RIPEMD160 類別
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
表示抽象類別，MD160 雜湊演算法的所有實作均繼承自此類別。
public ref class RIPEMD160 abstract : System::Security::Cryptography::HashAlgorithm[System.Runtime.InteropServices.ComVisible(true)]
public abstract class RIPEMD160 : System.Security.Cryptography.HashAlgorithm[<System.Runtime.InteropServices.ComVisible(true)>]
type RIPEMD160 = class
inherit HashAlgorithmPublic MustInherit Class RIPEMD160
Inherits HashAlgorithm- 繼承
- 衍生
- 屬性
範例
下列程式代碼範例會 RIPEMD160 計算目錄中所有檔案的哈希。
using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;
// Print the byte array in a readable format.
void PrintByteArray( array<Byte>^array )
{
int i;
for ( i = 0; i < array->Length; i++ )
{
Console::Write( String::Format( "{0:X2}", array[ i ] ) );
if ( (i % 4) == 3 )
Console::Write( " " );
}
Console::WriteLine();
}
int main()
{
array<String^>^args = Environment::GetCommandLineArgs();
if ( args->Length < 2 )
{
Console::WriteLine( "Usage: hashdir <directory>" );
return 0;
}
try
{
// Create a DirectoryInfo object representing the specified directory.
DirectoryInfo^ dir = gcnew DirectoryInfo( args[ 1 ] );
// Get the FileInfo objects for every file in the directory.
array<FileInfo^>^files = dir->GetFiles();
// Initialize a RIPE160 hash object.
RIPEMD160 ^ myRIPEMD160 = RIPEMD160Managed::Create();
array<Byte>^hashValue;
// Compute and print the hash values for each file in directory.
System::Collections::IEnumerator^ myEnum = files->GetEnumerator();
while ( myEnum->MoveNext() )
{
FileInfo^ fInfo = safe_cast<FileInfo^>(myEnum->Current);
// Create a fileStream for the file.
FileStream^ fileStream = fInfo->Open( FileMode::Open );
// Compute the hash of the fileStream.
hashValue = myRIPEMD160->ComputeHash( fileStream );
// Write the name of the file to the Console.
Console::Write( "{0}: ", fInfo->Name );
// Write the hash value to the Console.
PrintByteArray( hashValue );
// Close the file.
fileStream->Close();
}
return 0;
}
catch ( DirectoryNotFoundException^ )
{
Console::WriteLine( "Error: The directory specified could not be found." );
}
catch ( IOException^ )
{
Console::WriteLine( "Error: A file in the directory could not be accessed." );
}
}
using System;
using System.IO;
using System.Security.Cryptography;
using System.Windows.Forms;
public class HashDirectory
{
[STAThreadAttribute]
public static void Main(String[] args)
{
string directory = "";
if (args.Length < 1)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();
DialogResult dr = fbd.ShowDialog();
if (dr == DialogResult.OK)
{
directory = fbd.SelectedPath;
}
else
{
Console.WriteLine("No directory selected.");
return;
}
}
else
{
directory = args[0];
}
try
{
// Create a DirectoryInfo object representing the specified directory.
DirectoryInfo dir = new DirectoryInfo(directory);
// Get the FileInfo objects for every file in the directory.
FileInfo[] files = dir.GetFiles();
// Initialize a RIPE160 hash object.
RIPEMD160 myRIPEMD160 = RIPEMD160Managed.Create();
byte[] hashValue;
// Compute and print the hash values for each file in directory.
foreach (FileInfo fInfo in files)
{
// Create a fileStream for the file.
FileStream fileStream = fInfo.Open(FileMode.Open);
// Be sure it's positioned to the beginning of the stream.
fileStream.Position = 0;
// Compute the hash of the fileStream.
hashValue = myRIPEMD160.ComputeHash(fileStream);
// Write the name of the file to the Console.
Console.Write(fInfo.Name + ": ");
// Write the hash value to the Console.
