Example usage for org.bouncycastle.crypto.engines DESEngine processBlock

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.engines DESEngine processBlock.

Prototype

public int processBlock(byte[] in, int inOff, byte[] out, int outOff) 

Source Link

Usage

From source file:org.alfresco.jlan.client.J2MEPasswordEncryptor.java

License:Open Source License

/**
 * P16 encryption/*from w  w w.  ja va 2 s.c  o m*/
 *
 * @param pwd java.lang.String
 * @param s8 byte[]
 * @return byte[]
* @exception NoSuchAlgorithmException   If a required encryption algorithm is not available
 */
public final byte[] P16(String pwd, byte[] s8) throws NoSuchAlgorithmException {

    //   Make a 14 byte string using the password string. Truncate the
    //   password or pad with nulls to 14 characters.

    StringBuffer p14str = new StringBuffer();
    p14str.append(pwd.toUpperCase());
    if (p14str.length() > 14)
        p14str.setLength(14);

    while (p14str.length() < 14)
        p14str.append((char) 0x00);

    //   Convert the P14 string to an array of bytes. Allocate the return 16 byte array.

    byte[] p14 = p14str.toString().getBytes();
    byte[] p16 = new byte[16];

    try {

        //   DES encrypt the password bytes using the challenge key

        DESEngine des = new DESEngine();

        //   Set the encryption seed using the first 7 bytes of the password string.
        //   Generate the first 8 bytes of the return value.

        byte[] key = generateKey(p14, 0);

        KeyParameter chKey = new KeyParameter(key);
        des.init(true, chKey);
        des.processBlock(s8, 0, p16, 0);

        //   Encrypt the second block

        key = generateKey(p14, 7);

        chKey = new KeyParameter(key);
        des.init(true, chKey);
        des.processBlock(s8, 0, p16, 8);
    } catch (Exception ex) {
        p16 = null;
    }

    //   Return the 16 byte encrypted value

    return p16;
}

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From source file:org.alfresco.jlan.client.J2MEPasswordEncryptor.java

License:Open Source License

/**
 * P24 DES encryption//from ww w  .ja  v  a2s.  c  o  m
 *
 * @param p21      Plain password or hashed password bytes
 * @param ch      Challenge bytes
 * @return         Encrypted password
 * @exception NoSuchAlgorithmException   If a required encryption algorithm is not available
 */
protected byte[] P24(byte[] p21, byte[] ch) throws NoSuchAlgorithmException {

    byte[] enc = null;

    try {

        //   DES encrypt the password bytes using the challenge key

        DESEngine des = new DESEngine();

        //   Allocate the output bytes

        enc = new byte[24];

        //   Encrypt the first block

        byte[] key = generateKey(p21, 0);

        KeyParameter chKey = new KeyParameter(key);
        des.init(true, chKey);
        des.processBlock(ch, 0, enc, 0);

        //   Encrypt the second block

        key = generateKey(p21, 7);

        chKey = new KeyParameter(key);
        des.init(true, chKey);
        des.processBlock(ch, 0, enc, 8);

        //   Encrypt the last block

        key = generateKey(p21, 14);

        chKey = new KeyParameter(key);
        des.init(true, chKey);
        des.processBlock(ch, 0, enc, 16);
    } catch (Exception ex) {
        ex.printStackTrace();
        enc = null;
    }

    //   Return the encrypted password, or null if an error occurred

    return enc;
}

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