andre@0: /*
andre@0:  * poly1305.h - header file for Poly1305 implementation.
andre@0:  *
andre@0:  * This Source Code Form is subject to the terms of the Mozilla Public
andre@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
andre@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
andre@0: 
andre@0: #ifndef FREEBL_POLY1305_H_
andre@0: #define FREEBL_POLY1305_H_
andre@0: 
andre@0: typedef unsigned char poly1305_state[512];
andre@0: 
andre@0: /* Poly1305Init sets up |state| so that it can be used to calculate an
andre@0:  * authentication tag with the one-time key |key|. Note that |key| is a
andre@0:  * one-time key and therefore there is no `reset' method because that would
andre@0:  * enable several messages to be authenticated with the same key. */
andre@0: extern void Poly1305Init(poly1305_state* state,
andre@0: 			 const unsigned char key[32]);
andre@0: 
andre@0: /* Poly1305Update processes |in_len| bytes from |in|. It can be called zero or
andre@0:  * more times after poly1305_init. */
andre@0: extern void Poly1305Update(poly1305_state* state,
andre@0: 			   const unsigned char *in,
andre@0: 			   size_t inLen);
andre@0: 
andre@0: /* Poly1305Finish completes the poly1305 calculation and writes a 16 byte
andre@0:  * authentication tag to |mac|. */
andre@0: extern void Poly1305Finish(poly1305_state* state,
andre@0: 			   unsigned char mac[16]);
andre@0: 
andre@0: #endif  /* FREEBL_POLY1305_H_ */