Example usage for javax.crypto Cipher getOutputSize

Introduction

In this page you can find the example usage for javax.crypto Cipher getOutputSize.

Prototype

public final int getOutputSize(int inputLen) 

Source Link

Document

Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes).

Usage

From source file:org.apache.niolex.commons.codec.CipherUtil.java

/**
 * For some kind of cipher, e.g. RSA, can not handle bytes larger than a fixed block size.
 * So, this method is just for this kind of cipher to handle large bytes.
 *
 * @param cipher//from   ww  w  . j  a va  2  s  . c o  m
 * @param blockSize
 * @param input
 * @return the processed bytes
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws ShortBufferException
 */
public static byte[] process(Cipher cipher, int blockSize, byte[] input)
        throws IllegalBlockSizeException, BadPaddingException, ShortBufferException {
    if (input.length <= blockSize) {
        return cipher.doFinal(input);
    }
    final int OUTPUT_SIZE = (input.length + blockSize - 1) / blockSize * cipher.getOutputSize(blockSize);

    byte[] output = new byte[OUTPUT_SIZE];
    int outputIndex = 0;
    for (int i = 0;; i += blockSize) {
        if (i + blockSize < input.length)
            outputIndex += cipher.doFinal(input, i, blockSize, output, outputIndex);
        else {
            outputIndex += cipher.doFinal(input, i, input.length - i, output, outputIndex);
            break;
        }
    }
    if (outputIndex != OUTPUT_SIZE)
        return ArrayUtils.subarray(output, 0, outputIndex);
    return output;
}

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From source file:net.firejack.platform.web.security.x509.KeyUtils.java

public static byte[] decrypt(PrivateKey key, byte[] bytes) throws Exception {
    byte[] result = new byte[0];

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.DECRYPT_MODE, key);
    int length = cipher.getOutputSize(bytes.length);

    for (int i = 0; i < bytes.length; i += length) {
        byte[] bytes1 = cipher.doFinal(bytes, i, Math.min(bytes.length - i, length));
        result = ArrayUtils.addAll(result, bytes1);
    }/*from  w w  w .  j av  a 2s .  c o m*/

    return result;
}

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From source file:net.firejack.platform.web.security.x509.KeyUtils.java

public static byte[] encrypt(PublicKey key, byte[] bytes) throws Exception {
    byte[] result = new byte[0];

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    int length = cipher.getOutputSize(bytes.length) - 11;
    for (int i = 0; i < bytes.length; i += length) {
        byte[] buffer = cipher.doFinal(bytes, i, Math.min(bytes.length - i, length));
        result = ArrayUtils.addAll(result, buffer);
    }//from   w ww .j ava2  s  .co  m

    return result;
}

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From source file:Main.java

public static byte[] encryptMsg(String msg, RSAPublicKeySpec pubKeySpec) {
    if (msg != null && pubKeySpec != null && !msg.isEmpty()) {
        try {/*from   w w w.  ja  va2  s. com*/
            Log.w(TAG, "msg is: " + msg + " with length " + msg.length());
            KeyFactory fact = KeyFactory.getInstance("RSA");

            PublicKey pubKey = fact.generatePublic(pubKeySpec);

            // TODO encrypt the message and send it
            // Cipher cipher = Cipher.getInstance("RSA/None/NoPadding");
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            // Cipher cipher =
            // Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding",
            // "BC");
            cipher.init(Cipher.ENCRYPT_MODE, pubKey);
            Log.d(TAG, "cipher block size is " + cipher.getBlockSize());
            byte[] msgByteArray = msg.getBytes();
            byte[] cipherData = new byte[cipher.getOutputSize(msgByteArray.length)];
            cipherData = cipher.doFinal(msgByteArray);
            Log.d(TAG, "output size is " + cipher.getOutputSize(msgByteArray.length));
            Log.d(TAG, "is the measurement already broken into chunks here? " + (new String(cipherData)));
            return cipherData;

