请高手帮我看看，为什么我解密不出来，asp加密的，我用C#解密出现了点小问题 - C# 论坛

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已结贴√ 问题点数：20 回复次数：9

请高手帮我看看，为什么我解密不出来，asp加密的，我用C#解密出现了点小问题

程序代码：

Function StrDecode(byval str)
    dim base64 : set base64 = new base64_class
    LenStr=len(str)
    str=StrReverse(str)
    str=mid(str,int(LenStr/2)+1) & mid(str,1,int(LenStr/2))
    base64.bstr = "ABCDEF1234GHIJKLMnopqrs+tuvwxyz09abcdef!ghijklmNOPQRS5678TUVWXYZ"
    base64.blen = 16
    str = base64.decode(str)
    set base64 = nothing
    StrDecode = str
End function

这个是C#版

程序代码：

public static string Decode64(string str)
        {
            String Str = String.Empty;
            foreach (var item in str.Reverse())
            {
                Str += item;
            }
            Str = (Str.Substring((Str.Length / 2) + 1) + Str.Substring(1, (Str.Length / 2)));
            str = Str;
            string Base64Code = "ABCDEF1234GHIJKLMnopqrs+tuvwxyz09abcdef!ghijklmNOPQRS5678TUVWXYZ";

            int page = str.Length / 4;
            System.Collections.ArrayList outMessage = new System.Collections.ArrayList(page * 3);
            char[] message = str.ToCharArray();
            for (int i = 0; i < page; i++)
            {
                byte[] instr = new byte[4];
                instr[0] = (byte)Base64Code.IndexOf(message[i * 4]);
                instr[1] = (byte)Base64Code.IndexOf(message[i * 4 + 1]);
                instr[2] = (byte)Base64Code.IndexOf(message[i * 4 + 2]);
                instr[3] = (byte)Base64Code.IndexOf(message[i * 4 + 3]);
                byte[] outstr = new byte[3];
                outstr[0] = (byte)((instr[0] << 2) ^ ((instr[1] & 0x30) >> 4));
                if (instr[2] != 64)
                {
                    outstr[1] = (byte)((instr[1] << 4) ^ ((instr[2] & 0x3c) >> 2));
                }
                else
                {
                    outstr[2] = 0;
                }
                if (instr[3] != 64)
                {
                    outstr[2] = (byte)((instr[2] << 6) ^ instr[3]);
                }
                else
                {
                    outstr[2] = 0;
                }
                outMessage.Add(outstr[0]);
                if (outstr[1] != 0)
                    outMessage.Add(outstr[1]);
                if (outstr[2] != 0)
                    outMessage.Add(outstr[2]);
            }
            byte[] outbyte = (byte[])outMessage.ToArray(Type.GetType("System.Byte"));
            return System.Text.Encoding.Default.GetString(outbyte);
        }

[ 本帖最后由 sixserve 于 2010-11-7 08:14 编辑 ]

搜索更多相关主题的帖子: 加密　

第 2 楼

得分:10

程序代码：

        private static string Decode64(string str)
        {
            string Base64Code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
            int page = str.Length / 4;
            System.Collections.ArrayList outMessage = new System.Collections.ArrayList(page * 3);
            char[] message = str.ToCharArray();
            for (int i = 0; i < page; i++)
            {
                byte[] instr = new byte[4];
                instr[0] = (byte)Base64Code.IndexOf(message[i * 4]);
                instr[1] = (byte)Base64Code.IndexOf(message[i * 4 + 1]);
                instr[2] = (byte)Base64Code.IndexOf(message[i * 4 + 2]);
                instr[3] = (byte)Base64Code.IndexOf(message[i * 4 + 3]);
                byte[] outstr = new byte[3];
                outstr[0] = (byte)((instr[0] << 2) ^ ((instr[1] & 0x30) >> 4));
                if (instr[2] != 64)
                {
                    outstr[1] = (byte)((instr[1] << 4) ^ ((instr[2] & 0x3c) >> 2));
                }
                else
                {
                    outstr[2] = 0;
                }
                if (instr[3] != 64)
                {
                    outstr[2] = (byte)((instr[2] << 6) ^ instr[3]);
                }
                else
                {
                    outstr[2] = 0;
                }
                outMessage.Add(outstr[0]);
                if (outstr[1] != 0)
                    outMessage.Add(outstr[1]);
                if (outstr[2] != 0)
                    outMessage.Add(outstr[2]);
            }
            byte[] outbyte = (byte[])outMessage.ToArray(Type.GetType("System.Byte"));
            return System.Text.Encoding.Default.GetString(outbyte);
        }

