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我正在尝试用 PHP 和 VB.NET 编写一个使用 Triple DES 的函数在两个方向传递加密数据。问题是，当我尝试使用 PHP 解密在 VB.NET 中加密的字符串时，我收到一条错误消息，指出 IV 的 block 大小必须匹配。
我在 VB.NET 中编写的类如下所示，功能齐全，因为它可以完美地加密和解密自己的 block 。
Imports System
Imports System.Text
Imports System.IO
Imports System.Security.Cryptography
Public Class Cipher
Dim method As TripleDESCryptoServiceProvider
Dim key As Byte()
Public Property Password() As String
Get
Return System.Text.Encoding.Unicode.GetString(Key)
End Get
Set(value As String)
key = System.Text.Encoding.Unicode.GetBytes(value)
End Set
End Property
Public Function Encrypt(data As String) As String
Dim ms As New System.IO.MemoryStream
' Create the encoder to write to the stream.
Dim dataBytes() As Byte = System.Text.Encoding.Unicode.GetBytes(data)
Dim encStream As New CryptoStream(ms, method.CreateEncryptor(), System.Security.Cryptography.CryptoStreamMode.Write)
' Use the crypto stream to write the byte array to the stream.
encStream.Write(dataBytes, 0, dataBytes.Length)
encStream.FlushFinalBlock()
' IV and Ciphered string are each Base64'd and seperated by a comma, then the whole result is Base64'd
Return Convert.ToBase64String(System.Text.Encoding.Unicode.GetBytes(Convert.ToBase64String(method.IV) & "," & Convert.ToBase64String(ms.ToArray)))
End Function
Public Function Decrypt(data As String) As String
' Convert the encrypted text string to a byte array.
Dim partDecoded As String = System.Text.Encoding.Unicode.GetString(Convert.FromBase64String(data))
Dim dataBytes() As Byte
If InStr(partDecoded, ",") > 0 Then
Dim parts() As String = Split(partDecoded, ",")
' Get IV from first part
method.IV = Convert.FromBase64String(parts(0))
' Get ciphered data from second part
dataBytes = Convert.FromBase64String(parts(1))
' Create the stream.
Dim ms As New System.IO.MemoryStream
' Create the decoder to write to the stream.
Dim decStream As New CryptoStream(ms, method.CreateDecryptor(), System.Security.Cryptography.CryptoStreamMode.Write)
' Use the crypto stream to write the byte array to the stream.
decStream.Write(dataBytes, 0, dataBytes.Length)
decStream.FlushFinalBlock()
' Convert the plaintext stream to a string.
Return System.Text.Encoding.Unicode.GetString(ms.ToArray)
Else
Return False
End If
End Function
Public Sub New()
method = New TripleDESCryptoServiceProvider
method.Mode = CipherMode.CFB
method.GenerateIV()
End Sub
End Class
上述类的用法示例
Dim c As New Cipher
c.Password = "12345"
Dim encrypted As String = c.Encrypt("hello")
Debug.Print(encrypted)
Dim decrypted As String = c.Decrypt(encrypted)
Debug.Print(decrypted)
现在我还有以下 PHP 代码，它也可以(单独使用)
class Cipher {
private $iv;
private $securekey;
function __construct($key) {
$this->securekey = $key;
}
function encrypt($string) {
$this->iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_3DES, MCRYPT_MODE_CFB),MCRYPT_DEV_RANDOM);
$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_3DES, $this->securekey, $string, MCRYPT_MODE_CFB, $this->iv));
return base64_encode(base64_encode($this->iv) . ',' . $encrypted);
}
function decrypt($string) {
$decrypt = base64_decode($string);
if(strpos($decrypt,',') > 0) {
$decrypt = explode(',', $decrypt);
$this->iv = base64_decode($decrypt[0]);
return trim(mcrypt_decrypt(MCRYPT_3DES, $this->securekey, base64_decode($decrypt[1]), MCRYPT_MODE_CFB, $this->iv));
} else {
return false;
}
}
}
PHP 示例用法
$c = new Cipher("12345");
$encrypted = $c->encrypt("hello");
echo 'Encrypted: ' . $encrypted . '<br />';
$decrypted = $c->decrypt($encrypted);
echo 'Decrypted: ' . $decrypted . '<br />';
$vb = "MwBOAEoAOQBjAEgAcQAyAC8ASABzAD0ALABmAEUAOQBaAHYAVwBzAFUAYQB3AFYARwBGAHUANABLAGUAVgB3AFcAaABRAD0APQA=";
