X-Git-Url: http://git.silcnet.org/gitweb/?a=blobdiff_plain;f=lib%2Fsilccrypt%2Fsilccipher.c;h=f7f64600b34633fc788f756d59dfffab5061f143;hb=52e57c880aba9c5e89f59d962eb9af75670b76e0;hp=c321f6f9ea3258d76bb75ed499de3280d1387917;hpb=72cfa31520ebc0058763a30e21c13f6e9a964aa0;p=silc.git diff --git a/lib/silccrypt/silccipher.c b/lib/silccrypt/silccipher.c index c321f6f9..f7f64600 100644 --- a/lib/silccrypt/silccipher.c +++ b/lib/silccrypt/silccipher.c @@ -2,15 +2,14 @@ silccipher.c - Author: Pekka Riikonen + Author: Pekka Riikonen - Copyright (C) 1997 - 2001 Pekka Riikonen + 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; 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 @@ -19,69 +18,52 @@ */ /* $Id$ */ -#include "silcincludes.h" - +#include "silc.h" #include "ciphers.h" /* Includes cipher definitions */ -/* List of all ciphers in SILC. You can dynamically add new ciphers - into the list. At the initialization of SILC this list is filled with - the configured ciphers. */ -struct SilcCipherListStruct { +/* The SilcCipher context */ +struct SilcCipherStruct { SilcCipherObject *cipher; - struct SilcCipherListStruct *next; + void *context; + unsigned char iv[SILC_CIPHER_MAX_IV_SIZE]; }; +#ifndef SILC_SYMBIAN /* Dynamically registered list of ciphers. */ -struct SilcCipherListStruct *silc_cipher_list = NULL; +SilcDList silc_cipher_list = NULL; +#endif /* SILC_SYMBIAN */ + +/* Macro to define cipher to cipher list */ +#define SILC_CIPHER_API_DEF(name, cipher, keylen, blocklen, ivlen, mode) \ +{ name, silc_##cipher##_set_key, silc_##cipher##_set_iv, \ + silc_##cipher##_encrypt, silc_##cipher##_decrypt, \ + silc_##cipher##_context_len, keylen, blocklen, ivlen, mode } -/* Staticly declared list of ciphers. This is used if system doesn't - support SIM's. */ -SilcCipherObject silc_cipher_builtin_list[] = +/* Static list of ciphers for silc_cipher_register_default(). */ +const SilcCipherObject silc_default_ciphers[] = { - { "aes-256-cbc", 16, 256, silc_aes_set_key, - silc_aes_set_key_with_string, silc_aes_encrypt_cbc, - silc_aes_decrypt_cbc, silc_aes_context_len }, - { "aes-192-cbc", 16, 192, silc_aes_set_key, - silc_aes_set_key_with_string, silc_aes_encrypt_cbc, - silc_aes_decrypt_cbc, silc_aes_context_len }, - { "aes-128-cbc", 16, 128, silc_aes_set_key, - silc_aes_set_key_with_string, silc_aes_encrypt_cbc, - silc_aes_decrypt_cbc, silc_aes_context_len }, - { "twofish-256-cbc", 16, 256, silc_twofish_set_key, - silc_twofish_set_key_with_string, - silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc, - silc_twofish_context_len }, - { "twofish-192-cbc", 16, 192, silc_twofish_set_key, - silc_twofish_set_key_with_string, - silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc, - silc_twofish_context_len }, - { "twofish-128-cbc", 16, 128, silc_twofish_set_key, - silc_twofish_set_key_with_string, - silc_twofish_encrypt_cbc, silc_twofish_decrypt_cbc, - silc_twofish_context_len }, - { "rc6-256-cbc", 16, 256, silc_rc6_set_key, silc_rc6_set_key_with_string, - silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc, - silc_rc6_context_len }, - { "rc6-192-cbc", 16, 192, silc_rc6_set_key, silc_rc6_set_key_with_string, - silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc, - silc_rc6_context_len }, - { "rc6-128-cbc", 16, 128, silc_rc6_set_key, silc_rc6_set_key_with_string, - silc_rc6_encrypt_cbc, silc_rc6_decrypt_cbc, - silc_rc6_context_len }, - { "mars-256-cbc", 16, 256, silc_mars_set_key, silc_mars_set_key_with_string, - silc_mars_encrypt_cbc, silc_mars_decrypt_cbc, - silc_mars_context_len }, - { "mars-192-cbc", 16, 192, silc_mars_set_key, silc_mars_set_key_with_string, - silc_mars_encrypt_cbc, silc_mars_decrypt_cbc, - silc_mars_context_len }, - { "mars-128-cbc", 16, 128, silc_mars_set_key, silc_mars_set_key_with_string, - silc_mars_encrypt_cbc, silc_mars_decrypt_cbc, - silc_mars_context_len }, - { "none", 0, 0, silc_none_set_key, silc_none_set_key_with_string, - silc_none_encrypt_cbc, silc_none_decrypt_cbc, - silc_none_context_len }, - - { NULL, 0, 0, NULL, NULL, NULL, NULL, NULL } + SILC_CIPHER_API_DEF("aes-256-ctr", aes_ctr, 256, 16, 16, + SILC_CIPHER_MODE_CTR), + SILC_CIPHER_API_DEF("aes-192-ctr", aes_ctr, 192, 16, 16, + SILC_CIPHER_MODE_CTR), + SILC_CIPHER_API_DEF("aes-128-ctr", aes_ctr, 128, 16, 16, + SILC_CIPHER_MODE_CTR), + SILC_CIPHER_API_DEF("aes-256-cbc", aes_cbc, 256, 16, 16, + SILC_CIPHER_MODE_CBC), + SILC_CIPHER_API_DEF("aes-192-cbc", aes_cbc, 192, 16, 16, + SILC_CIPHER_MODE_CBC), + SILC_CIPHER_API_DEF("aes-128-cbc", aes_cbc, 128, 16, 16, + SILC_CIPHER_MODE_CBC), + SILC_CIPHER_API_DEF("twofish-256-cbc", twofish_cbc, 256, 16, 16, + SILC_CIPHER_MODE_CBC), + SILC_CIPHER_API_DEF("twofish-192-cbc", twofish_cbc, 192, 16, 16, + SILC_CIPHER_MODE_CBC), + SILC_CIPHER_API_DEF("twofish-128-cbc", twofish_cbc, 128, 16, 16, + SILC_CIPHER_MODE_CBC), +#ifdef SILC_DEBUG + SILC_CIPHER_API_DEF("none", none, 0, 0, 0, 0), +#endif /* SILC_DEBUG */ + { NULL, NULL, 0, 0, 0, 0 } }; /* Register a new cipher into SILC. This is used at the initialization of @@ -89,154 +71,162 @@ SilcCipherObject silc_cipher_builtin_list[] = registered. Therefore, if memory has been allocated for the object sent as argument it has to be free'd after this function returns succesfully. */ -int silc_cipher_register(SilcCipherObject *cipher) +SilcBool silc_cipher_register(const SilcCipherObject *cipher) { - struct SilcCipherListStruct *new, *c; +#ifndef SILC_SYMBIAN + SilcCipherObject *new; SILC_LOG_DEBUG(("Registering new cipher `%s'", cipher->name)); - new = silc_calloc(1, sizeof(*new)); - new->cipher = silc_calloc(1, sizeof(*new->cipher)); - - /* Set the pointers */ - new->cipher->name = strdup(cipher->name); - new->cipher->block_len = cipher->block_len; - new->cipher->key_len = cipher->key_len; - new->cipher->set_key = cipher->set_key; - new->cipher->set_key_with_string = cipher->set_key_with_string; - new->cipher->encrypt = cipher->encrypt; - new->cipher->decrypt = cipher->decrypt; - new->cipher->context_len = cipher->context_len; - new->next = NULL; - - /* Add the new cipher to the list */ - if (!silc_cipher_list) { - silc_cipher_list = new; - return TRUE; - } - - c = silc_cipher_list; - while (c) { - if (!c->next) { - c->next = new; - break; + /* Check if exists already */ + if (silc_cipher_list) { + SilcCipherObject *entry; + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + if (!strcmp(entry->name, cipher->name)) + return FALSE; } - c = c->next; } + new = silc_calloc(1, sizeof(*new)); + if (!new) + return FALSE; + new->name = strdup(cipher->name); + if (!new->name) { + silc_free(new); + return FALSE; + } + new->key_len = cipher->key_len; + new->block_len = cipher->block_len; + new->iv_len = cipher->iv_len; + new->set_key = cipher->set_key; + new->set_iv = cipher->set_iv; + new->encrypt = cipher->encrypt; + new->decrypt = cipher->decrypt; + new->context_len = cipher->context_len; + new->mode = cipher->mode; + + /* Add to list */ + if (silc_cipher_list == NULL) + silc_cipher_list = silc_dlist_init(); + silc_dlist_add(silc_cipher_list, new); + +#endif /* SILC_SYMBIAN */ return TRUE; } /* Unregister a cipher from the SILC. */ -int silc_cipher_unregister(SilcCipherObject *cipher) +SilcBool silc_cipher_unregister(SilcCipherObject *cipher) { - struct SilcCipherListStruct *c, *tmp; +#ifndef SILC_SYMBIAN + SilcCipherObject *entry; SILC_LOG_DEBUG(("Unregistering cipher")); - c = silc_cipher_list; - - if (cipher == SILC_ALL_CIPHERS) { - /* Unregister all ciphers */ - while (c) { - tmp = c->next; - silc_free(c->cipher->name); - silc_free(c); - c = tmp; - } - - return TRUE; - } - - /* Unregister the cipher */ - if (c->cipher == cipher) { - tmp = c->next; - silc_free(c->cipher->name); - silc_free(c); - silc_cipher_list = tmp; - - return TRUE; - } + if (!silc_cipher_list) + return FALSE; - while (c) { - if (c->next->cipher == cipher) { + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + if (cipher == SILC_ALL_CIPHERS || entry == cipher) { + silc_dlist_del(silc_cipher_list, entry); + silc_free(entry->name); + silc_free(entry); - tmp = c->next->next; - silc_free(c->cipher->name); - silc_free(c); - c->next = tmp; + if (silc_dlist_count(silc_cipher_list) == 0) { + silc_dlist_uninit(silc_cipher_list); + silc_cipher_list = NULL; + } return TRUE; } - - c = c->next; } +#endif /* SILC_SYMBIAN */ return FALSE; } -/* Allocates a new SILC cipher object. Function returns 1 on succes and 0 +/* Function that registers all the default ciphers (all builtin ciphers). + The application may use this to register the default ciphers if specific + ciphers in any specific order is not wanted. */ + +SilcBool silc_cipher_register_default(void) +{ +#ifndef SILC_SYMBIAN + int i; + + for (i = 0; silc_default_ciphers[i].name; i++) + silc_cipher_register(&(silc_default_ciphers[i])); + +#endif /* SILC_SYMBIAN */ + return TRUE; +} + +SilcBool silc_cipher_unregister_all(void) +{ +#ifndef SILC_SYMBIAN + SilcCipherObject *entry; + + if (!silc_cipher_list) + return FALSE; + + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + silc_cipher_unregister(entry); + if (!silc_cipher_list) + break; + } +#endif /* SILC_SYMBIAN */ + return TRUE; +} + +/* Allocates a new SILC cipher object. Function returns 1 on succes and 0 on error. The allocated cipher is returned in new_cipher argument. The caller must set the key to the cipher after this function has returned by calling the ciphers set_key function. */ -int silc_cipher_alloc(const unsigned char *name, SilcCipher *new_cipher) +SilcBool silc_cipher_alloc(const unsigned char *name, SilcCipher *new_cipher) { - struct SilcCipherListStruct *c; - int i; + SilcCipherObject *entry = NULL; SILC_LOG_DEBUG(("Allocating new cipher object")); - /* Allocate the new object */ - *new_cipher = silc_calloc(1, sizeof(**new_cipher)); - +#ifndef SILC_SYMBIAN if (silc_cipher_list) { - - c = silc_cipher_list; - while (c) { - if (!strcmp(c->cipher->name, name)) + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + if (!strcmp(entry->name, name)) break; - c = c->next; } - - if (!c || !c->cipher->context_len) - goto