Example usage for java.security KeyFactory getAlgorithm

Introduction

In this page you can find the example usage for java.security KeyFactory getAlgorithm.

Prototype

public final String getAlgorithm() 

Source Link

Document

Gets the name of the algorithm associated with this KeyFactory .

Usage

From source file:cn.lynx.emi.license.ViewLicense.java

private static final String _decrypt(String data) {
    byte[] corekey = Base64.decodeBase64(LICENSE_CORE_KEY);
    byte[] rawData = Base64.decodeBase64(data);

    X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(corekey);
    try {/*  ww w  .  j a  v a  2  s .c  o m*/
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        Key publicKey = keyFactory.generatePublic(x509EncodedKeySpec);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.DECRYPT_MODE, publicKey);

        return new String(cipher.doFinal(rawData), "UTF-8");
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

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From source file:cn.lynx.emi.license.GenerateLicense.java

private static final String encrypt(String key, String data) {
    byte[] corekey = Base64.decodeBase64(key);

    PKCS8EncodedKeySpec pkspec = new PKCS8EncodedKeySpec(corekey);

    try {//w  w  w. j  a v a  2 s .c om
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        Key privateKey = keyFactory.generatePrivate(pkspec);

        Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] encData = cipher.doFinal(data.getBytes("UTF-8"));
        System.out.println("after encrypt, len=" + encData.length);
        return Base64.encodeBase64String(encData);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

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From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * ?//from   ww w  .  j  a  v  a  2s  .  c om
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {
    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

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From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * ?//w  w w  .  j  a  v a  2s .c  o  m
 * 
 * @param data?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {

    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

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From source file:com.zf.decipher.DataEn.java

private static byte[] getSecretKey(byte[] publicKey, byte[] privateKey) throws Exception {
    KeyFactory keyFactory = KeyFactory.getInstance("DH");
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKey);
    PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKey);
    PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
    KeyAgreement keyAgree = KeyAgreement.getInstance(keyFactory.getAlgorithm());
    keyAgree.init(priKey);/*from   w w w  . ja v a 2 s .  c  om*/
    keyAgree.doPhase(pubKey, true);
    return keyAgree.generateSecret(AES).getEncoded();
}

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From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * //from   www. java 2s.  c o  m
 *
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // ?
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.ENCRYPT_MODE, publicKey);

    return cipher.doFinal(data);
}

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From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * //from   ww  w  .j a v a 2s .c o  m
 *
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // ?
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    // ?
    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, publicKey);

    return cipher.doFinal(data);
}

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From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * ?//from w  w w .j a v a2 s  .  co  m
 *
 * @param data
 *            ?
 * @param key
 *            ?
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {

    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, privateKey);

    return cipher.doFinal(data);
}

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From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * ?/*w w  w .j a  va 2s.c o  m*/
 *
 * @param data
 *            ?
 * @param key
 *            ?
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {

    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.ENCRYPT_MODE, privateKey);

    return cipher.doFinal(data);
}

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From source file:com.zxy.commons.codec.rsa.RSAUtils.java

/**
 * <p>/*from w  w  w.java  2  s .  c  o  m*/
 * 
 * </p>
 * 
 * @param encryptedData ?
 * @param publicKey (BASE64?)
 * @return byte
 * @throws Exception Exception
 */
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey) throws Exception {
    byte[] keyBytes = Base64.decodeBase64(publicKey);
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    Key publicK = keyFactory.generatePublic(x509KeySpec);
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, publicK);
    int inputLen = encryptedData.length;
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    int offSet = 0;
    byte[] cache;
    int index = 0;
    // ?
    while (inputLen - offSet > 0) {
        if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
            cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);
        } else {
            cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);
        }
        out.write(cache, 0, cache.length);
        index++;
        offSet = index * MAX_DECRYPT_BLOCK;
    }
    byte[] decryptedData = out.toByteArray();
    out.close();
    return decryptedData;
}

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