chacha.h (969B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2 3#ifndef _CRYPTO_INTERNAL_CHACHA_H 4#define _CRYPTO_INTERNAL_CHACHA_H 5 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 */