PrintByteArray(hashValue);
// Close the file.
fileStream.Close();
}
return;
}
catch (DirectoryNotFoundException)
{
Console.WriteLine("Error: The directory specified could not be found.");
}
catch (IOException)
{
Console.WriteLine("Error: A file in the directory could not be accessed.");
}
}
// Print the byte array in a readable format.
public static void PrintByteArray(byte[] array)
{
int i;
for (i = 0; i < array.Length; i++)
{
Console.Write(String.Format("{0:X2}", array[i]));
if ((i % 4) == 3) Console.Write(" ");
}
Console.WriteLine();
}
}
Imports System.IO
Imports System.Security.Cryptography
Imports System.Windows.Forms
Public Class HashDirectory
Public Shared Sub Main(ByVal args() As String)
Dim directory As String
If args.Length < 1 Then
Dim fdb As New FolderBrowserDialog
Dim dr As DialogResult = fdb.ShowDialog()
If (dr = DialogResult.OK) Then
directory = fdb.SelectedPath
Else
Console.WriteLine("No directory selected")
Return
End If
Else
directory = args(0)
End If
Try
' Create a DirectoryInfo object representing the specified directory.
Dim dir As New DirectoryInfo(directory)
' Get the FileInfo objects for every file in the directory.
Dim files As FileInfo() = dir.GetFiles()
' Initialize a RIPE160 hash object.
Dim myRIPEMD160 As RIPEMD160 = RIPEMD160Managed.Create()
Dim hashValue() As Byte
' Compute and print the hash values for each file in directory.
Dim fInfo As FileInfo
For Each fInfo In files
' Create a fileStream for the file.
Dim fileStream As FileStream = fInfo.Open(FileMode.Open)
' Be sure it's positioned to the beginning of the stream.
fileStream.Position = 0
' Compute the hash of the fileStream.
hashValue = myRIPEMD160.ComputeHash(fileStream)
' Write the name of the file to the Console.
Console.Write(fInfo.Name + ": ")
' Write the hash value to the Console.
PrintByteArray(hashValue)
' Close the file.
fileStream.Close()
Next fInfo
Return
Catch DExc As DirectoryNotFoundException
Console.WriteLine("Error: The directory specified could not be found.")
Catch IOExc As IOException
Console.WriteLine("Error: A file in the directory could not be accessed.")
End Try
End Sub
' Print the byte array in a readable format.
Public Shared Sub PrintByteArray(ByVal array() As Byte)
Dim i As Integer
For i = 0 To array.Length - 1
Console.Write(String.Format("{0:X2}", array(i)))
If i Mod 4 = 3 Then
Console.Write(" ")
End If
Next i
Console.WriteLine()
End Sub
End Class
備註
哈希函式會將任意長度的二進位字串對應至固定長度的小型二進位字串。 密碼編譯哈希函式具有無法計算的 屬性，可尋找哈希為相同值的兩個相異輸入;也就是說，如果對應的數據也相符，則兩組數據的哈希應該相符。 對數據的小型變更會導致哈希發生大量無法預測的變更。
RIPEMD-160 是 160 位的密碼編譯哈希函式。 它是用來取代 128 位哈希函式 MD4、MD5 和 RIPEMD。 RIPEMD 是在 EU 專案 RIPE (RACE Integrity Primitives Evaluation 的架構中開發，1988-1992) 。
注意
RIPEMD160 已由安全哈希演算法 SHA-256 和 SHA-512 及其衍生類別取代。 SHA256 和 SHA512 提供比 RIPEMD160更好的安全性和效能。 RIPEMD160僅用於與舊版應用程式和數據的相容性。
建構函式
| RIPEMD160() |
初始化 RIPEMD160 類別的新執行個體。 |
欄位
| HashSizeValue |
代表計算出來之雜湊碼的大小，以位元為單位。 (繼承來源 HashAlgorithm) |
| HashValue |
表示計算出來的雜湊碼的值。 (繼承來源 HashAlgorithm) |
| State |
表示雜湊計算的狀態。 (繼承來源 HashAlgorithm) |
屬性
| CanReuseTransform |
取得值，表示目前的轉換是否可重複使用。 (繼承來源 HashAlgorithm) |
| CanTransformMultipleBlocks |
在衍生類別中覆寫時，取得值以指出是否有多個區塊可被轉換。 (繼承來源 HashAlgorithm) |
| Hash |
取得計算出來之雜湊碼的值。 (繼承來源 HashAlgorithm) |
| HashSize |
取得計算出來之雜湊碼的大小，以位元為單位。 (繼承來源 HashAlgorithm) |
| InputBlockSize |
在衍生類別中覆寫時，取得輸入區塊的大小。 (繼承來源 HashAlgorithm) |
| OutputBlockSize |
在衍生類別中覆寫時，取得輸出區塊的大小。 (繼承來源 HashAlgorithm) |
方法
明確介面實作
| IDisposable.Dispose() |
釋放 HashAlgorithm 所使用的 Unmanaged 資源，並選擇性地釋放 Managed 資源。 (繼承來源 HashAlgorithm) |
