Example usage for java.security.spec RSAPublicKeySpec RSAPublicKeySpec

Introduction

In this page you can find the example usage for java.security.spec RSAPublicKeySpec RSAPublicKeySpec.

Prototype

public RSAPublicKeySpec(BigInteger modulus, BigInteger publicExponent) 

Source Link

Document

Creates a new RSAPublicKeySpec.

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));
}

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From source file:Main.java

public static PublicKey getPublicKey(String n, String publicExponent) {
    KeySpec publicKeySpec = new RSAPublicKeySpec(new BigInteger(n, 16), new BigInteger(publicExponent, 16));

    KeyFactory factory = null;//ww w  .j  a  v  a2s  .co  m
    PublicKey publicKey = null;
    try {
        factory = KeyFactory.getInstance(KEY_ALGORITHM);
    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;
    }

    try {
        publicKey = factory.generatePublic(publicKeySpec);
    } catch (InvalidKeySpecException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        return null;
    }

    return publicKey;
}

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From source file:Main.java

public static PrivateKey getPrivateKey(String modulus, String privateExponent)
        throws NoSuchAlgorithmException, InvalidKeySpecException {
    BigInteger bigIntModulus = new BigInteger(modulus);
    BigInteger bigIntPrivateExponent = new BigInteger(privateExponent);
    RSAPublicKeySpec keySpec = new RSAPublicKeySpec(bigIntModulus, bigIntPrivateExponent);
    KeyFactory keyFactory = KeyFactory.getInstance(RSA);
    PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
    return privateKey;
}

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From source file:Main.java

static PublicKey getRsaPublicKey(String n, String e) {
    BigInteger rsaN = null;//w  ww  .  j  av  a  2 s . c  o  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;
}

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From source file:Main.java

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

    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;
}

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From source file:Main.java

public static byte[] getRSAEncryptedData(byte[] dataWithHash) {
    BigInteger modulus = new BigInteger(
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
            16);/*from w ww  .j  a  v a  2s. co m*/
    BigInteger pubExp = new BigInteger("010001", 16);

    KeyFactory keyFactory = null;
    try {
        keyFactory = KeyFactory.getInstance("RSA");
        RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(modulus, pubExp);
        RSAPublicKey key = (RSAPublicKey) keyFactory.generatePublic(pubKeySpec);

        Cipher cipher = Cipher.getInstance("RSA/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] cipherData = cipher.doFinal(dataWithHash);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    } catch (InvalidKeyException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    } catch (BadPaddingException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    } catch (InvalidKeySpecException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    } catch (NoSuchPaddingException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
    }
    return null;
}

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From source file:se.curity.examples.oauth.jwt.RsaPublicKeyCreator.java

public static PublicKey createPublicKey(String modulus, String exponent)
        throws InvalidKeySpecException, NoSuchAlgorithmException {
    Base64 decoder = new Base64(true);
    BigInteger bigModulus = new BigInteger(1, decoder.decode(modulus));
    BigInteger bigExponent = new BigInteger(1, decoder.decode(exponent));
    RSAPublicKeySpec publicKeySpec = new RSAPublicKeySpec(bigModulus, bigExponent);
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);

    return publicKey;
}

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From source file:Main.java

public static RSAPublicKeySpec getRecipientsPublicKey(String contactNum, Context context) {
    Log.w(TAG, "retrieving public key for contact " + contactNum);
    SharedPreferences prefs = context.getSharedPreferences(contactNum, Context.MODE_PRIVATE);

    String pubMod = prefs.getString(PREF_PUBLIC_MOD, DEFAULT_PREF);
    String pubExp = prefs.getString(PREF_PUBLIC_EXP, DEFAULT_PREF);
    Log.w(TAG, "the public modulus is " + pubMod + " and exponent is " + pubExp + " for " + contactNum);
    // String recipient = prefs.getString(PREF_RECIPIENT_NUM, DEFAULT_PREF);
    if (!pubMod.isEmpty() && !pubExp.isEmpty()) {
        Log.i(TAG, "great! public key found for " + contactNum + " with modulus " + pubMod + " and exponent "
                + pubExp);/*  w  w w.  ja v  a 2 s . c  o  m*/
        byte[] pubModBA = Base64.decode(pubMod, Base64.DEFAULT);
        byte[] pubExpBA = Base64.decode(pubExp, Base64.DEFAULT);
        BigInteger pubModBI = new BigInteger(1, pubModBA); // 1 is added as
        // an attempt to
        // deal with
        // com.android.org.bouncycastle.crypto.DataLengthException:
        // input too
        // large for RSA
        // cipher
        BigInteger pubExpBI = new BigInteger(1, pubExpBA);
        Log.i(TAG, "public modulus is " + pubModBI + " and public exponent is " + pubExpBI + " in base 256 "
                + pubModBA + " " + pubExpBA);

        // do I need to catch any exception for the following?
        RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(pubModBI, pubExpBI);
        // X509EncodedKeySpec publicKeySpec = new
        // X509EncodedKeySpec(encodedKey);

        return pubKeySpec;
    }
    Log.w(TAG, "recipient's public key not found");
    return null;

}

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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;
}

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From source file:license.rsa.WakeRSA.java

/**
 * ?/*  ww w.  j  ava 2 s .  c o  m*/
 * 
 * @param keyFileName
 * @return
 * @throws Exception
 */
static PublicKey readPublicKeyFromFile() throws Exception {
    ObjectInputStream oin = new ObjectInputStream(new ByteArrayInputStream(KeyData.publicKey));
    try {
        BigInteger m = (BigInteger) oin.readObject();
        BigInteger e = (BigInteger) oin.readObject();
        System.out.println();
        System.out.println();
        System.out.println("=======mmm=====" + m);
        System.out.println("=======eeee=====" + e);
        System.out.println();
        System.out.println();
        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(m, e);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        return fact.generatePublic(keySpec);
    } finally {
        oin.close();
    }
}

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