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SHA1 Class

Computes the SHA1 hash for the input data.

For a list of all members of this type, see SHA1 Members.

System.Object
   System.Security.Cryptography.HashAlgorithm
      System.Security.Cryptography.SHA1
         System.Security.Cryptography.SHA1CryptoServiceProvider
         System.Security.Cryptography.SHA1Managed

[Visual Basic]
MustInherit Public Class SHA1
   Inherits HashAlgorithm
[C#]
public abstract class SHA1 : HashAlgorithm
[C++]
public __gc __abstract class SHA1 : public HashAlgorithm
[JScript]
public abstract class SHA1 extends HashAlgorithm

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.

Remarks

The hash is used as a unique value of fixed size representing a large amount of data. Hashes of two sets of data should match if the corresponding data also matches. Small changes to the data result in large, unpredictable changes in the hash.

The hash size for the SHA1 algorithm is 160 bits.

Example

[Visual Basic, C#, C++] The following example computes the SHA1 hash for data and stores it in result. This example assumes that there is a predefined constant DATA_SIZE.

[Visual Basic] 
Dim data(DATA_SIZE) As Byte
Dim result() As Byte
       
Dim sha As New SHA1CryptoServiceProvider()
' This is one implementation of the abstract class SHA1.
result = sha.ComputeHash(data)

[C#] 
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);

[C++] 
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);

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Security.Cryptography

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: Mscorlib (in Mscorlib.dll)

See Also

SHA1 Members | System.Security.Cryptography Namespace | Cryptographic Services

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