| package com._21cn.cryptto; import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom; public class GenerateKeyPair { private String priKey;
private String pubKey;
public void run() {
try {
java.security.KeyPairGenerator keygen = java.security.KeyPairGenerator
.getInstance("RSA");
SecureRandom secrand = new SecureRandom();
secrand.setSeed("21cn".getBytes()); // 初始化隨機產生器
keygen.initialize(1024, secrand);
KeyPair keys = keygen.genKeyPair(); PublicKey pubkey = keys.getPublic();
PrivateKey prikey = keys.getPrivate(); pubKey = bytesToHexStr(pubkey.getEncoded()); priKey = bytesToHexStr(prikey.getEncoded()); System.out.println("pubKey=" + pubKey);
System.out.println("priKey=" + priKey); System.out.println("寫入對象 pubkeys ok");
System.out.println("產生金鑰組成功");
} catch (java.lang.Exception e) {
e.printStackTrace();
System.out.println("產生金鑰組失敗");
}
; } /**
* Transform the specified byte into a Hex String form.
*/
public static final String bytesToHexStr(byte[] bcd) {
StringBuffer s = new StringBuffer(bcd.length * 2); for (int i = 0; i < bcd.length; i++) {
s.append(bcdLookup[(bcd[i] >>> 4) & 0x0f]);
s.append(bcdLookup[bcd[i] & 0x0f]);
} return s.toString();
} /**
* Transform the specified Hex String into a byte array.
*/
public static final byte[] hexStrToBytes(String s) {
byte[] bytes; bytes = new byte[s.length() / 2]; for (int i = 0; i < bytes.length; i++) {
bytes[i] = (byte) Integer.parseInt(s.substring(2 * i, 2 * i + 2),
16);
} return bytes;
} private static final char[] bcdLookup = { '0', '1', '2', '3', '4', '5',
'6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
GenerateKeyPair n = new GenerateKeyPair();
n.run();
} |
