/*
- silchmac.c
+ silchmac.c
Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1999 - 2001 Pekka Riikonen
+ Copyright (C) 1999 - 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
*/
/* $Id$ */
-#include "silcincludes.h"
+#include "silc.h"
/* HMAC context */
struct SilcHmacStruct {
SilcHmacObject *hmac;
SilcHash hash;
- bool allocated_hash; /* TRUE if the hash was allocated */
-
- unsigned char *key;
- SilcUInt32 key_len;
-
unsigned char inner_pad[64];
unsigned char outer_pad[64];
- void *hash_context;
+ unsigned char *key;
+ unsigned int key_len : 31;
+ unsigned int allocated_hash : 1; /* TRUE if the hash was allocated */
};
#ifndef SILC_EPOC
/* Default hmacs for silc_hmac_register_default(). */
const SilcHmacObject silc_default_hmacs[] =
{
+ { "hmac-sha256-96", 12 },
{ "hmac-sha1-96", 12 },
{ "hmac-md5-96", 12 },
+ { "hmac-sha256", 32 },
{ "hmac-sha1", 20 },
{ "hmac-md5", 16 },
SilcUInt32 key_len)
{
SilcHash hash = hmac->hash;
- unsigned char hvalue[20];
+ SilcUInt32 block_len;
+ unsigned char hvalue[SILC_HASH_MAXLEN];
int i;
memset(hmac->inner_pad, 0, sizeof(hmac->inner_pad));
memset(hmac->outer_pad, 0, sizeof(hmac->outer_pad));
+ block_len = silc_hash_block_len(hash);
+
/* If the key length is more than block size of the hash function, the
key is hashed. */
- if (key_len > hash->hash->block_len) {
+ if (key_len > block_len) {
silc_hash_make(hash, key, key_len, hvalue);
key = hvalue;
- key_len = hash->hash->hash_len;
+ key_len = silc_hash_len(hash);
}
/* Copy the key into the pads */
memcpy(hmac->outer_pad, key, key_len);
/* XOR the key with pads */
- for (i = 0; i < hash->hash->block_len; i++) {
+ for (i = 0; i < block_len; i++) {
hmac->inner_pad[i] ^= 0x36;
hmac->outer_pad[i] ^= 0x5c;
}
/* Registers a new HMAC into the SILC. This function is used at the
initialization of the SILC. */
-bool silc_hmac_register(const SilcHmacObject *hmac)
+SilcBool silc_hmac_register(const SilcHmacObject *hmac)
{
#ifndef SILC_EPOC
SilcHmacObject *new;
/* Unregister a HMAC from the SILC. */
-bool silc_hmac_unregister(SilcHmacObject *hmac)
+SilcBool silc_hmac_unregister(SilcHmacObject *hmac)
{
#ifndef SILC_EPOC
SilcHmacObject *entry;
while ((entry = silc_dlist_get(silc_hmac_list)) != SILC_LIST_END) {
if (hmac == SILC_ALL_HMACS || entry == hmac) {
silc_dlist_del(silc_hmac_list, entry);
+ silc_free(entry->name);
+ silc_free(entry);
if (silc_dlist_count(silc_hmac_list) == 0) {
silc_dlist_uninit(silc_hmac_list);
return FALSE;
}
-/* Function that registers all the default hmacs (all builtin ones).
+/* Function that registers all the default hmacs (all builtin ones).
