/* * md5.c: checksum routines * * ==================================================================== * Copyright (c) 2000-2004 CollabNet. All rights reserved. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://subversion.tigris.org/license-1.html. * If newer versions of this license are posted there, you may use a * newer version instead, at your option. * * This software consists of voluntary contributions made by many * individuals. For exact contribution history, see the revision * history and logs, available at http://subversion.tigris.org/. * ==================================================================== */ #include "svn_md5.h" /* The MD5 digest for the empty string. */ static const unsigned char svn_md5__empty_string_digest[] = { 212, 29, 140, 217, 143, 0, 178, 4, 233, 128, 9, 152, 236, 248, 66, 126 }; const unsigned char * svn_md5_empty_string_digest(void) { return svn_md5__empty_string_digest; } const char * svn_md5_digest_to_cstring_display(const unsigned char digest[], apr_pool_t *pool) { static const char *hex = "0123456789abcdef"; char *str = apr_palloc(pool, (APR_MD5_DIGESTSIZE * 2) + 1); int i; for (i = 0; i < APR_MD5_DIGESTSIZE; i++) { str[i*2] = hex[digest[i] >> 4]; str[i*2+1] = hex[digest[i] & 0x0f]; } str[i*2] = '\0'; return str; } const char * svn_md5_digest_to_cstring(const unsigned char digest[], apr_pool_t *pool) { static const unsigned char zeros_digest[APR_MD5_DIGESTSIZE] = { 0 }; if (memcmp(digest, zeros_digest, APR_MD5_DIGESTSIZE) != 0) return svn_md5_digest_to_cstring_display(digest, pool); else return NULL; } svn_boolean_t svn_md5_digests_match(const unsigned char d1[], const unsigned char d2[]) { static const unsigned char zeros[APR_MD5_DIGESTSIZE] = { 0 }; return ((memcmp(d1, zeros, APR_MD5_DIGESTSIZE) == 0) || (memcmp(d2, zeros, APR_MD5_DIGESTSIZE) == 0) || (memcmp(d1, d2, APR_MD5_DIGESTSIZE) == 0)); }