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DSACryptoServiceProvider.VerifyHash Method

Verifies the specified signature data by comparing it to the signature computed for the specified hash value.

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

public bool VerifyHash(
	byte[] rgbHash,
	string str,
	byte[] rgbSignature


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.

Type: System.Byte[]

The signature data to be verified.

Return Value

Type: System.Boolean
true if the signature verifies as valid; otherwise, false.


The rgbHash parameter is null.


The rgbSignature parameter is null.


The cryptographic service provider (CSP) cannot be acquired.


The signature cannot be verified.

This method verifies the DSA digital signature produced by SignHash.

If the str parameter is null, the default hash algorithm (SHA1) is used. The valid hash algorithms is SHA1.

.NET Framework

Supported in: 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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