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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
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/******
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gcdkeyc.c
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GameSpy CDKey SDK Client Code
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Copyright 1999-2007 GameSpy Industries, Inc
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devsupport@gamespy.com
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******
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Please see the GameSpy CDKey SDK documentation for more
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information
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******/
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#include "../md5.h"
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#include "gcdkeyc.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#define RAWSIZE 512
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#ifdef __cplusplus
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extern "C" {
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#endif
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// method = 0 for normal auth response from game server
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// method = 1 for reauth response originating from keymaster
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void gcd_compute_response(char *cdkey, char *challenge, char response[RESPONSE_SIZE], CDResponseMethod method)
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{
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char rawout[RAWSIZE];
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unsigned int anyrandom;
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char randstr[9];
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/* check to make sure we weren't passed a huge cd key/challenge */
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if (strlen(cdkey) * 2 + strlen(challenge) + 8 >= RAWSIZE)
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{
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strcpy(response,"CD Key or challenge too long");
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return;
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}
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/* make sure we are randomized */
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srand((unsigned int)time(NULL) ^ 0x33333333);
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/* Since RAND_MAX is 16 bit on many systems, make sure we get a 32 bit number */
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anyrandom = (rand() << 16 | rand());
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sprintf(randstr,"%.8x",anyrandom);
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/* auth response = MD5(cdkey + random mod 0xffff + challenge) */
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/* reauth response = MD5(challenge + random mode 0xffff + cdkey) */
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if (method == 0)
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sprintf(rawout, "%s%d%s",cdkey, anyrandom % 0xFFFF , challenge );
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else
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sprintf(rawout, "%s%d%s",challenge, anyrandom % 0xFFFF, cdkey);
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/* do the cd key md5 */
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MD5Digest((unsigned char *)cdkey, strlen(cdkey), response);
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/* add the random value */
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strcpy(&response[32], randstr);
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/* do the response md5 */
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MD5Digest((unsigned char *)rawout, strlen(rawout), &response[40]);
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}
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#ifdef __cplusplus
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}
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#endif
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