Example usage for javax.crypto Cipher DECRYPT

Introduction

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

Prototype

int DECRYPT_MODE

To view the source code for javax.crypto Cipher DECRYPT_MODE.

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Document

Constant used to initialize cipher to decryption mode.

Usage

From source file:com.AES256Util.java

public String aesDecode(String str) throws java.io.UnsupportedEncodingException, NoSuchAlgorithmException,

        NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,

        IllegalBlockSizeException, BadPaddingException {

    Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");

    c.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv.getBytes("UTF-8")));

    byte[] byteStr = Base64.decodeBase64(str.getBytes());

    return new String(c.doFinal(byteStr), "UTF-8");

}

From source file:by.bsuir.chujko.model.entities.security.StringCrypter.java

/**
 * To update secret key.//  ww  w. j  ava  2s .  co m
 * 
 * @param key
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException 
 */
private void updateSecretKey(SecretKey key)
        throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
    ecipher = Cipher.getInstance(key.getAlgorithm());
    dcipher = Cipher.getInstance(key.getAlgorithm());
    ecipher.init(Cipher.ENCRYPT_MODE, key);
    dcipher.init(Cipher.DECRYPT_MODE, key);
}

From source file:gov.nih.nci.cadsr.cadsrpasswordchange.core.OracleObfuscation.java

public byte[] decrypt(byte[] bytes) throws GeneralSecurityException {
    cipher.init(Cipher.DECRYPT_MODE, key, iv); // normally you could leave
    // out the IvParameterSpec
    // argument, but not with
    // Oracle/*w  w  w  . j a  v  a  2s .c om*/

    return cipher.doFinal(bytes);
}

From source file:com.feedzai.commons.sql.abstraction.util.AESHelper.java

/**
 * Decrypts a byte[] encrypted by {@link #encrypt} method.
 *
 * @param c   The encrypted HEX byte[].//w w  w.jav a  2 s .  c  o m
 * @param key The key.
 * @return The decrypted string in a byte[].
 */
public static byte[] decrypt(byte[] c, String key) {
    try {
        SecretKeySpec skeySpec = new SecretKeySpec(Hex.decodeHex(key.toCharArray()), "AES");
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
        return cipher.doFinal(Hex.decodeHex((new String(c).toCharArray())));
    } catch (Exception e) {
        logger.warn("Could not decrypt byte[]", e);
        return null;
    }
}

From source file:br.com.manish.ahy.kernel.util.HashUtil.java

private static Cipher getCipher(boolean enc)
        throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128);/*  w  ww  . ja v  a  2s .  c o m*/
    SecretKeySpec skeySpec = new SecretKeySpec(getBytes(HEXES2), "AES");
    Cipher cipher = Cipher.getInstance("AES");
    if (enc) {
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    } else {
        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
    }
    return cipher;
}

From source file:com.bconomy.autobit.Encryption.java

public static byte[] decrypt(byte[] cyphertext, byte[] key) {
    if (keySpec == null)
        keySpec = new SecretKeySpec(key, "AES");
    Cipher aes;/*from  www  . ja va2s  . c  om*/
    try {
        aes = Cipher.getInstance("AES/ECB/PKCS5Padding");
        aes.init(Cipher.DECRYPT_MODE, keySpec);
        return aes.doFinal(cyphertext);
    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException
            | BadPaddingException ex) {
        ex.printStackTrace();
    }
    return new byte[0];
}

From source file:com.tremolosecurity.proxy.filters.RetreiveIdToken.java

@Override
public void doFilter(HttpFilterRequest request, HttpFilterResponse response, HttpFilterChain chain)
        throws Exception {
    HashMap<String, OpenIDConnectIdP> idps = (HashMap<String, OpenIDConnectIdP>) GlobalEntries
            .getGlobalEntries().get(OpenIDConnectIdP.UNISON_OPENIDCONNECT_IDPS);

    OpenIDConnectIdP idp = idps.get(this.idpName);
    if (idp == null) {
        throw new ServletException("Could not find idp '" + this.idpName + "'");
    }/*from  w ww. j a  va  2 s .  c  o  m*/
    Gson gson = new Gson();
    String json = this.inflate(request.getParameter("refresh_token").getValues().get(0));
    Token token = gson.fromJson(json, Token.class);

    byte[] iv = org.bouncycastle.util.encoders.Base64.decode(token.getIv());

    IvParameterSpec spec = new IvParameterSpec(iv);
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(Cipher.DECRYPT_MODE, GlobalEntries.getGlobalEntries().getConfigManager()
            .getSecretKey(idp.getTrusts().get(this.trustName).getCodeLastmileKeyName()), spec);

    byte[] encBytes = org.bouncycastle.util.encoders.Base64.decode(token.getEncryptedRequest());
    String refreshToken = new String(cipher.doFinal(encBytes));

    OIDCSession session = idp.getSessionByRefreshToken(refreshToken);

    if (session == null) {
        response.setStatus(401);
    } else {
        response.getWriter().print(session.getIdToken());
    }

}

From source file:eml.studio.shared.util.Aes.java

/** 
 * Aes Decryption/* www .  ja  v a  2 s  .  c o  m*/
 * 
 * @param encryptBytes byte[] to be decrypted
 * @param decryptKey decryption key 
 * @return 
 * @throws Exception 
 */
public static String aesDecryptByBytes(byte[] encryptBytes, String decryptKey) throws Exception {
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    kgen.init(128);

    Cipher cipher = Cipher.getInstance(ALGORITHMSTR);
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(), "AES"));
    byte[] decryptBytes = cipher.doFinal(encryptBytes);
    return new String(decryptBytes);
}

From source file:com.fengduo.bee.commons.security.EncryptBuilder.java

public String decrypt(String secret, String secretKey) {
    if (StringUtils.isEmpty(secret) || StringUtils.isEmpty(secretKey)) {
        return null;
    }/*from   w  w  w. j  a  va2  s.c o  m*/
    // Key?16?
    if (secretKey.length() != 16) {
        logger.error("Key?16?");
        return null;
    }
    try {

        return new String(doCrypt(secret, secretKey, new ICrypt() {

            @Override
            public void initCipher(SecretKey key, SecureRandom sr, Cipher cipher) throws InvalidKeyException {
                cipher.init(Cipher.DECRYPT_MODE, key, sr);
            }

            @Override
            public byte[] getCryptedData(String secret) {
                return Base64.decode(secret);
            }
        }));

    } catch (Exception e) {
        String info = secret + "\r\n" + ExceptionUtils.getFullStackTrace(e);
        logger.error(info);
    }
    return null;
}

From source file:com.miyue.util.Cryptos.java

/**
 * AES, .// w  w w  .  j  a  v a  2 s .c  o  m
 * 
 * @param input Hex?
 * @param key ?AES?
 */
public static String aesDecrypt(byte[] input, byte[] key) {
    byte[] decryptResult = aes(input, key, Cipher.DECRYPT_MODE);
    return new String(decryptResult);
}

Example usage for javax.crypto Cipher DECRYPT_MODE

Introduction

Prototype

Document

Usage