1 /*
2 * Copyright (c) 2020 - 2024 Renesas Electronics Corporation and/or its affiliates
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 //////////////////////////////////////////////////////////////////////
8 // <SC32#4 AES-256 Decryption CBC Mode> //
9 // Procedure number: 23 //
10 // File name : SC324_p23.prc //
11 // State Diagram : main(FSM1) //
12 // Start State : main03 //
13 // End State : main03 //
14 // Input Data : InData_Key[8] //
15 // : InData_IV[4] //
16 // : InData_Text[MAX_CNT] //
17 // Output Data : OutData_Text[MAX_CNT] //
18 // : (MAX_CNT is Multiples of four.) //
19 // OutData_IV[4] //
20 // Return Value : Pass, Fail or Resource_Conflict //
21 // ------------------------------------------------------------------//
22 // total cycle : polling + write access + read access //
23 // polling : //
24 // polling access : //
25 // write access : //
26 // read access : //
27 //////////////////////////////////////////////////////////////////////
28
29 #include "sc324_aes_private.h"
30 #include "hw_sce_aes_private.h"
31
32 /*******************************************************************************************************************//**
33 * AES-256 Decryption CBC Mode
34 *
35 * @param[in] InData_Key In data key
36 * @param[in] InData_IV In data iv
37 * @param[in] num_words The number words
38 * @param[in] InData_Text In data text
39 * @param OutData_Text The out data text
40 * @param OutData_IV The out data iv
41 *
42 * @retval FSP_SUCCESS The operation completed successfully.
43 * @retval FSP_ERR_CRYPTO_INVALID_SIZE The size of the data must be multiples of 4 WORDS / 16 bytes.
44 **********************************************************************************************************************/
HW_SCE_AES_256CbcDecrypt(const uint32_t * InData_Key,const uint32_t * InData_IV,const uint32_t num_words,const uint32_t * InData_Text,uint32_t * OutData_Text,uint32_t * OutData_IV)45 fsp_err_t HW_SCE_AES_256CbcDecrypt (const uint32_t * InData_Key,
46 const uint32_t * InData_IV,
47 const uint32_t num_words,
48 const uint32_t * InData_Text,
49 uint32_t * OutData_Text,
50 uint32_t * OutData_IV)
51 {
52 hw_sc324_aes_ctrl_t aesCtrl;
53
54 aesCtrl.encrypt_flag = SC324_AES_DECRYPT;
55 aesCtrl.keysize = SC324_AES_KEYSIZE_256;
56 aesCtrl.mode = SC324_AES_CBC;
57
58 return hw_sc324_aes_kernel_process_data(&aesCtrl,
59 InData_Key,
60 InData_IV,
61 num_words,
62 InData_Text,
63 OutData_Text,
64 OutData_IV);
65 }
66
