Example usage for org.bouncycastle.crypto AsymmetricBlockCipher getInputBlockSize

Introduction

In this page you can find the example usage for org.bouncycastle.crypto AsymmetricBlockCipher getInputBlockSize.

Prototype

public int getInputBlockSize();

Source Link

Document

returns the largest size an input block can be.

Usage

From source file:com.geoxp.oss.CryptoHelper.java

License:Apache License

/**
 * Encrypt data using RSA.// w w  w  .j a  va2  s  .c  o  m
 * CAUTION: this can take a while on large data
 * 
 * @param key RSA key to use for encryption
 * @param data Cleartext data
 * @return The ciphertext data or null if an error occured
 */
public static byte[] encryptRSA(Key key, byte[] data) {
    //
    // Get an RSA Cipher instance
    //
    //Cipher rsa = null;

    try {
        /* The following commented code can be used the BouncyCastle
         * JCE provider signature is intact, which is not the
         * case when BC has been repackaged using jarjar
        rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
        rsa.init (Cipher.ENCRYPT_MODE, key, CryptoHelper.sr);                   
        return rsa.doFinal(data);
        */
        AsymmetricBlockCipher c = new PKCS1Encoding(new RSABlindedEngine());
        if (key instanceof RSAPublicKey) {
            c.init(true, new RSAKeyParameters(true, ((RSAPublicKey) key).getModulus(),
                    ((RSAPublicKey) key).getPublicExponent()));
        } else if (key instanceof RSAPrivateKey) {
            c.init(true, new RSAKeyParameters(true, ((RSAPrivateKey) key).getModulus(),
                    ((RSAPrivateKey) key).getPrivateExponent()));
        } else {
            return null;
        }

        int insize = c.getInputBlockSize();

        int offset = 0;

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        while (offset < data.length) {
            int len = Math.min(insize, data.length - offset);
            baos.write(c.processBlock(data, offset, len));
            offset += len;
        }

        return baos.toByteArray();

        /*
            } catch (NoSuchProviderException nspe) {
              return null;
            } catch (NoSuchPaddingException nspe) {
              return null;
            } catch (NoSuchAlgorithmException nsae) {
              return null;
            } catch (InvalidKeyException ike) {
              return null;
            } catch (BadPaddingException bpe) {
              return null;
            } catch (IllegalBlockSizeException ibse) {
              return null;
            }
        */
    } catch (InvalidCipherTextException icte) {
        return null;
    } catch (IOException ioe) {
        return null;
    }
}

---

From source file:com.geoxp.oss.CryptoHelper.java

License:Apache License

/**
 * Decrypt data previously encrypted with RSA
 * @param key RSA key to use for decryption
 * @param data Ciphertext data//from   ww  w  .j  av  a 2 s .  c om
 * @return The cleartext data or null if an error occurred
 */
public static byte[] decryptRSA(Key key, byte[] data) {
    //
    // Get an RSA Cipher instance
    //

    //Cipher rsa = null;

    try {
        /* The following commented code can be used the BouncyCastle
         * JCE provider signature is intact, which is not the
         * case when BC has been repackaged using jarjar
        rsa = Cipher.getInstance("RSA/ECB/PKCS1Padding", "BC");
        rsa.init (Cipher.DECRYPT_MODE, key, CryptoHelper.sr);
        return rsa.doFinal(data);
        */

        AsymmetricBlockCipher c = new PKCS1Encoding(new RSABlindedEngine());
        if (key instanceof RSAPublicKey) {
            c.init(false, new RSAKeyParameters(true, ((RSAPublicKey) key).getModulus(),
                    ((RSAPublicKey) key).getPublicExponent()));
        } else if (key instanceof RSAPrivateKey) {
            c.init(false, new RSAKeyParameters(true, ((RSAPrivateKey) key).getModulus(),
                    ((RSAPrivateKey) key).getPrivateExponent()));
        } else {
            return null;
        }

        int insize = c.getInputBlockSize();

        int offset = 0;

