很早就弄好的一份代码,发上来之前,又修改了几处(Analysis 的警告)。实际上也就是字符转换,然后使用了别人原有的Base64加解密程序。界面如下:
加解密代码放在code.cpp和code.h中,如果想用在其他地方,只要包含这个两个文件就行了。
Code.h
- #pragma once
- #define DECODE_ERROR 0xffffffff
- static char base64_chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ
- abcdefghijklmnopqrstuvwxyz0123456789+/";
-
- int CStringEncodeBase64(const CString &szInput, CString &szOutput);
- int CStringDecodeBase64(const CString &szInput, CString &szOutput);
-
- int base64_encode(const void *data, const int size, char **str);
- static int pos(const char c);
- static unsigned int token_decode(const char *token);
- int base64_decode(const char *str, char *data);
Code.cpp
- #include "stdafx.h"
- #include "Code.h"
-
- int CStringEncodeBase64(const CString &szInput, CString &szOutput)
- {
- int nRet = 0;
- int nLeng = 0;
- nLeng = (szInput.GetLength() + 1)*sizeof(TCHAR);
- char *pInput = new char[nLeng];
- ZeroMemory(pInput, nLeng);
- char *pOutput = new char[nLeng];
- ZeroMemory(pOutput, nLeng);
-
- strcpy_s(pInput, nLeng, CT2A(szInput));
- nRet = base64_encode((void *)pInput, strlen(pInput), &pOutput);
- szOutput = CA2T(pOutput);
- delete []pInput;
- delete []pOutput;
- return nRet;
- }
-
- int CStringDecodeBase64(const CString &szInput, CString &szOutput)
- {
- int nRet = 0;
- int nLeng = 0;
- nLeng = (szInput.GetLength() + 1)*sizeof(TCHAR);
- char *pInput = new char[nLeng];
- ZeroMemory(pInput, nLeng);
- char *pOutput = new char[nLeng];
- ZeroMemory(pOutput, nLeng);
-
- strcpy_s(pInput, nLeng, CT2A(szInput));
- nRet = base64_decode(pInput, pOutput);
- szOutput = CA2T(pOutput);
- delete [] pInput;
- delete [] pOutput;
- return nRet;
- }
-
- int base64_encode(const void *data, const int size, char **str)
- {
- char *s, *p;
- int i;
- int c;
- const unsigned char *q;
-
- p = s = (char *) malloc(size * 4 / 3 + 4);
- if (p == NULL)
- {
- return -1;
- }
- q = (const unsigned char *) data;
- i = 0;
- for (i = 0; i < size;)
- {
- c = q[i++];
- c *= 256;
- if (i < size)
- {
- c += q[i];
- }
- i++;
- c *= 256;
- if (i < size)
- {
- c += q[i];
- }
- i++;
- p[0] = base64_chars[(c & 0x00fc0000) >> 18];
- p[1] = base64_chars[(c & 0x0003f000) >> 12];
- p[2] = base64_chars[(c & 0x00000fc0) >> 6];
- p[3] = base64_chars[(c & 0x0000003f) >> 0];
- if (i > size)
- {
- p[3] = '=';
- }
- if (i > size + 1)
- {
- p[2] = '=';
- }
- p += 4;
- }
-
- *p = 0;
- *str = s;
- return strlen(s);
- }
-
-
- static int pos(const char c)
- {
- char *p;
- for (p = base64_chars; *p; p++)
- {
- if (*p == c)
- {
- return p – base64_chars;
- }
- }
- return -1;
- }
-
- static unsigned int token_decode(const char *token)
- {
- int i;
- unsigned int val = 0;
- int marker = 0;
- if (strlen(token) < 4)
- {
- return DECODE_ERROR;
- }
- for (i = 0; i < 4; i++)
- {
- val *= 64;
- if (token[i] == '=')
- {
- marker++;
- }
- else
- {
- if (marker > 0)
- {
- return DECODE_ERROR;
- }
- else
- {
- val += pos(token[i]);
- }
- }
- }
- if (marker > 2)
- {
- return DECODE_ERROR;
- }
- return (marker << 24) | val;
- }
-
- int base64_decode(const char *str, char *data)
- {
- const char *p;
- unsigned char *q;
-
- q = (unsigned char *)data;
- for (p = str; *p && (*p == '=' || strchr(base64_chars, *p)); p += 4)
- {
- unsigned int val = token_decode(p);
- unsigned int marker = (val >> 24) & 0xff;
- if (val == DECODE_ERROR)
- {
- return -1;
- }
- *q++ = (val >> 16) & 0xff;
- if (marker < 2)
- {
- *q++ = (val >> 8) & 0xff;
- }
- if (marker < 1)
- {
- *q++ = val & 0xff;
- }
- }
- return q – (unsigned char *) data;
- }
代码是在VS2010中开启 Code Analysis 下无警告编译通过的。
(秩名) |