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 10 struct chacha_ctx { 11 u32 key[8]; 12 int nrounds; 13 }; 14 15 void crypto_chacha_init(u32 *state, const struct chacha_ctx *ctx, const u8 *iv); 16 17 static inline int chacha_setkey(struct crypto_skcipher *tfm, const u8 *key, 18 unsigned int keysize, int nrounds) 19 { 20 struct chacha_ctx *ctx = crypto_skcipher_ctx(tfm); 21 int i; 22 23 if (keysize != CHACHA_KEY_SIZE) 24 return -EINVAL; 25 26 for (i = 0; i < ARRAY_SIZE(ctx->key); i++) 27 ctx->key[i] = get_unaligned_le32(key + i * sizeof(u32)); 28 29 ctx->nrounds = nrounds; 30 return 0; 31 } 32 33 static inline int chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key, 34 unsigned int keysize) 35 { 36 return chacha_setkey(tfm, key, keysize, 20); 37 } 38 39 static int inline chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key, 40 unsigned int keysize) 41 { 42 return chacha_setkey(tfm, key, keysize, 12); 43 } 44 45 int crypto_chacha20_setkey(struct crypto_skcipher *tfm, const u8 *key, 46 unsigned int keysize); 47 int crypto_chacha12_setkey(struct crypto_skcipher *tfm, const u8 *key, 48 unsigned int keysize); 49 50 int crypto_chacha_crypt(struct skcipher_request *req); 51 int crypto_xchacha_crypt(struct skcipher_request *req); 52 53 #endif /* _CRYPTO_CHACHA_H */ 54