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        while (offset < data.length) {
            int len = Math.min(insize, data.length - offset);
            baos.write(c.processBlock(data, offset, len));
            offset += len;
        }

        return baos.toByteArray();

        /*
            } catch (NoSuchProviderException nspe) {
              return null;
            } catch (NoSuchPaddingException nspe) {
              return null;
            } catch (NoSuchAlgorithmException nsae) {
              return null;
            } catch (InvalidKeyException ike) {
              return null;
            } catch (BadPaddingException bpe) {
              return null;
            } catch (IllegalBlockSizeException ibse) {
              return null;
            }
        */
    } catch (InvalidCipherTextException icte) {
        return null;
    } catch (IOException ioe) {
        return null;
    }
}

---

From source file:com.maiereni.util.EncryptedFileLoader.java

License:Apache License

/**
 * Encrypt and encode //from  w w w  .  j  a va2 s.  c o m
 * @param buffer
 * @return
 * @throws Exception
 */
protected byte[] encryptRSA(final byte[] buffer) throws Exception {
    try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
        AsymmetricBlockCipher cipher = getAsymmetricBlockCipher(true);
        int len = cipher.getInputBlockSize();
        for (int i = 0; i < buffer.length; i += len) {
            if (i + len > buffer.length)
                len = buffer.length - i;

            byte[] encrypted = cipher.processBlock(buffer, i, len);
            out.write(encrypted);
        }
        return out.toByteArray();
    }
}

---

From source file:com.maiereni.util.EncryptedFileLoader.java

License:Apache License

protected byte[] decryptRSA(final byte[] buffer) throws Exception {
    try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
        AsymmetricBlockCipher cipher = getAsymmetricBlockCipher(false);
        int len = cipher.getInputBlockSize();
        for (int i = 0; i < buffer.length; i += len) {
            if (i + len > buffer.length) {
                len = buffer.length - i;
            }/*from   w  w w  .  j a  va  2  s  .  c  o  m*/

            byte[] decrypted = cipher.processBlock(buffer, i, len);
            out.write(decrypted);
        }
        return out.toByteArray();
    }
}

---

From source file:dorkbox.util.crypto.CryptoRSA.java

License:Apache License

/**
 * RSA encrypts data with a specified key.
 *
 * @param logger/*from w w w .  ja  v a 2s.  c o  m*/
 *                 may be null, if no log output is necessary
 *
 * @return empty byte[] if error
 */
public static byte[] encrypt(AsymmetricBlockCipher rsaEngine, RSAKeyParameters rsaPublicKey, byte[] bytes,
        Logger logger) {
    rsaEngine.init(true, rsaPublicKey);

    try {
        int inputBlockSize = rsaEngine.getInputBlockSize();
        if (inputBlockSize < bytes.length) {
            int outSize = rsaEngine.getOutputBlockSize();
            //noinspection NumericCastThatLosesPrecision
            int realsize = (int) Math.round(bytes.length / (outSize * 1.0D) + 0.5);
            ByteBuffer buffer = ByteBuffer.allocateDirect(outSize * realsize);

            int position = 0;

            while (position < bytes.length) {
                int size = Math.min(inputBlockSize, bytes.length - position);

                byte[] block = rsaEngine.processBlock(bytes, position, size);
                buffer.put(block, 0, block.length);

                position += size;
            }

            return buffer.array();

        } else {
            return rsaEngine.processBlock(bytes, 0, bytes.length);
        }
    } catch (Exception e) {
        if (logger != null) {
            logger.error("Unable to perform RSA cipher.", e);
        }
        return new byte[0];
    }
}

