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comparison libtomcrypt/src/hashes/helper/hash_filehandle.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
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
67
68 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/helper/hash_filehandle.c,v $ */
69 /* $Revision: 1.3 $ */
70 /* $Date: 2005/05/05 14:35:58 $ */