任何人都可以在汇编时告诉我这个加密程序的解密代码

mov byte ptr [eax]，dl xor edx，ecx mov eax，edx rol al，1 ret 加密： mov eax，ecx //获取角色 inc eax //简单地添加1 t o性格！这个简单版本没有使用EKey值。 ret } // ---结束汇编代码 } // encrypt_chars函数结束 // --------------- -------------------------------------------------- ---------------------------------------------- // ------------------------------------ -------------------------------------------------- ------------------------- // --------------- - DECRYPTION ROUTINES ---------------------------------------------- --------------------------- // void decrypt_chars（int length ，char EKey） {/ ***待写*** / 返回; } // decrypt_chars函数结束 // ------------------------------------------- -------------------------------------------------- ------------------ int main（void） { int char_count; //输入的实际字符数（最大MAXCHARS限制）。 char EKey; //加密密钥。 cout<< \ n请输入您的加密密钥（EKey）信：; get_char（EKey）; cout<< \\\Now enter upto<< MAXCHARS<< 字母数字字符：\ n; get_original_chars（char_count）; cout<< \ n \ nOriginal source string =<< OChars<< \tHex =; for（int i = 0; i< char_count;> encrypt_chars（char_count，EKey）; cout<<\ n\\\Encrypted string =<<<<<<<<<" \ tHex =; for（int i = 0; i< char_count ;> decrypt_chars（char_count，EKey）; cout<<\ n\\\Decrypted string =<<< DChars<< \tHex =; for（int i = 0; i< char_count;> cout<<\ n \ n按一个键结束......; while（！_kbhit（））; //按住屏幕直到按下一个键 return（0）; } //整个加密/解密程序结束-------------------- ------------------------------------------------ 我在你重新发布这个问题时回答了这个问题。 Hi , I have got this encryption decryption program , the following program compiles and works alright .However I cannot figure out what to write for the decryption section.Can anybody please tell me the code for writing the corresponding decrypt_chars() routine?Thank you---------------------------------------// The encryption program in C++ and ASM with a very simple encryption method - it simply adds 1 to the character.#include <conio.h>// for kbhit#include <iostream>// for cin >> and cout <<#include <iomanip>// for fancy outputusing namespace std;#define MAXCHARS 6// feel free to alter this, but 6 is the minimum#define dollarchar '$' // string terminatorchar OChars[MAXCHARS], EChars[MAXCHARS], DChars[MAXCHARS] = "Soon!";// Global Original, Encrypted, Decrypted character strings//----------------------------- C++ Functions ----------------------------------------------------------void get_char(char& a_character){cin >> a_character;while (((a_character < '0') | (a_character > 'z')) && (a_character != dollarchar)){cout << "Alphanumeric characters only, please try again > ";cin >> a_character;}}//-------------------------------------------------------------------------------------------------------------void get_original_chars(int& length){char next_char;length = 0;get_char(next_char);while ((length < MAXCHARS) && (next_char != dollarchar)){OChars[length++] = next_char;get_char(next_char);}}//---------------------------------------------------------------------------------------------------------------//----------------- ENCRYPTION ROUTINES -------------------------------------------------------------------------void encrypt_chars(int length, char EKey){char temp_char;// char temporary storefor (int i = 0; i < length; i++)// encrypt characters one at a time{temp_char = OChars[i];// __asm {// push eax// save register values on stack to be safepush ecx//movzx ecx, temp_char// lea eax, EKey// call encrypt// encrypt the charactermov temp_char, al// pop ecx// restore original register values from stackpop eax//}EChars[i] = temp_char;// Store encrypted char in the encrypted chars array}return;// --- Start of Assembly code__asm {// Inputs: register EAX = 32-bit address of Ekey, //ECX = the character to be encrypted (in the low 8-bit field, CL).// Output: register EAX = the encrypted value of the source character (in the low 8-bit field, AL).encrypt5: push eaxmov al, byte ptr[eax]push ecxand eax, 0x7Cror eax, 1ror eax, 1inc eaxmov edx, eaxpop ecxpop eaxmov byte ptr[eax], dlxor edx, ecxmov eax, edxrol al, 1retencrypt : mov eax, ecx// get character inc eax// simply add 1 to character! EKey value not used in this simple version. ret}//--- End of Assembly code}// end of encrypt_chars function//---------------------------------------------------------------------------------------------------------------//---------------------------------------------------------------------------------------------------------------//----------------- DECRYPTION ROUTINES -------------------------------------------------------------------------// void decrypt_chars(int length, char EKey){ /*** to be written ***/return;}// end of decrypt_chars