26 lines
751 B
C
26 lines
751 B
C
#include "decrypt.h"
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#include "utils/decryptUtilities.h"
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struct DECRYPTION_DATA {
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uint32_t key0;
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uint32_t key1;
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uint32_t key2;
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};
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struct DECRYPTION_DATA decryptor;
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void initDecryptor(uint32_t key0, uint32_t key1, uint32_t key2) {
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decryptor.key0 = key0;
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decryptor.key1 = key1;
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decryptor.key2 = key2;
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}
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/** Decrypts the given input in-place. The input buffer will be modified. */
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void decrypt(uint8_t* chunk, unsigned long length) {
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for (unsigned long i = 0; i < length; i += 1) {
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uint8_t curChar = chunk[i];
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curChar = curChar ^ decryptByte((uint16_t)((uint16_t)(decryptor.key2 & (uint16_t)0xFFFF) | (uint16_t)2));
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updateKeys(&(decryptor.key0), &(decryptor.key1), &(decryptor.key2), curChar);
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chunk[i] = curChar;
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}
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}
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