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RSACryptoServiceProvider.VerifyHash Method

Verifies that a digital signature is valid by determining the hash value in the signature using the provided public key and comparing it to the provided hash value.

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

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


Type: System.Byte[]
The hash value of the signed data.
Type: System.String
The hash algorithm identifier (OID) 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 is 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 RSA digital signature produced by the SignHash method. The signature is verified by obtaining the hash value from the signature using the public key it was signed with, and comparing that value to the hash value of the provided data.

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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