---

From source file:dorkbox.util.crypto.CryptoRSA.java

License:Apache License

/**
 * RSA decrypt data with a specified key.
 *
 * @param logger// w  w w.  jav a  2 s  .  co m
 *                 may be null, if no log output is necessary
 *
 * @return empty byte[] if error
 */
public static byte[] decrypt(AsymmetricBlockCipher rsaEngine, RSAPrivateCrtKeyParameters rsaPrivateKey,
        byte[] bytes, Logger logger) {
    rsaEngine.init(false, rsaPrivateKey);

    try {
        int inputBlockSize = rsaEngine.getInputBlockSize();
        if (inputBlockSize < bytes.length) {
            int outSize = rsaEngine.getOutputBlockSize();
            //noinspection NumericCastThatLosesPrecision
            int realsize = (int) Math.round(bytes.length / (outSize * 1.0D) + 0.5);
            ByteArrayOutputStream buffer = new ByteArrayOutputStream(outSize * realsize);

            int position = 0;

            while (position < bytes.length) {
                int size = Math.min(inputBlockSize, bytes.length - position);

                byte[] block = rsaEngine.processBlock(bytes, position, size);
                buffer.write(block, 0, block.length);

                position += size;
            }

            return buffer.toByteArray();
        } else {
            return rsaEngine.processBlock(bytes, 0, bytes.length);
        }
    } catch (Exception e) {
        if (logger != null) {
            logger.error("Unable to perform RSA cipher.", e);
        }
        return new byte[0];
    }
}

---

From source file:freemail.RTSFetcher.java

License:Open Source License

private boolean handle_rts(File rtsmessage) throws ConnectionTerminatedException, InterruptedException {
    // sanity check!
    if (!rtsmessage.exists())
        return false;

    if (rtsmessage.length() > RTS_MAX_SIZE) {
        Logger.normal(this, "RTS Message is too large - discarding!");
        return true;
    }/*  www. jav a  2  s .  c o  m*/

    // decrypt
    byte[] plaintext;
    try {
        plaintext = decrypt_rts(rtsmessage);
    } catch (IOException ioe) {
        Logger.normal(this, "Error reading RTS message!");
        return false;
    } catch (InvalidCipherTextException icte) {
        Logger.normal(this, "Could not decrypt RTS message - discarding." + icte.getMessage());
        return true;
    }

    File rtsfile = null;
    byte[] their_encrypted_sig;
    int messagebytes = 0;
    try {
        rtsfile = File.createTempFile("rtstmp", "tmp", Freemail.getTempDir());

        ByteArrayInputStream bis = new ByteArrayInputStream(plaintext);
        LineReadingInputStream lis = new LineReadingInputStream(bis);
        PrintStream ps = new PrintStream(new FileOutputStream(rtsfile));

        String line;
        while (true) {
            try {
                line = lis.readLine(200, 200, false);
            } catch (TooLongException tle) {
                Logger.normal(this, "RTS message has lines that are too long. Discarding.");
                rtsfile.delete();
                return true;
            }
            messagebytes += lis.getLastBytesRead();

            if (line == null || line.equals(""))
                break;
            //FreemailLogger.normal(this,line);

            ps.println(line);
        }

        ps.close();

        if (line == null) {
            // that's not right, we shouldn't have reached the end of the file, just the blank line before the signature

            Logger.normal(this, "Couldn't find signature on RTS message - ignoring!");
            rtsfile.delete();
            return true;
        }

        // read the rest of the file into a byte array.
        // will probably have extra stuff on the end because
        // the byte array returned by the decrypt function
        // isn't resized when we know how much plaintext
        // there is. It would be a waste of time, we know
        // we have to read exactly one RSA block's worth.
        their_encrypted_sig = new byte[bis.available()];

        int totalread = 0;
        while (true) {
            int read = bis.read(their_encrypted_sig, totalread, bis.available());
            if (read <= 0)
                break;
            totalread += read;
        }

        bis.close();
    } catch (IOException ioe) {
        Logger.normal(this, "IO error whilst handling RTS message. " + ioe.getMessage());
        ioe.printStackTrace();
        if (rtsfile != null)
            rtsfile.delete();
        return false;
    }

    PropsFile rtsprops = PropsFile.createPropsFile(rtsfile);

    try {
        validate_rts(rtsprops);
    } catch (Exception e) {
        Logger.normal(this,
                "RTS message does not contain vital information: " + e.getMessage() + " - discarding");
        rtsfile.delete();
        return true;
    }

