Example usage for java.security KeyFactory getInstance

Introduction

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

Prototype

public static KeyFactory getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException

Source Link

Document

Returns a KeyFactory object that converts public/private keys of the specified algorithm.

Usage

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    byte[] input = new byte[] { (byte) 0xbe, (byte) 0xef };
    Cipher cipher = Cipher.getInstance("RSA/None/NoPadding", "BC");

    KeyFactory keyFactory = KeyFactory.getInstance("RSA", "BC");
    RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(new BigInteger("12345678", 16),
            new BigInteger("11", 16));
    RSAPrivateKeySpec privKeySpec = new RSAPrivateKeySpec(new BigInteger("12345678", 16),
            new BigInteger("12345678", 16));

    RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec);
    RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(privKeySpec);

    cipher.init(Cipher.ENCRYPT_MODE, pubKey);

    byte[] cipherText = cipher.doFinal(input);
    System.out.println("cipher: " + new String(cipherText));

    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] plainText = cipher.doFinal(cipherText);
    System.out.println("plain : " + new String(plainText));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");

    generator.initialize(128, new SecureRandom());
    KeyPair pair = generator.generateKeyPair();
    ASN1InputStream aIn = new ASN1InputStream(pair.getPublic().getEncoded());
    SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(aIn.readObject());

    System.out.println(ASN1Dump.dumpAsString(info));
    System.out.println(ASN1Dump.dumpAsString(info.getPublicKey()));

    X509EncodedKeySpec x509Spec = new X509EncodedKeySpec(pair.getPublic().getEncoded());
    KeyFactory keyFact = KeyFactory.getInstance("RSA", "BC");
    PublicKey pubKey = keyFact.generatePublic(x509Spec);

    System.out.println(pubKey.equals(pair.getPublic()));
}

From source file:Main.java

static Key base64ToRsaPublicKey(String b64) {
    if (b64 != null) {
        try {//from   w w  w.  j a  v a2s  .  co m
            byte[] keyBytes = decodeB64(b64);
            if (keyBytes != null) {
                KeyFactory keyFactory = KeyFactory.getInstance("RSA", "SC");
                EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(keyBytes);
                return keyFactory.generatePublic(publicKeySpec);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}

From source file:Main.java

static PublicKey getRsaPublicKey(String n, String e) {
    BigInteger rsaN = null;//from   w w w  .j ava  2s . co  m
    BigInteger rsaE = null;

    try {
        rsaN = new BigInteger(n);
        rsaE = new BigInteger(e);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    RSAPublicKeySpec pubRsaSpec = new RSAPublicKeySpec(rsaN, rsaE);
    try {
        KeyFactory keyfact = KeyFactory.getInstance("RSA", "SC");
        PublicKey pk = keyfact.generatePublic(pubRsaSpec);
        Log.d("getRsaPublicKey", "pubRsaKey OK " + pk.getFormat());
        return pk;
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    return null;
}

From source file:Main.java

public static PublicKey pubKeyFromJwk(String jwkp) {
    PublicKey pubKey = null;//from ww  w.j  a v a2s  .com

    try {
        JSONObject jk = new JSONObject(jwkp).getJSONArray("keys").getJSONObject(0);

        BigInteger n = new BigInteger(1, decodeB64(jk.getString("n")));
        BigInteger e = new BigInteger(1, decodeB64(jk.getString("e")));
        RSAPublicKeySpec pubRsaSpec = new RSAPublicKeySpec(n, e);
        KeyFactory keyfact = KeyFactory.getInstance("RSA", "SC");
        pubKey = keyfact.generatePublic(pubRsaSpec);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return pubKey;
}

From source file:Main.java

public static RSAPrivateKey privKeyFromJwk(String jwkp) {
    RSAPrivateKey privKey = null;

    try {// w w  w.  jav a 2  s .co  m
        JSONObject jk = new JSONObject(jwkp).getJSONArray("keys").getJSONObject(0);

        BigInteger n = new BigInteger(1, decodeB64(jk.getString("n")));
        BigInteger d = new BigInteger(1, decodeB64(jk.getString("d")));

        RSAPrivateKeySpec privRsaSpec = new RSAPrivateKeySpec(n, d);
        KeyFactory keyfact = KeyFactory.getInstance("RSA", "SC");
        privKey = (RSAPrivateKey) keyfact.generatePrivate(privRsaSpec);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return privKey;
}

From source file:com.alliander.osgp.shared.security.CertificateHelper.java

/**
 * Create private key from private key file on disk
 *
 * @param keyPath//from www.  j  a v a2 s. c  o  m
 *            path to key
 * @param keyType
 *            type of key
 * @return instance of public key
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeySpecException
 * @throws IOException
 * @throws NoSuchProviderException
 */
public static PrivateKey createPrivateKey(final String keyPath, final String keyType, final String provider)
        throws NoSuchAlgorithmException, InvalidKeySpecException, IOException, NoSuchProviderException {
    final byte[] key = readKeyFromDisk(keyPath);

    final PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory privateKeyFactory;
    privateKeyFactory = KeyFactory.getInstance(keyType, provider);
    return privateKeyFactory.generatePrivate(privateKeySpec);
}

From source file:com.cloud.utils.crypt.RSAHelper.java

private static RSAPublicKey readKey(String key) throws Exception {
    byte[] encKey = Base64.decodeBase64(key.split(" ")[1]);
    DataInputStream dis = new DataInputStream(new ByteArrayInputStream(encKey));

    byte[] header = readElement(dis);
    String pubKeyFormat = new String(header);
    if (!pubKeyFormat.equals("ssh-rsa"))
        throw new RuntimeException("Unsupported format");

    byte[] publicExponent = readElement(dis);
    byte[] modulus = readElement(dis);

    KeySpec spec = new RSAPublicKeySpec(new BigInteger(modulus), new BigInteger(publicExponent));
    KeyFactory keyFactory = KeyFactory.getInstance("RSA", BouncyCastleProvider.PROVIDER_NAME);
    RSAPublicKey pubKey = (RSAPublicKey) keyFactory.generatePublic(spec);

    return pubKey;
}

From source file:com.alliander.osgp.shared.security.CertificateHelper.java

/**
 * Create public key from public key file on disk
 *
 * @param keyPath//from  w w  w .jav a 2  s  .  c  om
 *            path to key
 * @param keyType
 *            type of key
 * @return instance of public key
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeySpecException
 * @throws IOException
 * @throws NoSuchProviderException
 */
public static PublicKey createPublicKey(final String keyPath, final String keyType, final String provider)
        throws NoSuchAlgorithmException, InvalidKeySpecException, IOException, NoSuchProviderException {
    final byte[] key = readKeyFromDisk(keyPath);

    final X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(key);
    final KeyFactory publicKeyFactory = KeyFactory.getInstance(keyType, provider);
    return publicKeyFactory.generatePublic(publicKeySpec);
}

From source file:cn.mrdear.pay.util.RSAUtils.java

/**
 * ??//from  w w w  . ja  v  a 2 s  .co  m
 * 
 * @param encodedKey
 *            ?
 * @return ?
 */
public static PrivateKey generatePrivateKey(byte[] encodedKey) {

    try {
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM, PROVIDER);
        return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(encodedKey));
    } catch (NoSuchAlgorithmException e) {
        throw new RuntimeException(e.getMessage(), e);
    } catch (InvalidKeySpecException e) {
        throw new RuntimeException(e.getMessage(), e);
    }
}