CryptoStream Constructor

Initializes a new instance of the CryptoStream class with a target data stream, the transformation to use, and the mode of the stream.

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

public CryptoStream(
	Stream stream,
	ICryptoTransform transform,
	CryptoStreamMode mode
)

Parameters

stream
Type: System.IO.Stream
The stream on which to perform the cryptographic transformation.
transform
Type: System.Security.Cryptography.ICryptoTransform
The cryptographic transformation that is to be performed on the stream.
mode
Type: System.Security.Cryptography.CryptoStreamMode
One of the enumeration values that specifies whether to read or write the cryptographic stream.

ExceptionCondition
ArgumentException

stream is not readable.

ArgumentException

stream is not writable.

ArgumentException

stream is invalid.

Any object that derives from Stream can be passed into the stream parameter. Any object that implements ICryptoTransform (such as HashAlgorithm) can be passed into the transform parameter.

The following example demonstrates how to use the CryptoStream constructor when you encrypt an isolated storage file. This code example is part of a larger example provided for the AesManaged class.


using (Aes aes = new AesManaged())
{
    Rfc2898DeriveBytes deriveBytes = new Rfc2898DeriveBytes(passwordBox.Password, Encoding.UTF8.GetBytes(PasswordSalt));
    aes.Key = deriveBytes.GetBytes(128 / 8);
    isoStoreStream.Write(BitConverter.GetBytes(aes.IV.Length), 0, sizeof(int));
    isoStoreStream.Write(aes.IV, 0, aes.IV.Length);

    using (CryptoStream cs = new CryptoStream(isoStoreStream, aes.CreateEncryptor(), CryptoStreamMode.Write))
    {
        byte[] rawPlaintext = Encoding.Unicode.GetBytes(inputBox.Text);
        cs.Write(rawPlaintext, 0, rawPlaintext.Length);
        cs.FlushFinalBlock();
    }
}


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Windows Phone OS 7.0

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

Community Additions

ADD
Show: