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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.ripemd160managed below:

RIPEMD160Managed Class (System.Security.Cryptography) | Microsoft Learn

Computes the RIPEMD160 hash for the input data using the managed library.

public ref class RIPEMD160Managed : System::Security::Cryptography::RIPEMD160

[System.Runtime.InteropServices.ComVisible(true)]
public class RIPEMD160Managed : System.Security.Cryptography.RIPEMD160

[<System.Runtime.InteropServices.ComVisible(true)>]
type RIPEMD160Managed = class
    inherit RIPEMD160

Public Class RIPEMD160Managed
Inherits RIPEMD160

Inheritance

Attributes

The following code example shows how to encode a file using the RIPEMD160Managed class and then how to decode the file.

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

RIPEMD-160 is a 160-bit cryptographic hash function. It is intended for use as a secure replacement for the 128-bit hash functions MD4, MD5, and RIPEMD. RIPEMD was developed in the framework of the EU project RIPE (RACE Integrity Primitives Evaluation, 1988-1992).

Releases all resources used by the HashAlgorithm class.

Computes the hash value for the specified region of the specified byte array.

Computes the hash value for the specified byte array.

Computes the hash value for the specified Stream object.

Releases all resources used by the current instance of the HashAlgorithm class.

Releases the unmanaged resources used by the HashAlgorithm and optionally releases the managed resources.

Determines whether the specified object is equal to the current object.

Serves as the default hash function.

Gets the Type of the current instance.

When overridden in a derived class, routes data written to the object into the RIPEMD160 hash algorithm for computing the hash.

When overridden in a derived class, finalizes the hash computation after the last data is processed by the cryptographic stream object.

Initializes an instance of the RIPEMD160Managed class using the managed library.

Creates a shallow copy of the current Object.

Returns a string that represents the current object.

Computes the hash value for the specified region of the input byte array and copies the specified region of the input byte array to the specified region of the output byte array.

Computes the hash value for the specified region of the specified byte array.

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