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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"
#ifndef LTC_NO_FILE
/**
@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)
{
hash_state md;
unsigned char *buf;
size_t x;
int err;
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
LTC_ARGCHK(in != NULL);
if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
return CRYPT_MEM;
}
if ((err = hash_is_valid(hash)) != CRYPT_OK) {
goto LBL_ERR;
}
if (*outlen < hash_descriptor[hash].hashsize) {
*outlen = hash_descriptor[hash].hashsize;
err = CRYPT_BUFFER_OVERFLOW;
goto LBL_ERR;
}
if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
goto LBL_ERR;
}
do {
x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
if ((err = hash_descriptor[hash].process(&md, buf, (unsigned long)x)) != CRYPT_OK) {
goto LBL_CLEANBUF;
}
} while (x == LTC_FILE_READ_BUFSIZE);
if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
*outlen = hash_descriptor[hash].hashsize;
}
LBL_CLEANBUF:
zeromem(buf, LTC_FILE_READ_BUFSIZE);
LBL_ERR:
XFREE(buf);
return err;
}
#endif /* #ifndef LTC_NO_FILE */
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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