echo 'VB.NET Dec: ' . $c->decrypt($vb);
我在上面的 PHP 用法中包含的是 Base64用 VB.NET 制作的字符串在 VB.NET 中完美解码为变量 $vb。
这让我非常抓狂，因为代码是正确的，而且功能正常——在这两种情况下——所以我错过了什么，你能指出/解决问题吗？我不想使用 Rijndael ，或探索其他密码方法，因为这个方法已经成熟，可以在本地跨多个设备(iOS、Android、Windows、Linux 等)工作。
最佳答案
由于没有人能够提供功能齐全的双向解决方案，因此我冒昧地在本文中为社区提供了一个解决方案。
问题是 PHP 不符合标准，因为它强制填充字符串以进行匹配。目前，如果在 .NET 和 PHP 之间随机生成 IV，还没有可靠的方法来传递 IV(如果您确实发现了方法，或者这发生了变化，请随时修改)。
以下是使用 Triple DES 以与 .NET 和 PHP 兼容的方式加密数据的完整解决方案，允许双向 Triple DES 加密通信。此方法还与 Java、Delphi、Objective-C 和许多其他语言兼容，但是此处不会提供此类代码，因为这不是已发布问题的解决方案。
Imports System
Imports System.Text
Imports System.IO
Imports System.Security.Cryptography
Public Class TripleDES
Private bPassword As Byte()
Private sPassword As String
Public Sub New(Optional ByVal Password As String = "password")
' On Class Begin
Me.Password = Password
End Sub
Public ReadOnly Property PasswordHash As String
Get
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Return UTF8.GetString(bPassword)
End Get
End Property
Public Property Password() As String
Get
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Return sPassword
End Get
Set(value As String)
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Dim HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
bPassword = HashProvider.ComputeHash(UTF8.GetBytes(value))
sPassword = value
End Set
End Property
#Region "Encrypt"
' Encrypt using Password from Property Set (pre-hashed)
Public Function Encrypt(ByVal Message As String) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = bPassword
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
Dim DataToEncrypt() As Byte = UTF8.GetBytes(Message)
Try
Dim Encryptor As ICryptoTransform = TDESAlgorithm.CreateEncryptor
Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length)
Finally
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
Return Convert.ToBase64String(Results)
End Function
' Encrypt using Password as byte array
Private Function Encrypt(ByVal Message As String, ByVal Password() As Byte) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = HashProvider.ComputeHash(UTF8.GetBytes(UTF8.GetString(Password)))
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
Dim DataToEncrypt() As Byte = UTF8.GetBytes(Message)
Try
Dim Encryptor As ICryptoTransform = TDESAlgorithm.CreateEncryptor
Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length)
Finally
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
Return Convert.ToBase64String(Results)
End Function
' Encrypt using Password as string
Public Function Encrypt(ByVal Message As String, ByVal Password As String) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
' Step 1. We hash the Passphrase using MD5
' We use the MD5 hash generator as the result is a 128 bit byte array
' which is a valid length for the Triple DES encoder we use below
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = HashProvider.ComputeHash(UTF8.GetBytes(Password))
' Step 2. Create a new TripleDESCryptoServiceProvider object
' Step 3. Setup the encoder
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
' Step 4. Convert the input string to a byte[]
Dim DataToEncrypt() As Byte = UTF8.GetBytes(Message)
' Step 5. Attempt to encrypt the string
Try
Dim Encryptor As ICryptoTransform = TDESAlgorithm.CreateEncryptor
Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length)
Finally
' Clear the Triple Des and Hashprovider services of any sensitive information
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
' Step 6. Return the encrypted string as a base64 encoded string
Return Convert.ToBase64String(Results)
End Function
#End Region
#Region "Decrypt"
' Decrypt using Password from Property (pre-hashed)