        } catch (NoSuchAlgorithmException e) {
            Log.e(TAG, "RSA algorithm not available", e);
        } catch (InvalidKeySpecException e) {
            Log.e(TAG, "", e);
        } catch (NoSuchPaddingException e) {
            Log.e(TAG, "", e);
        } catch (InvalidKeyException e) {
            Log.e(TAG, "", e);
        } catch (BadPaddingException e) {
            Log.e(TAG, "", e);
        } catch (IllegalBlockSizeException e) {
            Log.e(TAG, "", e);
        } catch (Exception e) {
            Log.e(TAG, "", e);
        } /*
           * catch (NoSuchProviderException e) { Log.e(TAG, "", e); }
           */
    }
    return null;
}

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From source file:hjow.hgtable.util.SecurityUtil.java

/**
 * <p>? ?  ?? ? .</p>// www. jav a  2 s  . c  om
 * 
 * @param text : ? ?
 * @param key : ? ? 
 * @param algorithm : ? ?   (null  AES  )
 * @return ?? ?
 */
public static String decrypt(String text, String key, String algorithm) {
    try {
        String passwords = hash(key, null);
        String methods = algorithm;
        if (methods == null)
            methods = "AES";

        String paddings;
        int need_keySize = -1;
        boolean useIv = false;

        byte[] befores = text.getBytes("UTF-8");
        byte[] keyByte = passwords.getBytes("UTF-8");

        if (methods.equalsIgnoreCase("DES")) {
            paddings = "DES/CBC/PKCS5Padding";
            need_keySize = 8;
            useIv = true;
        } else if (methods.equalsIgnoreCase("DESede")) {
            paddings = "TripleDES/ECB/PKCS5Padding";
            need_keySize = 168;
            useIv = true;
        } else if (methods.equalsIgnoreCase("AES")) {
            paddings = "AES";
            need_keySize = 16;
            useIv = false;
        } else
            return null;

        befores = Base64.decodeBase64(befores);

        byte[] checkKeyByte = new byte[need_keySize];
        byte[] ivBytes = new byte[checkKeyByte.length];
        for (int i = 0; i < checkKeyByte.length; i++) {
            if (i < keyByte.length) {
                checkKeyByte[i] = keyByte[i];
            } else {
                checkKeyByte[i] = 0;
            }
        }
        keyByte = checkKeyByte;

        SecretKeySpec keySpec = new SecretKeySpec(keyByte, methods);
        IvParameterSpec ivSpec = null;
        if (useIv)
            ivSpec = new IvParameterSpec(ivBytes);

        Cipher cipher = null;

        try {
            cipher = Cipher.getInstance(paddings);
            if (useIv) {
                cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
            } else {
                cipher.init(Cipher.DECRYPT_MODE, keySpec);
            }
            byte[] outputs = new byte[cipher.getOutputSize(befores.length)];
            for (int i = 0; i < outputs.length; i++) {
                outputs[i] = 0;
            }
            int enc_len = cipher.update(befores, 0, befores.length, outputs, 0);
            enc_len = enc_len + cipher.doFinal(outputs, enc_len);

            return new String(outputs, "UTF-8").trim();
        } catch (Throwable e) {
            Main.logError(e, Manager.applyStringTable("On decryption"));
            return text;
        }
    } catch (Throwable e) {

    }
    return null;
}

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From source file:hjow.hgtable.util.SecurityUtil.java

/**
 * <p>? .</p>//  w  w w. ja va 2s  .c  om
 * 
 * @param text : ?? ? ?
 * @param key : ? ? 
 * @param algorithm :   (null  AES )
 * @return ? ?
 */
public static String encrypt(String text, String key, String algorithm) {
    try {
        String passwords = hash(key, null);
        String methods = algorithm;
        if (methods == null)
            methods = "AES";

