1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun
3*4882a593Smuzhiyun #ifndef _CRYPTO_INTERNAL_CHACHA_H
4*4882a593Smuzhiyun #define _CRYPTO_INTERNAL_CHACHA_H
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <crypto/chacha.h>
7*4882a593Smuzhiyun #include <crypto/internal/skcipher.h>
8*4882a593Smuzhiyun #include <linux/crypto.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun struct chacha_ctx {
11*4882a593Smuzhiyun u32 key[8];
12*4882a593Smuzhiyun int nrounds;
13*4882a593Smuzhiyun };
14*4882a593Smuzhiyun
chacha_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keysize,int nrounds)15*4882a593Smuzhiyun static inline int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key,
16*4882a593Smuzhiyun unsigned int keysize, int nrounds)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);
19*4882a593Smuzhiyun int i;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun if (keysize != CHACHA_KEY_SIZE)
22*4882a593Smuzhiyun return -EINVAL;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(ctx->key); i++)
25*4882a593Smuzhiyun ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun ctx->nrounds = nrounds;
28*4882a593Smuzhiyun return 0;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
chacha20_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keysize)31*4882a593Smuzhiyun static inline int chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,
32*4882a593Smuzhiyun unsigned int keysize)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun return chacha_setkey(tfm, key, keysize, 20);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
chacha12_setkey(struct crypto_skcipher * tfm,const u8 * key,unsigned int keysize)37*4882a593Smuzhiyun static inline int chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,
38*4882a593Smuzhiyun unsigned int keysize)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun return chacha_setkey(tfm, key, keysize, 12);
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #endif /* _CRYPTO_CHACHA_H */
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