关注设计创意栏目可以让大家能更好的了解电脑,知道有关于电脑的更多有趣教程，今天给大家分享Java中常用的加密算法应用MD5SHA,RSA教程,希望对大家能有一点小小的帮助。
1. MD5加密，常用于加密用户名密码，当用户验证时。
protected byte[] encrypt(byte[] obj) ...{
try ...{
MessageDigest md5 = ("");
();
return ();
} catch (NoSUChAlgorithmException e) ...{
();
}
}
2. SHA加密，与MD5相似的用法，只是两者的算法不同。
protected byte[] encrypt(byte[] obj) ...{
try ...{
MessageDigest sha = ("");
();
return ();
} catch (NoSuchAlgorithmException e) ...{
();
}
}
3. RSA加密，RAS加密答应解密。常用于文本内容的加密。
;
import ;
import ;
import ;
import ;
/** *//**
* bRSAEncrypt/b
* p
* @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 = ("");
();
KeyPair keyPair = ();
// Generate keys
RSAPrivateKey privateKey = (RSAPrivateKey) ();
RSAPublicKey publicKey = (RSAPublicKey) ();
byte[] e = (publicKey, ());
byte[] de = (,);
System.out.println(encrypt.bytesToString(e));
System.out.println(encrypt.bytesToString(de));
} catch (Exception e) ...{
();
}
}
/** *//**
* Change byte array to String.
* @return byte[]
*/
protected String bytesToString(byte[] encrytpByte) ...{
String result = "";
for (Byte bytes : encrytpByte) ...{
result += (char) bytes.intValue();
}
return result;
}
/** *//**
* Encrypt String.
* @return byte[]
*/
protected byte[] encrypt(RSAPublicKey publicKey, byte[] obj) ...{
if (publicKey != null) ...{
try ...{
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(obj);
} catch (Exception e) ...{
();
}
}
return null;
}
/** *//**
*Basicdecrypt method
* @return byte[]
*/
protected byte[] decrypt(RSAPrivateKey privateKey, byte[] obj) ...{
if (privateKey != null) ...{
try ...{
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(obj);
} catch (Exception e) ...{
();
}
}
return null;
}
}
