106 lines
3.9 KiB
C
Executable File
106 lines
3.9 KiB
C
Executable File
/*
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SDP_CRYPTO_H_
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#define SDP_CRYPTO_H_
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#include <crypto/aead.h>
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#include <linux/crypto.h>
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#include <linux/init.h>
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#define ROUND_UPX(i, x) (((i)+((x)-1))&~((x)-1))
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#define SDP_CRYPTO_RNG_SEED_SIZE 16
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/* Definitions for AEAD */
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#define AEAD_IV_LEN 12
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#define AEAD_AAD_LEN 16
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#define AEAD_AUTH_LEN 16
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#define AEAD_D32_PACK_DATA_LEN 32
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#define AEAD_D64_PACK_DATA_LEN 64
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#define AEAD_D32_PACK_TOTAL_LEN (AEAD_IV_LEN + AEAD_D32_PACK_DATA_LEN + AEAD_AUTH_LEN)
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#define AEAD_D64_PACK_TOTAL_LEN (AEAD_IV_LEN + AEAD_D64_PACK_DATA_LEN + AEAD_AUTH_LEN)
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#define AEAD_DATA_PACK_MAX_LEN AEAD_D64_PACK_TOTAL_LEN
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struct __aead_data_32_pack {
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unsigned char iv[AEAD_IV_LEN];
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unsigned char data[AEAD_D32_PACK_DATA_LEN];
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unsigned char auth[AEAD_AUTH_LEN];
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};
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struct __aead_data_64_pack {
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unsigned char iv[AEAD_IV_LEN];
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unsigned char data[AEAD_D64_PACK_DATA_LEN];
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unsigned char auth[AEAD_AUTH_LEN];
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};
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/* Default Definitions for AES-GCM crypto */
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typedef struct __aead_data_32_pack gcm_pack32;
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typedef struct __aead_data_64_pack gcm_pack64;
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typedef struct __gcm_pack {
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u32 type;
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u8 *iv;
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u8 *data;
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u8 *auth;
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} gcm_pack;
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#define SDP_CRYPTO_GCM_PACK32 0x01
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#define SDP_CRYPTO_GCM_PACK64 0x02
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#define CONV_TYPE_TO_DLEN(x) (x == SDP_CRYPTO_GCM_PACK32 ? \
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AEAD_D32_PACK_DATA_LEN : x == SDP_CRYPTO_GCM_PACK64 ? \
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AEAD_D64_PACK_DATA_LEN : 0)
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#define CONV_TYPE_TO_PLEN(x) (x == SDP_CRYPTO_GCM_PACK32 ? \
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AEAD_D32_PACK_TOTAL_LEN : x == SDP_CRYPTO_GCM_PACK64 ? \
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AEAD_D64_PACK_TOTAL_LEN : 0)
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#define CONV_DLEN_TO_TYPE(x) (x == AEAD_D32_PACK_DATA_LEN ? \
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SDP_CRYPTO_GCM_PACK32 : x == AEAD_D64_PACK_DATA_LEN ? \
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SDP_CRYPTO_GCM_PACK64 : 0)
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#define CONV_PLEN_TO_TYPE(x) (x == AEAD_D32_PACK_TOTAL_LEN ? \
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SDP_CRYPTO_GCM_PACK32 : x == AEAD_D64_PACK_TOTAL_LEN ? \
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SDP_CRYPTO_GCM_PACK64 : 0)
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#define SDP_CRYPTO_GCM_MAX_PLEN AEAD_DATA_PACK_MAX_LEN
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#define SDP_CRYPTO_GCM_IV_LEN AEAD_IV_LEN
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#define SDP_CRYPTO_GCM_AAD_LEN AEAD_AAD_LEN
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#define SDP_CRYPTO_GCM_AUTH_LEN AEAD_AUTH_LEN
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#define SDP_CRYPTO_GCM_DATA_LEN AEAD_D64_PACK_DATA_LEN
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#define SDP_CRYPTO_GCM_DEFAULT_AAD "PROTECTED_BY_SDP" // Explicitly 16 bytes following SDP_CRYPTO_GCM_AAD_LEN
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#define SDP_CRYPTO_GCM_DEFAULT_KEY_LEN 32
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/* Definitions for Nonce */
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#define MAX_EN_BUF_LEN AEAD_D32_PACK_TOTAL_LEN
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#define SDP_CRYPTO_NEK_LEN SDP_CRYPTO_GCM_DEFAULT_KEY_LEN
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#define SDP_CRYPTO_NEK_DRV_LABEL "NONCE_ENC_KEY"
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#define SDP_CRYPTO_NEK_DRV_CONTEXT "NONCE_FOR_FEK"
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#define SDP_CRYPTO_SHA512_OUTPUT_SIZE 64
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/* Declarations for Open APIs*/
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int sdp_crypto_generate_key(void *raw_key, int nbytes);
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int sdp_crypto_hash_sha512(const u8 *data, u32 data_len, u8 *hashed);
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int sdp_crypto_aes_gcm_encrypt(struct crypto_aead *tfm,
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u8 *data, size_t data_len, u8 *auth, u8 *iv);
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int sdp_crypto_aes_gcm_decrypt(struct crypto_aead *tfm,
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u8 *data, size_t data_len, u8 *auth, u8 *iv);
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int sdp_crypto_aes_gcm_encrypt_pack(struct crypto_aead *tfm, gcm_pack *pack);
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int sdp_crypto_aes_gcm_decrypt_pack(struct crypto_aead *tfm, gcm_pack *pack);
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struct crypto_aead *sdp_crypto_aes_gcm_key_setup(const u8 key[], size_t key_len);
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void sdp_crypto_aes_gcm_key_free(struct crypto_aead *tfm);
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int __init sdp_crypto_init(void);
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void __exit sdp_crypto_exit(void);
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#endif /* SDP_CRYPTO_H_ */
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