointers */
-    (*new_hash)->hash = h->hash;
-    (*new_hash)->context = silc_calloc(1, h->hash->context_len());
-    (*new_hash)->make_hash = silc_hash_make;
-
+  if (entry) {
+    *new_hash = silc_calloc(1, sizeof(**new_hash));
+    (*new_hash)->hash = entry;
+    (*new_hash)->context = silc_calloc(1, entry->context_len());
     return TRUE;
   }
 
- check_builtin:
-  for (i = 0; silc_hash_builtin_list[i].name; i++)
-    if (!strcmp(silc_hash_builtin_list[i].name, name))
-      break;
-
-  if (silc_hash_builtin_list[i].name == NULL) {
-    silc_free(*new_hash);
-    return FALSE;
-  }
-  
-  /* Set the pointers */
-  (*new_hash)->hash = &silc_hash_builtin_list[i];
-  (*new_hash)->context = silc_calloc(1, (*new_hash)->hash->context_len());
-  (*new_hash)->make_hash = silc_hash_make;
-  
-  return TRUE;
+  return FALSE;
 }
 
 /* Free's the SilcHash object */
@@ -208,65 +203,88 @@ void silc_hash_free(SilcHash hash)
   }
 }
 
+/* Returns the length of the hash digest. */
+
+SilcUInt32 silc_hash_len(SilcHash hash)
+{
+  return hash->hash->hash_len;
+}
+
+/* Returns the block lenght of the hash. */
+
+SilcUInt32 silc_hash_block_len(SilcHash hash)
+{
+  return hash->hash->block_len;
+}
+
+/* Returns the name of the hash function */
+
+const char *silc_hash_get_name(SilcHash hash)
+{
+  return hash->hash->name;
+}
+
 /* Returns TRUE if hash algorithm `name' is supported. */
 
-int silc_hash_is_supported(const unsigned char *name)
+SilcBool silc_hash_is_supported(const unsigned char *name)
 {
-  struct SilcHashListStruct *h;
-  int i;
-  
-  if (silc_hash_list) {
-    h = silc_hash_list;
+#ifndef SILC_EPOC
+  SilcHashObject *entry;
 
-    while (h) {
-      if (!strcmp(h->hash->name, name))
+  if (silc_hash_list) {
+    silc_dlist_start(silc_hash_list);
+    while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+      if (!strcmp(entry->name, name))
 	return TRUE;
-      h = h->next;
     }
   }
-
-  for (i = 0; silc_hash_builtin_list[i].name; i++)
-    if (!strcmp(silc_hash_builtin_list[i].name, name))
-      return TRUE;
-
+#else
+  {
+    int i;
+    for (i = 0; silc_default_hash[i].name; i++)
+      if (!strcmp(silc_default_hash[i].name, name))
+	return TRUE;
+  }
+#endif /* SILC_EPOC */
   return FALSE;
 }
 
 /* Returns comma separated list of supported hash functions. */
 
-char *silc_hash_get_supported()
+char *silc_hash_get_supported(void)
 {
+  SilcHashObject *entry;
   char *list = NULL;
-  int i, len;
-  struct SilcHashListStruct *h;
+  int len = 0;
 
-  len = 0;
+#ifndef SILC_EPOC
   if (silc_hash_list) {
-    h = silc_hash_list;
-
-    while (h) {
-      len += strlen(h->hash->name);
+    silc_dlist_start(silc_hash_list);
+    while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
+      len += strlen(entry->name);
       list = silc_realloc(list, len + 1);
-      
-      memcpy(list + (len - strlen(h->hash->name)), 
-	     h->hash->name, strlen(h->hash->name));
+
+      memcpy(list + (len - strlen(entry->name)),
+	     entry->name, strlen(entry->name));
       memcpy(list + len, ",", 1);
       len++;
-      
-      h = h->next;
     }
   }
+#else
+  {
+    int i;
+    for (i = 0; silc_default_hash[i].name; i++) {
+      entry = (SilcHashObject *)&(silc_default_hash[i]);
+      len += strlen(entry->name);
+      list = silc_realloc(list, len + 1);
 
-  for (i = 0; silc_hash_builtin_list[i].name; i++) {
-    len += strlen(silc_hash_builtin_list[i].name);
-    list = silc_realloc(list, len + 1);
-    
-    memcpy(list + (len - strlen(silc_hash_builtin_list[i].name)), 
-	   silc_hash_builtin_list[i].name, 
-	   strlen(silc_hash_builtin_list[i].name));
-    memcpy(list + len, ",", 1);
-    len++;
+      memcpy(list + (len - strlen(entry->name)),
+	     entry->name, strlen(entry->name));
+      memcpy(list + len, ",", 1);
+      len++;
+    }
   }
+#endif /* SILC_EPOC */
 
   list[len - 1] = 0;
 
@@ -275,42 +293,126 @@ char *silc_hash_get_supported()
 
