174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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* RFC2104 Keyed-Hashing for Message Authentication
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*
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***************************************************************************/
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#include "curl_setup.h"
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#if (defined(USE_CURL_NTLM_CORE) && !defined(USE_WINDOWS_SSPI)) \
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|| !defined(CURL_DISABLE_AWS) || !defined(CURL_DISABLE_DIGEST_AUTH)
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#include <curl/curl.h>
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#include "curl_hmac.h"
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#include "curl_memory.h"
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#include "warnless.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* Generic HMAC algorithm.
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*
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* This module computes HMAC digests based on any hash function. Parameters
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* and computing procedures are set-up dynamically at HMAC computation context
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* initialization.
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*/
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static const unsigned char hmac_ipad = 0x36;
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static const unsigned char hmac_opad = 0x5C;
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struct HMAC_context *
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Curl_HMAC_init(const struct HMAC_params *hashparams,
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const unsigned char *key,
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unsigned int keylen)
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{
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size_t i;
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struct HMAC_context *ctxt;
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unsigned char *hkey;
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unsigned char b;
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/* Create HMAC context. */
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i = sizeof(*ctxt) + 2 * hashparams->hmac_ctxtsize +
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hashparams->hmac_resultlen;
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ctxt = malloc(i);
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if(!ctxt)
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return ctxt;
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ctxt->hmac_hash = hashparams;
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ctxt->hmac_hashctxt1 = (void *) (ctxt + 1);
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ctxt->hmac_hashctxt2 = (void *) ((char *) ctxt->hmac_hashctxt1 +
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hashparams->hmac_ctxtsize);
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/* If the key is too long, replace it by its hash digest. */
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if(keylen > hashparams->hmac_maxkeylen) {
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(*hashparams->hmac_hinit)(ctxt->hmac_hashctxt1);
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, key, keylen);
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hkey = (unsigned char *) ctxt->hmac_hashctxt2 + hashparams->hmac_ctxtsize;
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(*hashparams->hmac_hfinal)(hkey, ctxt->hmac_hashctxt1);
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key = hkey;
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keylen = hashparams->hmac_resultlen;
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}
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/* Prime the two hash contexts with the modified key. */
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(*hashparams->hmac_hinit)(ctxt->hmac_hashctxt1);
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(*hashparams->hmac_hinit)(ctxt->hmac_hashctxt2);
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for(i = 0; i < keylen; i++) {
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b = (unsigned char)(*key ^ hmac_ipad);
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, &b, 1);
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b = (unsigned char)(*key++ ^ hmac_opad);
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2, &b, 1);
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}
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for(; i < hashparams->hmac_maxkeylen; i++) {
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt1, &hmac_ipad, 1);
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2, &hmac_opad, 1);
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}
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/* Done, return pointer to HMAC context. */
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return ctxt;
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}
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int Curl_HMAC_update(struct HMAC_context *ctxt,
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const unsigned char *data,
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unsigned int len)
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{
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/* Update first hash calculation. */
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(*ctxt->hmac_hash->hmac_hupdate)(ctxt->hmac_hashctxt1, data, len);
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return 0;
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}
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int Curl_HMAC_final(struct HMAC_context *ctxt, unsigned char *result)
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{
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const struct HMAC_params *hashparams = ctxt->hmac_hash;
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/* Do not get result if called with a null parameter: only release
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storage. */
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if(!result)
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result = (unsigned char *) ctxt->hmac_hashctxt2 +
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ctxt->hmac_hash->hmac_ctxtsize;
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(*hashparams->hmac_hfinal)(result, ctxt->hmac_hashctxt1);
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(*hashparams->hmac_hupdate)(ctxt->hmac_hashctxt2,
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result, hashparams->hmac_resultlen);
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(*hashparams->hmac_hfinal)(result, ctxt->hmac_hashctxt2);
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free((char *) ctxt);
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return 0;
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}
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/*
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* Curl_hmacit()
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*
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* This is used to generate a HMAC hash, for the specified input data, given
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* the specified hash function and key.
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*
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* Parameters:
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*
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* hashparams [in] - The hash function (Curl_HMAC_MD5).
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* key [in] - The key to use.
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* keylen [in] - The length of the key.
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* data [in] - The data to encrypt.
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* datalen [in] - The length of the data.
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* output [in/out] - The output buffer.
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*
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* Returns CURLE_OK on success.
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*/
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CURLcode Curl_hmacit(const struct HMAC_params *hashparams,
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const unsigned char *key, const size_t keylen,
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const unsigned char *data, const size_t datalen,
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unsigned char *output)
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{
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struct HMAC_context *ctxt =
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Curl_HMAC_init(hashparams, key, curlx_uztoui(keylen));
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if(!ctxt)
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return CURLE_OUT_OF_MEMORY;
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/* Update the digest with the given challenge */
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Curl_HMAC_update(ctxt, data, curlx_uztoui(datalen));
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/* Finalise the digest */
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Curl_HMAC_final(ctxt, output);
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return CURLE_OK;
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}
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#endif /* Using NTLM (without SSPI) or AWS */
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