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1/* SPDX-License-Identifier: GPL-2.0 */2 3#ifndef _CRYPTO_INTERNAL_CHACHA_H4#define _CRYPTO_INTERNAL_CHACHA_H5 6#include <crypto/chacha.h>7#include <crypto/internal/skcipher.h>8#include <linux/crypto.h>9 10struct chacha_ctx {11 u32 key[8];12 int nrounds;13};14 15static inline int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key,16 unsigned int keysize, int nrounds)17{18 struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm);19 int i;20 21 if (keysize != CHACHA_KEY_SIZE)22 return -EINVAL;23 24 for (i = 0; i < ARRAY_SIZE(ctx->key); i++)25 ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32));26 27 ctx->nrounds = nrounds;28 return 0;29}30 31static inline int chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key,32 unsigned int keysize)33{34 return chacha_setkey(tfm, key, keysize, 20);35}36 37static inline int chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key,38 unsigned int keysize)39{40 return chacha_setkey(tfm, key, keysize, 12);41}42 43#endif /* _CRYPTO_CHACHA_H */44