102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/* bcal-basic.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <avr/pgmspace.h>
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#include "blockcipher_descriptor.h"
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#include "keysize_descriptor.h"
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uint8_t bcal_cipher_init(const bcdesc_t *cipher_descriptor,
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const void *key, uint16_t keysize_b, bcgen_ctx_t *ctx)
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{
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if (!is_valid_keysize_P((PGM_VOID_P) pgm_read_word(&(cipher_descriptor->valid_keysize_desc)),
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keysize_b)) {
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return 1;
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}
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uint8_t flags;
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bc_init_fpt init_fpt;
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ctx->desc_ptr = (bcdesc_t*) cipher_descriptor;
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ctx->keysize = keysize_b;
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flags = pgm_read_byte(cipher_descriptor->flags);
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init_fpt.initvoid =
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(void_fpt) (pgm_read_word(&(cipher_descriptor->init.initvoid)));
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if (init_fpt.initvoid == NULL) {
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if (!(ctx->ctx = malloc((keysize_b + 7) / 8))) {
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return 2;
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}
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memcpy(ctx->ctx, key, (keysize_b + 7) / 8);
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return 0;
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}
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if (!(ctx->ctx = malloc(pgm_read_word(&(cipher_descriptor->ctxsize_B))))) {
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return 3;
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}
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if ((flags & BC_INIT_TYPE) == BC_INIT_TYPE_1) {
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init_fpt.init1((void*) key, (ctx->ctx));
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} else {
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init_fpt.init2((void*) key, keysize_b, (ctx->ctx));
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}
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return 0;
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}
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void bcal_cipher_free(bcgen_ctx_t *ctx)
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{
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if (!ctx)
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return;
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bc_free_fpt free_fpt;
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free_fpt = (bc_free_fpt) (pgm_read_word(&(ctx->desc_ptr->free)));
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if (free_fpt)
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free_fpt((ctx->ctx));
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free(ctx->ctx);
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}
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void bcal_cipher_enc(void *block, const bcgen_ctx_t *ctx)
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{
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bc_enc_fpt enc_fpt;
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enc_fpt.encvoid = (void_fpt) pgm_read_word(&(ctx->desc_ptr->enc.encvoid));
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if (!enc_fpt.encvoid) {
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/* very bad error, no enciphering function specified */
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return;
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}
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enc_fpt.enc1(block, (ctx->ctx));
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}
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void bcal_cipher_dec(void *block, const bcgen_ctx_t *ctx)
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{
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bc_dec_fpt dec_fpt;
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dec_fpt.decvoid = (void_fpt) pgm_read_word(&(ctx->desc_ptr->dec.decvoid));
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if (!dec_fpt.decvoid) {
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/* very bad error, no deciphering function specified */
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return;
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}
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dec_fpt.dec1(block, (ctx->ctx));
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}
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uint16_t bcal_cipher_getBlocksize_b(const bcdesc_t *desc)
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{
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return pgm_read_word(&(desc->blocksize_b));
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}
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PGM_VOID_P bcal_cipher_getKeysizeDesc(const bcdesc_t *desc) {
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return (PGM_VOID_P)pgm_read_word(&(desc->valid_keysize_desc));
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}
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