RSACryptoServiceProvider.SignData Method (Byte[], Int32, Int32, Object)

Computes the hash value of a subset of the specified byte array using the specified hash algorithm, and signs the resulting hash value.

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

[SecuritySafeCriticalAttribute]
public byte[] SignData(
	byte[] buffer,
	int offset,
	int count,
	Object halg
)

Parameters

buffer
Type: System.Byte[]
The input data for which to compute the hash.
offset
Type: System.Int32
The offset into the array from which to begin using data.
count
Type: System.Int32
The number of bytes in the array to use as data.
halg
Type: System.Object
The hash algorithm to use to create the hash value.

Return Value

Type: System.Byte[]
The RSA signature for the specified data.

ExceptionCondition
ArgumentNullException

The halg parameter is null.

ArgumentException

The halg parameter is not a valid type.

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

The halg parameter can accept a String, a HashAlgorithm, or a Type. The string value can be one of the following:

  • The object identifier (OID) friendly name of the hash algorithm to use, either a name registered in the crypto config file or one in the Crypto API OID table.

  • The OID value. The OID must be one recognized by the Crypto API.

For example, you could use SignData(new byte[5], "1.3.14.3.2.26") or SignData(new byte[5], "sha1"), or SignData(new byte[5], "SHA1").

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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