ESP-IDF
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Outline
#include <tinycrypt/cbc_mode.h>
#include <tinycrypt/constants.h>
#include <tinycrypt/utils.h>
tc_cbc_mode_encrypt(uint8_t *, unsigned int, const uint8_t *, unsigned int, const uint8_t *, const TCAesKeySched_t)
tc_cbc_mode_decrypt(uint8_t *, unsigned int, const uint8_t *, unsigned int, const uint8_t *, const TCAesKeySched_t)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/bt/porting/ext/tinycrypt/src/cbc_mode.c
 
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/* cbc_mode.c - TinyCrypt implementation of CBC mode encryption & decryption */ /* * Copyright (C) 2017 by Intel Corporation, All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Intel Corporation nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. *//* ... */ #include <tinycrypt/cbc_mode.h> #include <tinycrypt/constants.h> #include <tinycrypt/utils.h> int tc_cbc_mode_encrypt(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, const uint8_t *iv, const TCAesKeySched_t sched) { uint8_t buffer[TC_AES_BLOCK_SIZE]; unsigned int n, m; /* input sanity check: */ if (out == (uint8_t *) 0 || in == (const uint8_t *) 0 || sched == (TCAesKeySched_t) 0 || inlen == 0 || outlen == 0 || (inlen % TC_AES_BLOCK_SIZE) != 0 || (outlen % TC_AES_BLOCK_SIZE) != 0 || outlen != inlen + TC_AES_BLOCK_SIZE) { return TC_CRYPTO_FAIL; }{...} /* copy iv to the buffer */ (void)_copy(buffer, TC_AES_BLOCK_SIZE, iv, TC_AES_BLOCK_SIZE); /* copy iv to the output buffer */ (void)_copy(out, TC_AES_BLOCK_SIZE, iv, TC_AES_BLOCK_SIZE); out += TC_AES_BLOCK_SIZE; for (n = m = 0; n < inlen; ++n) { buffer[m++] ^= *in++; if (m == TC_AES_BLOCK_SIZE) { (void)tc_aes_encrypt(buffer, buffer, sched); (void)_copy(out, TC_AES_BLOCK_SIZE, buffer, TC_AES_BLOCK_SIZE); out += TC_AES_BLOCK_SIZE; m = 0; }{...} }{...} return TC_CRYPTO_SUCCESS; }{ ... } int tc_cbc_mode_decrypt(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, const uint8_t *iv, const TCAesKeySched_t sched) { uint8_t buffer[TC_AES_BLOCK_SIZE]; const uint8_t *p; unsigned int n, m; /* sanity check the inputs */ if (out == (uint8_t *) 0 || in == (const uint8_t *) 0 || sched == (TCAesKeySched_t) 0 || inlen == 0 || outlen == 0 || (inlen % TC_AES_BLOCK_SIZE) != 0 || (outlen % TC_AES_BLOCK_SIZE) != 0 || outlen != inlen - TC_AES_BLOCK_SIZE) { return TC_CRYPTO_FAIL; }{...} /* * Note that in == iv + ciphertext, i.e. the iv and the ciphertext are * contiguous. This allows for a very efficient decryption algorithm * that would not otherwise be possible. *//* ... */ p = iv; for (n = m = 0; n < inlen; ++n) { if ((n % TC_AES_BLOCK_SIZE) == 0) { (void)tc_aes_decrypt(buffer, in, sched); in += TC_AES_BLOCK_SIZE; m = 0; }{...} *out++ = buffer[m++] ^ *p++; }{...} return TC_CRYPTO_SUCCESS; }{ ... }
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