include/crypto/poly1305.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Common values for the Poly1305 algorithm
   4  */
   5
   6 #ifndef _CRYPTO_POLY1305_H
   7 #define _CRYPTO_POLY1305_H
   8
   9 #include <linux/types.h>
  10 #include <linux/crypto.h>
  11
  12 #define POLY1305_BLOCK_SIZE     16
  13 #define POLY1305_KEY_SIZE       32
  14 #define POLY1305_DIGEST_SIZE    16
  15
  16 struct poly1305_desc_ctx {
  17         /* key */
  18         u32 r[5];
  19         /* finalize key */
  20         u32 s[4];
  21         /* accumulator */
  22         u32 h[5];
  23         /* partial buffer */
  24         u8 buf[POLY1305_BLOCK_SIZE];
  25         /* bytes used in partial buffer */
  26         unsigned int buflen;
  27         /* r key has been set */
  28         bool rset;
  29         /* s key has been set */
  30         bool sset;
  31 };
  32
  33 int crypto_poly1305_init(struct shash_desc *desc);
  34 int crypto_poly1305_setkey(struct crypto_shash *tfm,
  35                            const u8 *key, unsigned int keylen);
  36 unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
  37                                         const u8 *src, unsigned int srclen);
  38 int crypto_poly1305_update(struct shash_desc *desc,
  39                            const u8 *src, unsigned int srclen);
  40 int crypto_poly1305_final(struct shash_desc *desc, u8 *dst);
  41
  42 #endif