2 * Copyright (C) 2007-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file hash.h Inline functions for hash values. */
9 /** hash arrays are always unsigned char. */
10 #define HASH_TYPE unsigned char
13 /** We use openssl's sha1 implementation. */
14 #define hash_function sha1_hash
19 * \param h1 Pointer to the first hash value.
20 * \param h2 Pointer to the second hash value.
22 * \return 1, -1, or zero, depending on whether \a h1 is greater than,
23 * less than or equal to h2, respectively.
25 _static_inline_ int hash_compare(HASH_TYPE *h1, HASH_TYPE *h2)
29 for (i = 0; i < HASH_SIZE; i++) {
39 * Convert a hash value to ascii format.
41 * \param hash the hash value.
42 * \param asc Result pointer.
44 * \a asc must point to an area of at least 2 * \p HASH_SIZE + 1 bytes which
45 * will be filled by the function with the ascii representation of the hash
46 * value given by \a hash, and a terminating \p NULL byte.
48 _static_inline_ void hash_to_asc(HASH_TYPE *hash, char *asc)
51 const char hexchar[] = "0123456789abcdef";
53 for (i = 0; i < HASH_SIZE; i++) {
54 asc[2 * i] = hexchar[hash[i] >> 4];
55 asc[2 * i + 1] = hexchar[hash[i] & 0xf];
57 asc[2 * HASH_SIZE] = '\0';