3 This file is part of the AVR-Crypto-Lib.
4 Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include <avr/pgmspace.h>
24 #include "blockcipher_descriptor.h"
25 #include "keysize_descriptor.h"
27 uint8_t bcal_cipher_init(const bcdesc_t *cipher_descriptor,
28 const void *key, uint16_t keysize_b, bcgen_ctx_t *ctx)
30 if (!is_valid_keysize_P((PGM_VOID_P) pgm_read_word(&(cipher_descriptor->valid_keysize_desc)),
36 ctx->desc_ptr = (bcdesc_t*) cipher_descriptor;
37 ctx->keysize = keysize_b;
38 flags = pgm_read_byte(cipher_descriptor->flags);
40 (void_fpt) (pgm_read_word(&(cipher_descriptor->init.initvoid)));
41 if (init_fpt.initvoid == NULL) {
42 if (!(ctx->ctx = malloc((keysize_b + 7) / 8)))
44 memcpy(ctx->ctx, key, (keysize_b + 7) / 8);
47 if (!(ctx->ctx = malloc(pgm_read_word(&(cipher_descriptor->ctxsize_B)))))
49 if ((flags & BC_INIT_TYPE) == BC_INIT_TYPE_1) {
50 init_fpt.init1((void*) key, (ctx->ctx));
52 init_fpt.init2((void*) key, keysize_b, (ctx->ctx));
57 void bcal_cipher_free(bcgen_ctx_t *ctx)
62 free_fpt = (bc_free_fpt) (pgm_read_word(&(ctx->desc_ptr->free)));
68 void bcal_cipher_enc(void *block, const bcgen_ctx_t *ctx)
71 enc_fpt.encvoid = (void_fpt) pgm_read_word(&(ctx->desc_ptr->enc.encvoid));
72 if (!enc_fpt.encvoid) {
73 /* very bad error, no enciphering function specified */
76 enc_fpt.enc1(block, (ctx->ctx));
80 void bcal_cipher_dec(void *block, const bcgen_ctx_t *ctx)
83 dec_fpt.decvoid = (void_fpt) pgm_read_word(&(ctx->desc_ptr->dec.decvoid));
84 if (!dec_fpt.decvoid) {
85 /* very bad error, no deciphering function specified */
88 dec_fpt.dec1(block, (ctx->ctx));
91 uint16_t bcal_cipher_getBlocksize_b(const bcdesc_t *desc)
93 return pgm_read_word(&(desc->blocksize_b));
96 PGM_VOID_P bcal_cipher_getKeysizeDesc(const bcdesc_t *desc) {
97 return (PGM_VOID_P)pgm_read_word(&(desc->valid_keysize_desc));