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Rfc2898DeriveBytes Constructor (String, Int32, Int32)

Updated: December 2008

Initializes a new instance of the Rfc2898DeriveBytes class using a password, a salt size, and number of iterations to derive the key.

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

public:
Rfc2898DeriveBytes(
	String^ password, 
	int saltSize, 
	int iterations
)

Parameters

password
Type: System::String

The password used to derive the key.

saltSize
Type: System::Int32

The size of the random salt that you want the class to generate.

iterations
Type: System::Int32

The number of iterations for the operation.

ExceptionCondition
ArgumentException

The specified salt size is smaller than 8 bytes or the iteration count is less than 1.

ArgumentNullException

The password or salt is nullptr.

ArgumentOutOfRangeException

iterations is out of range. This parameter requires a non-negative number.

The salt size must be 8 bytes or larger and the iteration count must be greater than zero. The minimum recommended number of iterations is 1000.

RFC 2898 includes methods for creating a key and initialization vector (IV) from a password and salt. You can use PBKDF2, a password-based key derivation function, to derive keys using a pseudo-random function that allows keys of virtually unlimited length to be generated. The Rfc2898DeriveBytes class can be used to produce a derived key from a base key and other parameters. In a password-based key derivation function, the base key is a password and the other parameters are a salt value and an iteration count.

For more information on PBKDF2, see RFC 2898,"PKCS #5: Password-Based Cryptography Specification Version 2.0," available on the Request for Comments Web site. See section 5.2, "PBKDF2," for complete details.

Security noteSecurity Note:

Never hard-code a password within your source code. Hard-coded passwords can be retrieved from an assembly by using the MSIL Disassembler (Ildasm.exe), by using a hexadecimal editor, or by simply opening up the assembly in a text editor such as Notepad.exe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

Date

History

Reason

December 2008

Removed incorrect sample.

Customer feedback.

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