国内私募机构九鼎控股打造APP,来就送 20元现金领取地址:http://jdb.jiudingcapital.com/phone.html
内部邀请码:C8E245J (不写邀请码,没有现金送)
国内私募机构九鼎控股打造,九鼎投资是在全国股份转让系统挂牌的公众公司,股票代码为430719,为“中国PE第一股”,市值超1000亿元。
内部邀请码:C8E245J (不写邀请码,没有现金送)
国内私募机构九鼎控股打造,九鼎投资是在全国股份转让系统挂牌的公众公司,股票代码为430719,为“中国PE第一股”,市值超1000亿元。
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原文地址: http://wlh.iteye.com/blog/134796
生成RSA密钥、保存到文件、从文件读取、加密、解密等操作。
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import javax.crypto.Cipher;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.bouncycastle.jce.provider.BouncyCastleProvider; public class RSATest { public static void main(String[] args) {
try {
RSATest encrypt = new RSATest();
String encryptText = "encryptText"; // Generate keys
KeyPair keyPair = encrypt.generateKey();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); byte[] e = encrypt.encrypt(publicKey, encryptText.getBytes());
byte[] de = encrypt.decrypt(privateKey, e);
System.out.println(toHexString(e));
System.out.println(toHexString(de));
} catch (Exception e) {
e.printStackTrace();
}
} public KeyPair generateKey() throws NoSuchAlgorithmException {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
keyPairGen.initialize(1024, new SecureRandom()); KeyPair keyPair = keyPairGen.generateKeyPair();
return keyPair;
} public void saveKey(KeyPair keyPair, String publicKeyFile,
String privateKeyFile) throws ConfigurationException {
PublicKey pubkey = keyPair.getPublic();
PrivateKey prikey = keyPair.getPrivate(); // save public key
PropertiesConfiguration publicConfig = new PropertiesConfiguration(
publicKeyFile);
publicConfig.setProperty("PULIICKEY", toHexString(pubkey.getEncoded()));
publicConfig.save(); // save private key
PropertiesConfiguration privateConfig = new PropertiesConfiguration(
privateKeyFile);
privateConfig.setProperty("PRIVATEKEY",
toHexString(prikey.getEncoded()));
privateConfig.save();
} /**
* @param filename
* @param type:
* 1-public 0-private
* @return
* @throws ConfigurationException
* @throws NoSuchAlgorithmException
* @throws InvalidKeySpecException
*/
public Key loadKey(String filename, int type)
throws ConfigurationException, NoSuchAlgorithmException,
InvalidKeySpecException {
PropertiesConfiguration config = new PropertiesConfiguration(filename);
KeyFactory keyFactory = KeyFactory.getInstance("RSA",
new BouncyCastleProvider()); if (type == 0) {
// privateKey
String privateKeyValue = config.getString("PULIICKEY");
PKCS8EncodedKeySpec priPKCS8 = new PKCS8EncodedKeySpec(
toBytes(privateKeyValue));
PrivateKey privateKey = keyFactory.generatePrivate(priPKCS8);
return privateKey; } else {
// publicKey
String privateKeyValue = config.getString("PRIVATEKEY");
X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(
toBytes(privateKeyValue));
PublicKey publicKey = keyFactory.generatePublic(bobPubKeySpec);
return publicKey;
}
} /**
* Encrypt String.
*
* @return byte[]
*/
protected byte[] encrypt(RSAPublicKey publicKey, byte[] data) {
if (publicKey != null) {
try {
Cipher cipher = Cipher.getInstance("RSA",
new BouncyCastleProvider());
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(data);
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
} /**
* Basic decrypt method
*
* @return byte[]
*/
protected byte[] decrypt(RSAPrivateKey privateKey, byte[] raw) {
if (privateKey != null) {
try {
Cipher cipher = Cipher.getInstance("RSA",
new BouncyCastleProvider());
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(raw);
} catch (Exception e) {
e.printStackTrace();
}
} return null;
} public static String toHexString(byte[] b) {
StringBuilder sb = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
sb.append(HEXCHAR[(b[i] & 0xf0) >>> 4]);
sb.append(HEXCHAR[b[i] & 0x0f]);
}
return sb.toString();
} public static final byte[] toBytes(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 char[] HEXCHAR = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; }