TEA_example_CPP.rar_TEA算法_tea_tea c_tea 加密_tea加密

/****************************** TEA加密解密算法C++实例 niqinjian 2010.4.11 ******************************/ #include <iostream> #include <stdio.h> #include <windows.h> using namespace std; #define MX (z>>5^y<<2)+(y>>3^z<<4)^(sum^y)+(k[p&3^e]^z) #define DELTA 0x9e3779b9 #define S_LOOPTIME 5 const unsigned char BASE_CODE[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; //编码，参数：要编码的字符串指针，解码后存放的位置（编码字串长度的4/3），要编码的字符串长度 ->返回结果长度 int Base64Encode(unsigned char *lpString, unsigned char *lpBuffer, int sLen) { register int vLen = 0; //寄存器局部变量，提速 while(sLen > 0) //处理整个字符串 { *lpBuffer++ = BASE_CODE[(lpString[0] >> 2 ) & 0x3F]; //右移两位，与00111111是防止溢出，自加 if(sLen > 2) //够3个字符 { *lpBuffer++ = BASE_CODE[((lpString[0] & 3) << 4) | (lpString[1] >> 4)]; *lpBuffer++ = BASE_CODE[((lpString[1] & 0xF) << 2) | (lpString[2] >> 6)]; *lpBuffer++ = BASE_CODE[lpString[2] & 0x3F]; }else { switch(sLen) //追加“= { case 1: *lpBuffer ++ = BASE_CODE[(lpString[0] & 3) << 4 ]; *lpBuffer ++ = '='; *lpBuffer ++ = '='; break; case 2: *lpBuffer ++ = BASE_CODE[((lpString[0] & 3) << 4) | (lpString[1] >> 4)]; //*lpBuffer ++ = BASE_CODE[((lpString[1] & 0x0F) << 2) | (lpString[2] >> 6)]; *lpBuffer ++ = BASE_CODE[((lpString[1] & 0x0F) << 2)]; *lpBuffer ++ = '='; break; } } lpString += 3; sLen -= 3; vLen +=4; } *lpBuffer = 0; return vLen; } //子函数 - 取密文的索引 unsigned char GetCharIndex(unsigned char c) //内联函数可以省去函数调用过程，提速 { if((c >= 'A') && (c <= 'Z')) { return c - 'A'; }else if((c >= 'a') && (c <= 'z')) { return c - 'a' + 26; }else if((c >= '0') && (c <= '9')) { return c - '0' + 52; }else if(c == '+') { return 62; }else if(c == '/') { return 63; }else if(c == '=') { return 0; } return 0; } //解码，参数：结果，密文，密文长度 int Base64Decode(unsigned char *lpString, unsigned char *lpSrc, int sLen) //解码函数 { static char lpCode[4]; register int vLen = 0; //unsigned int vLen = 0; if(sLen % 4) //Base64编码长度必定是4的倍数，包括'=' { lpString[0] = '\0'; return -1; } while(sLen > 2) //不足三个字符，忽略 { lpCode[0] = GetCharIndex(lpSrc[0]); lpCode[1] = GetCharIndex(lpSrc[1]); lpCode[2] = GetCharIndex(lpSrc[2]); lpCode[3] = GetCharIndex(lpSrc[3]); *lpString++ = (lpCode[0] << 2) | (lpCode[1] >> 4); *lpString++ = (lpCode[1] << 4) | (lpCode[2] >> 2); *lpString++ = (lpCode[2] << 6) | (lpCode[3]); lpSrc += 4; sLen -= 4; vLen += 3; } return vLen; } /* *key maybe 128bit =16 Bytes. *buf maybe BLOCK_SIZE */ void btea_encrypt( unsigned char *buf, unsigned char *key ,unsigned int sLen) { unsigned char n=sLen/4; unsigned long *v=(unsigned long *)buf; unsigned long *k=(unsigned long *)key; unsigned long z = v[n - 1],y = v[0],sum = 0,e ; unsigned char p,q; // Coding Part q = S_LOOPTIME + 52 / n ; while ( q-- > 0 ) { sum += DELTA ; e = sum >> 2 & 3 ; for ( p = 0 ; p < n - 1 ; p++ ) y = v[p + 1], z = v[p] += MX; y = v[0] ; z = v[n - 1] += MX; } } /* *key maybe 128bit =16Bytes. *buf maybe BLOCK_SIZE inbuf == outbuf == buf */ void btea_decrypt( unsigned char *buf, unsigned char *key ,unsigned int sLen) { unsigned char n=sLen/4; unsigned long *v=(unsigned long *)buf; unsigned long *k=(unsigned long *)key; unsigned long z = v[n - 1],y = v[0],sum = 0,e ; unsigned char p,q ; //Decoding Part... q = S_LOOPTIME + 52 / n ; sum = q * DELTA ; while ( sum != 0 ) { e = sum >> 2 & 3 ; for ( p = n - 1 ; p > 0 ; p-- ) z = v[p - 1], y = v[p] -= MX; z = v[n - 1] ; y = v[0] -= MX; sum -= DELTA ; } } void main() { //需要加密的数据 unsigned char abc[8]={'A','B','C','D','E','F','G','H'}; //密钥 unsigned char password[16]={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P'}; int display[100]; unsigned char i; unsigned char p=8; unsigned char str[100]; cout<<"原数据:"<<endl; //for(i=0;i<p;i++) display[i]=abc[i]; for(i=0;i<p;i++) cout<<abc[i]<<" "; cout<<endl<<endl<<endl; cout<<"tea加密后数据:"<<endl; btea_encrypt(abc,password,p); for(i=0;i<50;i++) display[i]=abc[i]; for(i=0;i<50;i++) cout<<display[i]<<" "; cout<<endl<<endl<<endl; cout<<"base64编码后数据:"<<endl; p = Base64Encode(abc, str, p); for(i=0;i<p;i++) cout<<str[i]<<" "; cout<<"base64解码后数据:"<<endl; //p = Base64Decode(abc, str, p); //for(i=0;i<p;i++) display[i]=abc[i]; //for(i=0;i<p;i++) cout<<str[i]<<" "; //cout<<"tea解密后数据:"<<endl; //btea_decrpyt(abc,password); //for(i=0;i<p;i++) display[i]=abc[i]; //for(i=0;i<p;i++) cout<<display[i]<<" "; cout<<endl<<endl<<endl; }