• Article

RSACryptoServiceProvider.VerifyData Method

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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 hash value of the provided data.

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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Function VerifyData ( _
    buffer As Byte(), _
    halg As Object, _
    signature As Byte() _
) As Boolean

[SecuritySafeCriticalAttribute]
public bool VerifyData(
    byte[] buffer,
    Object halg,
    byte[] signature
)

Parameters

  • buffer
    Type: array<System.Byte[]
    The data that was signed.
  • halg
    Type: System.Object
    The name of the hash algorithm used to create the hash value of the data.
  • signature
    Type: array<System.Byte[]
    The signature data to be verified.

Return Value

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

Exceptions

Exception Condition
ArgumentNullException

The halg parameter is nulla null reference (Nothing in Visual Basic).
ArgumentException

The halg parameter is not a valid type.

Remarks

This method verifies the RSA digital signature produced by the SignData 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.

The halg parameter can accept a String, a HashAlgorithm, or a Type.

Version Information

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1

Platforms

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