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Add Complete XOR Patch Functionality (#255)
Co-authored-by: Davide De Rosa <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| // | ||
| // XORMethodNative.h | ||
| // TunnelKit | ||
| // | ||
| // Created by Davide De Rosa on 11/4/22. | ||
| // Copyright (c) 2022 Davide De Rosa. All rights reserved. | ||
| // | ||
| // https://github.com/passepartoutvpn | ||
| // | ||
| // This file is part of TunnelKit. | ||
| // | ||
| // TunnelKit is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // TunnelKit is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with TunnelKit. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
|
|
||
| #import <Foundation/Foundation.h> | ||
|
|
||
| typedef NS_ENUM(NSInteger, XORMethodNative) { | ||
| XORMethodNativeNone, | ||
| XORMethodNativeMask, | ||
| XORMethodNativePtrPos, | ||
| XORMethodNativeReverse, | ||
| XORMethodNativeObfuscate | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| // | ||
| // XOR.h | ||
| // TunnelKit | ||
| // | ||
| // Created by Tejas Mehta on 5/24/22. | ||
| // Copyright (c) 2022 Davide De Rosa. All rights reserved. | ||
| // | ||
| // https://github.com/passepartoutvpn | ||
| // | ||
| // This file is part of TunnelKit. | ||
| // | ||
| // TunnelKit is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // TunnelKit is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with TunnelKit. If not, see <http://www.gnu.org/licenses/>. | ||
| // | ||
|
|
||
| #import <Foundation/Foundation.h> | ||
| #import "XORMethodNative.h" | ||
|
|
||
| static inline void xor_mask(uint8_t *dst, const uint8_t *src, NSData *xorMask, size_t length) | ||
| { | ||
| if (xorMask.length > 0) { | ||
| for (size_t i = 0; i < length; ++i) { | ||
| dst[i] = src[i] ^ ((uint8_t *)(xorMask.bytes))[i % xorMask.length]; | ||
| } | ||
| return; | ||
| } | ||
| memcpy(dst, src, length); | ||
| } | ||
|
|
||
| static inline void xor_ptrpos(uint8_t *dst, const uint8_t *src, size_t length) | ||
| { | ||
| for (size_t i = 0; i < length; ++i) { | ||
| dst[i] = src[i] ^ (i + 1); | ||
| } | ||
| } | ||
|
|
||
| static inline void xor_reverse(uint8_t *dst, const uint8_t *src, size_t length) | ||
| { | ||
| size_t start = 1; | ||
| size_t end = length - 1; | ||
| uint8_t temp = 0; | ||
| dst[0] = src[0]; | ||
| while (start < end) { | ||
| temp = src[start]; | ||
| dst[start] = src[end]; | ||
| dst[end] = temp; | ||
| start++; | ||
| end--; | ||
| } | ||
| if (start == end) { | ||
| dst[start] = src[start]; | ||
| } | ||
| } | ||
|
|
||
| static inline void xor_memcpy(uint8_t *dst, NSData *src, XORMethodNative method, NSData *mask, BOOL outbound) | ||
| { | ||
| const uint8_t *source = (uint8_t *)src.bytes; | ||
| switch (method) { | ||
| case XORMethodNativeNone: | ||
| memcpy(dst, source, src.length); | ||
| break; | ||
|
|
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| case XORMethodNativeMask: | ||
| xor_mask(dst, source, mask, src.length); | ||
| break; | ||
|
|
||
| case XORMethodNativePtrPos: | ||
| xor_ptrpos(dst, source, src.length); | ||
| break; | ||
|
|
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| case XORMethodNativeReverse: | ||
| xor_reverse(dst, source, src.length); | ||
| break; | ||
|
|
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| case XORMethodNativeObfuscate: | ||
| if (outbound) { | ||
| xor_ptrpos(dst, source, src.length); | ||
| xor_reverse(dst, dst, src.length); | ||
| xor_ptrpos(dst, dst, src.length); | ||
| xor_mask(dst, dst, mask, src.length); | ||
| } else { | ||
| xor_mask(dst, source, mask, src.length); | ||
| xor_ptrpos(dst, dst, src.length); | ||
| xor_reverse(dst, dst, src.length); | ||
| xor_ptrpos(dst, dst, src.length); | ||
| } | ||
| break; | ||
| } | ||
| } |
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