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5fb8ef25 AB |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * The ChaCha stream cipher (RFC7539) | |
4 | * | |
5 | * Copyright (C) 2015 Martin Willi | |
6 | */ | |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/export.h> | |
10 | #include <linux/module.h> | |
11 | ||
12 | #include <crypto/algapi.h> // for crypto_xor_cpy | |
13 | #include <crypto/chacha.h> | |
14 | ||
15 | void chacha_crypt_generic(u32 *state, u8 *dst, const u8 *src, | |
16 | unsigned int bytes, int nrounds) | |
17 | { | |
18 | /* aligned to potentially speed up crypto_xor() */ | |
19 | u8 stream[CHACHA_BLOCK_SIZE] __aligned(sizeof(long)); | |
20 | ||
21 | while (bytes >= CHACHA_BLOCK_SIZE) { | |
22 | chacha_block_generic(state, stream, nrounds); | |
23 | crypto_xor_cpy(dst, src, stream, CHACHA_BLOCK_SIZE); | |
24 | bytes -= CHACHA_BLOCK_SIZE; | |
25 | dst += CHACHA_BLOCK_SIZE; | |
26 | src += CHACHA_BLOCK_SIZE; | |
27 | } | |
28 | if (bytes) { | |
29 | chacha_block_generic(state, stream, nrounds); | |
30 | crypto_xor_cpy(dst, src, stream, bytes); | |
31 | } | |
32 | } | |
33 | EXPORT_SYMBOL(chacha_crypt_generic); | |
34 | ||
35 | MODULE_LICENSE("GPL"); |