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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.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
*/
#include "tomcrypt.h"
/**
@file hash_filehandle.c
Hash open files, Tom St Denis
*/
/**
Hash data from an open file handle.
@param hash The index of the hash you want to use
@param in The FILE* handle of the file you want to hash
@param out [out] The destination of the digest
@param outlen [in/out] The max size and resulting size of the digest
@result CRYPT_OK if successful
*/
int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
{
#ifdef LTC_NO_FILE
return CRYPT_NOP;
#else
hash_state md;
unsigned char buf[512];
size_t x;
int err;
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
LTC_ARGCHK(in != NULL);
if ((err = hash_is_valid(hash)) != CRYPT_OK) {
return err;
}
if (*outlen < hash_descriptor[hash].hashsize) {
return CRYPT_BUFFER_OVERFLOW;
}
if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
return err;
}
*outlen = hash_descriptor[hash].hashsize;
do {
x = fread(buf, 1, sizeof(buf), in);
if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) {
return err;
}
} while (x == sizeof(buf));
err = hash_descriptor[hash].done(&md, out);
#ifdef LTC_CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return err;
#endif
}
/* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_filehandle.c,v $ */
/* $Revision: 1.3 $ */
/* $Date: 2005/05/05 14:35:58 $ */
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