Home | History | Annotate | Download | only in openssl
      1 /* Copyright (c) 2014, Google Inc.
      2  *
      3  * Permission to use, copy, modify, and/or distribute this software for any
      4  * purpose with or without fee is hereby granted, provided that the above
      5  * copyright notice and this permission notice appear in all copies.
      6  *
      7  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      8  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      9  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
     10  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     11  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
     12  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
     13  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
     14 
     15 #ifndef OPENSSL_HEADER_POLY1305_H
     16 #define OPENSSL_HEADER_POLY1305_H
     17 
     18 #include <openssl/base.h>
     19 
     20 #ifdef  __cplusplus
     21 extern "C" {
     22 #endif
     23 
     24 
     25 typedef uint8_t poly1305_state[512];
     26 
     27 /* CRYPTO_poly1305_init sets up |state| so that it can be used to calculate an
     28  * authentication tag with the one-time key |key|. Note that |key| is a
     29  * one-time key and therefore there is no `reset' method because that would
     30  * enable several messages to be authenticated with the same key. */
     31 OPENSSL_EXPORT void CRYPTO_poly1305_init(poly1305_state* state,
     32                                          const uint8_t key[32]);
     33 
     34 /* CRYPTO_poly1305_update processes |in_len| bytes from |in|. It can be called
     35  * zero or more times after poly1305_init. */
     36 OPENSSL_EXPORT void CRYPTO_poly1305_update(poly1305_state* state,
     37                                            const uint8_t* in,
     38                                            size_t in_len);
     39 
     40 /* CRYPTO_poly1305_finish completes the poly1305 calculation and writes a 16
     41  * byte authentication tag to |mac|. The |mac| address must be 16-byte
     42  * aligned. */
     43 OPENSSL_EXPORT void CRYPTO_poly1305_finish(poly1305_state* state,
     44                                            uint8_t mac[16]);
     45 
     46 
     47 #if defined(__cplusplus)
     48 }  /* extern C */
     49 #endif
     50 
     51 #endif  /* OPENSSL_HEADER_POLY1305_H */
     52