1 // SPDX-License-Identifier: GPL-2.0-or-later 1
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_c
13 #include <crypto/chacha.h>
14
15 void chacha_crypt_generic(u32 *state, u8 *dst,
16 unsigned int bytes,
17 {
18 /* aligned to potentially speed up cry
19 u8 stream[CHACHA_BLOCK_SIZE] __aligned
20
21 while (bytes >= CHACHA_BLOCK_SIZE) {
22 chacha_block_generic(state, st
23 crypto_xor_cpy(dst, src, strea
24 bytes -= CHACHA_BLOCK_SIZE;
25 dst += CHACHA_BLOCK_SIZE;
26 src += CHACHA_BLOCK_SIZE;
27 }
28 if (bytes) {
29 chacha_block_generic(state, st
30 crypto_xor_cpy(dst, src, strea
31 }
32 }
33 EXPORT_SYMBOL(chacha_crypt_generic);
34
35 MODULE_DESCRIPTION("ChaCha stream cipher (RFC7
36 MODULE_LICENSE("GPL");
37
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