Example usage for java.math BigInteger BigInteger

Introduction

In this page you can find the example usage for java.math BigInteger BigInteger.

Prototype

private BigInteger(byte[] magnitude, int signum) 

Source Link

Document

This private constructor is for internal use and assumes that its arguments are correct.

Usage

From source file:Main.java

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

    try {//from ww w  . j  ava  2  s. c  om
        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;
}

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From source file:Main.java

public static String getJwkPublic(KeyPair kp) {
    try {/*from  w ww . j  a  va 2  s  .  c  om*/
        JSONObject jk = new JSONObject();
        jk.put("kty", "RSA");
        // generate random kid 
        SecureRandom random = new SecureRandom();
        String kid = new BigInteger(130, random).toString(32);
        jk.put("kid", kid);
        jk.put("e", "AQAB");

        KeyFactory kfactory = KeyFactory.getInstance("RSA");

        RSAPublicKeySpec kspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(), RSAPublicKeySpec.class);

        jk.put("n", encodeB64(kspec.getModulus().toByteArray()));
        JSONArray ja = new JSONArray();
        ja.put(jk);
        JSONObject jo = new JSONObject();
        jo.put("keys", ja);

        // Log.d("getJwkPublic key: ",pubkey.toString());
        // Log.d("getJwkPublic jwk: ",jo.toString());

        return jo.toString();

    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

---

From source file:Main.java

public static String getJwkPrivate(KeyPair kp) {
    try {/*from  w w w .j av a  2s . c o  m*/
        JSONObject jk = new JSONObject();
        jk.put("kty", "RSA");
        // generate random kid 
        SecureRandom random = new SecureRandom();
        String kid = new BigInteger(130, random).toString(32);
        jk.put("kid", kid);
        jk.put("e", "AQAB");

        KeyFactory kfactory = KeyFactory.getInstance("RSA");

        RSAPrivateKeySpec privkspec = (RSAPrivateKeySpec) kfactory.getKeySpec(kp.getPrivate(),
                RSAPrivateKeySpec.class);
        RSAPublicKeySpec pubkspec = (RSAPublicKeySpec) kfactory.getKeySpec(kp.getPublic(),
                RSAPublicKeySpec.class);

        // Log.d("getJwkPrivate n",pubkspec.getPublicExponent().toString());
        // Log.d("getJwkPrivate d",privkspec.getPrivateExponent().toString());

        jk.put("n", encodeB64(pubkspec.getModulus().toByteArray()));
        jk.put("d", encodeB64(privkspec.getPrivateExponent().toByteArray()));
        JSONArray ja = new JSONArray();
        ja.put(jk);
        JSONObject jo = new JSONObject();
        jo.put("keys", ja);

        return jo.toString();

    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

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From source file:com.alibaba.otter.shared.common.utils.ByteUtils.java

public static BigInteger hexToBigInt(String hex) {
    return new BigInteger(hex, 16);
}

---

From source file:HashUtil.java

public static String getMD5(final String data) {
    try {/*from   w w  w .  j av  a 2s . c om*/
        MessageDigest m = MessageDigest.getInstance("MD5");
        m.reset();
        m.update(data.getBytes());
        BigInteger bigInt = new BigInteger(1, m.digest());
        String hashtext = bigInt.toString(16);
        while (hashtext.length() < 32) {
            hashtext = "0" + hashtext;
        }
        return hashtext;
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        return e.getMessage();
    }
}

---

From source file:Hex.java

/**
 * Decodar hex till binrt/*from  w w  w . j  av a  2s  . c o  m*/
 *
 *@param dataStr Strng innehllande hex-representation av data
 *@return byte[] innhllande binr representation av data
 **/
public static byte[] decode(String dataStr) {

    if ((dataStr.length() & 0x01) == 0x01)
        dataStr = new String(dataStr + "0");
    BigInteger cI = new BigInteger(dataStr, 16);
    byte[] data = cI.toByteArray();

    return data;
}

---

From source file:Main.java

/**
 * Converts an array of bytes to a string of hexadecimal characters.
 * Leading null bytes are preserved in the output.
 * <p>//from w  w  w  . j a va2 s. co m
 * The input byte stream is assumed to be a positive, two's complement
 * representation of an integer.  The return value is the hexadecimal string
 * representation of this value.
 * 
 * @param bytes  the bytes to convert
 * @return       the string representation
 */
public static String bytesToHexString(byte[] bytes) {
    if (bytes == null || bytes.length == 0) {
        return "";
    }
    BigInteger bigint = new BigInteger(1, bytes);
    int formatLen = bytes.length * 2;
    return String.format("%0" + formatLen + "x", bigint);
}