    // verify the signature
    String their_mailsite_raw = rtsprops.get("mailsite");

    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(plaintext, 0, messagebytes);
    byte[] our_hash = new byte[sha256.getDigestSize()];
    sha256.doFinal(our_hash, 0);

    HighLevelFCPClient fcpcli = new HighLevelFCPClient();

    FreenetURI their_mailsite_furi;
    try {
        their_mailsite_furi = new FreenetURI(their_mailsite_raw);
    } catch (MalformedURLException mfue) {
        Logger.normal(this, "Mailsite in the RTS message is not a valid Freenet URI. Discarding RTS message.");
        rtsfile.delete();
        return true;
    }

    String their_mailsite = "USK@" + their_mailsite_furi.getKeyBody() + "/" + their_mailsite_furi.getSuffix();

    if (!their_mailsite.endsWith("/")) {
        their_mailsite += "/";
    }
    their_mailsite += AccountManager.MAILSITE_VERSION + "/" + MailSite.MAILPAGE;

    Logger.normal(this, "Trying to fetch sender's mailsite: " + their_mailsite);
    File msfile;
    try {
        msfile = fcpcli.fetch(their_mailsite);
    } catch (FCPFetchException fe) {
        // oh well, try again in a bit
        rtsfile.delete();
        return false;
    } catch (FCPException e) {
        Logger.error(this, "Unknown error while checking sender's mailsite: " + e);

        //Try again later
        rtsfile.delete();
        return false;
    }

    PropsFile mailsite = PropsFile.createPropsFile(msfile);
    String their_exponent = mailsite.get("asymkey.pubexponent");
    String their_modulus = mailsite.get("asymkey.modulus");

    if (their_exponent == null || their_modulus == null) {
        Logger.normal(this,
                "Mailsite fetched successfully but missing vital information! Discarding this RTS.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    RSAKeyParameters their_pubkey = new RSAKeyParameters(false, new BigInteger(their_modulus, 32),
            new BigInteger(their_exponent, 32));
    AsymmetricBlockCipher deccipher = new RSAEngine();
    deccipher.init(false, their_pubkey);

    byte[] their_hash;
    try {
        their_hash = deccipher.processBlock(their_encrypted_sig, 0, deccipher.getInputBlockSize());
    } catch (InvalidCipherTextException icte) {
        Logger.normal(this,
                "It was not possible to decrypt the signature of this RTS message. Discarding the RTS message.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    // finally we can now check that our hash and their hash
    // match!
    if (their_hash.length < our_hash.length) {
        Logger.normal(this, "The signature of the RTS message is not valid (our hash: " + our_hash.length
                + "bytes, their hash: " + their_hash.length + "bytes. Discarding the RTS message.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }
    int i;
    for (i = 0; i < our_hash.length; i++) {
        if (their_hash[i] != our_hash[i]) {
            Logger.normal(this, "The signature of the RTS message is not valid. Discarding the RTS message.");
            msfile.delete();
            rtsfile.delete();
            return true;
        }
    }
    Logger.normal(this, "Signature valid :)");
    // the signature is valid! Hooray!
    // Now verify the message is for us
    String our_mailsite_keybody;
    try {
        our_mailsite_keybody = new FreenetURI(account.getProps().get("mailsite.pubkey")).getKeyBody();
    } catch (MalformedURLException mfue) {
        Logger.normal(this, "Local mailsite URI is invalid! Corrupt account file?");
        msfile.delete();
        rtsfile.delete();
        return false;
    }

    String our_domain_alias = account.getProps().get("domain_alias");
    FreenetURI mailsite_furi;
    try {
        mailsite_furi = new FreenetURI(our_mailsite_keybody);
    } catch (MalformedURLException mfe) {
        msfile.delete();
        rtsfile.delete();
        return false;
    }
    String our_subdomain = Base32.encode(mailsite_furi.getKeyBody().getBytes());

    if (!rtsprops.get("to").equalsIgnoreCase(our_subdomain) && our_domain_alias != null
            && !rtsprops.get("to").equals(our_domain_alias)) {
        Logger.normal(this, "Recieved an RTS message that was not intended for the recipient. Discarding.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    Logger.normal(this, "Original message intended for us :)");

