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40 lines
814 B
C
40 lines
814 B
C
#ifdef _MSC_VER
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#pragma warning(disable : 4152) /* casting func ptr to void */
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#endif
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#include <stdbool.h>
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#include <windows.h>
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#include "obfuscate.h"
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#define LOWER_HALFBYTE(x) ((x)&0xF)
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#define UPPER_HALFBYTE(x) (((x) >> 4) & 0xF)
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static void deobfuscate_str(char *str, uint64_t val)
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{
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uint8_t *dec_val = (uint8_t *)&val;
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int i = 0;
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while (*str != 0) {
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int pos = i / 2;
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bool bottom = (i % 2) == 0;
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uint8_t *ch = (uint8_t *)str;
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uint8_t xor = bottom ? LOWER_HALFBYTE(dec_val[pos])
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: UPPER_HALFBYTE(dec_val[pos]);
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*ch ^= xor;
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if (++i == sizeof(uint64_t) * 2)
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i = 0;
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str++;
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}
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}
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void *ms_get_obfuscated_func(HMODULE module, const char *str, uint64_t val)
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{
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char new_name[128];
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strcpy(new_name, str);
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deobfuscate_str(new_name, val);
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return GetProcAddress(module, new_name);
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}
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