diff options
Diffstat (limited to 'src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp')
-rw-r--r-- | src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp b/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp new file mode 100644 index 000000000..c2df0e527 --- /dev/null +++ b/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp @@ -0,0 +1,133 @@ +// Crypto/Rar20Crypto.cpp + +#include "StdAfx.h" + +#include "../../../C/7zCrc.h" +#include "../../../C/CpuArch.h" +#include "../../../C/RotateDefs.h" + +#include "Rar20Crypto.h" + +namespace NCrypto { +namespace NRar20 { + +static const int kNumRounds = 32; + +static const Byte InitSubstTable[256] = { + 215, 19,149, 35, 73,197,192,205,249, 28, 16,119, 48,221, 2, 42, + 232, 1,177,233, 14, 88,219, 25,223,195,244, 90, 87,239,153,137, + 255,199,147, 70, 92, 66,246, 13,216, 40, 62, 29,217,230, 86, 6, + 71, 24,171,196,101,113,218,123, 93, 91,163,178,202, 67, 44,235, + 107,250, 75,234, 49,167,125,211, 83,114,157,144, 32,193,143, 36, + 158,124,247,187, 89,214,141, 47,121,228, 61,130,213,194,174,251, + 97,110, 54,229,115, 57,152, 94,105,243,212, 55,209,245, 63, 11, + 164,200, 31,156, 81,176,227, 21, 76, 99,139,188,127, 17,248, 51, + 207,120,189,210, 8,226, 41, 72,183,203,135,165,166, 60, 98, 7, + 122, 38,155,170, 69,172,252,238, 39,134, 59,128,236, 27,240, 80, + 131, 3, 85,206,145, 79,154,142,159,220,201,133, 74, 64, 20,129, + 224,185,138,103,173,182, 43, 34,254, 82,198,151,231,180, 58, 10, + 118, 26,102, 12, 50,132, 22,191,136,111,162,179, 45, 4,148,108, + 161, 56, 78,126,242,222, 15,175,146, 23, 33,241,181,190, 77,225, + 0, 46,169,186, 68, 95,237, 65, 53,208,253,168, 9, 18,100, 52, + 116,184,160, 96,109, 37, 30,106,140,104,150, 5,204,117,112, 84 +}; + +void CData::UpdateKeys(const Byte *data) +{ + for (int i = 0; i < 16; i += 4) + for (int j = 0; j < 4; j++) + Keys[j] ^= g_CrcTable[data[i + j]]; +} + +static void Swap(Byte *b1, Byte *b2) +{ + Byte b = *b1; + *b1 = *b2; + *b2 = b; +} + +void CData::SetPassword(const Byte *password, UInt32 passwordLen) +{ + Keys[0] = 0xD3A3B879L; + Keys[1] = 0x3F6D12F7L; + Keys[2] = 0x7515A235L; + Keys[3] = 0xA4E7F123L; + + Byte psw[256]; + memset(psw, 0, sizeof(psw)); + memcpy(psw, password, passwordLen); + memcpy(SubstTable, InitSubstTable, sizeof(SubstTable)); + + for (UInt32 j = 0; j < 256; j++) + for (UInt32 i = 0; i < passwordLen; i += 2) + { + UInt32 n2 = (Byte)g_CrcTable[(psw[i + 1] + j) & 0xFF]; + UInt32 n1 = (Byte)g_CrcTable[(psw[i] - j) & 0xFF]; + for (UInt32 k = 1; (n1 & 0xFF) != n2; n1++, k++) + Swap(&SubstTable[n1 & 0xFF], &SubstTable[(n1 + i + k) & 0xFF]); + } + for (UInt32 i = 0; i < passwordLen; i+= 16) + EncryptBlock(&psw[i]); +} + +void CData::CryptBlock(Byte *buf, bool encrypt) +{ + Byte inBuf[16]; + UInt32 A, B, C, D, T, TA, TB; + + A = GetUi32(buf + 0) ^ Keys[0]; + B = GetUi32(buf + 4) ^ Keys[1]; + C = GetUi32(buf + 8) ^ Keys[2]; + D = GetUi32(buf + 12) ^ Keys[3]; + + if (!encrypt) + memcpy(inBuf, buf, sizeof(inBuf)); + + for (int i = 0; i < kNumRounds; i++) + { + UInt32 key = Keys[(encrypt ? i : (kNumRounds - 1 - i)) & 3]; + T = ((C + rotlFixed(D, 11)) ^ key); + TA = A ^ SubstLong(T); + T = ((D ^ rotlFixed(C, 17)) + key); + TB = B ^ SubstLong(T); + A = C; + B = D; + C = TA; + D = TB; + } + + SetUi32(buf + 0, C ^ Keys[0]); + SetUi32(buf + 4, D ^ Keys[1]); + SetUi32(buf + 8, A ^ Keys[2]); + SetUi32(buf + 12, B ^ Keys[3]); + + UpdateKeys(encrypt ? buf : inBuf); +} + +STDMETHODIMP CDecoder::CryptoSetPassword(const Byte *data, UInt32 size) +{ + _cipher.SetPassword(data, size); + return S_OK; +} + +STDMETHODIMP CDecoder::Init() +{ + return S_OK; +} + +static const UInt32 kBlockSize = 16; + +STDMETHODIMP_(UInt32) CDecoder::Filter(Byte *data, UInt32 size) +{ + if (size == 0) + return 0; + if (size < kBlockSize) + return kBlockSize; + UInt32 i; + size -= kBlockSize; + for (i = 0; i <= size; i += kBlockSize) + _cipher.DecryptBlock(data + i); + return i; +} + +}} |