Public Function Decrypt(ByVal Message As String) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = Me.bPassword
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
Dim DataToDecrypt() As Byte = Convert.FromBase64String(Message)
Try
Dim Decryptor As ICryptoTransform = TDESAlgorithm.CreateDecryptor
Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length)
Finally
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
Return UTF8.GetString(Results)
End Function
' Decrypt using Password as Byte array
Public Function Decrypt(ByVal Message As String, ByVal Password() As Byte) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = HashProvider.ComputeHash(UTF8.GetBytes(UTF8.GetString(Password)))
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
Dim DataToDecrypt() As Byte = Convert.FromBase64String(Message)
Try
Dim Decryptor As ICryptoTransform = TDESAlgorithm.CreateDecryptor
Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length)
Finally
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
Return UTF8.GetString(Results)
End Function
' Decrypt using Password as string
Public Function Decrypt(ByVal Message As String, ByVal Password As String) As String
Dim Results() As Byte
Dim UTF8 As System.Text.UTF8Encoding = New System.Text.UTF8Encoding
' Step 1. We hash the pass phrase using MD5
' We use the MD5 hash generator as the result is a 128-bit byte array
' which is a valid length for the Triple DES encoder we use below
Using HashProvider As MD5CryptoServiceProvider = New MD5CryptoServiceProvider()
Dim TDESKey() As Byte = HashProvider.ComputeHash(UTF8.GetBytes(Password))
' Step 2. Create a new TripleDESCryptoServiceProvider object
' Step 3. Setup the decoder
Using TDESAlgorithm As TripleDESCryptoServiceProvider = New TripleDESCryptoServiceProvider() With {.Key = TDESKey, .Mode = CipherMode.ECB, .Padding = PaddingMode.PKCS7}
' Step 4. Convert the input string to a byte[]
Dim DataToDecrypt() As Byte = Convert.FromBase64String(Message)
' Step 5. Attempt to decrypt the string
Try
Dim Decryptor As ICryptoTransform = TDESAlgorithm.CreateDecryptor
Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length)
Finally
' Clear the Triple Des and Hash provider services of any sensitive information
TDESAlgorithm.Clear()
HashProvider.Clear()
End Try
End Using
End Using
' Step 6. Return the decrypted string in UTF8 format
Return UTF8.GetString(Results)
End Function
#End Region
End Class
Dim tdes As New TripleDES("12345")
Dim vbEncrypted = tdes.Encrypt("Encrypted using VB.NET")
Dim phpEncrypted = "5Ittyr0+jiI7QQmPrvSVnMc9MEWQCjAN"
Debug.Print("PHP Encrypted: " & phpEncrypted)
Debug.Print("VB Encrypted: " & vbEncrypted)
Debug.Print("PHP Encrypted (decrypted result): " & tdes.Decrypt(phpEncrypted))
Debug.Print("VB Encrypted (decrypted result): " & tdes.Decrypt(vbEncrypted))
class TripleDES {
private $bPassword;
private $sPassword;
function __construct($Password) {
$this->bPassword = md5(utf8_encode($Password),TRUE);
$this->bPassword .= substr($this->bPassword,0,8);
$this->sPassword - $Password;
}
function Password($Password = "") {
if($Password == "") {
return $this->sPassword;
} else {
$this->bPassword = md5(utf8_encode($Password),TRUE);
$this->bPassword .= substr($this->bPassword,0,8);
$this->sPassword - $Password;
}
}
function PasswordHash() {
return $this->bPassword;
}
function Encrypt($Message, $Password = "") {
if($Password <> "") { $this->Password($Password); }
$size=mcrypt_get_block_size('tripledes','ecb');
$padding=$size-((strlen($Message)) % $size);
$Message .= str_repeat(chr($padding),$padding);
$encrypt = mcrypt_encrypt('tripledes',$this->bPassword,$Message,'ecb');
return base64_encode($encrypt);
}
function Decrypt($message, $Password = "") {
