include/crypto/internal/chacha.h

   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 static 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
  31 static 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
  37 static 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 */