出来混，谁不都要拼命的嘛。。拼不赢？那就看谁倒霉了。。有机会也要看谁下手快，快的就能赢，慢。。狗屎你都抢不到。。还说什么拼命？

第 3 楼

得分:0

回复 2楼 wangnannan

不对，解密不出来

第 4 楼

得分:0

回复 2楼 wangnannan

加密是这么一个过程

程序代码：

Function StrEncode(byval str)
    dim base64 : set base64 = new base64_class
    base64.bstr = "ABCDEF1234GHIJKLMnopqrs+tuvwxyz09abcdef!ghijklmNOPQRS5678TUVWXYZ"
    base64.blen = 16
    str = base64.encode(str)
    set base64 = nothing
    str=StrReverse(str)
    LenStr=len(str)
    str=mid(str,int(LenStr/2)+1) & mid(str,1,int(LenStr/2))
    StrEncode = str
End function

[ 本帖最后由 sixserve 于 2010-11-6 14:30 编辑 ]

第 5 楼

得分:0

你的意思参照你的代码写个一模一样的c# 代码是这个意思么？

出来混，谁不都要拼命的嘛。。拼不赢？那就看谁倒霉了。。有机会也要看谁下手快，快的就能赢，慢。。狗屎你都抢不到。。还说什么拼命？

第 6 楼

得分:0

回复 5楼 wangnannan

嗯，差不多，就是能解出上面代码加密的字符串，

程序代码：

public static string Decode64(string str)
        {
            String Str = String.Empty;
            foreach (var item in str.Reverse())
            {
                Str += item;
            }
            Str = (Str.Substring((Str.Length / 2) + 1) + Str.Substring(1, (Str.Length / 2)));
            str = Str;
            string Base64Code = "ABCDEF1234GHIJKLMnopqrs+tuvwxyz09abcdef!ghijklmNOPQRS5678TUVWXYZ";

            int page = str.Length / 4;
            System.Collections.ArrayList outMessage = new System.Collections.ArrayList(page * 3);
            char[] message = str.ToCharArray();
            for (int i = 0; i < page; i++)
            {
                byte[] instr = new byte[4];
                instr[0] = (byte)Base64Code.IndexOf(message[i * 4]);
                instr[1] = (byte)Base64Code.IndexOf(message[i * 4 + 1]);
                instr[2] = (byte)Base64Code.IndexOf(message[i * 4 + 2]);
                instr[3] = (byte)Base64Code.IndexOf(message[i * 4 + 3]);
                byte[] outstr = new byte[3];
                outstr[0] = (byte)((instr[0] << 2) ^ ((instr[1] & 0x30) >> 4));
                if (instr[2] != 64)
                {
                    outstr[1] = (byte)((instr[1] << 4) ^ ((instr[2] & 0x3c) >> 2));
                }
                else
                {
                    outstr[2] = 0;
                }
                if (instr[3] != 64)
                {
                    outstr[2] = (byte)((instr[2] << 6) ^ instr[3]);
                }
                else
                {
                    outstr[2] = 0;
                }
                outMessage.Add(outstr[0]);
                if (outstr[1] != 0)
                    outMessage.Add(outstr[1]);
                if (outstr[2] != 0)
                    outMessage.Add(outstr[2]);
            }
            byte[] outbyte = (byte[])outMessage.ToArray(Type.GetType("System.Byte"));
            return System.Text.Encoding.Default.GetString(outbyte);
        }