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SHA1CryptoServiceProvider Class

.NET Framework 2.0

Computes the SHA1 hash value for the input data using the implementation provided by the cryptographic service provider (CSP). This class cannot be inherited.

Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)

Syntax

C++

Copy

[ComVisibleAttribute(true)] 
public sealed class SHA1CryptoServiceProvider : SHA1

Copy

/** @attribute ComVisibleAttribute(true) */ 
public final class SHA1CryptoServiceProvider extends SHA1

JScript

Copy

ComVisibleAttribute(true) 
public final class SHA1CryptoServiceProvider extends SHA1

Remarks

The hash size for the SHA1CryptoServiceProvider class is 160 bits.

Example

The following code example computes the SHA1 hash value for data and stores it in result. This example assumes that there is a predefined constant DATA_SIZE.

C++

Copy

byte[] data = new byte[DATA_SIZE];

byte[] result; 
 
SHA1 sha = new SHA1CryptoServiceProvider(); 
// This is one implementation of the abstract class SHA1.

result = sha.ComputeHash(data);

Copy

ubyte data[] = new ubyte[data_Size];
ubyte result[];
SHA1 sha = new SHA1CryptoServiceProvider();

// This is one implementation of the abstract class SHA1.
result = sha.ComputeHash(data);

Inheritance Hierarchy

System.Object
   System.Security.Cryptography.HashAlgorithm
     System.Security.Cryptography.SHA1
      System.Security.Cryptography.SHA1CryptoServiceProvider

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

Version Information

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

Reference

SHA1CryptoServiceProvider Members
System.Security.Cryptography Namespace

Other Resources

Cryptographic Services

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FAQ

Generating the SHA1 Checksum for a file

The following code demonstrates how to generate the SHA1 checksum for a local file

private string ComputeSHA1Checksum(string filePath)
{
    string strResult = "";
    string strHashData = "";

    byte[] arrbytHashValue;
    System.IO.FileStream oFileStream = null;

    System.Security.Cryptography.SHA1CryptoServiceProvider oSHA1Hasher =
               new System.Security.Cryptography.SHA1CryptoServiceProvider();

    try
    {
        oFileStream = GetFileStream(filePath);
        arrbytHashValue = oSHA1Hasher.ComputeHash(oFileStream);
        oFileStream.Close();

        strHashData = System.BitConverter.ToString(arrbytHashValue);
        strHashData = strHashData.Replace("-", "");
        strResult = strHashData;
    }
    catch (System.Exception ex)
    {
        System.Windows.Forms.MessageBox.Show(ex.Message, "Error!",
                 System.Windows.Forms.MessageBoxButtons.OK,
                 System.Windows.Forms.MessageBoxIcon.Error,
                 System.Windows.Forms.MessageBoxDefaultButton.Button1);
    }

    return (strResult);
}

History

6/6/2006
Mark Schmidt-MSFT