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C# Examples

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PBKDF1 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF1. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

It also matches the output produced by the .NET Framework using this C# code:

            byte[] salt = new byte[] { 0x78, 0x57, 0x8E, 0x5A, 0x5D, 0x63, 0xCB, 0x06 };
            PasswordDeriveBytes cdk = new PasswordDeriveBytes("password", salt);

            cdk.IterationCount = 1000;
            cdk.HashName = "SHA1";

            // generate a 16-byte key
            byte[] key = cdk.GetBytes(16);

Download: Chilkat .NET Assemblies

Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

bool success;
success = crypt.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(crypt.LastErrorText);
    return;
}

string hexKey;
//  http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

string pw;
pw = "password";
string pwCharset;
pwCharset = "ansi";
//  Hash algorithms may be: sha1, md2, md5, etc.
string hashAlg;
hashAlg = "sha1";
//  The salt should be 8 bytes:
string saltHex;
saltHex = "78578E5A5D63CB06";
int iterationCount;
iterationCount = 1000;
//  Derive a 128-bit key from the password.
int outputBitLen;
outputBitLen = 128;

//  The derived key is returned as a hex or base64 encoded string.
//  (Note: The salt argument must be a string that also uses
//  the same encoding.)
string enc;
enc = "hex";

hexKey = crypt.Pbkdf1(pw,pwCharset,hashAlg,saltHex,iterationCount,outputBitLen,enc);

textBox1.Text += hexKey + "\r\n";

//  The output should have this value:
//  DC19847E05C64D2FAF10EBFB4A3D2A20

 

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