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/* 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.
*/
#include "tomcrypt.h"
/**
@file f9_file.c
f9 support, process a file, Tom St Denis
*/
#ifdef LTC_F9_MODE
/**
f9 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 fname The name of the file you wish to f9
@param out [out] Where the authentication tag is to be stored
@param outlen [in/out] The max size and resulting size of the authentication tag
@return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
*/
int f9_file(int cipher,
const unsigned char *key, unsigned long keylen,
const char *fname,
unsigned char *out, unsigned long *outlen)
{
#ifdef LTC_NO_FILE
return CRYPT_NOP;
#else
size_t x;
int err;
f9_state f9;
FILE *in;
unsigned char *buf;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(fname != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
return CRYPT_MEM;
}
if ((err = f9_init(&f9, cipher, key, keylen)) != CRYPT_OK) {
goto LBL_ERR;
}
in = fopen(fname, "rb");
if (in == NULL) {
err = CRYPT_FILE_NOTFOUND;
goto LBL_ERR;
}
do {
x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
if ((err = f9_process(&f9, buf, (unsigned long)x)) != CRYPT_OK) {
fclose(in);
goto LBL_CLEANBUF;
}
} while (x == LTC_FILE_READ_BUFSIZE);
if (fclose(in) != 0) {
err = CRYPT_ERROR;
goto LBL_CLEANBUF;
}
err = f9_done(&f9, out, outlen);
LBL_CLEANBUF:
zeromem(buf, LTC_FILE_READ_BUFSIZE);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(&f9, sizeof(f9_state));
#endif
XFREE(buf);
return err;
#endif
}
#endif
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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