    // create the inbound contact
    InboundContact ibct = new InboundContact(this.contact_dir, their_mailsite_furi);

    ibct.setProp("commssk", rtsprops.get("commssk"));
    String ackssk = rtsprops.get("ackssk");
    if (!ackssk.endsWith("/"))
        ackssk += "/";
    ibct.setProp("ackssk", ackssk);
    ibct.setProp("slots", rtsprops.get("initialslot"));

    // insert the cts at some point
    AckProcrastinator.put(ackssk + "cts");

    msfile.delete();
    rtsfile.delete();

    Logger.normal(this, "Inbound contact created!");

    return true;
}

---

From source file:freemail.RTSFetcher.java

License:Open Source License

private byte[] decrypt_rts(File rtsmessage) throws IOException, InvalidCipherTextException {
    // initialise our ciphers
    RSAKeyParameters ourprivkey = AccountManager.getPrivateKey(account.getProps());
    AsymmetricBlockCipher deccipher = new RSAEngine();
    deccipher.init(false, ourprivkey);//from   w w  w .j  ava 2s  .  c  o m

    PaddedBufferedBlockCipher aescipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            new PKCS7Padding());

    // first n bytes will be an encrypted RSA block containting the
    // AES IV and Key. Read that.
    byte[] encrypted_params = new byte[deccipher.getInputBlockSize()];
    FileInputStream fis = new FileInputStream(rtsmessage);
    int read = 0;

    while (read < encrypted_params.length) {
        read += fis.read(encrypted_params, read, encrypted_params.length - read);
        if (read < 0)
            break;
    }

    if (read < 0) {
        throw new InvalidCipherTextException("RTS Message too short");
    }

    byte[] aes_iv_and_key = deccipher.processBlock(encrypted_params, 0, encrypted_params.length);

    KeyParameter kp = new KeyParameter(aes_iv_and_key, aescipher.getBlockSize(),
            aes_iv_and_key.length - aescipher.getBlockSize());
    ParametersWithIV kpiv = new ParametersWithIV(kp, aes_iv_and_key, 0, aescipher.getBlockSize());
    try {
        aescipher.init(false, kpiv);
    } catch (IllegalArgumentException iae) {
        throw new InvalidCipherTextException(iae.getMessage());
    }

    byte[] plaintext = new byte[aescipher.getOutputSize((int) rtsmessage.length() - read)];

    int ptbytes = 0;
    while (read < rtsmessage.length()) {
        byte[] buf = new byte[(int) rtsmessage.length() - read];

        int thisread = fis.read(buf, 0, (int) rtsmessage.length() - read);
        ptbytes += aescipher.processBytes(buf, 0, thisread, plaintext, ptbytes);
        read += thisread;
    }

    fis.close();

    try {
        aescipher.doFinal(plaintext, ptbytes);
    } catch (DataLengthException dle) {
        throw new InvalidCipherTextException(dle.getMessage());
    }

    return plaintext;
}

---

From source file:org.freenetproject.freemail.RTSFetcher.java

License:Open Source License

private boolean handle_rts(File rtsmessage) throws ConnectionTerminatedException, InterruptedException {
    // sanity check!
    if (!rtsmessage.exists())
        return false;

    if (rtsmessage.length() > RTS_MAX_SIZE) {
        Logger.normal(this, "RTS Message is too large - discarding!");
        return true;
    }/* w  ww. ja va2s  .  c  o m*/

    // decrypt
    byte[] plaintext;
    try {
        plaintext = decrypt_rts(rtsmessage);
    } catch (IOException ioe) {
        Logger.normal(this, "Error reading RTS message!");
        return false;
    } catch (InvalidCipherTextException icte) {
        Logger.normal(this, "Could not decrypt RTS message - discarding. " + icte.getMessage());
        return true;
    }

