Example usage for javax.crypto CipherInputStream CipherInputStream

Introduction

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

Prototype

public CipherInputStream(InputStream is, Cipher c) 

Source Link

Document

Constructs a CipherInputStream from an InputStream and a Cipher.

Usage

From source file:org.cryptomator.crypto.aes256.Aes256Cryptor.java

@Override
public Long decryptedFile(SeekableByteChannel encryptedFile, OutputStream plaintextFile) throws IOException {
    // read iv://from   ww  w.  ja  va2s.  com
    encryptedFile.position(0);
    final ByteBuffer countingIv = ByteBuffer.allocate(AES_BLOCK_LENGTH);
    final int numIvBytesRead = encryptedFile.read(countingIv);

    // read file size:
    final Long fileSize = decryptedContentLength(encryptedFile);

    // check validity of header:
    if (numIvBytesRead != AES_BLOCK_LENGTH || fileSize == null) {
        throw new IOException("Failed to read file header.");
    }

    // go to begin of content:
    encryptedFile.position(64);

    // generate cipher:
    final Cipher cipher = this.aesCtrCipher(primaryMasterKey, countingIv.array(), Cipher.DECRYPT_MODE);

    // read content
    final InputStream in = new SeekableByteChannelInputStream(encryptedFile);
    final InputStream cipheredIn = new CipherInputStream(in, cipher);
    return IOUtils.copyLarge(cipheredIn, plaintextFile, 0, fileSize);
}

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From source file:org.cryptomator.crypto.aes256.Aes256Cryptor.java

@Override
public Long decryptRange(SeekableByteChannel encryptedFile, OutputStream plaintextFile, long pos, long length)
        throws IOException {
    // read iv:/*ww  w  . ja  v a 2s . c om*/
    encryptedFile.position(0);
    final ByteBuffer countingIv = ByteBuffer.allocate(AES_BLOCK_LENGTH);
    final int numIvBytesRead = encryptedFile.read(countingIv);

    // check validity of header:
    if (numIvBytesRead != AES_BLOCK_LENGTH) {
        throw new IOException("Failed to read file header.");
    }

    // seek relevant position and update iv:
    long firstRelevantBlock = pos / AES_BLOCK_LENGTH; // cut of fraction!
    long beginOfFirstRelevantBlock = firstRelevantBlock * AES_BLOCK_LENGTH;
    long offsetInsideFirstRelevantBlock = pos - beginOfFirstRelevantBlock;
    countingIv.putLong(AES_BLOCK_LENGTH - Long.BYTES, firstRelevantBlock);

    // fast forward stream:
    encryptedFile.position(64 + beginOfFirstRelevantBlock);

    // generate cipher:
    final Cipher cipher = this.aesCtrCipher(primaryMasterKey, countingIv.array(), Cipher.DECRYPT_MODE);

    // read content
    final InputStream in = new SeekableByteChannelInputStream(encryptedFile);
    final InputStream cipheredIn = new CipherInputStream(in, cipher);
    return IOUtils.copyLarge(cipheredIn, plaintextFile, offsetInsideFirstRelevantBlock, length);
}

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From source file:net.tawacentral.roger.secrets.FileUtils.java

/**
 * Read the secrets from the given input stream, decrypting with the given
 * cipher. This uses the old object format and exists for compatibility.
 *
 * @param input The input stream to read the secrets from.
 * @param cipher The cipher to decrypt the secrets with.
 * @return The secrets read from the stream.
 * @throws IOException//from   ww  w.  j  a va 2s . c  o m
 * @throws ClassNotFoundException
 */
@SuppressWarnings("unchecked")
private static ArrayList<Secret> readSecretsV2(InputStream input, Cipher cipher, byte[] salt, int rounds)
        throws IOException, ClassNotFoundException {
    SaltAndRounds pair = getSaltAndRounds(input);
    if (!Arrays.equals(pair.salt, salt) || pair.rounds != rounds) {
        return null;
    }
    ObjectInputStream oin = new ObjectInputStream(new CipherInputStream(input, cipher));
    try {
        return (ArrayList<Secret>) oin.readObject();
    } finally {
        try {
            if (null != oin)
                oin.close();
        } catch (IOException ex) {
        }
    }
}

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From source file:pt.lunacloud.services.storage.internal.crypto.EncryptionUtils.java

/**
 * Returns an input stream encrypted with the given symmetric cipher.
 *//*from  ww  w.j  ava2s.  com*/
private static InputStream getEncryptedInputStream(PutObjectRequest request, Cipher symmetricCipher) {
    try {
        InputStream originalInputStream = request.getInputStream();
        if (request.getFile() != null) {
            originalInputStream = new RepeatableFileInputStream(request.getFile());
        }
        return new CipherInputStream(originalInputStream, symmetricCipher);
    } catch (Exception e) {
        throw new LunacloudClientException("Unable to create cipher input stream: " + e.getMessage(), e);
    }
}

