请帮我解决这个问题。填充无效，无法删除 [英] Please help me to solve this problem. Padding is invalid and cannot be removed
本文介绍了请帮我解决这个问题。填充无效，无法删除的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
使用系统;
使用 System.Collections.Generic;
使用 System.Linq;
使用 System.Web;
使用 System.Web.UI;
使用 System.Web.UI.WebControls;
使用 System.Security.Cryptography;
使用 System.Text;
public partial class 关于：System.Web.UI.Page
{
string cipherData;
byte [] cipherByte;
byte [] textByte1;
byte [] textByte2;
byte []键;
SymmetricAlgorithm desObj;
受保护 void Page_Load（ object sender，EventArgs e）
{
desObj = Rijndael.Create（）;
}
受保护 void btnEncryption_Click（ object sender，EventArgs e）
{
cipherData = txtST.Text;
textByte1 = Encoding.ASCII.GetBytes（cipherData）;
key = Encoding.ASCII.GetBytes（ 0123456789abcdef）;
desObj.Key = key;
desObj.Mode = CipherMode.CBC;
desObj.Padding = PaddingMode.PKCS7;
System.IO.MemoryStream ms = new System.IO.MemoryStream（）;
CryptoStream cs = new CryptoStream（ms，desObj.CreateEncryptor（），CryptoStreamMode.Write）;
cs.Write（textByte1， 0 ，textByte1.Length）;
cs.Close（）;
cipherByte = ms.ToArray（）;
ms.Close（）;
txtEnc.Text = Encoding.ASCII.GetString（cipherByte）;
string data = txtEnc.Text;
会话[ encryptData] = data;
}
受保护 void btnDecryption_Click（ object <> span sender，EventArgs e）
{
byte [] takeData = Encoding.Default .GetBytes（（ string ）会话[ encryptData< /跨度>]）;
System.IO.MemoryStream ms1 = new System.IO.MemoryStream（takeData）;
CryptoStream cs1 = new CryptoStream（ms1，desObj.CreateDecryptor（），CryptoStreamMode.Read）;
cs1.Read（takeData， 0 ，takeData.Length）;
textByte2 = ms1.ToArray（）;
cs1.Close（）;
ms1.Close（）;
txtDec.Text = Encoding.ASCII.GetString（textByte2）;
}
}
解决方案
世界上有什么让你认为八位的ASCII编码位二进制数据只是有效的文本，你可以反转并从中获取原始输入？
一个简单的测试就证明它不会起作用：
byte [] inp = new byte [ 256 ];
for （ int i = 0 ; i < 256 ; i ++）
{
inp [i ] =（ byte ）i;
}
string s = Encoding.ASCII.GetString（inp）;
byte [] outp = Encoding.Default.GetBytes（s）;
if （inp.Length！= outp.Length）Console.WriteLine（ 长度不同：{0}：{1}，inp.Length，outp.Length）;
for （ int i = 0 ; i < （Math.Min（inp.Length，outp.Length））; i ++）
{
if （inp [i]！= outp [i]）Console.WriteLine（ Diff [{0}]：{1}！= {2}，i，inp [i]，outp [i]）;
}
结果：
Diff [128]：128！= 63
Diff [129]：129！= 63
Diff [130]：130！= 63
Diff [131]：131！= 63
Diff [132]：132！= 63
Diff [133]：133！= 63
Diff [134]：134！= 63
Diff [135]：135！= 63
Diff [136]：136！= 63
差异[137]：137！= 63
差异[138]：138！= 63
差异[139]：139！= 63
差异[140]：140 ！= 63
差异[141]：141！= 63
差异[142]：142！= 63
差异[143]：143！= 63
差异[144] ：144！= 63
差异[145]：145！= 63
差异[146]：146！= 63
差异[147]：147！= 63
差异[ 148]：148！= 63
差异[149]：149！= 63
差异[150]：150！= 63
差异[151]：151！= 63
Diff [152]：152！= 63
Diff [153]：153！= 63
Diff [154]：154！= 63
Diff [155]：155！= 63
Diff [156]：156！= 63
Diff [157]：157！= 63
Diff [158]：158！= 63
Diff [159]：159！= 63
Diff [160]：160！= 63
差异[161] ：161！= 63
Diff [162]：162！= 63
Diff [163]：163！= 63
Diff [164]：164！= 63
Diff [ 165]：165！= 63
差异[166]：166！= 63
差异[167]：167！= 63
差异[168]：168！= 63
Diff [169]：169！= 63
Diff [170]：170！= 63
Diff [171]：171！= 63
Diff [172]：172！= 63
Diff [173]：173！= 63
Diff [174]：174！= 63
Diff [175]：175！= 63
