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 (at) gmail.com, http://libtomcrypt.com 10 */ 11 #include "tomcrypt.h" 12 13 /** 14 @file f9_file.c 15 f9 support, process a file, Tom St Denis 16 */ 17 18 #ifdef LTC_F9_MODE 19 20 /** 21 f9 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 you wish to f9 26 @param out [out] Where the authentication tag is to be stored 27 @param outlen [in/out] The max size and resulting size of the authentication tag 28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled 29 */ 30 int f9_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 f9_state f9; 40 FILE *in; 41 unsigned char buf[512]; 42 43 LTC_ARGCHK(key != NULL); 44 LTC_ARGCHK(filename != NULL); 45 LTC_ARGCHK(out != NULL); 46 LTC_ARGCHK(outlen != NULL); 47 48 in = fopen(filename, "rb"); 49 if (in == NULL) { 50 return CRYPT_FILE_NOTFOUND; 51 } 52 53 if ((err = f9_init(&f9, cipher, key, keylen)) != CRYPT_OK) { 54 fclose(in); 55 return err; 56 } 57 58 do { 59 x = fread(buf, 1, sizeof(buf), in); 60 if ((err = f9_process(&f9, buf, x)) != CRYPT_OK) { 61 fclose(in); 62 return err; 63 } 64 } while (x == sizeof(buf)); 65 fclose(in); 66 67 if ((err = f9_done(&f9, out, outlen)) != CRYPT_OK) { 68 return err; 69 } 70 71 #ifdef LTC_CLEAN_STACK 72 zeromem(buf, sizeof(buf)); 73 #endif 74 75 return CRYPT_OK; 76 #endif 77 } 78 79 #endif 80 81 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_file.c,v $ */ 82 /* $Revision: 1.4 $ */ 83 /* $Date: 2006/11/21 00:18:23 $ */ 84
