1/* LibTomCrypt, modular cryptographic library -- Tom St Denis 2 * 3 * LibTomCrypt is a library that provides various cryptographic 4 * algorithms in a highly modular and flexible manner. 5 * 6 * The library is free for all purposes without any express 7 * guarantee it works. 8 * 9 * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com 10 */ 11#include "tomcrypt.h" 12 13/** 14 @file pmac_file.c 15 PMAC implementation, process a file, by Tom St Denis 16*/ 17 18#ifdef LTC_PMAC 19 20/** 21 PMAC a file 22 @param cipher The index of the cipher desired 23 @param key The secret key 24 @param keylen The length of the secret key (octets) 25 @param filename The name of the file to send through PMAC 26 @param out [out] Destination for the authentication tag 27 @param outlen [in/out] Max size and resulting size of the authentication tag 28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled 29*/ 30int pmac_file(int cipher, 31 const unsigned char *key, unsigned long keylen, 32 const char *filename, 33 unsigned char *out, unsigned long *outlen) 34{ 35#ifdef LTC_NO_FILE 36 return CRYPT_NOP; 37#else 38 int err, x; 39 pmac_state pmac; 40 FILE *in; 41 unsigned char buf[512]; 42 43 44 LTC_ARGCHK(key != NULL); 45 LTC_ARGCHK(filename != NULL); 46 LTC_ARGCHK(out != NULL); 47 LTC_ARGCHK(outlen != NULL); 48 49 in = fopen(filename, "rb"); 50 if (in == NULL) { 51 return CRYPT_FILE_NOTFOUND; 52 } 53 54 if ((err = pmac_init(&pmac, cipher, key, keylen)) != CRYPT_OK) { 55 fclose(in); 56 return err; 57 } 58 59 do { 60 x = fread(buf, 1, sizeof(buf), in); 61 if ((err = pmac_process(&pmac, buf, x)) != CRYPT_OK) { 62 fclose(in); 63 return err; 64 } 65 } while (x == sizeof(buf)); 66 fclose(in); 67 68 if ((err = pmac_done(&pmac, out, outlen)) != CRYPT_OK) { 69 return err; 70 } 71 72#ifdef LTC_CLEAN_STACK 73 zeromem(buf, sizeof(buf)); 74#endif 75 76 return CRYPT_OK; 77#endif 78} 79 80#endif 81 82/* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_file.c,v $ */ 83/* $Revision: 1.5 $ */ 84/* $Date: 2006/11/03 00:39:49 $ */ 85