Example usage for org.bouncycastle.crypto.digests SHA256Digest update

Introduction

In this page you can find the example usage for org.bouncycastle.crypto.digests SHA256Digest update.

Prototype

public void update(byte[] in, int inOff, int len) 

Source Link

Usage

From source file:de.tsenger.animamea.crypto.KeyDerivationFunction.java

License:Open Source License

/**
 * Erzeugt AES-256 Schlssel//from  w  ww .  j a  v a2  s .c o m
 * 
 * @return Schlssel als Byte-Array
 */
public byte[] getAES256Key() {

    byte[] checksum = new byte[32];

    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(mergedData, 0, mergedData.length);
    sha256.doFinal(checksum, 0);

    return checksum;
}

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From source file:dorkbox.util.HashUtil.java

License:Apache License

/**
 * gets the SHA256 hash + SALT of the specified username, as UTF-16
 *//*from  ww w  .  j a  v  a 2  s.  co  m*/
public static byte[] getSha256WithSalt(String username, byte[] saltBytes) {
    if (username == null) {
        return null;
    }

    byte[] charToBytes = Sys.charToBytes16(username.toCharArray());
    byte[] userNameWithSalt = Sys.concatBytes(charToBytes, saltBytes);

    SHA256Digest sha256 = new SHA256Digest();
    byte[] usernameHashBytes = new byte[sha256.getDigestSize()];
    sha256.update(userNameWithSalt, 0, userNameWithSalt.length);
    sha256.doFinal(usernameHashBytes, 0);

    return usernameHashBytes;
}

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From source file:dorkbox.util.HashUtil.java

License:Apache License

/**
 * gets the SHA256 hash of the specified string, as UTF-16
 *///from  ww w.ja  v a  2s  .  c  o m
public static byte[] getSha256(String string) {
    byte[] charToBytes = Sys.charToBytes16(string.toCharArray());

    SHA256Digest sha256 = new SHA256Digest();
    byte[] usernameHashBytes = new byte[sha256.getDigestSize()];
    sha256.update(charToBytes, 0, charToBytes.length);
    sha256.doFinal(usernameHashBytes, 0);

    return usernameHashBytes;
}

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From source file:dorkbox.util.HashUtil.java

License:Apache License

/**
 * gets the SHA256 hash of the specified byte array
 *//*from   w  w  w. java  2s  . com*/
public static byte[] getSha256(byte[] bytes) {

    SHA256Digest sha256 = new SHA256Digest();
    byte[] hashBytes = new byte[sha256.getDigestSize()];
    sha256.update(bytes, 0, bytes.length);
    sha256.doFinal(hashBytes, 0);

    return hashBytes;
}

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From source file:dorkbox.util.HashUtil.java

License:Apache License

public static byte[] getSha256WithSalt(byte[] bytes, byte[] saltBytes) {
    if (bytes == null || saltBytes == null) {
        return null;
    }/*w  ww  . j a  v a2  s  . c o m*/

    byte[] bytesWithSalt = dorkbox.util.Sys.concatBytes(bytes, saltBytes);

    SHA256Digest sha256 = new SHA256Digest();
    byte[] usernameHashBytes = new byte[sha256.getDigestSize()];
    sha256.update(bytesWithSalt, 0, bytesWithSalt.length);
    sha256.doFinal(usernameHashBytes, 0);

    return usernameHashBytes;
}

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From source file:dorkbox.util.Sys.java

License:Apache License

/**
 * gets the SHA256 hash + SALT of the specified username, as UTF-16
 *//*www .j a  va2s.  c o  m*/
public static byte[] getSha256WithSalt(String username, byte[] saltBytes) {
    if (username == null) {
        return null;
    }

    byte[] charToBytes = Sys.charToBytes(username.toCharArray());
    byte[] userNameWithSalt = Sys.concatBytes(charToBytes, saltBytes);

    SHA256Digest sha256 = new SHA256Digest();
    byte[] usernameHashBytes = new byte[sha256.getDigestSize()];
    sha256.update(userNameWithSalt, 0, userNameWithSalt.length);
    sha256.doFinal(usernameHashBytes, 0);

    return usernameHashBytes;
}

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From source file:dorkbox.util.Sys.java

License:Apache License

/**
 * gets the SHA256 hash of the specified string, as UTF-16
 *///  w w  w .  j a v  a2s  .c  o m
public static byte[] getSha256(String string) {
    byte[] charToBytes = Sys.charToBytes(string.toCharArray());

    SHA256Digest sha256 = new SHA256Digest();
    byte[] usernameHashBytes = new byte[sha256.getDigestSize()];
    sha256.update(charToBytes, 0, charToBytes.length);
    sha256.doFinal(usernameHashBytes, 0);

    return usernameHashBytes;
}

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From source file:freemail.HashSlotManager.java

License:Open Source License

@Override
protected String incSlot(String slot) {
    byte[] buf = Base32.decode(slot);
    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(buf, 0, buf.length);
    sha256.doFinal(buf, 0);// w  w  w.  j a  v  a 2  s . co  m

    return Base32.encode(buf);
}

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From source file:freemail.OutboundContact.java

License:Open Source License

/**
 * Set up an outbound contact. Fetch the mailsite, generate a new SSK keypair and post an RTS message to the appropriate KSK.
 * Will block for mailsite retrieval and RTS insertion
 *
 * @return true for success//from  www  . ja  va2s  .  c  o m
 */
private boolean init() throws ConnectionTerminatedException, InterruptedException {
    Logger.normal(this, "Initialising Outbound Contact " + address.toString());

