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diff --git a/lib/http_digest.c b/lib/http_digest.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2003, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * 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://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * $Id$
+ ***************************************************************************/
+#include "setup.h"
+
+#ifndef CURL_DISABLE_HTTP
+/* -- WIN32 approved -- */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "urldata.h"
+#include "sendf.h"
+#include "strequal.h"
+
+#include "md5.h"
+#include "http_digest.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#ifdef MALLOCDEBUG
+#include "memdebug.h"
+#endif
+
+/* Test example header:
+
+WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
+
+*/
+
+CURLdigest Curl_input_digest(struct connectdata *conn,
+ char *header) /* rest of the www-authenticate:
+ header */
+{
+ bool more = TRUE;
+ struct SessionHandle *data=conn->data;
+
+ /* skip initial whitespaces */
+ while(*header && isspace((int)*header))
+ header++;
+
+ if(checkprefix("Digest", header)) {
+ header += strlen("Digest");
+
+ data->state.digest.algo = CURLDIGESTALGO_MD5; /* default algorithm */
+
+ while(more) {
+ char value[32];
+ char content[128];
+ int totlen=0;
+
+ while(*header && isspace((int)*header))
+ header++;
+
+ /* how big can these strings be? */
+ if(2 == sscanf(header, "%31[^=]=\"%127[^\"]\"",
+ value, content)) {
+ if(strequal(value, "nonce")) {
+ data->state.digest.nonce = strdup(content);
+ }
+ else if(strequal(value, "cnonce")) {
+ data->state.digest.cnonce = strdup(content);
+ }
+ else if(strequal(value, "realm")) {
+ data->state.digest.realm = strdup(content);
+ }
+ else if(strequal(value, "algorithm")) {
+ if(strequal(content, "MD5-sess"))
+ data->state.digest.algo = CURLDIGESTALGO_MD5SESS;
+ /* else, remain using the default md5 */
+ }
+ else {
+ /* unknown specifier, ignore it! */
+ }
+ totlen = strlen(value)+strlen(content)+3;
+ }
+ else
+ break; /* we're done here */
+
+ header += totlen;
+ if(',' == *header)
+ /* allow the list to be comma-separated */
+ header++;
+ }
+ }
+ else
+ /* else not a digest, get out */
+ return CURLDIGEST_NONE;
+
+ return CURLDIGEST_FINE;
+}
+
+/* convert md5 chunk to RFC2617 (section 3.1.3) -suitable ascii string*/
+static void md5_to_ascii(unsigned char *source, /* 16 bytes */
+ unsigned char *dest) /* 33 bytes */
+{
+ int i;
+ for(i=0; i<16; i++)
+ sprintf((char *)&dest[i*2], "%02x", source[i]);
+}
+
+CURLcode Curl_output_digest(struct connectdata *conn,
+ unsigned char *request,
+ unsigned char *uripath)
+{
+ /* We have a Digest setup for this, use it!
+ Now, to get all the details for this sorted out, I must urge you dear friend
+ to read up on the RFC2617 section 3.2.2, */
+ unsigned char md5buf[16]; /* 16 bytes/128 bits */
+ unsigned char ha1[33]; /* 32 digits and 1 zero byte */
+ unsigned char ha2[33];
+ unsigned char request_digest[33];
+ char *md5this;
+
+ struct SessionHandle *data = conn->data;
+
+ /*
+ if the algorithm is "MD5" or unspecified (which then defaults to MD5):
+
+ A1 = unq(username-value) ":" unq(realm-value) ":" passwd
+
+ if the algorithm is "MD5-sess" then:
+
+ A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
+ ":" unq(nonce-value) ":" unq(cnonce-value)
+ */
+ if(data->state.digest.algo == CURLDIGESTALGO_MD5SESS) {
+ md5this = aprintf("%s:%s:%s:%s:%s",
+ data->state.user,
+ data->state.digest.realm,
+ data->state.passwd,
+ data->state.digest.nonce,
+ data->state.digest.cnonce);
+ }
+ else {
+ md5this = aprintf("%s:%s:%s",
+ data->state.user,
+ data->state.digest.realm,
+ data->state.passwd);
+ }
+ Curl_md5it(md5buf, md5this);
+ free(md5this); /* free this again */
+ md5_to_ascii(md5buf, ha1);
+
+ /*
+ A2 = Method ":" digest-uri-value
+
+ (The "Method" value is the HTTP request method as specified in section
+ 5.1.1 of RFC 2616)
+ */
+
+ md5this = aprintf("%s:%s", request, uripath);
+ Curl_md5it(md5buf, md5this);
+ free(md5this); /* free this again */
+ md5_to_ascii(md5buf, ha2);
+
+ md5this = aprintf("%s:%s:%s",
+ ha1,
+ data->state.digest.nonce,
+ ha2);
+ Curl_md5it(md5buf, md5this);
+ free(md5this); /* free this again */
+ md5_to_ascii(md5buf, request_digest);
+
+ /* for test case 64 (snooped from a Mozilla 1.3a request)
+
+ Authorization: Digest username="testuser", realm="testrealm", \
+ nonce="1053604145", uri="/64", response="c55f7f30d83d774a3d2dcacf725abaca"
+ */
+
+ conn->allocptr.userpwd =
+ aprintf( "Authorization: Digest "
+ "username=\"%s\", "
+ "realm=\"%s\", "
+ "nonce=\"%s\", "
+ "uri=\"%s\", "
+ "response=\"%s\"\r\n",
+ data->state.user,
+ data->state.digest.realm,
+ data->state.digest.nonce,
+ uripath, /* this is the PATH part of the URL */
+ request_digest );
+
+ return CURLE_OK;
+}
+
+#endif