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From source file:pt.lunacloud.services.storage.internal.crypto.EncryptionUtils.java

public static InputStream getEncryptedInputStream(UploadPartRequest request, Cipher symmetricCipher) {
    try {// w w  w .  j  a  v  a2 s  .  c o m
        InputStream originalInputStream = request.getInputStream();
        if (request.getFile() != null) {
            originalInputStream = new InputSubstream(new RepeatableFileInputStream(request.getFile()),
                    request.getFileOffset(), request.getPartSize(), request.isLastPart());
        }

        originalInputStream = new CipherInputStream(originalInputStream, symmetricCipher);

        if (request.isLastPart() == false) {
            // We want to prevent the final padding from being sent on the stream...
            originalInputStream = new InputSubstream(originalInputStream, 0, request.getPartSize(), false);
        }

        long partSize = request.getPartSize();
        int cipherBlockSize = symmetricCipher.getBlockSize();
        return new ByteRangeCapturingInputStream(originalInputStream, partSize - cipherBlockSize, partSize);
    } catch (Exception e) {
        throw new LunacloudClientException("Unable to create cipher input stream: " + e.getMessage(), e);
    }
}

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From source file:com.pari.nm.utils.backup.BackupRestore.java

public boolean decrypt(File backupZipFile, File encrZipFile) throws Exception {
    try {//w  ww.  j a v a2 s. c  om
        FileOutputStream fout = new FileOutputStream(backupZipFile);
        FileInputStream fin = new FileInputStream(encrZipFile);
        Cipher cipher = Cipher.getInstance("DESEDE");

        cipher.init(Cipher.DECRYPT_MODE, getDefaultKey());

        CipherInputStream cin = new CipherInputStream(fin, cipher);
        byte[] buffer = new byte[8192];

        try {
            int read = cin.read(buffer);
            while (read != -1) {
                fout.write(buffer, 0, read);
                read = cin.read(buffer);
            }
        } finally {
            try {
                fout.close();
            } catch (Exception ignore) {
            }

            try {
                cin.close();
            } catch (Exception ignore) {
            }

            try {
                fin.close();
            } catch (Exception ignore) {
            }
        }
        return true;
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return false;
}

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From source file:com.datatorrent.lib.io.fs.AbstractFileOutputOperatorTest.java

private void checkCompressedFile(File file, List<Long> offsets, int startVal, int totalWindows,
        int totalRecords, SecretKey secretKey, byte[] iv) throws IOException {
    FileInputStream fis;/*from w ww .  j a v a 2 s  .  c  o m*/
    InputStream gss = null;
    GZIPInputStream gis = null;
    BufferedReader br = null;

    Cipher cipher = null;
    if (secretKey != null) {
        try {
            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            IvParameterSpec ivps = new IvParameterSpec(iv);
            cipher.init(Cipher.DECRYPT_MODE, secretKey, ivps);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    int numWindows = 0;
    try {
        fis = new FileInputStream(file);
        //fis.skip(startOffset);
        gss = fis;
        if (secretKey != null) {
            try {
                /*
                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
                IvParameterSpec ivps = new IvParameterSpec(iv);
                cipher.init(Cipher.DECRYPT_MODE, secretKey, ivps);
                */
                gss = new CipherInputStream(fis, cipher);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

        long startOffset = 0;
        for (long offset : offsets) {
            // Skip initial case in case file is not yet created
            if (offset == 0) {
                continue;
            }
            long limit = offset - startOffset;
            LimitInputStream lis = new LimitInputStream(gss, limit);

            //gis = new GZIPInputStream(fis);
            gis = new GZIPInputStream(lis);
            br = new BufferedReader(new InputStreamReader(gis));
            //br = new BufferedReader(new InputStreamReader(gss));
            String eline = "" + (startVal + numWindows * 2);
            int count = 0;
            String line;
            while ((line = br.readLine()) != null) {
                Assert.assertEquals("File line", eline, line);
                ++count;
                if ((count % totalRecords) == 0) {
                    ++numWindows;
                    eline = "" + (startVal + numWindows * 2);
                }
            }
            startOffset = offset;
        }
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (br != null) {
            br.close();
        } else {
            if (gis != null) {
                gis.close();
            } else if (gss != null) {
                gss.close();
            }
        }
    }
    Assert.assertEquals("Total", totalWindows, numWindows);
}

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