MD加密常用於加密用戶名密碼當用戶驗證時
protected byte[] encrypt(byte[] obj) {
try {
MessageDigest md = MessageDigestgetInstance(MD);
mdupdate(obj);
return mddigest();
} catch (NoSuchAlgorithmException e) {
eprintStackTrace();
}
}
SHA加密與MD相似的用法只是兩者的算法不同
protected byte[] encrypt(byte[] obj) {
try {
MessageDigest sha = MessageDigestgetInstance(SHA);
shaupdate(obj);
return shadigest();
} catch (NoSuchAlgorithmException e) {
eprintStackTrace();
}
}
RSA加密RAS加密允許解密常用於文本內容的加密
import javasecurityKeyPair;
import javasecurityKeyPairGenerator;
import javasecurityinterfacesRSAPrivateKey;
import javasecurityinterfacesRSAPublicKey;
import javaxcryptoCipher; /** *//**
* RSAEncrypt
*
* @author maqujun
* @see
*/
public class RSAEncrypt {
/** *//**
* Main method for RSAEncrypt
* @param args
*/
public static void main(String[] args) {
try {
RSAEncrypt encrypt = new RSAEncrypt();
String encryptText = encryptText;
KeyPairGenerator keyPairGen = KeyPairGeneratorgetInstance(RSA);
keyPairGeninitialize();
KeyPair keyPair = keyPairGengenerateKeyPair();
// Generate keys
RSAPrivateKey privateKey = (RSAPrivateKey) keyPairgetPrivate();
RSAPublicKey publicKey = (RSAPublicKey) keyPairgetPublic();
byte[] e = encryptencrypt(publicKey encryptTextgetBytes());
byte[] de = encryptdecrypt(privateKeye);
Systemoutprintln(encryptbytesToString(e));
Systemoutprintln(encryptbytesToString(de));
} catch (Exception e) {
eprintStackTrace();
}
}
/** *//**
* Change byte array to String
* @return byte[]
*/
protected String bytesToString(byte[] encrytpByte) {
String result = ;
for (Byte bytes : encrytpByte) {
result += (char) bytesintValue();
}
return result;
}
/** *//**
* Encrypt String
* @return byte[]
*/
protected byte[] encrypt(RSAPublicKey publicKey byte[] obj) {
if (publicKey != null) {
try {
Cipher cipher = CiphergetInstance(RSA);
cipherinit(CipherENCRYPT_MODE publicKey);
return cipherdoFinal(obj);
} catch (Exception e) {
eprintStackTrace();
}
}
return null;
}
/** *//**
* Basic decrypt method
* @return byte[]
*/
protected byte[] decrypt(RSAPrivateKey privateKey byte[] obj) {
if (privateKey != null) {
try {
Cipher cipher = CiphergetInstance(RSA);
cipherinit(CipherDECRYPT_MODE privateKey);
return cipherdoFinal(obj);
} catch (Exception e) {
eprintStackTrace();
}
}
return null;
}
}
From:http://tw.wingwit.com/Article/program/Java/hx/201311/26800.html
