2 * Common values for the ChaCha20 algorithm
5 #ifndef _CRYPTO_CHACHA20_H
6 #define _CRYPTO_CHACHA20_H
8 #include <linux/types.h>
9 #include <linux/crypto.h>
11 #define CHACHA20_IV_SIZE 16
12 #define CHACHA20_KEY_SIZE 32
13 #define CHACHA20_BLOCK_SIZE 64
19 void chacha20_block(u32 *state, u8 *stream);
20 void crypto_chacha20_init(u32 *state, struct chacha20_ctx *ctx, u8 *iv);
21 int crypto_chacha20_setkey(struct crypto_tfm *tfm, const u8 *key,
22 unsigned int keysize);
23 int crypto_chacha20_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
24 struct scatterlist *src, unsigned int nbytes);
26 enum chacha_constants { /* expand 32-byte k */
27 CHACHA_CONSTANT_EXPA = 0x61707865U,
28 CHACHA_CONSTANT_ND_3 = 0x3320646eU,
29 CHACHA_CONSTANT_2_BY = 0x79622d32U,
30 CHACHA_CONSTANT_TE_K = 0x6b206574U
33 static inline void chacha_init_consts(u32 *state)
35 state[0] = CHACHA_CONSTANT_EXPA;
36 state[1] = CHACHA_CONSTANT_ND_3;
37 state[2] = CHACHA_CONSTANT_2_BY;
38 state[3] = CHACHA_CONSTANT_TE_K;