    File rtsfile = null;
    byte[] their_encrypted_sig;
    int messagebytes = 0;
    LineReadingInputStream lis = null;
    PrintStream ps = null;
    try {
        rtsfile = File.createTempFile("rtstmp", "tmp", Freemail.getTempDir());

        ByteArrayInputStream bis = new ByteArrayInputStream(plaintext);
        lis = new LineReadingInputStream(bis);
        ps = new PrintStream(new FileOutputStream(rtsfile));

        String line;
        while (true) {
            try {
                line = lis.readLine(200, 200, false);
            } catch (TooLongException tle) {
                Logger.normal(this, "RTS message has lines that are too long. Discarding.");
                rtsfile.delete();
                return true;
            }
            messagebytes += lis.getLastBytesRead();

            if (line == null || line.equals(""))
                break;
            //FreemailLogger.normal(this, line);

            ps.println(line);
        }

        if (line == null) {
            // that's not right, we shouldn't have reached the end of the file, just the blank line before the signature

            Logger.normal(this, "Couldn't find signature on RTS message - ignoring!");
            rtsfile.delete();
            return true;
        }

        // read the rest of the file into a byte array.
        // will probably have extra stuff on the end because
        // the byte array returned by the decrypt function
        // isn't resized when we know how much plaintext
        // there is. It would be a waste of time, we know
        // we have to read exactly one RSA block's worth.
        their_encrypted_sig = new byte[bis.available()];

        int totalread = 0;
        while (true) {
            int read = bis.read(their_encrypted_sig, totalread, bis.available());
            if (read <= 0)
                break;
            totalread += read;
        }
    } catch (IOException ioe) {
        Logger.normal(this, "IO error whilst handling RTS message. " + ioe.getMessage());
        ioe.printStackTrace();
        if (rtsfile != null)
            rtsfile.delete();
        return false;
    } finally {
        if (ps != null) {
            ps.close();
        }
        if (lis != null) {
            try {
                lis.close();
            } catch (IOException e) {
                Logger.error(this, "Caugth IOException while closing input", e);
            }
        }
    }

    PropsFile rtsprops = PropsFile.createPropsFile(rtsfile);

    try {
        validate_rts(rtsprops);
    } catch (Exception e) {
        Logger.normal(this,
                "RTS message does not contain vital information: " + e.getMessage() + " - discarding");
        rtsfile.delete();
        return true;
    }

    // verify the signature
    String their_mailsite = rtsprops.get("mailsite");

    SHA256Digest sha256 = new SHA256Digest();
    sha256.update(plaintext, 0, messagebytes);
    byte[] our_hash = new byte[sha256.getDigestSize()];
    sha256.doFinal(our_hash, 0);

    HighLevelFCPClient fcpcli = new HighLevelFCPClient();

    Logger.normal(this, "Trying to fetch sender's mailsite: " + their_mailsite);
    File msfile;
    try {
        msfile = fcpcli.fetch(their_mailsite);
    } catch (FCPFetchException fe) {
        // oh well, try again in a bit
        rtsfile.delete();
        return false;
    } catch (FCPException e) {
        Logger.error(this, "Unknown error while checking sender's mailsite: " + e.getMessage());

        //Try again later
        rtsfile.delete();
        return false;
    }

    PropsFile mailsite = PropsFile.createPropsFile(msfile);
    String their_exponent = mailsite.get("asymkey.pubexponent");
    String their_modulus = mailsite.get("asymkey.modulus");

    if (their_exponent == null || their_modulus == null) {
        Logger.normal(this,
                "Mailsite fetched successfully but missing vital information! Discarding this RTS.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    RSAKeyParameters their_pubkey = new RSAKeyParameters(false, new BigInteger(their_modulus, 32),
            new BigInteger(their_exponent, 32));
    AsymmetricBlockCipher deccipher = new RSAEngine();
    deccipher.init(false, their_pubkey);

