Example usage for javax.crypto CipherInputStream read

Introduction

In this page you can find the example usage for javax.crypto CipherInputStream read.

Prototype

public int read(byte b[]) throws IOException 

Source Link

Document

Reads up to b.length bytes of data from this input stream into an array of bytes.

Usage

From source file:Main.java

public static void decrypt(String fileIn, String fileOut, byte key[])
        throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    FileInputStream fis = new FileInputStream(fileIn);
    FileOutputStream fos = new FileOutputStream(fileOut);

    // Length is 32 bytes
    //byte key[] = "1010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100000011010110101010101010100101111001001001001001001011110111100001111000011".getBytes("UTF-8");
    MessageDigest sha = MessageDigest.getInstance("SHA-256");
    key = sha.digest(key);//from w w  w  . j a  va2s. c om
    SecretKeySpec sks = new SecretKeySpec(key, "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, sks);

    CipherInputStream cis = new CipherInputStream(fis, cipher);
    int b;
    byte[] d = new byte[8];
    while ((b = cis.read(d)) != -1) {
        fos.write(d, 0, b);
    }

    fos.flush();
    fos.close();
    cis.close();
}

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From source file:Main.java

private static boolean handleFile(int mode, byte[] key, byte[] iv, String sourceFilePath, String destFilePath) {

    File sourceFile = new File(sourceFilePath);
    File destFile = new File(destFilePath);

    try {//w  ww  .  jav a  2  s .  co  m
        if (sourceFile.exists() && sourceFile.isFile()) {
            if (!destFile.getParentFile().exists())
                destFile.getParentFile().mkdirs();
            destFile.createNewFile();

            InputStream in = new FileInputStream(sourceFile);
            OutputStream out = new FileOutputStream(destFile);
            Cipher cipher = initCipher(mode, key, iv, AES_CFB_NOPADDING);
            CipherInputStream cin = new CipherInputStream(in, cipher);

            byte[] b = new byte[1024];
            int read = 0;
            while ((read = cin.read(b)) != -1) {
                out.write(b, 0, read);
                out.flush();
            }

            cin.close();
            in.close();
            out.close();

            return true;
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

    return false;
}

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From source file:MainClass.java

static void applyCipher(String inFile, String outFile, Cipher cipher) throws Exception {
    CipherInputStream in = new CipherInputStream(new FileInputStream(inFile), cipher);
    BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(outFile));
    int BUFFER_SIZE = 8;
    byte[] buffer = new byte[BUFFER_SIZE];
    int numRead = 0;
    do {//from   ww w.j  a v  a2  s.c o  m
        numRead = in.read(buffer);
        if (numRead > 0)
            out.write(buffer, 0, numRead);
    } while (numRead == 8);
}

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From source file:org.panbox.core.crypto.CryptCore.java

public static SecretKey decryptShareKey(ShareKeyDBEntry entry, PublicKey pubKey, PrivateKey privKey) {
    SecretKey result = null;//from   w w  w . j  ava  2 s . c om
    if (entry != null) {
        byte[] encSK = entry.getEncryptedKey(pubKey);
        byte[] sk = new byte[KeyConstants.SYMMETRIC_BLOCK_SIZE];
        try {
            ASYMM_CIPHER.init(Cipher.DECRYPT_MODE, privKey);
            ByteArrayInputStream bis = new ByteArrayInputStream(encSK);
            CipherInputStream cis = new CipherInputStream(bis, ASYMM_CIPHER);
            cis.read(sk);
            cis.close();
            bis.close();
            result = new SecretKeySpec(sk, entry.getAlgorithm());
        } catch (InvalidKeyException e) {
            logger.warn("Exception caught in CryptCore.decryptShareKey", e);
        } catch (IOException e) {
            logger.warn("Exception caught in CryptCore.decryptShareKey", e);
        }
    }
    return result;
}

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From source file:com.dc.util.file.FileSupport.java

private static void copyEncryptedStream(InputStream input, OutputStream output, String key)
        throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    Cipher dcipher = Cipher.getInstance("AES");
    CipherInputStream cis = null;
    try {/*from  w  w w .j  a  va2 s.c  o m*/
        dcipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key.getBytes(), "AES"));
        cis = new CipherInputStream(input, dcipher);
        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = cis.read(buffer)) != -1) {
            output.write(buffer, 0, bytesRead);
        }
        output.flush();
    } finally {
        if (cis != null) {
            cis.close();
        }
    }
}

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From source file:enc_mods.aes.java

/**
* Decrypts an AES key from a file using an RSA private key
*///  w ww .ja  v  a2  s  .  c o  m
public void loadKey(File in, File privateKeyFile) {
    try {
        // read private key to be used to decrypt the AES key
        byte[] encodedKey = new byte[(int) privateKeyFile.length()];
        new FileInputStream(privateKeyFile).read(encodedKey);

