Encrypts the data in a specified byte array and returns a byte array that contains the encrypted data.
Namespace: System.Security.Cryptography
Assembly: mscorlib.Extensions (in mscorlib.Extensions.dll)
<SecuritySafeCriticalAttribute> _ Public Shared Function Protect ( _ userData As Byte(), _ optionalEntropy As Byte() _ ) As Byte()
[SecuritySafeCriticalAttribute] public static byte[] Protect( byte[] userData, byte[] optionalEntropy )
Parameters
- userData
- Type: System.Byte[]
A byte array that contains data to encrypt.
- optionalEntropy
- Type: System.Byte[]
An optional additional byte array used to increase the complexity of the encryption, or null for no additional complexity.
| Exception | Condition |
|---|---|
| ArgumentNullException |
The userData parameter is null. |
| CryptographicException |
The encryption failed. |
| NotSupportedException |
The operating system does not support this method. |
| OutOfMemoryException |
The system ran out of memory while encrypting the data. |
This method can be used to encrypt data such as passwords, keys, or connection strings. The optionalEntropy parameter enables you to add data to increase the complexity of the encryption; specify null for no additional complexity. If provided, this information must also be used when decrypting the data using the Unprotect method.
Note:
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If you use this method during impersonation, you may receive the following error: "Key not valid for use in specified state." To prevent this error, load the profile of the user you want to impersonate before calling the method. |
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.