Diff [176]：176！= 63
差异[177]：177！= 63
差异[178]：178！= 63
差异[179]：179！= 63
差异[180]：180！ = 63
差异[181]：181！= 63
差异[182]：182！= 63
差异[183]：183！= 63
差异[184]： 184！= 63
差异[185]：185！= 63
差异[186]：186！= 63
差异[187]：187！= 63
差异[188 ]：188！= 63
差异[189]：189！= 63
差异[190]：190！= 63
差异[191]：191！= 63
差异[192]：192！= 63
差异[193]：193！= 63
差异[194]：194！= 63
差异[195]：195！= 63
Diff [196]：196！= 63
Di ff [197]：197！= 63
Diff [198]：198！= 63
Diff [199]：199！= 63
Diff [200]：200！= 63
Diff [201]：201！= 63
Diff [202]：202！= 63
Diff [203]：203！= 63
Diff [204]：204！= 63
差异[205]：205！= 63
差异[206]：206！= 63
差异[207]：207！= 63
差异[208]：208！ = 63
差异[209]：209！= 63
差异[210]：210！= 63
差异[211]：211！= 63
差异[212]： 212！= 63
Diff [213]：213！= 63
Diff [214]：214！= 63
Diff [215]：215！= 63
Diff [216 ]：216！= 63
Diff [217]：217！= 63
Diff [218]：218！= 63
Diff [219]：219！= 63
Diff [220]：220！= 63
Diff [221]：221！= 63
Diff [222]：222！= 63
Diff [223]：223！= 63
Diff [224]：224！= 63
Diff [225]：225！= 63
Diff [226]：226！= 63
Diff [227]：227！= 63
Diff [228]：228！= 63
Diff [229]：229！= 63
Diff [230]：230！= 63
Diff [231]：231！= 63
Diff [232]：232！= 63
Diff [233]：233！= 63
Diff [234]：234！= 63
Diff [235]：235！= 63
Diff [236]：236！ = 63
差异[237]：237！= 63
差异[238]：238！= 63
差异[239]：239！= 63
差异[240]： 240！= 63
Diff [241]：241！= 63
Diff [242]：242！= 63
Diff [243]：243！= 63
Diff [244 ]：244！= 63
差异[245]：245！= 63
差异[246]：246！= 63
差异[247]：247！= 63
差异[248]：248！= 63
Diff [249]：249！= 63
Diff [250]：250！= 63
Diff [251]：251！= 63
Diff [252]：252！= 63
Diff [253]：253！= 63
Diff [254]：254！= 63
Diff [255]：255！= 63
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Cryptography;
using System.Text;
public partial class About : System.Web.UI.Page
{
string cipherData;
byte[] cipherByte;
byte[] textByte1;
byte[] textByte2;
byte[] key;
SymmetricAlgorithm desObj;
protected void Page_Load(object sender, EventArgs e)
{
desObj = Rijndael.Create();
}
protected void btnEncryption_Click(object sender, EventArgs e)
{
cipherData = txtST.Text;
textByte1 = Encoding.ASCII.GetBytes(cipherData);
key = Encoding.ASCII.GetBytes("0123456789abcdef");
desObj.Key = key;
desObj.Mode = CipherMode.CBC;
desObj.Padding = PaddingMode.PKCS7;
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, desObj.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(textByte1, 0, textByte1.Length);
cs.Close();
cipherByte = ms.ToArray();
ms.Close();
txtEnc.Text = Encoding.ASCII.GetString(cipherByte);
string data = txtEnc.Text;
Session["encryptData"] = data;
}
protected void btnDecryption_Click(object sender, EventArgs e)
{
byte[] takeData = Encoding.Default.GetBytes((string)Session["encryptData"]);
System.IO.MemoryStream ms1 = new System.IO.MemoryStream(takeData);
CryptoStream cs1 = new CryptoStream(ms1, desObj.CreateDecryptor(), CryptoStreamMode.Read);
cs1.Read(takeData, 0, takeData.Length);
textByte2 = ms1.ToArray();
cs1.Close();
ms1.Close();
txtDec.Text = Encoding.ASCII.GetString(textByte2);
}
} 解决方案
What in world makes you think that the ASCII encoding of eight bit binary data will be just valid text you can reverse and get your original input from?
