1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * SPDX-License-Identifier: curl
23 * RFC2195 CRAM-MD5 authentication
25 ***************************************************************************/
27 #include "curl_setup.h"
29 #if !defined(CURL_DISABLE_CRYPTO_AUTH)
31 #include <curl/curl.h>
34 #include "vauth/vauth.h"
35 #include "curl_hmac.h"
38 #include "curl_printf.h"
40 /* The last #include files should be: */
41 #include "curl_memory.h"
46 * Curl_auth_create_cram_md5_message()
48 * This is used to generate a CRAM-MD5 response message ready for sending to
53 * chlg [in] - The challenge.
54 * userp [in] - The user name.
55 * passwdp [in] - The user's password.
56 * out [out] - The result storage.
58 * Returns CURLE_OK on success.
60 CURLcode Curl_auth_create_cram_md5_message(const struct bufref *chlg,
65 struct HMAC_context *ctxt;
66 unsigned char digest[MD5_DIGEST_LEN];
69 /* Compute the digest using the password as the key */
70 ctxt = Curl_HMAC_init(Curl_HMAC_MD5,
71 (const unsigned char *) passwdp,
72 curlx_uztoui(strlen(passwdp)));
74 return CURLE_OUT_OF_MEMORY;
76 /* Update the digest with the given challenge */
77 if(Curl_bufref_len(chlg))
78 Curl_HMAC_update(ctxt, Curl_bufref_ptr(chlg),
79 curlx_uztoui(Curl_bufref_len(chlg)));
81 /* Finalise the digest */
82 Curl_HMAC_final(ctxt, digest);
84 /* Generate the response */
86 "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
87 userp, digest[0], digest[1], digest[2], digest[3], digest[4],
88 digest[5], digest[6], digest[7], digest[8], digest[9], digest[10],
89 digest[11], digest[12], digest[13], digest[14], digest[15]);
91 return CURLE_OUT_OF_MEMORY;
93 Curl_bufref_set(out, response, strlen(response), curl_free);
97 #endif /* !CURL_DISABLE_CRYPTO_AUTH */