371 lines
10 KiB
C++
371 lines
10 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: Aes.cpp
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Date: 2021-6-12
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Author: Reece
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***/
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#include <RuntimeInternal.hpp>
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#include "../Crypto.hpp"
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#include "Aes.hpp"
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#include <tomcrypt.h>
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#include <Crypto.hpp>
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namespace Aurora::Crypto::AES
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{
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AUKN_SYM AuUInt GetSafeCipherPadding(const Memory::MemoryViewRead ¶meters)
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{
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auto tptr = reinterpret_cast<const unsigned char *>(parameters.ptr);
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auto overhang = parameters.length & (128 - 1);
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auto primaryLength = parameters.length - overhang;
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if (overhang == 0)
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{
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auto lastbyte = tptr[primaryLength - 1];
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if (lastbyte <= 128)
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{
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return parameters.length + 128;
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}
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else
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{
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return parameters.length;
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}
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}
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else
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{
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return 128 - overhang;
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}
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}
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static bool EncryptCoolCodePadding(const void *plainText, AuUInt plainTextLength,
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const void *iv, void *outIv, AuUInt ivLength,
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const void *key, AuUInt keyLength,
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AuList<AuUInt8> &out,
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symmetric_CBC &cbc)
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{
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auto overhang = plainTextLength & (128 - 1) /* || fast_rng_bool */;
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auto padding = 128 - overhang;
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auto primaryLength = plainTextLength - overhang;
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int ret;
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auto tptr = reinterpret_cast<const unsigned char *>(plainText);
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unsigned char pad[128] =
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{
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE,
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0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00,
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE,
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0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00,
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE,
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0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00,
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE,
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0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00,
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE,
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0x00, 0x00, 0x00, 0x00, 0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x00,
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0xC0, 0x01, 0xC0, 0xDE, 0x00, 0x00, 0x00, 0x80
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};
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if (overhang == 0)
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{
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auto lastbyte = tptr[primaryLength - 1];
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if (lastbyte <= 128)
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{
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if (!AuTryResize(out, primaryLength + 128))
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{
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SysPushErrorMem();
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return false;
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}
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// encrypt plain text
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ret = cbc_encrypt(tptr, out.data(), primaryLength, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypto("{}", ret);
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return false;
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}
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// encrypt another 128 bytes of trash :( 50/50 chance
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ret = cbc_encrypt(pad, out.data() + primaryLength, 128, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypto("{}", ret);
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return false;
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}
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}
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else
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{
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if (!AuTryResize(out, primaryLength))
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{
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SysPushErrorMem();
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return false;
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}
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ret = cbc_encrypt(tptr, out.data(), primaryLength, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypto("{}", ret);
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return false;
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}
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}
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}
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else
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{
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if (!AuTryResize(out, primaryLength + 128))
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{
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SysPushErrorMem();
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return false;
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}
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ret = cbc_encrypt(tptr, out.data(), primaryLength, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypto("{}", ret);
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return false;
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}
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std::memcpy(pad, tptr + primaryLength, overhang);
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pad[127] = padding;
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ret = cbc_encrypt(pad, out.data() + primaryLength, 128, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypto("{}", ret);
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return false;
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}
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}
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return true;
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}
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AUKN_SYM bool Encrypt(const Memory::MemoryViewRead &plainText,
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const Memory::MemoryViewRead &inIv,
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const Memory::MemoryViewWrite & outIv,
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const Memory::MemoryViewRead &inKey,
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AuList<AuUInt8> &out,
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bool auCoolCodePadding)
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{
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symmetric_CBC cbc;
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if (!plainText.length)
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{
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return false;
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}
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if (!plainText.ptr)
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{
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return false;
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}
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if (!inIv.length)
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{
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return false;
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}
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if (!inIv.ptr)
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{
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return false;
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}
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if (!inKey.length)
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{
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return false;
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}
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if (!inKey.ptr)
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{
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return false;
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}
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if (inIv.length != 16)
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{
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SysPushErrorCrypt("{}", inIv.length);
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return false;
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}
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if (outIv.length)
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{
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if (inIv.length != outIv.length)
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{
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SysPushErrorCrypt("{}", outIv.length);
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return false;
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}
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}
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if ((inKey.length != 16) &&
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(inKey.length != 24) &&
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(inKey.length != 32))
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{
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SysPushErrorCrypt("{}", inKey.length);
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return false;
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}
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auto ret = cbc_start(::Crypto::gAesCipher,
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reinterpret_cast<const unsigned char *>(inIv.ptr),
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reinterpret_cast<const unsigned char *>(inKey.ptr),
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inKey.length,
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0,
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&cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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auto tptr = reinterpret_cast<const unsigned char *>(plainText.ptr);
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if (auCoolCodePadding)
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{
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if (!EncryptCoolCodePadding(tptr, plainText.length, inIv.ptr, outIv.ptr, inIv.length, inKey.ptr, inKey.length, out, cbc))
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{
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return false;
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}
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}
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else
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{
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if ((plainText.length & (16 - 1)) != 0)
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{
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SysPushErrorArg("{}", plainText.length);
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return false;
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}
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ret = cbc_encrypt(tptr, out.data(), plainText.length, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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}
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if (outIv.ptr)
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{
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unsigned long ivLength = 16;
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ret = cbc_getiv(reinterpret_cast<unsigned char *>(outIv.ptr), &ivLength, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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}
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return true;
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}
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AUKN_SYM bool Decrypt(const Memory::MemoryViewRead &cipherText,
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const Memory::MemoryViewRead &inIv,
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const Memory::MemoryViewWrite &outIv,
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const Memory::MemoryViewRead &inKey,
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AuList<AuUInt8> &plainText,
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bool safe)
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{
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symmetric_CBC cbc;
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if (!cipherText.length)
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{
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return false;
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}
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if (!cipherText.ptr)
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{
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return false;
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}
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if (!inIv.length)
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{
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return false;
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}
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if (!inIv.ptr)
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{
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return false;
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}
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if (!inKey.length)
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{
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return false;
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}
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if (!inKey.ptr)
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{
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return false;
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}
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if (inIv.length != 16)
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{
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SysPushErrorCrypt("{}", inIv.length);
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return false;
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}
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if (outIv.length)
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{
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if (inIv.length != outIv.length)
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{
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SysPushErrorCrypt("{}", outIv.length);
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return false;
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}
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}
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if ((inKey.length != 16) &&
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(inKey.length != 24) &&
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(inKey.length != 32))
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{
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SysPushErrorCrypt("{}", inKey.length);
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return false;
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}
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auto ret = cbc_start(::Crypto::gAesCipher,
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reinterpret_cast<const unsigned char *>(inIv.ptr),
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reinterpret_cast<const unsigned char *>(inKey.ptr),
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inKey.length,
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0,
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&cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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auto tptr = reinterpret_cast<const unsigned char *>(cipherText.ptr);
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if (!AuTryResize(plainText, cipherText.length))
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{
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SysPushErrorMem();
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return false;
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}
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ret = cbc_decrypt(tptr, plainText.data(), cipherText.length, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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if (safe)
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{
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auto magic = plainText[cipherText.length - 1];
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if (magic <= 128)
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{
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plainText.resize(cipherText.length - magic);
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}
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}
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if (outIv.ptr)
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{
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unsigned long ivLength = 16;
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ret = cbc_getiv(reinterpret_cast<unsigned char *>(outIv.ptr), &ivLength, &cbc);
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if (ret != CRYPT_OK)
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{
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SysPushErrorCrypt("{}", ret);
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return false;
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}
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}
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return true;
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}
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}
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