自定义对1到15位长度的密码加解密

示例效果 只是对1到15位长度的密码加解密

将原明文进行ASCII码的增加转换 使其成为一个长度为16的字串 变相实现加密

解密就是根据之前的转换思路 进行相关逆运算 得到原明文

有需要的朋友 可以根据思路进行相关扩充

以使其符合自已的需要

#region 对1－15位明文加密
protected void Button1_Click(object sender, EventArgs e)
{
    string strToEncrypt = this.txt_明文.Text.Trim();
    this.txt_加密.Text = Encrypt(strToEncrypt);
}
#endregion

#region 解密
protected void Button2_Click(object sender, EventArgs e)
{
    string strToDecrypt = this.txt_加密.Text.Trim();
    this.txt_解密.Text = Decrypt(strToDecrypt);
}
#endregion

int intA = 11;
int intB = 19;

#region 加密 返回加密后的字串
private string Encrypt(string strToEncrypt)
{
    //先对原明文的长度进行相关判断 使其符合1－15这个范围       
    string strEncrypted = "";
    //利用原明文长度 将其做为加密后密码的第1位
    strEncrypted += (char)(Convert.ToString(strToEncrypt.Length, 16)[0] - intA);
    //      
    for (int i = 0; i < strToEncrypt.Length; i++)
    {
        //32-126
        int intNewChar = strToEncrypt[i] + intB;
        if (intNewChar > 126)
        {
            intNewChar = intNewChar - 127 + 32;
        }
        strEncrypted += Convert.ToChar(intNewChar).ToString();
    }

    if (strEncrypted.Length < 16)
    {
        string strEncrypted2 = "";
        string strTemp = Guid.NewGuid().ToString().Substring(0, (16 - strEncrypted.Length));
        //
        for (int j = 0; j < strTemp.Length; j++)
        {
            if (j < strEncrypted.Length)
                strEncrypted2 += strEncrypted[j].ToString();
            strEncrypted2 += strTemp[j].ToString();
        }
        if (strTemp.Length < strEncrypted.Length)
            strEncrypted2 += strEncrypted.Substring(strTemp.Length);

        strEncrypted = strEncrypted2;
    }
    //返回加密后字串
    return strEncrypted;
}
#endregion

#region 解密 返回解密后的字串
private string Decrypt(string strToDecrypt)
{       
    string strLength = Convert.ToString((char)(strToDecrypt[0] + intA));
    int intPwdLength = Convert.ToInt32(strLength, 16);
    string strDecrypted = "";
    for (int i = 1; i < strToDecrypt.Length; i++)
    {
        //32-126
        int intOldChar = strToDecrypt[i] - intB;
        if (intOldChar < 32)
        {
            intOldChar = intOldChar - 32 + 127;
        }
        strDecrypted += Convert.ToChar(intOldChar).ToString();
    }

    string strDecrypted2 = "";
    for (int j = 1; j < strDecrypted.Length; j = j + 2)
    {
        strDecrypted2 += strDecrypted[j].ToString();
    }
    //
    if (intPwdLength < 8)
    {
        strDecrypted = strDecrypted2.Substring(0, intPwdLength);
    }
    else
    {
        strDecrypted = strDecrypted2.Substring(0, 15 - intPwdLength) + strDecrypted.Substring((15 - intPwdLength) * 2);
    }
    //返回解密后字串
    return strDecrypted;
}
#endregion