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85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
/******
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GameSpy / GameMaster Utility Code
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Copyright 1998 Critical Mass Communications, LLC.
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Suite E-204
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2900 Bristol Street
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Costa Mesa, CA 92626
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(714)549-7689
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Fax(714)549-0757
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see gsutils.h for documentation
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******/
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typedef unsigned char uchar;
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static void swap_byte(uchar* a, uchar* b)
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{
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uchar swapByte;
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swapByte = *a;
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*a = *b;
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*b = swapByte;
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}
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static uchar encode_ct(uchar c)
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{
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if (c < 26) return (uchar)('A' + c);
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if (c < 52) return (uchar)('a' + c - 26);
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if (c < 62) return (uchar)('0' + c - 52);
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if (c == 62) return (uchar)('+');
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if (c == 63) return (uchar)('/');
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return 0;
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}
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void gs_encode(uchar* ins, int size, uchar* result)
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{
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int i, pos;
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uchar trip[3];
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uchar kwart[4];
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i = 0;
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while (i < size)
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{
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for (pos = 0; pos <= 2; pos++, i++)
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if (i < size) trip[pos] = *ins++;
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else trip[pos] = '\0';
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kwart[0] = (unsigned char)((trip[0]) >> 2);
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kwart[1] = (unsigned char)((((trip[0]) & 3) << 4) + ((trip[1]) >> 4));
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kwart[2] = (unsigned char)((((trip[1]) & 15) << 2) + ((trip[2]) >> 6));
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kwart[3] = (unsigned char)((trip[2]) & 63);
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for (pos = 0; pos <= 3; pos++) *result++ = encode_ct(kwart[pos]);
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}
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*result = '\0';
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}
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void gs_encrypt(uchar* key, int key_len, uchar* buffer_ptr, int buffer_len)
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{
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int counter;
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uchar x, y, xorIndex;
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uchar state[256];
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for (counter = 0; counter < 256; counter++) state[counter] = (uchar)counter;
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x = 0; y = 0;
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for (counter = 0; counter < 256; counter++)
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{
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y = (uchar)((key[x] + state[counter] + y) % 256);
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x = (uchar)((x + 1) % key_len);
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swap_byte(&state[counter], &state[y]);
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}
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x = 0; y = 0;
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for (counter = 0; counter < buffer_len; counter++)
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{
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x = (uchar)((x + buffer_ptr[counter] + 1) % 256);
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y = (uchar)((state[x] + y) % 256);
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swap_byte(&state[x], &state[y]);
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xorIndex = (uchar)((state[x] + state[y]) % 256);
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buffer_ptr[counter] ^= state[xorIndex];
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}
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}
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