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DSACryptoServiceProvider.SignHash Method

Computes the signature for the specified hash value by encrypting it with the private key.

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

public byte[] SignHash(
	byte[] rgbHash,
	string str


Type: System.Byte[]

The hash value of the data to be signed.

Type: System.String

The name of the hash algorithm used to create the hash value of the data.

Return Value

Type: System.Byte[]
The DSA signature for the specified hash value.


The rgbHash parameter is null.


The cryptographic service provider (CSP) cannot be acquired.


There is no private key.

This method creates a digital signature that is verified using the VerifyHash method.

DSA uses the SHA1 hash algorithm.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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