The application may use this to register the default hmacs if
specific hmacs in any specific order is not wanted. */
-bool silc_hmac_register_default(void)
+SilcBool silc_hmac_register_default(void)
{
#ifndef SILC_EPOC
int i;
return TRUE;
}
+SilcBool silc_hmac_unregister_all(void)
+{
+#ifndef SILC_EPOC
+ SilcHmacObject *entry;
+
+ if (!silc_hmac_list)
+ return FALSE;
+
+ silc_dlist_start(silc_hmac_list);
+ while ((entry = silc_dlist_get(silc_hmac_list)) != SILC_LIST_END) {
+ silc_hmac_unregister(entry);
+ if (!silc_hmac_list)
+ break;
+ }
+#endif /* SILC_EPOC */
+ return TRUE;
+}
+
/* Allocates a new SilcHmac object of name of `name'. The `hash' may
be provided as argument. If provided it is used as the hash function
of the HMAC. If it is NULL then the hash function is allocated and
the name of the hash algorithm is derived from the `name'. */
-bool silc_hmac_alloc(char *name, SilcHash hash, SilcHmac *new_hmac)
+SilcBool silc_hmac_alloc(const char *name, SilcHash hash, SilcHmac *new_hmac)
{
SILC_LOG_DEBUG(("Allocating new HMAC"));
silc_dlist_start(silc_hmac_list);
while ((entry = silc_dlist_get(silc_hmac_list)) != SILC_LIST_END) {
if (!strcmp(entry->name, name)) {
- (*new_hmac)->hmac = entry;
+ (*new_hmac)->hmac = entry;
return TRUE;
}
}
silc_free(hmac->key);
}
- silc_free(hmac->hash_context);
silc_free(hmac);
}
}
/* Returns TRUE if HMAC `name' is supported. */
-bool silc_hmac_is_supported(const char *name)
+SilcBool silc_hmac_is_supported(const char *name)
{
#ifndef SILC_EPOC
SilcHmacObject *entry;
if (!name)
return FALSE;
-
+
if (silc_hmac_list) {
silc_dlist_start(silc_hmac_list);
while ((entry = silc_dlist_get(silc_hmac_list)) != SILC_LIST_END) {
while ((entry = silc_dlist_get(silc_hmac_list)) != SILC_LIST_END) {
len += strlen(entry->name);
list = silc_realloc(list, len + 1);
-
- memcpy(list + (len - strlen(entry->name)),
+
+ memcpy(list + (len - strlen(entry->name)),
entry->name, strlen(entry->name));
memcpy(list + len, ",", 1);
len++;
entry = (SilcHmacObject *)&(silc_default_hmacs[i]);
len += strlen(entry->name);
list = silc_realloc(list, len + 1);
-
- memcpy(list + (len - strlen(entry->name)),
+
+ memcpy(list + (len - strlen(entry->name)),
entry->name, strlen(entry->name));
memcpy(list + len, ",", 1);
len++;
key. The key is sent as argument to the function. */
void silc_hmac_make_with_key(SilcHmac hmac, unsigned char *data,
- SilcUInt32 data_len,
+ SilcUInt32 data_len,
unsigned char *key, SilcUInt32 key_len,
unsigned char *return_hash,
SilcUInt32 *return_len)
/* Creates the HMAC just as above except that the hash value is truncated
to the truncated_len sent as argument. NOTE: One should not truncate to
- less than half of the length of original hash value. However, this
+ less than half of the length of original hash value. However, this
routine allows these dangerous truncations. */
void silc_hmac_make_truncated(SilcHmac hmac, unsigned char *data,
SilcUInt32 truncated_len,
unsigned char *return_hash)
{
- unsigned char hvalue[20];
+ unsigned char hvalue[SILC_HASH_MAXLEN];
SILC_LOG_DEBUG(("Making HMAC for message"));
SilcUInt32 key_len)
{
SilcHash hash = hmac->hash;
-
- silc_hmac_init_internal(hmac, hmac->key, hmac->key_len);
-
- if (!hmac->hash_context)
- hmac->hash_context = silc_calloc(1, hash->hash->context_len());
-
- hash->hash->init(hmac->hash_context);
- hash->hash->update(hmac->hash_context, hmac->inner_pad,
- hash->hash->block_len);
+ silc_hmac_init_internal(hmac, (unsigned char *)key, key_len);
+ silc_hash_init(hash);
+ silc_hash_update(hash, hmac->inner_pad, silc_hash_block_len(hash));
}
/* Add data to be used in the MAC computation. */
SilcUInt32 data_len)
{
SilcHash hash = hmac->hash;
- hash->hash->update(hmac->hash_context, (unsigned char *)data, data_len);
+ silc_hash_update(hash, data, data_len);
}
/* Compute the final MAC. */
SilcUInt32 *return_len)
{
SilcHash hash = hmac->hash;
- unsigned char mac[20];
-
- hash->hash->final(hmac->hash_context, mac);
- hash->hash->init(hmac->hash_context);
- hash->hash->update(hmac->hash_context, hmac->outer_pad,
- hash->hash->block_len);
- hash->hash->update(hmac->hash_context, mac, hash->hash->hash_len);
- hash->hash->final(hmac->hash_context, mac);
+ unsigned char mac[SILC_HASH_MAXLEN];
+
+ silc_hash_final(hash, mac);
+ silc_hash_init(hash);
+ silc_hash_update(hash, hmac->outer_pad, silc_hash_block_len(hash));
+ silc_hash_update(hash, mac, silc_hash_len(hash));
+ silc_hash_final(hash, mac);
memcpy(return_hash, mac, hmac->hmac->len);
memset(mac, 0, sizeof(mac));
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