if($Password <> "") { $this->Password($Password); }
return trim(mcrypt_decrypt('tripledes', $this->bPassword, base64_decode($message), 'ecb'), ord(2));
}
}
$tdes = new TripleDES("12345");
$phpEncrypted = $tdes->encrypt("Encrypted using PHP");
$vbEncrypted = "5Ittyr0+jiI7QQmPrvSVnP3s2CeoTJmF"; // Encrypted using VB.NET
echo "PHP Encrypted: " . $phpEncrypted . '<br />';
echo "VB Encrypted: " . $vbEncrypted . '<br />';
echo "PHP Encrypted (decrypted result): " . $tdes->Decrypt($phpEncrypted) . '<br />';
echo "VB Encrypted (decrypted result): " . $tdes->Decrypt($vbEncrypted) . '<br />';
我尽我所能使这两个类的可用性级别与语言自然允许的级别相同。由于 PHP 不允许重载函数，因此我不得不使用密码作为可选参数，它是一个字符串值。 VB.NET 解决方案有一个额外的覆盖，允许您在加密/解密函数上传递密码字符串的字节值。提供的示例代码显示了每个类的用法，显示了实例化对象的最简单形式，这两个类都允许在创建对象时设置密码。
对于那些绞尽脑汁试图为 Triple DES 寻找可行的双向解决方案的其他人(并且不想被迫进入每个人似乎都指向的盒子 -- Rijndael)，那么这个解决方案适合您，您可以停止用头撞墙。
添加了 VB.NET TripleDES 类的 C# 翻译
using System;
using System.Security.Cryptography;
public class TripleDES {
private byte[] bPassword;
private string sPassword;
public TripleDES( string Password = "password" ) {
// On Class Begin
this.Password = Password;
}
public string PasswordHash {
get {
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
return UTF8.GetString( bPassword );
}
}
public string Password {
get {
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
return sPassword;
}
set {
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
bPassword = HashProvider.ComputeHash( UTF8.GetBytes( value ) );
sPassword = value;
}
}
#region "Encrypt"
// Encrypt using Password from Property Set (pre-hashed)
public string Encrypt( string Message ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = bPassword;
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
byte[] DataToEncrypt = UTF8.GetBytes( Message );
try {
ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
Results = Encryptor.TransformFinalBlock( DataToEncrypt, 0, DataToEncrypt.Length );
} finally {
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
return Convert.ToBase64String( Results );
}
// Encrypt using Password as byte array
private string Encrypt( string Message, byte[] Password ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = HashProvider.ComputeHash( UTF8.GetBytes( UTF8.GetString( Password ) ) );
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
byte[] DataToEncrypt = UTF8.GetBytes( Message );
try {
ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
Results = Encryptor.TransformFinalBlock( DataToEncrypt, 0, DataToEncrypt.Length );
} finally {
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
return Convert.ToBase64String( Results );
}
// Encrypt using Password as string
public string Encrypt( string Message, string Password ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
// Step 1. We hash the Passphrase using MD5
// We use the MD5 hash generator as the result is a 128 bit byte array
// which is a valid length for the Triple DES encoder we use below
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = HashProvider.ComputeHash( UTF8.GetBytes( Password ) );
// Step 2. Create a new TripleDESCryptoServiceProvider object
// Step 3. Setup the encoder
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
// Step 4. Convert the input string to a byte[]
byte[] DataToEncrypt = UTF8.GetBytes( Message );
// Step 5. Attempt to encrypt the string
try {
ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
Results = Encryptor.TransformFinalBlock( DataToEncrypt, 0, DataToEncrypt.Length );
} finally {
// Clear the Triple Des and Hashprovider services of any sensitive information
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
// Step 6. Return the encrypted string as a base64 encoded string
