d77e77bb82
Batch #16304 by Yommy: 0 byte-identical, 1 confirmed by peer review. - fn_18121 myGPack::DecryptPakData: logic confirmed by peer review Peer-reviewed-by: youko, bgamez23 Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
#include "Archive/PakCrypto.h"
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#include <cstring>
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#include <wincrypt.h>
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namespace myGPack {
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// OFFSET: 0x00AEA5C0
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// FUNCTION: fn_18121
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int DecryptPakData(const BYTE* secret, DWORD secretSize, const BYTE* input, BYTE* output, DWORD dataSize) {
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HCRYPTPROV provider = 0;
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HCRYPTKEY key = 0;
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HCRYPTHASH hash = 0;
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DWORD length = dataSize;
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DWORD result = 0;
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std::memcpy(output, input, length);
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try {
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if (!CryptAcquireContextA(&provider, nullptr, nullptr, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
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throw GetLastError();
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}
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if (!CryptCreateHash(provider, CALG_MD5, 0, 0, &hash)) {
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throw GetLastError();
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}
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if (!CryptHashData(hash, secret, secretSize, 0)) {
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throw GetLastError();
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}
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if (!CryptDeriveKey(provider, CALG_RC4, hash, CRYPT_EXPORTABLE, &key)) {
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throw GetLastError();
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}
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if (!CryptDecrypt(key, 0, TRUE, 0, output, &length)) {
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throw GetLastError();
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}
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} catch (DWORD error) {
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result = error;
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}
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if (key != 0) {
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CryptDestroyKey(key);
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}
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if (hash != 0) {
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CryptDestroyHash(hash);
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}
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if (provider != 0) {
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CryptReleaseContext(provider, 0);
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}
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return result;
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}
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}
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