DSACryptoServiceProvider.VerifyHash Method (Byte[], String, Byte[])


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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.

Exception Condition

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
Available since 1.1
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