    byte[] their_hash;
    try {
        their_hash = deccipher.processBlock(their_encrypted_sig, 0, deccipher.getInputBlockSize());
    } catch (InvalidCipherTextException icte) {
        Logger.normal(this,
                "It was not possible to decrypt the signature of this RTS message. Discarding the RTS message.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    // finally we can now check that our hash and their hash
    // match!
    if (their_hash.length < our_hash.length) {
        Logger.normal(this, "The signature of the RTS message is not valid (our hash: " + our_hash.length
                + "bytes, their hash: " + their_hash.length + "bytes. Discarding the RTS message.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }
    int i;
    for (i = 0; i < our_hash.length; i++) {
        if (their_hash[i] != our_hash[i]) {
            Logger.normal(this, "The signature of the RTS message is not valid. Discarding the RTS message.");
            msfile.delete();
            rtsfile.delete();
            return true;
        }
    }
    Logger.normal(this, "Signature valid :)");
    // the signature is valid! Hooray!
    // Now verify the message is for us
    if (!account.getIdentity().equals(rtsprops.get("to"))) {
        Logger.normal(this, "Recieved an RTS message that was not intended for the recipient. Discarding.");
        msfile.delete();
        rtsfile.delete();
        return true;
    }

    Logger.normal(this, "Original message intended for us :)");

    //Clean up temp files
    if (!msfile.delete()) {
        Logger.error(this, "Couldn't delete fetched mailsite: " + msfile);
    }
    if (!rtsfile.delete()) {
        Logger.error(this, "Couldn't delete rts file: " + rtsfile);
    }

    account.getMessageHandler().createChannelFromRTS(rtsprops);

    return true;
}

---

From source file:org.freenetproject.freemail.RTSFetcher.java

License:Open Source License

private byte[] decrypt_rts(File rtsmessage) throws IOException, InvalidCipherTextException {
    // initialise our ciphers
    RSAKeyParameters ourprivkey = AccountManager.getPrivateKey(account.getProps());
    AsymmetricBlockCipher deccipher = new RSAEngine();
    deccipher.init(false, ourprivkey);//w w  w . j a v a2 s.  c  o m

    PaddedBufferedBlockCipher aescipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new AESEngine()),
            new PKCS7Padding());

    // first n bytes will be an encrypted RSA block containting the
    // AES IV and Key. Read that.
    byte[] encrypted_params = new byte[deccipher.getInputBlockSize()];
    int read = 0;
    FileInputStream fis = new FileInputStream(rtsmessage);
    try {
        while (read < encrypted_params.length) {
            read += fis.read(encrypted_params, read, encrypted_params.length - read);
            if (read < 0)
                break;
        }

        if (read < 0) {
            fis.close();
            throw new InvalidCipherTextException("RTS Message too short");
        }

        byte[] aes_iv_and_key = deccipher.processBlock(encrypted_params, 0, encrypted_params.length);

        KeyParameter kp = new KeyParameter(aes_iv_and_key, aescipher.getBlockSize(),
                aes_iv_and_key.length - aescipher.getBlockSize());
        ParametersWithIV kpiv = new ParametersWithIV(kp, aes_iv_and_key, 0, aescipher.getBlockSize());
        try {
            aescipher.init(false, kpiv);
        } catch (IllegalArgumentException iae) {
            fis.close();
            throw new InvalidCipherTextException(iae.getMessage());
        }

        byte[] plaintext = new byte[aescipher.getOutputSize((int) rtsmessage.length() - read)];

        int ptbytes = 0;
        while (read < rtsmessage.length()) {
            byte[] buf = new byte[(int) rtsmessage.length() - read];

            int thisread = fis.read(buf, 0, (int) rtsmessage.length() - read);
            ptbytes += aescipher.processBytes(buf, 0, thisread, plaintext, ptbytes);
            read += thisread;
        }

        try {
            aescipher.doFinal(plaintext, ptbytes);
        } catch (DataLengthException dle) {
            throw new InvalidCipherTextException(dle.getMessage());
        }

        return plaintext;
    } finally {
        fis.close();
    }
}

---

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