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 /* The poly1305_key and poly1305_state types are mostly opaque and
  17  * implementation-defined. Limbs might be in base 2^64 or base 2^26, or
  18  * different yet. The union type provided keeps these 64-bit aligned for the
  19  * case in which this is implemented using 64x64 multiplies.
  20  */
  21
  22 struct poly1305_key {
  23         union {
  24                 u32 r[5];
  25                 u64 r64[3];
  26         };
  27 };
  28
  29 struct poly1305_core_key {
  30         struct poly1305_key key;
  31         struct poly1305_key precomputed_s;
  32 };
  33
  34 struct poly1305_state {
  35         union {
  36                 u32 h[5];
  37                 u64 h64[3];
  38         };
  39 };
  40
  41 struct poly1305_desc_ctx {
  42         /* partial buffer */
  43         u8 buf[POLY1305_BLOCK_SIZE];
  44         /* bytes used in partial buffer */
  45         unsigned int buflen;
  46         /* how many keys have been set in r[] */
  47         unsigned short rset;
  48         /* whether s[] has been set */
  49         bool sset;
  50         /* finalize key */
  51         u32 s[4];
  52         /* accumulator */
  53         struct poly1305_state h;
  54         /* key */
  55         union {
  56                 struct poly1305_key opaque_r[CONFIG_CRYPTO_LIB_POLY1305_RSIZE];
  57                 struct poly1305_core_key core_r;
  58         };
  59 };
  60
  61 void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key);
  62 void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key);
  63
  64 static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key)
  65 {
  66         if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
  67                 poly1305_init_arch(desc, key);
  68         else
  69                 poly1305_init_generic(desc, key);
  70 }
  71
  72 void poly1305_update_arch(struct poly1305_desc_ctx *desc, const u8 *src,
  73                           unsigned int nbytes);
  74 void poly1305_update_generic(struct poly1305_desc_ctx *desc, const u8 *src,
  75                              unsigned int nbytes);
  76
  77 static inline void poly1305_update(struct poly1305_desc_ctx *desc,
  78                                    const u8 *src, unsigned int nbytes)
  79 {
  80         if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
  81                 poly1305_update_arch(desc, src, nbytes);
  82         else
  83                 poly1305_update_generic(desc, src, nbytes);
  84 }
  85
  86 void poly1305_final_arch(struct poly1305_desc_ctx *desc, u8 *digest);
  87 void poly1305_final_generic(struct poly1305_desc_ctx *desc, u8 *digest);
  88
  89 static inline void poly1305_final(struct poly1305_desc_ctx *desc, u8 *digest)
  90 {
  91         if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_POLY1305))
  92                 poly1305_final_arch(desc, digest);
  93         else
  94                 poly1305_final_generic(desc, digest);
  95 }
  96
  97 #endif