/* 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 #include #include #ifdef CONFIG_TZ_ROM #include "rom/compiler.h" #endif __xip_text int tc_ecb_mode_encrypt(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, const TCAesKeySched_t sched) { unsigned int n; /* 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; } for (n = 0; n < inlen; ++n) { if ((n % TC_AES_BLOCK_SIZE) == 0) { tc_aes_encrypt(out, in, sched); in += TC_AES_BLOCK_SIZE; out += TC_AES_BLOCK_SIZE; } } return TC_CRYPTO_SUCCESS; } __xip_text int tc_ecb_mode_decrypt(uint8_t *out, unsigned int outlen, const uint8_t *in, unsigned int inlen, const TCAesKeySched_t sched) { unsigned int n; /* 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) { return TC_CRYPTO_FAIL; } for (n = 0; n < inlen; ++n) { if ((n % TC_AES_BLOCK_SIZE) == 0) { tc_aes_decrypt(out, in, sched); in += TC_AES_BLOCK_SIZE; out += TC_AES_BLOCK_SIZE; } } return TC_CRYPTO_SUCCESS; }