mirror of
https://github.com/IT4Change/gradido.git
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Ulf Gebhardt
ac99a7097e
git-subtree-dir: login_server git-subtree-mainline: 09ebb40de21084bb10ee466429d900a5e757d349 git-subtree-split: ca71af1817a801db9a108c205bc298250d498c4b
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
#ifndef GRADIDO_LOGIN_SERVER_CRYPTO_OBFUS_ARRAY
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#define GRADIDO_LOGIN_SERVER_CRYPTO_OBFUS_ARRAY
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#include <stdio.h>
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#include "Poco/Types.h"
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#ifdef _ENABLE_ASSEMBLER_OBFUS //_MSC_VER
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// Quelle: https://mycomputersciencebooks.files.wordpress.com/2017/08/secure-programming-in-c-and-c.pdf
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// Kapitel 12.16
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#define NULLPAD_START __asm {
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pushl %eax
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movl %esp, %eax
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}
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#define NULLPAD __asm {
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addb %al, (%eax)
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}
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#define NULLPAD_END __asm {
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popl %eax
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}
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#define NULLPAD_10 NULLPAD_START; NULLPAD; NULLPAD; NULLPAD; NULLPAD; NULLPAD; NULLPAD_END
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#define DISASM_MISALIGN __asm __volatile ( \
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" pushl %eax \n" \
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" cmpl %eax, %eax \n" \
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" jz 0f \n" \
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" .byte 0x0F \n" \
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"0: \n" \
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" popl %eax \n")
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#define DISASM_FALSERET __asm __volatile ( \
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" pushl %ecx /* save registers */\n" \
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" pushl %ebx \n" \
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" pushl %edx \n" \
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" movl %esp, %ebx /* save ebp, esp */\n" \
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" movl %ebp, %esp \n" \
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" popl %ebp /* save old %ebp */\n" \
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" popl %ecx /* save return addr */\n" \
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" lea 0f, %edx /* edx = addr of 0: */\n" \
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" pushl %edx /* return addr = edx */\n" \
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" ret \n" \
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" .byte 0x0F /* off-by-one byte */\n" \
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"0: \n" \
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" pushl %ecx /* restore ret addr */\n" \
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" pushl %ebp /* restore old &ebp */\n" \
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" movl %esp, %ebp /* restore ebp, esp */\n" \
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" movl %ebx, %esp \n" \
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" popl %ebx \n" \
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" popl %ecx \n")
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#else
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#define NULLPAD_10
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#define DISASM_MISALIGN
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#define DISASM_FALSERET
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#endif
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class ObfusArray
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{
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public:
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ObfusArray(size_t size, const unsigned char * data);
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ObfusArray(size_t size);
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~ObfusArray();
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inline operator const unsigned char*() const {return &m_Data[m_offsetSize];}
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inline operator unsigned char*() { return &m_Data[m_offsetSize]; }
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inline size_t size() const { return m_dataSize;}
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void put(size_t i, Poco::UInt64 value);
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private:
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size_t m_arraySize;
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size_t m_offsetSize;
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size_t m_dataSize;
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unsigned char* m_Data;
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//unsigned char m_Data[64];
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};
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#endif //GRADIDO_LOGIN_SERVER_CRYPTO_OBFUS_ARRAY
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