69 lines
1.1 KiB
C++
69 lines
1.1 KiB
C++
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// CmdLineAuth.cpp : Defines the entry point for the console application.
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//
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#define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers
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#define _CRT_SECURE_NO_DEPRECATE
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#define _USE_32BIT_TIME_T
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#include <stdio.h>
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#include <time.h>
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#include <stdio.h>
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#include "MD5.c"
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int LastNow;
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int PassCode;
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VOID CreateOneTimePassword(char * KeyPhrase)
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{
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// Create a time dependent One Time Password from the KeyPhrase
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time_t NOW = time(NULL);
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unsigned char Hash[16];
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char Password[20];
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char Key[1000];
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int i, chr;
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long long Val;
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NOW = NOW/30; // Only Change every 30 secs
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if (NOW == LastNow)
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return;
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LastNow = NOW;
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sprintf(Key, "%s%x", KeyPhrase, NOW);
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md5(Key, Hash);
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for (i=0; i<16; i++)
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{
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chr = (Hash[i] & 31);
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if (chr > 9) chr += 7;
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Password[i] = chr + 48;
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}
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Password[16] = 0;
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memcpy(&Val, Password, 8);
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PassCode = Val %= 1000000;
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printf("Passcode is %d\n", PassCode);
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return;
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}
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int main(int argc, char * argv[])
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{
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if (argc < 2)
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{
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printf ("Need to supply KeyPhrase\n");
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return 0;
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}
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CreateOneTimePassword(argv[1]);
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return 0;
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}
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