FromBase64Transform Class
.NET Framework 3.0
Converts a CryptoStream from base 64.
Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)
System.Security.Cryptography Namespace
Assembly: mscorlib (in mscorlib.dll)
[ComVisibleAttribute(true)] public class FromBase64Transform : ICryptoTransform, IDisposable
/** @attribute ComVisibleAttribute(true) */ public class FromBase64Transform implements ICryptoTransform, IDisposable
ComVisibleAttribute(true) public class FromBase64Transform implements ICryptoTransform, IDisposable
Not applicable.
The following example decrypts a base 64-encoded file to an output text file.
using System; using System.IO; using System.Security.Cryptography; namespace ToBase64Transform_Examples { class MyMainClass { public static void Main() { //Insert your file names into this method call. DecodeFromFile("c:\\encoded.txt", "c:\\roundtrip.txt"); } public static void DecodeFromFile(string inFileName, string outFileName) { FromBase64Transform myTransform = new FromBase64Transform(FromBase64TransformMode.IgnoreWhiteSpaces); byte[] myOutputBytes = new byte[myTransform.OutputBlockSize]; //Open the input and output files. FileStream myInputFile = new FileStream(inFileName, FileMode.Open, FileAccess.Read); FileStream myOutputFile = new FileStream(outFileName, FileMode.Create, FileAccess.Write); //Retrieve the file contents into a byte array. byte[] myInputBytes = new byte[myInputFile.Length]; myInputFile.Read(myInputBytes, 0, myInputBytes.Length); //Transform the data in chunks the size of InputBlockSize. int i = 0; while(myInputBytes.Length - i > 4/*myTransform.InputBlockSize*/) { myTransform.TransformBlock(myInputBytes, i, 4/*myTransform.InputBlockSize*/, myOutputBytes, 0); i += 4/*myTransform.InputBlockSize*/; myOutputFile.Write(myOutputBytes, 0, myTransform.OutputBlockSize); } //Transform the final block of data. myOutputBytes = myTransform.TransformFinalBlock(myInputBytes, i, myInputBytes.Length - i); myOutputFile.Write(myOutputBytes, 0, myOutputBytes.Length); //Free up any used resources. myTransform.Clear(); myInputFile.Close(); myOutputFile.Close(); } } }
package ToBase64Transform_Examples;
import System.*;
import System.IO.*;
import System.Security.Cryptography.*;
class MyMainClass
{
public static void main(String[] args)
{
// Insert your file names into this method call.
DecodeFromFile("c:\\encoded.txt", "c:\\roundtrip.txt");
} //main
public static void DecodeFromFile(String inFileName, String outFileName)
{
FromBase64Transform myTransform =
new FromBase64Transform(FromBase64TransformMode.IgnoreWhiteSpaces);
ubyte myOutputBytes[] = new ubyte[myTransform.get_OutputBlockSize()];
// Open the input and output files.
FileStream myInputFile =
new FileStream(inFileName, FileMode.Open, FileAccess.Read);
FileStream myOutputFile =
new FileStream(outFileName, FileMode.Create, FileAccess.Write);
// Retrieve the file contents into a byte array.
// const int temp = 2;
ubyte myInputBytes[] =
new ubyte[(new Long(myInputFile.get_Length())).intValue()];
myInputFile.Read(myInputBytes, 0, myInputBytes.length);
// Transform the data in chunks the size of InputBlockSize.
int i = 0;
while (myInputBytes.length - i > 4/*myTransform.InputBlockSize*/) {
myTransform.TransformBlock(myInputBytes, i,
4/*myTransform.InputBlockSize*/, myOutputBytes, 0);
i += 4 /*myTransform.InputBlockSize*/;
myOutputFile.Write(myOutputBytes, 0,
myTransform.get_OutputBlockSize());
}
// Transform the final block of data.
myOutputBytes = myTransform.TransformFinalBlock(myInputBytes,
i, myInputBytes.length - i);
myOutputFile.Write(myOutputBytes, 0, myOutputBytes.length);
// Free up any used resources.
myTransform.Clear();
myInputFile.Close();
myOutputFile.Close();
} //DecodeFromFile
} //MyMainClass
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Reference
FromBase64Transform MembersSystem.Security.Cryptography Namespace
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