programming4us
programming4us
SECURITY

Programming Hashing Algorithms (part 4) - Hashing Streamed Data

- How To Install Windows Server 2012 On VirtualBox
- How To Bypass Torrent Connection Blocking By Your ISP
- How To Install Actual Facebook App On Kindle Fire

4. Hashing Streamed Data

You can also create a hash code from a stream of data; this is useful for processing datafiles or for reading data from a network connection. The HashAlgorithm class contains an overloaded version of the ComputeHash method for working with streams:

# C#

public byte[] ComputeHash(
Stream inputStream
);

# Visual Basic .NET

Overloads Public Function ComputeHash( _
ByVal inputStream As Stream _
) As Byte( )

The following class demonstrates how to create a hash code using a stream, in this case streaming data from a file called myfile.txt, which contains the string "Programming .NET Security":

# C#

using System;
using System.IO;
using System.Security.Cryptography;

class StreamHash {

static void Main(string[] args) {

// create the file stream
Stream x_stream = new FileStream("mydata.txt", FileMode.Open);

// create an instance of the MD5 hashing algorithm
HashAlgorithm x_hash_alg = HashAlgorithm.Create("MD5");

// obtain the hash code from the HashAlgorithm by
// using the ComputeHash method
byte[] x_hash_code = x_hash_alg.ComputeHash(x_stream);

// print out the hash code to the console
foreach (byte x_byte in x_hash_code) {
Console.Write("{0:X2} ", x_byte);
}

// close the stream
x_stream.Close( );
}
}

# Visual Basic .NET

Imports System
Imports System.IO
Imports System.Security.Cryptography

Module StreamHash

Sub Main( )
' create the file stream
Dim x_stream As Stream = New FileStream("mydata.txt", FileMode.Open)

' create an instance of the MD5 hashing algorithm
Dim x_hash_alg As HashAlgorithm = HashAlgorithm.Create("MD5")

' obtain the hash code from the HashAlgorithm by
' using the ComputeHash method
Dim x_hash_code( ) As Byte = x_hash_alg.ComputeHash(x_stream)

' print out the hash code to the console
Dim x_byte As Byte
For Each x_byte In x_hash_code
Console.Write("{0:X2} ", x_byte)
Next

' close the stream
x_stream.Close( )

End Sub

End Module


As you might expect, the output from the example, shown below, is the same hash code produced by our first example:

E1 62 9F C2 96 85 C3 A4 5B 94 97 57 D8 9C 65 78

Other  
 
Top 10
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 2) - Wireframes,Legends
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Finding containers and lists in Visio (part 1) - Swimlanes
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Formatting and sizing lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Adding shapes to lists
- Microsoft Visio 2013 : Adding Structure to Your Diagrams - Sizing containers
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 3) - The Other Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 2) - The Data Properties of a Control
- Microsoft Access 2010 : Control Properties and Why to Use Them (part 1) - The Format Properties of a Control
- Microsoft Access 2010 : Form Properties and Why Should You Use Them - Working with the Properties Window
- Microsoft Visio 2013 : Using the Organization Chart Wizard with new data
REVIEW
- First look: Apple Watch

- 3 Tips for Maintaining Your Cell Phone Battery (part 1)

- 3 Tips for Maintaining Your Cell Phone Battery (part 2)
programming4us programming4us
Celebrity Style, Fashion Trends, Beauty and Makeup Tips.
programming4us
 
 
programming4us