    // try to fetch get all necessary info. will fetch mailsite / generate new keys if necessary
    String initialslot = this.getCurrentLowestSlot();
    SSKKeyPair commssk = this.getCommKeyPair();
    if (commssk == null)
        return false;
    SSKKeyPair ackssk = this.getAckKeyPair();
    RSAKeyParameters their_pub_key = this.getPubKey();
    if (their_pub_key == null)
        return false;
    String rtsksk = this.getRtsKsk();
    if (rtsksk == null)
        return false;

    StringBuffer rtsmessage = new StringBuffer();

    // the public part of the SSK keypair we generated
    rtsmessage.append("commssk=" + commssk.pubkey + "\r\n");

    rtsmessage.append("ackssk=" + ackssk.privkey + "\r\n");

    rtsmessage.append("initialslot=" + initialslot + "\r\n");

    rtsmessage.append("messagetype=rts\r\n");

    // must include who this RTS is to, otherwise we're vulnerable to surreptitious forwarding
    rtsmessage.append("to=" + this.address.getSubDomain() + "\r\n");

    // get our mailsite URI
    String our_mailsite_uri = account.getProps().get("mailsite.pubkey");

    rtsmessage.append("mailsite=" + our_mailsite_uri + "\r\n");

    rtsmessage.append("\r\n");
    //FreemailLogger.normal(this,rtsmessage.toString());

    // sign the message
    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(rtsmessage.toString().getBytes(), 0, rtsmessage.toString().getBytes().length);
    byte[] hash = new byte[sha256.getDigestSize()];
    sha256.doFinal(hash, 0);

    RSAKeyParameters our_priv_key = AccountManager.getPrivateKey(account.getProps());

    AsymmetricBlockCipher sigcipher = new RSAEngine();
    sigcipher.init(true, our_priv_key);
    byte[] sig = null;
    try {
        sig = sigcipher.processBlock(hash, 0, hash.length);
    } catch (InvalidCipherTextException icte) {
        Logger.error(this, "Failed to RSA encrypt hash: " + icte.getMessage());
        icte.printStackTrace();
        return false;
    }

    ByteArrayOutputStream bos = new ByteArrayOutputStream();

    try {
        bos.write(rtsmessage.toString().getBytes());
        bos.write(sig);
    } catch (IOException ioe) {
        ioe.printStackTrace();
        return false;
    }

    // make up a symmetric key
    PaddedBufferedBlockCipher aescipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            new PKCS7Padding());

    // quick paranoia check!
    if (aescipher.getBlockSize() != AES_BLOCK_LENGTH) {
        // bouncycastle must have changed their implementation, so 
        // we're in trouble
        Logger.normal(this,
                "Incompatible block size change detected in cryptography API! Are you using a newer version of the bouncycastle libraries? If so, we suggest you downgrade for now, or check for a newer version of Freemail.");
        return false;
    }

    byte[] aes_iv_and_key = this.getAESParams();

    // now encrypt that with our recipient's public key
    AsymmetricBlockCipher enccipher = new RSAEngine();
    enccipher.init(true, their_pub_key);
    byte[] encrypted_aes_params = null;
    try {
        encrypted_aes_params = enccipher.processBlock(aes_iv_and_key, 0, aes_iv_and_key.length);
    } catch (InvalidCipherTextException icte) {
        Logger.error(this,
                "Failed to perform asymmertic encryption on RTS symmetric key: " + icte.getMessage());
        icte.printStackTrace();
        return false;
    }

    // now encrypt the message with the symmetric key
    KeyParameter kp = new KeyParameter(aes_iv_and_key, aescipher.getBlockSize(), AES_KEY_LENGTH);
    ParametersWithIV kpiv = new ParametersWithIV(kp, aes_iv_and_key, 0, aescipher.getBlockSize());
    aescipher.init(true, kpiv);

    byte[] encmsg = new byte[aescipher.getOutputSize(bos.toByteArray().length) + encrypted_aes_params.length];
    System.arraycopy(encrypted_aes_params, 0, encmsg, 0, encrypted_aes_params.length);
    int offset = encrypted_aes_params.length;
    offset += aescipher.processBytes(bos.toByteArray(), 0, bos.toByteArray().length, encmsg, offset);

    try {
        aescipher.doFinal(encmsg, offset);
    } catch (InvalidCipherTextException icte) {
        Logger.error(this, "Failed to perform symmertic encryption on RTS data: " + icte.getMessage());
        icte.printStackTrace();
        return false;
    }

    // insert it!
    HighLevelFCPClient cli = new HighLevelFCPClient();
    if (cli.slotInsert(encmsg, "KSK@" + rtsksk + "-" + DateStringFactory.getKeyString(), 1, "") < 0) {
        // safe to copy the message into the contact outbox though
        return false;
    }

    // remember the fact that we have successfully inserted the rts
    this.contactfile.put("status", "rts-sent");
    // and remember when we sent it!
    this.contactfile.put("rts-sent-at", Long.toString(System.currentTimeMillis()));
    // and since that's been successfully inserted to that key, we can
    // throw away the symmetric key
    this.contactfile.remove("aesparams");

    Logger.normal(this, "Succesfully initialised Outbound Contact");

    return true;
}

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From source file:freemail.OutboundContact.java

License:Open Source License

private String popNextSlot() {
    String slot = this.contactfile.get("nextslot");
    if (slot == null) {
        return generateFirstSlot();
    }// www.  j  a  v a 2 s .  c o m
    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(Base32.decode(slot), 0, Base32.decode(slot).length);
    byte[] nextslot = new byte[sha256.getDigestSize()];
    sha256.doFinal(nextslot, 0);
    this.contactfile.put("nextslot", Base32.encode(nextslot));

    return slot;
}

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