[C/C++ 演算法]-純C_BASE64和XOR加解密整合範例
本篇要分享-純C_BASE64和XOR加解密整合範例，有興趣的(C/P)同好，歡迎來(C/P)一下哈哈 ^ ^。
#include<stdio.h> #include<string.h> char BASE64CODE[64] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'}; void base64en(char *srcStr, char *desStr); void base64de(char *srcStr, char *desStr); int main(int argc, char **argv) {char src[1000] = {0}; char en[1000] = {0},de[1000]; char chrkey[100]; int intdatalen,intkeylen; int i,j; int a=0; FILE *pf; strcpy(chrkey, "jashkey"); ////////////////////////////////////////////// /* if(argc == 1) strcpy(src, "http://www.google.com"); else strcpy(src, argv[1]); pf=fopen("data.txt","w"); base64en(src, en); printf("%s => %s\n", src, en); intdatalen=strlen(en); intkeylen=strlen(chrkey); j=-1; for(i=0;i<intdatalen;i++) { if(j<intkeylen) { j++; } else { j=0; } en[i]=en[i]^chrkey[j]; fprintf(pf,"%d\n",en[i]); } fclose(pf); //*/////////////////////////////////////////////// //* pf='\0'; pf=fopen("data.txt","r"); j=0;while(fscanf(pf,"%d",&a)!=EOF) {if(a>0) {//printf("%d\n",a); en[j]=a;//printf("en=%d\n",en[j]); j++; } } fclose(pf); intdatalen=strlen(en); intkeylen=strlen(chrkey); j=-1;for(i=0;i<intdatalen;i++) {if(j<intkeylen) { j++; }else { j=0; } en[i]=en[i]^chrkey[j]; } base64de(en, de); printf("%s => %s\n", en, de);//*/ return 0; } void base64en(char *srcStr, char *desStr) {unsignedchar srcCode[3]; unsignedint i,j,len; len = strlen(srcStr)/3;for (i = 0; i < len; i++) { srcCode[0] = srcStr[i * 3 + 0]; srcCode[1] = srcStr[i * 3 + 1];srcCode[2] = srcStr[i * 3 + 2]; desStr[i * 4 + 0] = BASE64CODE[srcCode[0] >> 2]; desStr[i * 4 + 1] = BASE64CODE[((srcCode[0]&0x03)<<4) + (srcCode[1]>>4)]; desStr[i * 4 + 2] = BASE64CODE[((srcCode[1]&0x0f)<<2) + (srcCode[2]>>6)]; desStr[i * 4 + 3] = BASE64CODE[srcCode[2]&0x3f];} i = len; j = strlen(srcStr) - len * 3;if (j > 0) { srcCode[0] = srcStr[i * 3 + 0]; srcCode[1] = (j > 1) ? srcStr[i * 3 + 1] : '\0';srcCode[2] = '\0'; desStr[i * 4 + 0] = BASE64CODE[srcCode[0] >> 2]; desStr[i * 4 + 1] = BASE64CODE[((srcCode[0]&0x03)<<4) + (srcCode[1]>>4)]; desStr[i * 4 + 2] = (srcCode[1] == '\0') ? '=' : BASE64CODE[(srcCode[1]&0x0f)<<2];desStr[i * 4 + 3] = '='; i++; } desStr[i * 4] = '\0';} int base64_index(char ch) {if (ch >= 'A' && ch <= 'Z') return ch - 'A'; if (ch >= 'a' && ch <= 'z') return ch - 'a' + 26; if (ch >= '0' && ch <= '9') return ch - '0' + 52; if (ch == '+') return 62; if (ch == '/') return 63; } void base64de(char *srcStr, char *desStr) {unsignedchar srcCode[4]; unsignedint i, j, len; len = strlen(srcStr)/4 - 1;for (i = 0; i < len; i++) { srcCode[0] = base64_index(srcStr[i * 4 + 0]); srcCode[1] = base64_index(srcStr[i * 4 + 1]); srcCode[2] = base64_index(srcStr[i * 4 + 2]); srcCode[3] = base64_index(srcStr[i * 4 + 3]); desStr[i * 3 + 0] = (srcCode[0]<<2) + (srcCode[1]>>4); desStr[i * 3 + 1] = (srcCode[1]<<4) + (srcCode[2]>>2); desStr[i * 3 + 2] = ((srcCode[2]&0x03)<<6) + srcCode[3];} i = len; srcCode[0] = base64_index(srcStr[i * 4 + 0]); srcCode[1] = base64_index(srcStr[i * 4 + 1]); desStr[i * 3 + 0] = (srcCode[0]<<2) + (srcCode[1]>>4); if (srcStr[i * 4 + 2] == '=') { desStr[i * 3 + 1] = '\0'; }elseif (srcStr[i * 4 + 3] == '=') { srcCode[2] = base64_index(srcStr[i * 4 + 2]); desStr[i * 3 + 1] = (srcCode[1]<<4) + (srcCode[2]>>2); desStr[i * 3 + 2] = '\0'; }else { srcCode[2] = base64_index(srcStr[i * 4 + 2]); srcCode[3] = base64_index(srcStr[i * 4 + 3]); desStr[i * 3 + 1] = (srcCode[1]<<4) + (srcCode[2]>>2); desStr[i * 3 + 2] = ((srcCode[2]&0x03)<<6) + srcCode[3];desStr[i * 3 + 3] = '\0'; }}
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