126 lines
3.8 KiB
C
126 lines
3.8 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2016 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "crypto.h"
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#include "misc.h"
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#include "tomcrypt.h"
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enum crypto_method_t g_cur_method = CRYPTO_NONE;
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uint8_t g_key[16];
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int cbc_mac2(
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const uint8_t *in_data, /* Input data */
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uint8_t *out_data, /* Output data (or NULL) */
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int nr_blocks, /* Number of blocks to encrypt/decrypt (one block=16 bytes) */
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uint8_t key[16], /* Key */
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uint8_t iv[16], /* Initialisation Vector */
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uint8_t (*out_cbc_mac)[16], /* CBC-MAC of the result (or NULL) */
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bool encrypt /* 1 to encrypt, 0 to decrypt */
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)
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{
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int cipher = register_cipher(&aes_desc);
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symmetric_CBC cbc;
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cbc_start(cipher, iv, key, 16, 0, &cbc);
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/* encrypt */
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if(encrypt)
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{
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uint8_t tmp[16];
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/* we need some output buffer, either a temporary one if we are CBC-MACing
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* only, or use output buffer if available */
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uint8_t *out_ptr = (out_data == NULL) ? tmp : out_data;
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while(nr_blocks-- > 0)
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{
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cbc_encrypt(in_data, out_ptr, 16, &cbc);
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/* if this is the last block, copy CBC-MAC */
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if(nr_blocks == 0 && out_cbc_mac)
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memcpy(out_cbc_mac, out_ptr, 16);
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/* if we are writing data to the output buffer, advance output pointer */
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if(out_data != NULL)
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out_ptr += 16;
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in_data += 16;
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}
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return CRYPTO_ERROR_SUCCESS;
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}
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/* decrypt */
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else
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{
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cbc_decrypt(in_data, out_data, nr_blocks * 16, &cbc);
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/* update keys if neeeded */
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/* we cannot produce a CBC-MAC in decrypt mode, output buffer exists */
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if(out_cbc_mac || out_data == NULL)
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return CRYPTO_ERROR_INVALID_OP;
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return CRYPTO_ERROR_SUCCESS;
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}
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}
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int crypto_setup(struct crypto_key_t *key)
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{
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g_cur_method = key->method;
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switch(g_cur_method)
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{
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case CRYPTO_KEY:
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memcpy(g_key, key->u.key, 16);
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return CRYPTO_ERROR_SUCCESS;
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default:
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return CRYPTO_ERROR_BADSETUP;
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}
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}
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int crypto_apply(
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uint8_t *in_data, /* Input data */
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uint8_t *out_data, /* Output data (or NULL) */
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int nr_blocks, /* Number of blocks (one block=16 bytes) */
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uint8_t iv[16], /* Key */
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uint8_t (*out_cbc_mac)[16], /* CBC-MAC of the result (or NULL) */
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bool encrypt)
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{
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if(g_cur_method == CRYPTO_KEY)
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return cbc_mac2(in_data, out_data, nr_blocks, g_key, iv, out_cbc_mac, encrypt);
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else
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return CRYPTO_ERROR_BADSETUP;
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}
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void sha_1_init(struct sha_1_params_t *params)
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{
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sha1_init(¶ms->state);
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}
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void sha_1_update(struct sha_1_params_t *params, uint8_t *buffer, int size)
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{
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sha1_process(¶ms->state, buffer, size);
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}
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void sha_1_finish(struct sha_1_params_t *params)
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{
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sha1_done(¶ms->state, params->hash);
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}
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void sha_1_output(struct sha_1_params_t *params, uint8_t *out)
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{
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memcpy(out, params->hash, 20);
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}
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