| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| * |
| * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org |
| */ |
| #include "tomcrypt.h" |
| |
| /** |
| @file pmac_file.c |
| PMAC implementation, process a file, by Tom St Denis |
| */ |
| |
| #ifdef PMAC |
| |
| /** |
| PMAC a file |
| @param cipher The index of the cipher desired |
| @param key The secret key |
| @param keylen The length of the secret key (octets) |
| @param filename The name of the file to send through PMAC |
| @param out [out] Destination for the authentication tag |
| @param outlen [in/out] Max size and resulting size of the authentication tag |
| @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled |
| */ |
| int pmac_file(int cipher, |
| const unsigned char *key, unsigned long keylen, |
| const char *filename, |
| unsigned char *out, unsigned long *outlen) |
| { |
| #ifdef LTC_NO_FILE |
| return CRYPT_NOP; |
| #else |
| int err, x; |
| pmac_state pmac; |
| FILE *in; |
| unsigned char buf[512]; |
| |
| |
| LTC_ARGCHK(key != NULL); |
| LTC_ARGCHK(filename != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| in = fopen(filename, "rb"); |
| if (in == NULL) { |
| return CRYPT_FILE_NOTFOUND; |
| } |
| |
| if ((err = pmac_init(&pmac, cipher, key, keylen)) != CRYPT_OK) { |
| fclose(in); |
| return err; |
| } |
| |
| do { |
| x = fread(buf, 1, sizeof(buf), in); |
| if ((err = pmac_process(&pmac, buf, x)) != CRYPT_OK) { |
| fclose(in); |
| return err; |
| } |
| } while (x == sizeof(buf)); |
| fclose(in); |
| |
| if ((err = pmac_done(&pmac, out, outlen)) != CRYPT_OK) { |
| return err; |
| } |
| |
| #ifdef LTC_CLEAN_STACK |
| zeromem(buf, sizeof(buf)); |
| #endif |
| |
| return CRYPT_OK; |
| #endif |
| } |
| |
| #endif |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/mac/pmac/pmac_file.c,v $ */ |
| /* $Revision: 1.3 $ */ |
| /* $Date: 2005/05/05 14:35:59 $ */ |