        String paddings;
        int need_keySize = -1;
        boolean useIv = false;

        byte[] befores = text.trim().getBytes("UTF-8");
        byte[] keyByte = passwords.getBytes("UTF-8");

        if (methods.equalsIgnoreCase("DES")) {
            paddings = "DES/CBC/PKCS5Padding";
            need_keySize = 8;
            useIv = true;
        } else if (methods.equalsIgnoreCase("DESede")) {
            paddings = "TripleDES/ECB/PKCS5Padding";
            need_keySize = 24;
            useIv = true;
        } else if (methods.equalsIgnoreCase("AES")) {
            paddings = "AES";
            need_keySize = 16;
            useIv = false;
        } else
            return null;

        byte[] checkKeyByte = new byte[need_keySize];
        byte[] ivBytes = new byte[checkKeyByte.length];

        for (int i = 0; i < checkKeyByte.length; i++) {
            if (i < keyByte.length) {
                checkKeyByte[i] = keyByte[i];
            } else {
                checkKeyByte[i] = 0;
            }
        }
        keyByte = checkKeyByte;

        SecretKeySpec keySpec = new SecretKeySpec(keyByte, algorithm);
        IvParameterSpec ivSpec = null;
        if (useIv)
            ivSpec = new IvParameterSpec(ivBytes);

        Cipher cipher = null;
        byte[] outputs;

        try {
            cipher = Cipher.getInstance(paddings);
            if (useIv) {
                cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
            } else {
                cipher.init(Cipher.ENCRYPT_MODE, keySpec);
            }

            outputs = new byte[cipher.getOutputSize(befores.length)];
            for (int i = 0; i < outputs.length; i++) {
                outputs[i] = 0;
            }
            int enc_len = cipher.update(befores, 0, befores.length, outputs, 0);
            enc_len = enc_len + cipher.doFinal(outputs, enc_len);

            return new String(Base64.encodeBase64(outputs), "UTF-8");
        } catch (Throwable e) {
            Main.logError(e, Manager.applyStringTable("On encrypting"));
            return null;
        }
    } catch (Throwable e) {

    }
    return null;
}

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From source file:com.forsrc.utils.MyRsa2Utils.java

/**
 * Encrypt string.//  w  ww  .  ja  va2  s. c  o  m
 *
 * @param publicKey the public key
 * @param plaintext the plaintext
 * @return the string
 * @throws RsaException the rsa exception
 */
public static String encrypt(PublicKey publicKey, String plaintext) throws RsaException {
    Cipher cipher = null;
    try {
        cipher = Cipher.getInstance(RsaKey.ALGORITHM, new org.bouncycastle.jce.provider.BouncyCastleProvider());
    } catch (NoSuchAlgorithmException e) {
        throw new RsaException(e);
    } catch (NoSuchPaddingException e) {
        throw new RsaException(e);
    }
    try {
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    } catch (InvalidKeyException e) {
        throw new RsaException(e);
    }
    byte[] data = plaintext.getBytes();
    int blockSize = cipher.getBlockSize();
    blockSize = blockSize == 0 ? 117 : blockSize;
    int outputSize = cipher.getOutputSize(data.length);
    int count = (int) Math.ceil(data.length / blockSize) + 1;

    byte[] output = new byte[outputSize * count];
    try {

        int i = 0;
        int start = 0;
        int outputStart = 0;
        do {
            start = i * blockSize;
            outputStart = i * outputSize;
            if (data.length - start >= blockSize) {
                cipher.doFinal(data, start, blockSize, output, outputStart);
            } else {
                cipher.doFinal(data, start, data.length - start, output, outputStart);
            }
            i++;
        } while (data.length - start - blockSize >= 0);

    } catch (IllegalBlockSizeException e) {
        throw new RsaException(e);
    } catch (BadPaddingException e) {
        throw new RsaException(e);
    } catch (ShortBufferException e) {
        throw new RsaException(e);
    }
    return new String(new Base64().encode(output));
}

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From source file:cn.usually.common.pay.union.sdk.SecureUtil.java

