// SPDX-License-Identifier: BSD-2-Clause
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/*
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* Copyright (c) 2014, STMicroelectronics International N.V.
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* All rights reserved.
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*/
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#include "aes_taf.h"
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#include "aes_impl.h"
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/* Encryption/decryption key */
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const unsigned char key[KEYLENGTH(AES_256)] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f
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};
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/* Encryption/decryption buffer */
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unsigned long rk[RKLENGTH(AES_256)];
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TEE_Result ta_entry_aes256ecb_encrypt(uint32_t param_types, TEE_Param params[4])
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{
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size_t n_input_blocks = 0;
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size_t i = 0;
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/*
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* It is expected that memRef[0] is input buffer and memRef[1] is
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* output buffer.
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*/
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if (param_types !=
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TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INPUT,
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TEE_PARAM_TYPE_MEMREF_OUTPUT, TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE)) {
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return TEE_ERROR_BAD_PARAMETERS;
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}
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/* Check that input buffer is whole mult. of block size, in bits */
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if ((params[0].memref.size << 8) % AES_BLOCK_SIZE != 0)
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return TEE_ERROR_BAD_PARAMETERS;
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/* Check that output buffer is whole mult. of block size, in bits */
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if ((params[1].memref.size << 8) % AES_BLOCK_SIZE != 0)
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return TEE_ERROR_BAD_PARAMETERS;
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/* Set up for encryption */
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(void)rijndaelSetupEncrypt(rk, key, AES_256);
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n_input_blocks = params[0].memref.size / (AES_BLOCK_SIZE / 8);
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for (i = 0; i < n_input_blocks; i++) {
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const unsigned char *ciphertext = params[0].memref.buffer;
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unsigned char *plaintext = params[1].memref.buffer;
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rijndaelEncrypt(rk, NROUNDS(AES_256),
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&ciphertext[i * (AES_BLOCK_SIZE / 8)],
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&plaintext[i * (AES_BLOCK_SIZE / 8)]);
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}
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return TEE_SUCCESS;
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}
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TEE_Result ta_entry_aes256ecb_decrypt(uint32_t param_types, TEE_Param params[4])
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{
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size_t n_input_blocks = 0;
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size_t i = 0;
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/*
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* It is expected that memRef[0] is input buffer and memRef[1] is
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* output buffer.
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*/
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if (param_types !=
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TEE_PARAM_TYPES(TEE_PARAM_TYPE_MEMREF_INPUT,
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TEE_PARAM_TYPE_MEMREF_OUTPUT, TEE_PARAM_TYPE_NONE,
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TEE_PARAM_TYPE_NONE)) {
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return TEE_ERROR_BAD_PARAMETERS;
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}
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/* Check that input buffer is whole mult. of block size, in bits */
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if ((params[0].memref.size << 8) % AES_BLOCK_SIZE != 0)
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return TEE_ERROR_BAD_PARAMETERS;
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/* Check that output buffer is whole mult. of block size, in bits */
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if ((params[1].memref.size << 8) % AES_BLOCK_SIZE != 0)
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return TEE_ERROR_BAD_PARAMETERS;
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/* Set up for decryption */
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(void)rijndaelSetupDecrypt(rk, key, AES_256);
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n_input_blocks = params[0].memref.size / (AES_BLOCK_SIZE / 8);
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for (i = 0; i < n_input_blocks; i++) {
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const unsigned char *ciphertext = params[0].memref.buffer;
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unsigned char *plaintext = params[1].memref.buffer;
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rijndaelDecrypt(rk, NROUNDS(AES_256),
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&ciphertext[i * (AES_BLOCK_SIZE / 8)],
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&plaintext[i * (AES_BLOCK_SIZE / 8)]);
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}
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return TEE_SUCCESS;
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}
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