A simple test would have proved it wont work:
byte[] inp = new byte[256]; for (int i = 0; i < 256; i++) { inp[i] = (byte)i; } string s = Encoding.ASCII.GetString(inp); byte[] outp = Encoding.Default.GetBytes(s); if (inp.Length != outp.Length) Console.WriteLine("Different length: {0}:{1}", inp.Length, outp.Length); for (int i = 0; i < (Math.Min(inp.Length, outp.Length)); i++) { if (inp[i] != outp[i]) Console.WriteLine(" Diff [{0}] : {1} != {2}", i, inp[i], outp[i]); }
Results:
Diff [128] : 128 != 63 Diff [129] : 129 != 63 Diff [130] : 130 != 63 Diff [131] : 131 != 63 Diff [132] : 132 != 63 Diff [133] : 133 != 63 Diff [134] : 134 != 63 Diff [135] : 135 != 63 Diff [136] : 136 != 63 Diff [137] : 137 != 63 Diff [138] : 138 != 63 Diff [139] : 139 != 63 Diff [140] : 140 != 63 Diff [141] : 141 != 63 Diff [142] : 142 != 63 Diff [143] : 143 != 63 Diff [144] : 144 != 63 Diff [145] : 145 != 63 Diff [146] : 146 != 63 Diff [147] : 147 != 63 Diff [148] : 148 != 63 Diff [149] : 149 != 63 Diff [150] : 150 != 63 Diff [151] : 151 != 63 Diff [152] : 152 != 63 Diff [153] : 153 != 63 Diff [154] : 154 != 63 Diff [155] : 155 != 63 Diff [156] : 156 != 63 Diff [157] : 157 != 63 Diff [158] : 158 != 63 Diff [159] : 159 != 63 Diff [160] : 160 != 63 Diff [161] : 161 != 63 Diff [162] : 162 != 63 Diff [163] : 163 != 63 Diff [164] : 164 != 63 Diff [165] : 165 != 63 Diff [166] : 166 != 63 Diff [167] : 167 != 63 Diff [168] : 168 != 63 Diff [169] : 169 != 63 Diff [170] : 170 != 63 Diff [171] : 171 != 63 Diff [172] : 172 != 63 Diff [173] : 173 != 63 Diff [174] : 174 != 63 Diff [175] : 175 != 63 Diff [176] : 176 != 63 Diff [177] : 177 != 63 Diff [178] : 178 != 63 Diff [179] : 179 != 63 Diff [180] : 180 != 63 Diff [181] : 181 != 63 Diff [182] : 182 != 63 Diff [183] : 183 != 63 Diff [184] : 184 != 63 Diff [185] : 185 != 63 Diff [186] : 186 != 63 Diff [187] : 187 != 63 Diff [188] : 188 != 63 Diff [189] : 189 != 63 Diff [190] : 190 != 63 Diff [191] : 191 != 63 Diff [192] : 192 != 63 Diff [193] : 193 != 63 Diff [194] : 194 != 63 Diff [195] : 195 != 63 Diff [196] : 196 != 63 Diff [197] : 197 != 63 Diff [198] : 198 != 63 Diff [199] : 199 != 63 Diff [200] : 200 != 63 Diff [201] : 201 != 63 Diff [202] : 202 != 63 Diff [203] : 203 != 63 Diff [204] : 204 != 63 Diff [205] : 205 != 63 Diff [206] : 206 != 63 Diff [207] : 207 != 63 Diff [208] : 208 != 63 Diff [209] : 209 != 63 Diff [210] : 210 != 63 Diff [211] : 211 != 63 Diff [212] : 212 != 63 Diff [213] : 213 != 63 Diff [214] : 214 != 63 Diff [215] : 215 != 63 Diff [216] : 216 != 63 Diff [217] : 217 != 63 Diff [218] : 218 != 63 Diff [219] : 219 != 63 Diff [220] : 220 != 63 Diff [221] : 221 != 63 Diff [222] : 222 != 63 Diff [223] : 223 != 63 Diff [224] : 224 != 63 Diff [225] : 225 != 63 Diff [226] : 226 != 63 Diff [227] : 227 != 63 Diff [228] : 228 != 63 Diff [229] : 229 != 63 Diff [230] : 230 != 63 Diff [231] : 231 != 63 Diff [232] : 232 != 63 Diff [233] : 233 != 63 Diff [234] : 234 != 63 Diff [235] : 235 != 63 Diff [236] : 236 != 63 Diff [237] : 237 != 63 Diff [238] : 238 != 63 Diff [239] : 239 != 63 Diff [240] : 240 != 63 Diff [241] : 241 != 63 Diff [242] : 242 != 63 Diff [243] : 243 != 63 Diff [244] : 244 != 63 Diff [245] : 245 != 63 Diff [246] : 246 != 63 Diff [247] : 247 != 63 Diff [248] : 248 != 63 Diff [249] : 249 != 63 Diff [250] : 250 != 63 Diff [251] : 251 != 63 Diff [252] : 252 != 63 Diff [253] : 253 != 63 Diff [254] : 254 != 63 Diff [255] : 255 != 63
这篇关于请帮我解决这个问题。填充无效，无法删除的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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