check_builtin; - - /* Set the pointers */ - (*new_cipher)->cipher = c->cipher; - (*new_cipher)->context = silc_calloc(1, c->cipher->context_len()); - (*new_cipher)->set_iv = silc_cipher_set_iv; - (*new_cipher)->get_iv = silc_cipher_get_iv; - (*new_cipher)->get_key_len = silc_cipher_get_key_len; - (*new_cipher)->get_block_len = silc_cipher_get_block_len; - - return TRUE; } - - check_builtin: - - for (i = 0; silc_cipher_builtin_list[i].name; i++) - if (!strcmp(silc_cipher_builtin_list[i].name, name)) - break; - - if (silc_cipher_builtin_list[i].name == NULL) { - silc_free(*new_cipher); - *new_cipher = NULL; - return FALSE; +#else + { + /* On EPOC which don't have globals we check our constant cipher list. */ + int i; + for (i = 0; silc_default_ciphers[i].name; i++) { + if (!strcmp(silc_default_ciphers[i].name, name)) { + entry = (SilcCipherObject *)&(silc_default_ciphers[i]); + break; + } + } + } +#endif /* SILC_SYMBIAN */ + + if (entry) { + *new_cipher = silc_calloc(1, sizeof(**new_cipher)); + if (!(*new_cipher)) + return FALSE; + (*new_cipher)->cipher = entry; + (*new_cipher)->context = silc_calloc(1, entry->context_len()); + if (!(*new_cipher)->context) { + silc_free(*new_cipher); + return FALSE; + } + return TRUE; } - /* Set the pointers */ - (*new_cipher)->cipher = &silc_cipher_builtin_list[i]; - (*new_cipher)->context = - silc_calloc(1, (*new_cipher)->cipher->context_len()); - (*new_cipher)->set_iv = silc_cipher_set_iv; - (*new_cipher)->get_iv = silc_cipher_get_iv; - (*new_cipher)->get_key_len = silc_cipher_get_key_len; - (*new_cipher)->get_block_len = silc_cipher_get_block_len; - memset(&(*new_cipher)->iv, 0, sizeof((*new_cipher)->iv)); - - return TRUE; + return FALSE; } /* Free's the given cipher. */ @@ -251,63 +241,65 @@ void silc_cipher_free(SilcCipher cipher) /* Returns TRUE if cipher `name' is supported. */ -int silc_cipher_is_supported(const unsigned char *name) +SilcBool silc_cipher_is_supported(const unsigned char *name) { - struct SilcCipherListStruct *c; - int i; +#ifndef SILC_SYMBIAN + SilcCipherObject *entry; if (silc_cipher_list) { - c = silc_cipher_list; - - while (c) { - if (!strcmp(c->cipher->name, name)) + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + if (!strcmp(entry->name, name)) return TRUE; - c = c->next; } } - - for (i = 0; silc_cipher_builtin_list[i].name; i++) - if (!strcmp(silc_cipher_builtin_list[i].name, name)) - return TRUE; - +#else + { + int i; + for (i = 0; silc_default_ciphers[i].name; i++) + if (!strcmp(silc_default_ciphers[i].name, name)) + return TRUE; + } +#endif /* SILC_SYMBIAN */ return FALSE; } /* Returns comma separated list of supported ciphers. */ -char *silc_cipher_get_supported() +char *silc_cipher_get_supported(void) { + SilcCipherObject *entry; char *list = NULL; - int i, len; - struct SilcCipherListStruct *c; + int len = 0; - len = 0; +#ifndef SILC_SYMBIAN if (silc_cipher_list) { - c = silc_cipher_list; - - while (c) { - len += strlen(c->cipher->name); + silc_dlist_start(silc_cipher_list); + while ((entry = silc_dlist_get(silc_cipher_list)) != SILC_LIST_END) { + len += strlen(entry->name); list = silc_realloc(list, len + 1); - - memcpy(list + (len - strlen(c->cipher->name)), - c->cipher->name, strlen(c->cipher->name)); + + memcpy(list + (len - strlen(entry->name)), + entry->name, strlen(entry->name)); memcpy(list + len, ",", 