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


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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 (in mscorlib.dll)

member SignData : 
        buffer:byte[] *
        offset:int *
        count:int *
        halg:Object -> byte[]


Type: System.Byte[]

The input data for which to compute the hash.

Type: System.Int32

The offset into the array from which to begin using data.

Type: System.Int32

The number of bytes in the array to use as data.

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.

Exception Condition

The halg parameter is null.


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], "") or SignData(new byte[5], "sha1"), or SignData(new byte[5], "SHA1").

The following code example signs and verifies data.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
Windows Phone Silverlight
Available since 7.1
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