1 /* $OpenBSD: umac.h,v 1.1 2007/06/07 19:37:34 pvalchev Exp $ */ 2 /* ----------------------------------------------------------------------- 3 * 4 * umac.h -- C Implementation UMAC Message Authentication 5 * 6 * Version 0.93a of rfc4418.txt -- 2006 July 14 7 * 8 * For a full description of UMAC message authentication see the UMAC 9 * world-wide-web page at http://www.cs.ucdavis.edu/~rogaway/umac 10 * Please report bugs and suggestions to the UMAC webpage. 11 * 12 * Copyright (c) 1999-2004 Ted Krovetz 13 * 14 * Permission to use, copy, modify, and distribute this software and 15 * its documentation for any purpose and with or without fee, is hereby 16 * granted provided that the above copyright notice appears in all copies 17 * and in supporting documentation, and that the name of the copyright 18 * holder not be used in advertising or publicity pertaining to 19 * distribution of the software without specific, written prior permission. 20 * 21 * Comments should be directed to Ted Krovetz (tdk (at) acm.org) 22 * 23 * ---------------------------------------------------------------------- */ 24 25 /* ////////////////////// IMPORTANT NOTES ///////////////////////////////// 26 * 27 * 1) This version does not work properly on messages larger than 16MB 28 * 29 * 2) If you set the switch to use SSE2, then all data must be 16-byte 30 * aligned 31 * 32 * 3) When calling the function umac(), it is assumed that msg is in 33 * a writable buffer of length divisible by 32 bytes. The message itself 34 * does not have to fill the entire buffer, but bytes beyond msg may be 35 * zeroed. 36 * 37 * 4) Two free AES implementations are supported by this implementation of 38 * UMAC. Paulo Barreto's version is in the public domain and can be found 39 * at http://www.esat.kuleuven.ac.be/~rijmen/rijndael/ (search for 40 * "Barreto"). The only two files needed are rijndael-alg-fst.c and 41 * rijndael-alg-fst.h. 42 * Brian Gladman's version is distributed with GNU Public lisence 43 * and can be found at http://fp.gladman.plus.com/AES/index.htm. It 44 * includes a fast IA-32 assembly version. 45 * 46 /////////////////////////////////////////////////////////////////////// */ 47 #ifndef HEADER_UMAC_H 48 #define HEADER_UMAC_H 49 50 51 #ifdef __cplusplus 52 extern "C" { 53 #endif 54 55 struct umac_ctx *umac_new(u_char key[]); 56 /* Dynamically allocate a umac_ctx struct, initialize variables, 57 * generate subkeys from key. 58 */ 59 60 #if 0 61 int umac_reset(struct umac_ctx *ctx); 62 /* Reset a umac_ctx to begin authenicating a new message */ 63 #endif 64 65 int umac_update(struct umac_ctx *ctx, u_char *input, long len); 66 /* Incorporate len bytes pointed to by input into context ctx */ 67 68 int umac_final(struct umac_ctx *ctx, u_char tag[], u_char nonce[8]); 69 /* Incorporate any pending data and the ctr value, and return tag. 70 * This function returns error code if ctr < 0. 71 */ 72 73 int umac_delete(struct umac_ctx *ctx); 74 /* Deallocate the context structure */ 75 76 #if 0 77 int umac(struct umac_ctx *ctx, u_char *input, 78 long len, u_char tag[], 79 u_char nonce[8]); 80 /* All-in-one implementation of the functions Reset, Update and Final */ 81 #endif 82 83 /* uhash.h */ 84 85 86 #if 0 87 typedef struct uhash_ctx *uhash_ctx_t; 88 /* The uhash_ctx structure is defined by the implementation of the */ 89 /* UHASH functions. */ 90 91 uhash_ctx_t uhash_alloc(u_char key[16]); 92 /* Dynamically allocate a uhash_ctx struct and generate subkeys using */ 93 /* the kdf and kdf_key passed in. If kdf_key_len is 0 then RC6 is */ 94 /* used to generate key with a fixed key. If kdf_key_len > 0 but kdf */ 95 /* is NULL then the first 16 bytes pointed at by kdf_key is used as a */ 96 /* key for an RC6 based KDF. */ 97 98 int uhash_free(uhash_ctx_t ctx); 99 100 int uhash_set_params(uhash_ctx_t ctx, 101 void *params); 102 103 int uhash_reset(uhash_ctx_t ctx); 104 105 int uhash_update(uhash_ctx_t ctx, 106 u_char *input, 107 long len); 108 109 int uhash_final(uhash_ctx_t ctx, 110 u_char ouput[]); 111 112 int uhash(uhash_ctx_t ctx, 113 u_char *input, 114 long len, 115 u_char output[]); 116 117 #endif 118 119 #ifdef __cplusplus 120 } 121 #endif 122 123 #endif /* HEADER_UMAC_H */ 124