        // create private key
        PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedKey);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        PrivateKey pk = kf.generatePrivate(privateKeySpec);

        // read AES key
        cipher.init(Cipher.DECRYPT_MODE, pk);
        key = new byte[AES_Key_Size / 8];
        CipherInputStream is = new CipherInputStream(new FileInputStream(in), cipher);
        is.read(key);
        secretkey = new SecretKeySpec(key, "AES");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:sec_algo.commonenc.java

/**
* Decrypts an AES key from a file using an RSA private key
*///w w  w  . ja va2s.  com
public void loadKey(File in, File privateKeyFile) {
    try {
        // read private key to be used to decrypt the AES key
        byte[] encodedKey = new byte[(int) privateKeyFile.length()];
        new FileInputStream(privateKeyFile).read(encodedKey);

        // create private key
        PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(encodedKey);
        KeyFactory kf = KeyFactory.getInstance("RSA");
        PrivateKey pk = kf.generatePrivate(privateKeySpec);

        // read AES key
        pkCipher.init(Cipher.DECRYPT_MODE, pk);
        key = new byte[AES_Key_Size / 8];
        CipherInputStream is = new CipherInputStream(new FileInputStream(in), pkCipher);
        is.read(key);
        secretkey = new SecretKeySpec(key, "AES");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:com.cubusmail.server.mail.security.MailPasswordEncryptor.java

public String decryptPassword(byte[] encryptedPassword) {

    Cipher cipher;//from w  w w .j a  v  a 2s.c o  m
    try {
        log.debug("decrypt...");
        cipher = Cipher.getInstance(this.algorithm);
        cipher.init(Cipher.DECRYPT_MODE, this.keyPair.getPrivate());

        CipherInputStream cis = new CipherInputStream(new ByteArrayInputStream(encryptedPassword), cipher);
        ByteArrayOutputStream baosDecryptedData = new ByteArrayOutputStream();
        byte[] buffer = new byte[8192];
        int len = 0;
        while ((len = cis.read(buffer)) > 0) {
            baosDecryptedData.write(buffer, 0, len);
        }
        baosDecryptedData.flush();
        cis.close();

        log.debug("...finish");

        return new String(baosDecryptedData.toByteArray());
    } catch (Exception e) {
        log.error(e.getMessage(), e);
        throw new IllegalStateException(e.getMessage(), e);
    }
}

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From source file:org.linagora.linshare.core.utils.SymmetricEnciphermentPBEwithAES.java

public void decryptStream() throws IOException {

    if (cipherMode != Cipher.DECRYPT_MODE)
        throw new IllegalStateException("can not call decrypt, check cipher mode");

    CipherInputStream cis = new CipherInputStream(in, cipher);

    // Read from encrypted input and write to output stream
    byte[] buffer = new byte[2048];
    int bytesRead;

    while ((bytesRead = cis.read(buffer)) != -1) {
        out.write(buffer, 0, bytesRead);
        //System.out.println(bytesRead);
    }/*from   w  ww  .java  2 s .com*/

    out.flush();
    out.close();
    cis.close();
    in.close();

}

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From source file:Crypto.java

/**
 * Read from the encrypted file (input) and turn the cipher back into cleartext. Write the cleartext buffer back out
 * to disk as (output) File.//www. j  a  v  a2 s  .  c  om
 * 
 * I left CipherInputStream in here as a test to see if I could mix it with the update() and final() methods of encrypting
 *  and still have a correctly decrypted file in the end. Seems to work so left it in.
 *  
 * @param input - File object representing encrypted data on disk 
 * @param output - File object of cleartext data to write out after decrypting
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws IOException
 */
public void ReadEncryptedFile(File input, File output)
        throws IllegalBlockSizeException, BadPaddingException, IOException {
    FileInputStream fin;
    FileOutputStream fout;
    CipherInputStream cin;
    long totalread = 0;
    int nread = 0;
    byte[] inbuf = new byte[MAX_FILE_BUF];

    fout = new FileOutputStream(output);
    fin = new FileInputStream(input);

    // creating a decoding stream from the FileInputStream above using the cipher created from setupDecrypt()
    cin = new CipherInputStream(fin, mDecipher);

    while ((nread = cin.read(inbuf)) > 0) {
        Db("read " + nread + " bytes");
        totalread += nread;

        // create a buffer to write with the exact number of bytes read. Otherwise a short read fills inbuf with 0x0
        byte[] trimbuf = new byte[nread];
        for (int i = 0; i < nread; i++)
            trimbuf[i] = inbuf[i];

        // write out the size-adjusted buffer
        fout.write(trimbuf);
    }

    fout.flush();
    cin.close();
    fin.close();
    fout.close();

    Db("wrote " + totalread + " encrypted bytes");
}

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