---

From source file:cn.edu.bit.whitesail.utils.MD5Signature.java

public static String calculate(byte[] byteArray) {
    StringBuffer result = null;/* w  w w  .ja va  2s  . c om*/
    if (byteArray == null)
        return null;
    try {
        MessageDigest m = MessageDigest.getInstance("MD5");
        m.update(byteArray);
        result = new StringBuffer(new BigInteger(1, m.digest()).toString(16));
        for (int i = 0; i < 32 - result.length(); i++)
            result.insert(0, '0');
    } catch (NoSuchAlgorithmException ex) {
        LOG.fatal("MD5 Hashing Failed,System is going down");
        System.exit(1);
    }
    return result.toString();
}

---

From source file:Main.java

public static String getMD5(String value) {
    if (value == null || value.length() == 0)
        return null;

    MessageDigest m = null;//  ww w .  j a  va  2 s  . com

    try {
        m = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
        return null;
    }

    m.update(value.getBytes(), 0, value.length());
    return new BigInteger(1, m.digest()).toString(16).toUpperCase(Locale.getDefault());
}

---

From source file:Main.java

/**
 *  http://download.oracle.com/javase/1.5.0/docs/guide/security/CryptoSpec.html
 *  Signature Format   ASN.1 sequence of two INTEGER values: r and s, in that order:
 *                                SEQUENCE ::= { r INTEGER, s INTEGER }
 *
 *  http://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One
 *  30 -- tag indicating SEQUENCE//from www.  j  a v  a2s.  c om
 *  xx - length in octets
 *
 *  02 -- tag indicating INTEGER
 *  xx - length in octets
 *  xxxxxx - value
 *
 *  Convert to BigInteger and back so we have the minimum length representation, as required.
 *  r and s are always non-negative.
 *
 *  Only supports sigs up to about 252 bytes. See code to fix BER encoding for this before you
 *  add a SigType with bigger signatures.
 *
 *  @throws IllegalArgumentException if too big
 *  @since 0.8.7, moved to SigUtil in 0.9.9
 */
private static byte[] sigBytesToASN1(byte[] sig) {
    //System.out.println("pre TO asn1\n" + net.i2p.util.HexDump.dump(sig));
    int len = sig.length;
    int sublen = len / 2;
    byte[] tmp = new byte[sublen];

    System.arraycopy(sig, 0, tmp, 0, sublen);
    BigInteger r = new BigInteger(1, tmp);
    byte[] rb = r.toByteArray();
    if (rb.length > 127)
        throw new IllegalArgumentException("FIXME R length > 127");
    System.arraycopy(sig, sublen, tmp, 0, sublen);
    BigInteger s = new BigInteger(1, tmp);
    byte[] sb = s.toByteArray();
    if (sb.length > 127)
        throw new IllegalArgumentException("FIXME S length > 127");
    int seqlen = rb.length + sb.length + 4;
    if (seqlen > 255)
        throw new IllegalArgumentException("FIXME seq length > 255");
    int totlen = seqlen + 2;
    if (seqlen > 127)
        totlen++;
    byte[] rv = new byte[totlen];
    int idx = 0;

    rv[idx++] = 0x30;
    if (seqlen > 127)
        rv[idx++] = (byte) 0x81;
    rv[idx++] = (byte) seqlen;

    rv[idx++] = 0x02;
    rv[idx++] = (byte) rb.length;
    System.arraycopy(rb, 0, rv, idx, rb.length);
    idx += rb.length;

    rv[idx++] = 0x02;
    rv[idx++] = (byte) sb.length;
    System.arraycopy(sb, 0, rv, idx, sb.length);

    //System.out.println("post TO asn1\n" + net.i2p.util.HexDump.dump(rv));
    return rv;
}

---

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