 /* Creates the hash value and returns it to the return_hash argument. */
 
-void silc_hash_make(SilcHash hash, const unsigned char *data, 
-		    unsigned int len, unsigned char *return_hash)
+void silc_hash_make(SilcHash hash, const unsigned char *data,
+		    SilcUInt32 len, unsigned char *return_hash)
+{
+  silc_hash_init(hash);
+  silc_hash_update(hash, data, len);
+  silc_hash_final(hash, return_hash);
+}
+
+void silc_hash_init(SilcHash hash)
 {
   hash->hash->init(hash->context);
-  hash->hash->update(hash->context, (unsigned char *)data, len);
+}
+
+void silc_hash_update(SilcHash hash, const unsigned char *data,
+		      SilcUInt32 data_len)
+{
+  hash->hash->update(hash->context, (unsigned char *)data, data_len);
+}
+
+void silc_hash_final(SilcHash hash, unsigned char *return_hash)
+{
   hash->hash->final(hash->context, return_hash);
 }
 
+void silc_hash_transform(SilcHash hash, SilcUInt32 *state,
+			 const unsigned char *data)
+{
+  hash->hash->transform(state, data);
+}
+
 /* Creates fingerprint of the data. If `hash' is NULL SHA1 is used as
-   default hash function. The returned fingerprint must be free's by the
+   default hash function. The returned fingerprint must be freed by the
    caller. */
 
 char *silc_hash_fingerprint(SilcHash hash, const unsigned char *data,
-			    unsigned int data_len)
+			    SilcUInt32 data_len)
 {
-  char fingerprint[64], *cp;
+  SilcHash new_hash = NULL;
   unsigned char h[32];
-  int i;
+  char *ret;
 
-  if (!hash)
-    silc_hash_alloc("sha1", &hash);
+  if (!hash) {
+    silc_hash_alloc("sha1", &new_hash);
+    hash = new_hash;
+  }
 
   silc_hash_make(hash, data, data_len, h);
-  
-  memset(fingerprint, 0, sizeof(fingerprint));
-  cp = fingerprint;
-  for (i = 0; i < hash->hash->hash_len; i++) {
-    snprintf(cp, sizeof(fingerprint), "%02X", h[i]);
-    cp += 2;
-    
-    if ((i + 1) % 2 == 0)
-      snprintf(cp++, sizeof(fingerprint), " ");
-
-    if ((i + 1) % 10 == 0)
-      snprintf(cp++, sizeof(fingerprint), " ");
+  ret = silc_fingerprint(h, hash->hash->hash_len);
+
+  if (new_hash != NULL)
+    silc_hash_free(new_hash);
+  return ret;
+}
+
+static const char vo[]= "aeiouy";
+static const char co[]= "bcdfghklmnprstvzx";
+
+/* Creates a babbleprint (Bubble Babble Encoding, developed by Antti
+   Huima (draft-huima-babble-01.txt)), by first computing real fingerprint
+   using `hash' or if NULL, then using SHA1, and then encoding the
+   fingerprint to the babbleprint. */
+
+char *silc_hash_babbleprint(SilcHash hash, const unsigned char *data,
+			    SilcUInt32 data_len)
+{
+  SilcHash new_hash = NULL;
+  char *babbleprint;
+  unsigned char hval[32];
+  unsigned int a, b, c, d, e, check;
+  int i, k, out_len;
+
+  if (!hash) {
+    silc_hash_alloc("sha1", &new_hash);
+    hash = new_hash;
+  }
+
+  /* Take fingerprint */
+  silc_hash_make(hash, data, data_len, hval);
+
+  /* Encode babbleprint */
+  out_len = (((hash->hash->hash_len + 1) / 2) + 1) * 6;
+  babbleprint = silc_calloc(out_len, sizeof(*babbleprint));
+  babbleprint[0] = co[16];
+
+  check = 1;
+  for (i = 0, k = 1; i < hash->hash->hash_len - 1; i += 2, k += 6) {
+    a = (((hval[i] >> 6) & 3) + check) % 6;
+    b = (hval[i] >> 2) & 15;
+    c = ((hval[i] & 3) + (check / 6)) % 6;
+    d = (hval[i + 1] >> 4) & 15;
+    e = hval[i + 1] & 15;
+
+    check = ((check * 5) + (hval[i] * 7) + hval[i + 1]) % 36;
+
+    babbleprint[k + 0] = vo[a];
+    babbleprint[k + 1] = co[b];
+    babbleprint[k + 2] = vo[c];
+    babbleprint[k + 3] = co[d];
+    babbleprint[k + 4] = '-';
+    babbleprint[k + 5] = co[e];
   }
-  
-  return strdup(fingerprint);
+
+  if ((hash->hash->hash_len % 2) != 0) {
+    a = (((hval[i] >> 6) & 3) + check) % 6;
+    b = (hval[i] >> 2) & 15;
+    c = ((hval[i] & 3) + (check / 6)) % 6;
+    babbleprint[k + 0] = vo[a];
+    babbleprint[k + 1] = co[b];
+    babbleprint[k + 2] = vo[c];
+  } else {
+    a = check % 6;
+    b = 16;
+    c = check / 6;
+    babbleprint[k + 0] = vo[a];
+    babbleprint[k + 1] = co[b];
+    babbleprint[k + 2] = vo[c];
+  }
+  babbleprint[k + 3] = co[16];
+
+  if (new_hash != NULL)
+    silc_hash_free(new_hash);
+  return babbleprint;
 }