1 /**
2  * \file gcm_alt.h.h
3  *
4  * \brief This file contains GCM definitions and functions.
5  *
6  * The Galois/Counter Mode (GCM) for 128-bit block ciphers is defined
7  * in <em>D. McGrew, J. Viega, The Galois/Counter Mode of Operation
8  * (GCM), Natl. Inst. Stand. Technol.</em>
9  *
10  * For more information on GCM, see <em>NIST SP 800-38D: Recommendation for
11  * Block Cipher Modes of Operation: Galois/Counter Mode (GCM) and GMAC</em>.
12  *
13  */
14 /*
15  *  Copyright The Mbed TLS Contributors
16  *  Copyright (C) 2021, STMicroelectronics, All Rights Reserved
17  *  SPDX-License-Identifier: Apache-2.0
18  *
19  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
20  *  not use this file except in compliance with the License.
21  *  You may obtain a copy of the License at
22  *
23  *  http://www.apache.org/licenses/LICENSE-2.0
24  *
25  *  Unless required by applicable law or agreed to in writing, software
26  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
27  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
28  *  See the License for the specific language governing permissions and
29  *  limitations under the License.
30  *
31  *  This file implements ST GCM HW services based on API from mbed TLS
32  */
33 #ifndef MBEDTLS_GCM_ALT_H
34 #define MBEDTLS_GCM_ALT_H
35 
36 #if defined(MBEDTLS_GCM_ALT)
37 #include "stm32hal.h"
38 
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
43 /**
44  * \brief          AES context structure
45  *
46  */
47 typedef struct mbedtls_gcm_context
48 {
49     uint32_t gcm_key[8];                  /* Encryption/Decryption key           */
50     CRYP_HandleTypeDef hcryp_gcm;         /* HW driver handle                    */
51     uint32_t ctx_save_cr;                 /* Saved HW context for multi-instance */
52     uint64_t len;                         /* total length of the encrypted data. */
53 
54     uint64_t HL[16];                   /*!< Precalculated HTable low. */
55     uint64_t HH[16];                   /*!< Precalculated HTable high. */
56     uint64_t add_len;                  /*!< The total length of the additional data. */
57     unsigned char base_ectr[16];       /*!< The first ECTR for tag. */
58     unsigned char y[16];               /*!< The Y working value. */
59     unsigned char buf[16];             /*!< The buf working value. */
60 
61     int mode;                             /* The operation to perform:
62                                                #MBEDTLS_GCM_ENCRYPT or
63                                                #MBEDTLS_GCM_DECRYPT.             */
64 }
65 mbedtls_gcm_context;
66 
67 #ifdef __cplusplus
68 }
69 #endif
70 
71 #endif /* MBEDTLS_GCM_ALT */
72 
73 #endif /* MBEDTLS_GCM_ALT_H */
74