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comparison src/hashes/helper/hash_filehandle.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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143:5d99163f7e32 191:1c15b283127b
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file hash_filehandle.c
15 Hash open files, Tom St Denis
16 */
17
18 /**
19 Hash data from an open file handle.
20 @param hash The index of the hash you want to use
21 @param in The FILE* handle of the file you want to hash
22 @param out [out] The destination of the digest
23 @param outlen [in/out] The max size and resulting size of the digest
24 @result CRYPT_OK if successful
25 */
26 int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
27 {
28 #ifdef LTC_NO_FILE
29 return CRYPT_NOP;
30 #else
31 hash_state md;
32 unsigned char buf[512];
33 size_t x;
34 int err;
35
36 LTC_ARGCHK(out != NULL);
37 LTC_ARGCHK(outlen != NULL);
38 LTC_ARGCHK(in != NULL);
39
40 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
41 return err;
42 }
43
44 if (*outlen < hash_descriptor[hash].hashsize) {
45 return CRYPT_BUFFER_OVERFLOW;
46 }
47 if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
48 return err;
49 }
50
51 *outlen = hash_descriptor[hash].hashsize;
52 do {
53 x = fread(buf, 1, sizeof(buf), in);
54 if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) {
55 return err;
56 }
57 } while (x == sizeof(buf));
58 err = hash_descriptor[hash].done(&md, out);
59
60 #ifdef LTC_CLEAN_STACK
61 zeromem(buf, sizeof(buf));
62 #endif
63 return err;
64 #endif
65 }
66