1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Common values for the ChaCha20 algorithm
6 #ifndef _CRYPTO_CHACHA20_H
7 #define _CRYPTO_CHACHA20_H
9 #include <crypto/skcipher.h>
10 #include <linux/types.h>
11 #include <linux/crypto.h>
13 #define CHACHA20_IV_SIZE 16
14 #define CHACHA20_KEY_SIZE 32
15 #define CHACHA20_BLOCK_SIZE 64
21 void chacha20_block(u32 *state, u8 *stream);
22 void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
23 int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
24 unsigned int keysize);
25 int crypto_chacha20_crypt(struct skcipher_request *req);
27 enum chacha_constants { /* expand 32-byte k */
28 CHACHA_CONSTANT_EXPA = 0x61707865U,
29 CHACHA_CONSTANT_ND_3 = 0x3320646eU,
30 CHACHA_CONSTANT_2_BY = 0x79622d32U,
31 CHACHA_CONSTANT_TE_K = 0x6b206574U
34 static inline void chacha_init_consts(u32 *state)
36 state[0] = CHACHA_CONSTANT_EXPA;
37 state[1] = CHACHA_CONSTANT_ND_3;
38 state[2] = CHACHA_CONSTANT_2_BY;
39 state[3] = CHACHA_CONSTANT_TE_K;