poly1305.h

00001 /* poly1305.h
00002  *
00003  * Copyright (C) 2006-2016 wolfSSL Inc.
00004  *
00005  * This file is part of wolfSSL.
00006  *
00007  * wolfSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * wolfSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
00020  */
00021 
00022 
00023 #ifndef WOLF_CRYPT_POLY1305_H
00024 #define WOLF_CRYPT_POLY1305_H
00025 
00026 #include <wolfssl/wolfcrypt/types.h>
00027 
00028 #ifdef HAVE_POLY1305
00029 
00030 #ifdef __cplusplus
00031     extern "C" {
00032 #endif
00033 
00034 /* auto detect between 32bit / 64bit */
00035 #if defined(__SIZEOF_INT128__) && defined(__LP64__)
00036 #define WC_HAS_SIZEOF_INT128_64BIT
00037 #endif
00038 
00039 #if defined(_MSC_VER) && defined(_M_X64)
00040 #define WC_HAS_MSVC_64BIT
00041 #endif
00042 
00043 #if (defined(__GNUC__) && defined(__LP64__) && \
00044         ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 4))))
00045 #define WC_HAS_GCC_4_4_64BIT
00046 #endif
00047 
00048 #if (defined(WC_HAS_SIZEOF_INT128_64BIT) || defined(WC_HAS_MSVC_64BIT) ||  \
00049      defined(WC_HAS_GCC_4_4_64BIT))
00050 #define POLY130564
00051 #else
00052 #define POLY130532
00053 #endif
00054 
00055 enum {
00056     POLY1305 = 7,
00057     POLY1305_BLOCK_SIZE = 16,
00058     POLY1305_DIGEST_SIZE = 16,
00059 };
00060 
00061 #define WC_POLY1305_PAD_SZ 16
00062 #define WC_POLY1305_MAC_SZ 16
00063 
00064 /* Poly1305 state */
00065 typedef struct Poly1305 {
00066 #if defined(POLY130564)
00067     word64 r[3];
00068     word64 h[3];
00069     word64 pad[2];
00070 #else
00071     word32 r[5];
00072     word32 h[5];
00073     word32 pad[4];
00074 #endif
00075     size_t leftover;
00076     unsigned char buffer[POLY1305_BLOCK_SIZE];
00077     unsigned char final;
00078 } Poly1305;
00079 
00080 
00081 /* does init */
00082 
00083 WOLFSSL_API int wc_Poly1305SetKey(Poly1305* poly1305, const byte* key, word32 kySz);
00084 WOLFSSL_API int wc_Poly1305Update(Poly1305* poly1305, const byte*, word32);
00085 WOLFSSL_API int wc_Poly1305Final(Poly1305* poly1305, byte* tag);
00086 WOLFSSL_API int wc_Poly1305_MAC(Poly1305* ctx, byte* additional, word32 addSz,
00087                                byte* input, word32 sz, byte* tag, word32 tagSz);
00088 #ifdef __cplusplus
00089     } /* extern "C" */
00090 #endif
00091 
00092 #endif /* HAVE_POLY1305 */
00093 #endif /* WOLF_CRYPT_POLY1305_H */
00094 
00095