function//---------------------------------------------------------------------------------------------------------------int main(void){int char_count;// The number of actual characters entered (upto MAXCHARS limit).char EKey;// Encryption key.cout << "\nPlease enter your Encryption Key (EKey) letter: "; get_char(EKey);cout << "\nNow enter upto " << MAXCHARS << " alphanumeric characters:\n";get_original_chars(char_count);cout << "\n\nOriginal source string = " << OChars << "\tHex = ";for (int i = 0; i<char_count;>encrypt_chars(char_count, EKey);cout << "\n\nEncrypted string = " << EChars << "\tHex = ";for (int i = 0; i<char_count;>decrypt_chars(char_count, EKey);cout << "\n\nDecrypted string = " << DChars << "\tHex = ";for (int i = 0; i<char_count;>cout << "\n\nPress a key to end...";while (!_kbhit());//hold the screen until a key is pressedreturn (0);} // end of whole encryption/decryption program -------------------------------------------------------------------- 解决方案 ' // string terminatorchar OChars[MAXCHARS], EChars[MAXCHARS], DChars[MAXCHARS] = "Soon!";// Global Original, Encrypted, Decrypted character strings//----------------------------- C++ Functions ----------------------------------------------------------void get_char(char& a_character){cin >> a_character;while (((a_character < '0') | (a_character > 'z')) && (a_character != dollarchar)){cout << "Alphanumeric characters only, please try again > ";cin >> a_character;}}//-------------------------------------------------------------------------------------------------------------void get_original_chars(int& length){char next_char;length = 0;get_char(next_char);while ((length < MAXCHARS) && (next_char != dollarchar)){OChars[length++] = next_char;get_char(next_char);}}//---------------------------------------------------------------------------------------------------------------//----------------- ENCRYPTION ROUTINES -------------------------------------------------------------------------void encrypt_chars(int length, char EKey){char temp_char;// char temporary storefor (int i = 0; i < length; i++)// encrypt characters one at a time{temp_char = OChars[i];// __asm {// push eax// save register values on stack to be safepush ecx//movzx ecx, temp_char// lea eax, EKey// call encrypt// encrypt the charactermov temp_char, al// pop ecx// restore original register values from stackpop eax//}EChars[i] = temp_char;// Store encrypted char in the encrypted chars array}return;// --- Start of Assembly code__asm {// Inputs: register EAX = 32-bit address of Ekey, //ECX = the character to be encrypted (in the low 8-bit field, CL).// Output: register EAX = the encrypted value of the source character (in the low 8-bit field, AL).encrypt5: push eaxmov al, byte ptr[eax]push ecxand eax, 0x7Cror eax, 1ror eax, 1inc eaxmov edx, eaxpop ecxpop eaxmov byte ptr[eax], dlxor edx, ecxmov eax, edxrol al, 1retencrypt : mov eax, ecx// get character inc eax// simply add 1 to character! EKey value not used in this simple version. ret}//--- End of Assembly code}// end of encrypt_chars function//---------------------------------------------------------------------------------------------------------------//---------------------------------------------------------------------------------------------------------------//----------------- DECRYPTION ROUTINES -------------------------------------------------------------------------// void decrypt_chars(int length, char EKey){ /*** to be written ***/return;}// end of decrypt_chars function//---------------------------------------------------------------------------------------------------------------int main(void){int char_count;// The number of actual characters entered (upto MAXCHARS limit).char EKey;// Encryption key.cout << "\nPlease enter your Encryption Key (EKey) letter: "; get_char(EKey);cout << "\nNow enter upto " << MAXCHARS << " alphanumeric characters:\n";get_original_chars(char_count);cout << "\n\nOriginal source string = " << OChars << "\tHex = ";for (int i = 0; i<char_count;>encrypt_chars(char_count, EKey);cout << "\n\nEncrypted string = " << EChars << "\tHex = ";for (int i = 0; i<char_count;>decrypt_chars(char_count, EKey);cout << "\n\nDecrypted string = " << DChars << "\tHex = ";for (int i = 0; i<char_count;>cout << "\n\nPress a key to end...";while (!_kbhit());//hold the screen until a key is pressedreturn (0);} // end of whole encryption/decryption program --------------------------------------------------------------------I answered this in your repost of this question. 这篇关于任何人都可以在汇编时告诉我这个加密程序的解密代码的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！