+++ /dev/null
-/*
-
- silchash.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 1997 - 2007 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; 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.
-
-*/
-/* $Id$ */
-
-#include "silc.h"
-
-#include "md5.h"
-#include "sha1.h"
-#include "sha256.h"
-#include "sha512.h"
-
-/* The main SILC hash structure. */
-struct SilcHashStruct {
- SilcHashObject *hash;
- void *context;
-};
-
-#ifndef SILC_SYMBIAN
-/* List of dynamically registered hash functions. */
-SilcDList silc_hash_list = NULL;
-#endif /* SILC_SYMBIAN */
-
-/* Default hash functions for silc_hash_register_default(). */
-const SilcHashObject silc_default_hash[] =
-{
- { "sha256", "2.16.840.1.101.3.4.2.1",
- 32, 64, silc_sha256_init, silc_sha256_update, silc_sha256_final,
- silc_sha256_transform, silc_sha256_context_len },
- { "sha512", "2.16.840.1.101.3.4.2.3",
- 32, 64, silc_sha512_init, silc_sha512_update, silc_sha512_final,
- silc_sha512_transform, silc_sha512_context_len },
- { "sha1", "1.3.14.3.2.26",
- 20, 64, silc_sha1_init, silc_sha1_update, silc_sha1_final,
- silc_sha1_transform, silc_sha1_context_len },
- { "md5", "1.2.840.113549.2.5",
- 16, 64, silc_md5_init, silc_md5_update, silc_md5_final,
- silc_md5_transform, silc_md5_context_len },
-
- { NULL, NULL, 0, 0, NULL, NULL, NULL, NULL, NULL }
-};
-
-/* Registers a new hash function */
-
-SilcBool silc_hash_register(const SilcHashObject *hash)
-{
-#ifndef SILC_SYMBIAN
- SilcHashObject *new;
-
- SILC_LOG_DEBUG(("Registering new hash function `%s'", hash->name));
-
- /* 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;
- }
- }
-
- new = silc_calloc(1, sizeof(*new));
- if (!new)
- return FALSE;
- new->name = strdup(hash->name);
- if (!new->name) {
- silc_free(new);
- return FALSE;
- }
- new->oid = strdup(hash->oid);
- if (!new->oid) {
- silc_free(new);
- return FALSE;
- }
- 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_SYMBIAN */
- return TRUE;
-}
-
-/* Unregister a hash function */
-
-SilcBool silc_hash_unregister(SilcHashObject *hash)
-{
-#ifndef SILC_SYMBIAN
- SilcHashObject *entry;
-
- SILC_LOG_DEBUG(("Unregistering hash function"));
-
- if (!silc_hash_list)
- return FALSE;
-
- 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->oid);
- silc_free(entry);
-
- if (silc_dlist_count(silc_hash_list) == 0) {
- silc_dlist_uninit(silc_hash_list);
- silc_hash_list = NULL;
- }
-
- return TRUE;
- }
- }
-
-#endif /* SILC_SYMBIAN */
- return FALSE;
-}
-
-/* Register default hash functions */
-
-SilcBool silc_hash_register_default(void)
-{
- /* We use builtin hash functions */
- return TRUE;
-}
-
-/* Unregister all hash functions */
-
-SilcBool silc_hash_unregister_all(void)
-{
-#ifndef SILC_SYMBIAN
- 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_SYMBIAN */
- return TRUE;
-}
-
-/* Allocates a new SilcHash object. New object is returned into new_hash
- argument. */
-
-SilcBool silc_hash_alloc(const char *name, SilcHash *new_hash)
-{
- SilcHashObject *entry = NULL;
- int i;
-
- SILC_LOG_DEBUG(("Allocating new hash %s", name));
-
-#ifndef SILC_SYMBIAN
- /* Check list of registered hash functions */
- 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))
- break;
- }
- }
-#endif /* SILC_SYMBIAN */
-
- if (!entry) {
- /* Check builtin hash function list */
- for (i = 0; silc_default_hash[i].name; i++) {
- if (!strcmp(silc_default_hash[i].name, name)) {
- entry = (SilcHashObject *)&(silc_default_hash[i]);
- break;
- }
- }
- }
-
- if (entry) {
- *new_hash = silc_calloc(1, sizeof(**new_hash));
- if (!(*new_hash))
- return FALSE;
- (*new_hash)->hash = entry;
- (*new_hash)->context = silc_calloc(1, entry->context_len());
- if (!(*new_hash)->context) {
- silc_free(*new_hash);
