rc4加密直接写好的可用的类

#include "RC4.h" char* Encrypt(const char* szSource, const char* szPassWord) // 加密，返回加密结果 { if(szSource == NULL || szPassWord == NULL) return NULL; unsigned char* ret = new unsigned char[strlen(szSource)]; int ret_len = 0; if(RC4((unsigned char*)szSource, strlen(szSource), (unsigned char*)szPassWord, strlen(szPassWord), ret, &ret_len) == NULL) return NULL; char* ret2 = ByteToHex(ret, ret_len); delete[] ret; return ret2; } char* Decrypt(const char* szSource, const char* szPassWord) // 解密，返回解密结果 { if(szSource == NULL || (strlen(szSource)%2 != 0) || szPassWord == NULL) return NULL; unsigned char* src = HexToByte(szSource); unsigned char* ret = new unsigned char[strlen(szSource) / 2 + 1]; int ret_len = 0; memset(ret, strlen(szSource) / 2 + 1,0); if(RC4(src, strlen(szSource) / 2, (unsigned char*)szPassWord, strlen(szPassWord), ret, &ret_len) == NULL) return NULL; ret[ret_len] = '\0'; return (char*)ret; } int RC4(const unsigned char* data, int data_len, const unsigned char* key, int key_len, unsigned char* out, int* out_len) { if (data == NULL || key == NULL || out == NULL) return NULL; unsigned char* mBox = new unsigned char[BOX_LEN]; if(GetKey(key, key_len, mBox) == NULL) return NULL; int i=0; int x=0; int y=0; for(int k = 0; k < data_len; k++) { x = (x + 1) % BOX_LEN; y = (mBox[x] + y) % BOX_LEN; swap_byte(&mBox[x], &mBox[y]); out[k] = data[k] ^ mBox[(mBox[x] + mBox[y]) % BOX_LEN]; } *out_len = data_len; delete[] mBox; return -1; } int GetKey(const unsigned char* pass, int pass_len, unsigned char* out) { if(pass == NULL || out == NULL) return NULL; int i; for(i = 0; i < BOX_LEN; i++) out[i] = i; int j = 0; for(i = 0; i < BOX_LEN; i++) { j = (pass[i % pass_len] + out[i] + j) % BOX_LEN; swap_byte(&out[i], &out[j]); } return -1; } static void swap_byte(unsigned char* a, unsigned char* b) { unsigned char swapByte; swapByte = *a; *a = *b; *b = swapByte; } // 把字节码转为十六进制码，一个字节两个十六进制，内部为字符串分配空间 char* ByteToHex(const unsigned char* vByte, const int vLen) { if(!vByte) return NULL; char* tmp = new char[vLen * 2 + 1]; // 一个字节两个十六进制码，最后要多一个'\0' int tmp2; for (int i=0;i<vLen;i++) { tmp2 = (int)(vByte[i])/16; tmp[i*2] = (char)(tmp2+((tmp2>9)?'A'-10:'0')); tmp2 = (int)(vByte[i])%16; tmp[i*2+1] = (char)(tmp2+((tmp2>9)?'A'-10:'0')); } tmp[vLen * 2] = '\0'; return tmp; } // 把十六进制字符串，转为字节码，每两个十六进制字符作为一个字节 unsigned char* HexToByte(const char* szHex) { if(!szHex) return NULL; int iLen = strlen(szHex); if (iLen<=0 || 0!=iLen%2) return NULL; unsigned char* pbBuf = new unsigned char[iLen/2]; // 数据缓冲区 int tmp1, tmp2; for (int i=0;i<iLen/2;i++) { tmp1 = (int)szHex[i*2] - (((int)szHex[i*2]>='A')?'A'-10:'0'); if(tmp1>=16) return NULL; tmp2 = (int)szHex[i*2+1] - (((int)szHex[i*2+1]>='A')?'A'-10:'0'); if(tmp2>=16) return NULL; pbBuf[i] = (tmp1*16+tmp2); } return pbBuf; }