#ifndef _CRYPTO_TWOFISH_H
  #define _CRYPTO_TWOFISH_H
  
  #include <linux/types.h>
  
  #define TF_MIN_KEY_SIZE 16
  #define TF_MAX_KEY_SIZE 32
  #define TF_BLOCK_SIZE 16
  
  struct crypto_tfm;
  
  /* Structure for an expanded Twofish key.  s contains the key-dependent
   * S-boxes composed with the MDS matrix; w contains the eight "whitening"
   * subkeys, K[0] through K[7].	k holds the remaining, "round" subkeys.  Note
   * that k[i] corresponds to what the Twofish paper calls K[i+8]. */
  struct twofish_ctx {
  	u32 s[4][256], w[8], k[32];
  };

  int __twofish_setkey(struct twofish_ctx *ctx, const u8 *key,
  		     unsigned int key_len, u32 *flags);

  int twofish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int key_len);

  
  #endif