2 * crypto backend implementation
4 * Copyright (C) 2010-2023 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2010-2023 Milan Broz
7 * This file is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This file is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this file; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #ifndef _CRYPTO_BACKEND_INTERNAL_H
22 #define _CRYPTO_BACKEND_INTERNAL_H
24 #include "crypto_backend.h"
26 /* internal PBKDF2 implementation */
27 int pkcs5_pbkdf2(const char *hash,
28 const char *P, size_t Plen,
29 const char *S, size_t Slen,
31 unsigned int dkLen, char *DK,
32 unsigned int hash_block_size);
34 /* Argon2 implementation wrapper */
35 int argon2(const char *type, const char *password, size_t password_length,
36 const char *salt, size_t salt_length,
37 char *key, size_t key_length,
38 uint32_t iterations, uint32_t memory, uint32_t parallel);
40 /* Block ciphers: fallback to kernel crypto API */
42 struct crypt_cipher_kernel {
47 int crypt_cipher_init_kernel(struct crypt_cipher_kernel *ctx, const char *name,
48 const char *mode, const void *key, size_t key_length);
49 int crypt_cipher_encrypt_kernel(struct crypt_cipher_kernel *ctx,
50 const char *in, char *out, size_t length,
51 const char *iv, size_t iv_length);
52 int crypt_cipher_decrypt_kernel(struct crypt_cipher_kernel *ctx,
53 const char *in, char *out, size_t length,
54 const char *iv, size_t iv_length);
55 void crypt_cipher_destroy_kernel(struct crypt_cipher_kernel *ctx);
56 int crypt_bitlk_decrypt_key_kernel(const void *key, size_t key_length,
57 const char *in, char *out, size_t length,
58 const char *iv, size_t iv_length,
59 const char *tag, size_t tag_length);
61 /* Internal implementation for constant time memory comparison */
62 static inline int crypt_internal_memeq(const void *m1, const void *m2, size_t n)
64 const unsigned char *_m1 = (const unsigned char *) m1;
65 const unsigned char *_m2 = (const unsigned char *) m2;
66 unsigned char result = 0;
69 for (i = 0; i < n; i++)
70 result |= _m1[i] ^ _m2[i];
75 #endif /* _CRYPTO_BACKEND_INTERNAL_H */