/**
 * ???byte[]/*ww  w .j  a va 2s .com*/
 * 
 * @param publicKey
 * @param plainPin
 * @return
 * @throws Exception
 */
public static byte[] encryptedPin(PublicKey publicKey, byte[] plainPin) throws Exception {
    try {
        // y
        // Cipher cipher = Cipher.getInstance("DES",
        // new org.bouncycastle.jce.provider.BouncyCastleProvider());

        // 
        Cipher cipher = CliperInstance.getInstance();
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(plainPin.length);
        int leavedSize = plainPin.length % blockSize;
        int blocksSize = leavedSize != 0 ? plainPin.length / blockSize + 1 : plainPin.length / blockSize;
        byte[] raw = new byte[outputSize * blocksSize];
        int i = 0;
        while (plainPin.length - i * blockSize > 0) {
            if (plainPin.length - i * blockSize > blockSize) {
                cipher.doFinal(plainPin, i * blockSize, blockSize, raw, i * outputSize);
            } else {
                cipher.doFinal(plainPin, i * blockSize, plainPin.length - i * blockSize, raw, i * outputSize);
            }
            i++;
        }
        return raw;
    } catch (Exception e) {
        throw new Exception(e.getMessage());
    }
}

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From source file:unionpayUtil.sdk.SecureUtil.java

/**
 * ???byte[]//from  ww  w  .ja  v  a2 s .  co m
 * 
 * @param publicKey
 * @param plainPin
 * @return
 * @throws Exception
 */
public static byte[] encryptedPin(PublicKey publicKey, byte[] plainPin) throws Exception {
    try {
        // y
        // Cipher cipher = Cipher.getInstance("DES",
        // new org.bouncycastle.jce.provider.BouncyCastleProvider());

        // ?
        Cipher cipher = CliperInstance.getInstance();
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(plainPin.length);
        int leavedSize = plainPin.length % blockSize;
        int blocksSize = leavedSize != 0 ? plainPin.length / blockSize + 1 : plainPin.length / blockSize;
        byte[] raw = new byte[outputSize * blocksSize];
        int i = 0;
        while (plainPin.length - i * blockSize > 0) {
            if (plainPin.length - i * blockSize > blockSize) {
                cipher.doFinal(plainPin, i * blockSize, blockSize, raw, i * outputSize);
            } else {
                cipher.doFinal(plainPin, i * blockSize, plainPin.length - i * blockSize, raw, i * outputSize);
            }
            i++;
        }
        return raw;
    } catch (Exception e) {
        throw new Exception(e.getMessage());
    }
}

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From source file:cn.usually.common.pay.union.sdknew.SecureUtil.java

/**
 * ???byte[]//w  ww.ja  v a  2s  .co  m
 * 
 * @param publicKey
 * @param plainPin
 * @return
 * @throws Exception
 */
public static byte[] encryptedPin(PublicKey publicKey, byte[] plainPin) throws Exception {
    try {
        // y
        // Cipher cipher = Cipher.getInstance("DES",
        // new org.bouncycastle.jce.provider.BouncyCastleProvider());

        // 
        Cipher cipher = CliperInstance.getInstance();
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        int blockSize = cipher.getBlockSize();
        int outputSize = cipher.getOutputSize(plainPin.length);
        int leavedSize = plainPin.length % blockSize;
        int blocksSize = leavedSize != 0 ? plainPin.length / blockSize + 1 : plainPin.length / blockSize;
        byte[] raw = new byte[outputSize * blocksSize];
        int i = 0;
        while (plainPin.length - i * blockSize > 0) {
            if (plainPin.length - i * blockSize > blockSize) {
                cipher.doFinal(plainPin, i * blockSize, blockSize, raw, i * outputSize);
            } else {
                cipher.doFinal(plainPin, i * blockSize, plainPin.length - i * blockSize, raw, i * outputSize);
            }
            i++;
        }
        return raw;

        /*Cipher cipher = CliperInstance.getInstance();
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] output = cipher.doFinal(plainPin);
        return output;*/

    } catch (Exception e) {
        throw new Exception(e.getMessage());
    }
}

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