- return FALSE;
- }
- return TRUE;
- }
-
- return FALSE;
-}
-
-/* Allocate hash by OID string */
-
-SilcBool silc_hash_alloc_by_oid(const char *oid, SilcHash *new_hash)
-{
- SilcHashObject *entry = NULL;
- int i;
-
- SILC_LOG_DEBUG(("Allocating new hash %s", oid));
-
-#ifndef SILC_SYMBIAN
- /* Check list of registered hash functions */
- if (silc_hash_list) {
- silc_dlist_start(silc_hash_list);
- while ((entry = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
- if (!strcmp(entry->oid, oid))
- break;
- }
- }
-#endif /* SILC_SYMBIAN */
-
- if (!entry) {
- /* Check builtin hash function list */
- for (i = 0; silc_default_hash[i].oid; i++) {
- if (!strcmp(silc_default_hash[i].oid, oid)) {
- entry = (SilcHashObject *)&(silc_default_hash[i]);
- break;
- }
- }
- }
-
- if (entry) {
- *new_hash = silc_calloc(1, sizeof(**new_hash));
- if (!(*new_hash))
- return FALSE;
- (*new_hash)->hash = entry;
- (*new_hash)->context = silc_calloc(1, entry->context_len());
- if (!(*new_hash)->context) {
- silc_free(*new_hash);
- return FALSE;
- }
- return TRUE;
- }
-
- return FALSE;
-}
-
-/* Free's the SilcHash object */
-
-void silc_hash_free(SilcHash hash)
-{
- if (hash) {
- silc_free(hash->context);
- silc_free(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 hash OID string */
-
-const char *silc_hash_get_oid(SilcHash hash)
-{
- return hash->hash->oid;
-}
-
-/* Returns TRUE if hash algorithm `name' is supported. */
-
-SilcBool silc_hash_is_supported(const char *name)
-{
- SilcHashObject *entry;
- int i;
-
-#ifndef SILC_SYMBIAN
- 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;
- }
- }
-#endif /* SILC_SYMBIAN */
-
- for (i = 0; silc_default_hash[i].name; i++)
- if (!strcmp(silc_default_hash[i].name, name))
- return TRUE;
-
- return FALSE;
-}
-
-/* Returns comma separated list of supported hash functions. */
-
-char *silc_hash_get_supported(void)
-{
- SilcHashObject *entry, *entry2;
- char *list = NULL;
- int i, len = 0;
-
-#ifndef SILC_SYMBIAN
- if (silc_hash_list) {
- 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(entry->name)),
- entry->name, strlen(entry->name));
- memcpy(list + len, ",", 1);
- len++;
- }
- }
-#endif /* SILC_SYMBIAN */
-
- for (i = 0; silc_default_hash[i].name; i++) {
- entry = (SilcHashObject *)&(silc_default_hash[i]);
-
- if (silc_hash_list) {
- silc_dlist_start(silc_hash_list);
- while ((entry2 = silc_dlist_get(silc_hash_list)) != SILC_LIST_END) {
- if (!strcmp(entry2->name, entry->name))
- break;
- }
- if (entry2)
- continue;
- }
-
- len += strlen(entry->name);
- list = silc_realloc(list, len + 1);
-
- memcpy(list + (len - strlen(entry->name)),
- entry->name, strlen(entry->name));
- memcpy(list + len, ",", 1);
- len++;
- }
-
- list[len - 1] = 0;
-
- return list;
-}
-
-/* Creates the hash value and returns it to the return_hash argument. */
-
-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);
-}
-
-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, void *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 freed by the
- caller. */
-
-char *silc_hash_fingerprint(SilcHash hash, const unsigned char *data,
- SilcUInt32 data_len)
-{
- SilcHash new_hash = NULL;
- unsigned char h[32];
- char *ret;
-
- if (!hash) {
- if (!silc_hash_alloc("sha1", &new_hash))
- return NULL;
- hash = new_hash;
- }
-
- silc_hash_make(hash, data, data_len, h);
- 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) {
- if (!silc_hash_alloc("sha1", &new_hash))
- return NULL;
- 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));
- if (!babbleprint) {
- silc_hash_free(new_hash);
- return NULL;
- }
- 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];
- }
-
- 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;
-}
projects / silc.git / blobdiff