帮忙解一个base64加密
上面就是加密的 帮下忙解密一下
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最新回答
晴空如洗
2023-07-09 07:08:30
char *b64index = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
bool Base64Decode(char *code, char *txt)
{
int len = strlen(code);
if(len % 4) return false;
char *buf = new char[len];
int i,j;
bool p = false;
for(i = 0; i < len; i++)
{
p = false;
for(j = 0; j < 64; j++)
{
if(code[i] == b64index[j] || code[i] == '=')
{
buf[i] = j;
p = true;
break;
}
}
if(!p)
return false; //出现非法字符
}
if(code[len - 1] == '=') buf[len - 1] = 0;
if(code[len - 2] == '=') buf[len - 2] = 0;
for(i = 0; i < len / 4; i++)
{
txt[i * 3] = buf[i * 4] << 2 & 0xFC | ( buf[i * 4 + 1] >> 4 & 0x03);
txt[i * 3 + 1] = buf[i * 4 + 1] << 4 & 0xF0 | ( buf[i * 4 + 2] >> 2 & 0x0F);
txt[i * 3 + 2] = buf[i * 4 + 2] << 6 & 0xC0 | buf[i * 4 + 3];
}
txt[len * 6 / 8] = '\0';
delete buf;
return true;
}
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2021-01-26 01:30:44
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