return Convert.ToBase64String( Results );
}
#endregion
#region "Decrypt"
// Decrypt using Password from Property (pre-hashed)
public string Decrypt( string Message ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = this.bPassword;
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
byte[] DataToDecrypt = Convert.FromBase64String( Message );
try {
ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
Results = Decryptor.TransformFinalBlock( DataToDecrypt, 0, DataToDecrypt.Length );
} finally {
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
return UTF8.GetString( Results );
}
// Decrypt using Password as Byte array
public string Decrypt( string Message, byte[] Password ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = HashProvider.ComputeHash( UTF8.GetBytes( UTF8.GetString( Password ) ) );
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
byte[] DataToDecrypt = Convert.FromBase64String( Message );
try {
ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
Results = Decryptor.TransformFinalBlock( DataToDecrypt, 0, DataToDecrypt.Length );
} finally {
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
return UTF8.GetString( Results );
}
// Decrypt using Password as string
public string Decrypt( string Message, string Password ) {
byte[] Results = null;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
// Step 1. We hash the pass phrase using MD5
// We use the MD5 hash generator as the result is a 128-bit byte array
// which is a valid length for the Triple DES encoder we use below
using ( MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider() ) {
byte[] TDESKey = HashProvider.ComputeHash( UTF8.GetBytes( Password ) );
// Step 2. Create a new TripleDESCryptoServiceProvider object
// Step 3. Setup the decoder
using ( TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider { Key = TDESKey, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 } ) {
// Step 4. Convert the input string to a byte[]
byte[] DataToDecrypt = Convert.FromBase64String( Message );
// Step 5. Attempt to decrypt the string
try {
ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
Results = Decryptor.TransformFinalBlock( DataToDecrypt, 0, DataToDecrypt.Length );
} finally {
// Clear the Triple Des and Hash provider services of any sensitive information
TDESAlgorithm.Clear();
HashProvider.Clear();
}
}
}
// Step 6. Return the decrypted string in UTF8 format
return UTF8.GetString( Results );
}
#endregion
}
关于php - 在 VB.NET 中加密并在 PHP 中解密，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24709331/
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def char_check(x,y): if (str(x) in y or x.find(y) > -1) or (str(y) in x or y.find(x) > -1):
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我有一个新项目，我正在尝试设置 Django 调试工具栏。首先，我尝试了快速设置，它只涉及将 'debug_toolbar' 添加到我的已安装应用程序列表中。有了这个，当我转到我的根 URL 时，调试
在 Matlab 中，如果我有一个函数 f，例如签名是 f(a,b,c)，我可以创建一个只有一个变量 b 的函数，它将使用固定的 a=a1 和 c=c1 调用 f: g = @(b) f(a1, b,
我不明白为什么 ForEach 中的元素之间有多余的垂直间距在 VStack 里面在 ScrollView 里面使用 GeometryReader 时渲染自定义水平分隔线。 Scrol
我想知道，是否有关于何时使用 session 和 cookie 的指南或最佳实践？ 什么应该和什么不应该存储在其中？谢谢! 最佳答案 这些文档很好地了解了 session cookie 的安全问题以及
我在 scipy/numpy 中有一个 Nx3 矩阵，我想用它制作一个 3 维条形图，其中 X 轴和 Y 轴由矩阵的第一列和第二列的值、高度确定每个条形的 是矩阵中的第三列，条形的数量由 N 确定。
假设我用两种不同的方式初始化信号量 sem_init(&randomsem,0,1) sem_init(&randomsem,0,0) 现在， sem_wait(&randomsem) 在这两种情况下
我怀疑该值如何存储在“WORD”中，因为 PStr 包含实际输出。？ 既然Pstr中存储的是小写到大写的字母，那么在printf中如何将其给出为“WORD”。有人可以吗？解释一下？ #include
我有一个 3x3 数组: var my_array = [[0,1,2], [3,4,5], [6,7,8]]; 并想获得它的第一个 2
我意识到您可以使用如下方式轻松检查焦点: var hasFocus = true; $(window).blur(function(){ hasFocus = false; }); $(win
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