+
−/* 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: $Format:%ai$ */