1); len++; - - c = c->next; } } +#else + { + int i; + for (i = 0; silc_default_ciphers[i].name; i++) { + entry = (SilcCipherObject *)&(silc_default_ciphers[i]); + len += strlen(entry->name); + list = silc_realloc(list, len + 1); - for (i = 0; silc_cipher_builtin_list[i].name; i++) { - len += strlen(silc_cipher_builtin_list[i].name); - list = silc_realloc(list, len + 1); - - memcpy(list + (len - strlen(silc_cipher_builtin_list[i].name)), - silc_cipher_builtin_list[i].name, - strlen(silc_cipher_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_SYMBIAN */ list[len - 1] = 0; @@ -316,56 +308,79 @@ char *silc_cipher_get_supported() /* Encrypts */ -int silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src, - unsigned char *dst, uint32 len, - unsigned char *iv) +SilcBool silc_cipher_encrypt(SilcCipher cipher, const unsigned char *src, + unsigned char *dst, SilcUInt32 len, + unsigned char *iv) { - return cipher->cipher->encrypt(cipher->context, src, dst, len, iv); + return cipher->cipher->encrypt(cipher->context, src, dst, len, + iv ? iv : cipher->iv); } /* Decrypts */ -int silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src, - unsigned char *dst, uint32 len, - unsigned char *iv) +SilcBool silc_cipher_decrypt(SilcCipher cipher, const unsigned char *src, + unsigned char *dst, SilcUInt32 len, + unsigned char *iv) { - return cipher->cipher->decrypt(cipher->context, src, dst, len, iv); + return cipher->cipher->decrypt(cipher->context, src, dst, len, + iv ? iv : cipher->iv); } /* Sets the key for the cipher */ -int silc_cipher_set_key(SilcCipher cipher, const unsigned char *key, - uint32 keylen) +SilcBool silc_cipher_set_key(SilcCipher cipher, const unsigned char *key, + SilcUInt32 keylen, SilcBool encryption) { - return cipher->cipher->set_key(cipher->context, key, keylen); + return cipher->cipher->set_key(cipher->context, key, keylen, encryption); } /* Sets the IV (initial vector) for the cipher. */ void silc_cipher_set_iv(SilcCipher cipher, const unsigned char *iv) { - memset(&cipher->iv, 0, sizeof(cipher->iv)); - memcpy(&cipher->iv, iv, cipher->cipher->block_len); + if (iv) + memmove(&cipher->iv, iv, cipher->cipher->iv_len); + cipher->cipher->set_iv(cipher->context, iv); } -/* Returns the IV (initial vector) of the cipher. The IV is returned - to 'iv' argument. */ +/* Returns the IV (initial vector) of the cipher. */ -void silc_cipher_get_iv(SilcCipher cipher, unsigned char *iv) +unsigned char *silc_cipher_get_iv(SilcCipher cipher) { - memcpy(iv, &cipher->iv, cipher->cipher->block_len); + return cipher->iv; } /* Returns the key length of the cipher. */ -uint32 silc_cipher_get_key_len(SilcCipher cipher) +SilcUInt32 silc_cipher_get_key_len(SilcCipher cipher) { return cipher->cipher->key_len; } /* Returns the block size of the cipher. */ -uint32 silc_cipher_get_block_len(SilcCipher cipher) +SilcUInt32 silc_cipher_get_block_len(SilcCipher cipher) { return cipher->cipher->block_len; } + +/* Returns the IV length of the cipher. */ + +SilcUInt32 silc_cipher_get_iv_len(SilcCipher cipher) +{ + return cipher->cipher->iv_len; +} + +/* Returns the name of the cipher */ + +const char *silc_cipher_get_name(SilcCipher cipher) +{ + return (const char *)cipher->cipher->name; +} + +/* Returns cipher mode */ + +SilcCipherMode silc_cipher_get_mode(SilcCipher cipher) +{ + return cipher->cipher->mode; +}