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AES 对称加密例子
作者：黑客防线网安ASP维护基地 来源：黑客防线网安ASP维护基地 浏览次数：0 |
黑客防线网安网讯： 1 什么是AESAES是一种对称的私钥加密技术。它支持128，192，256位加密。2 AES和Java从j2se1.4.2开始，集成了JCE包。现在的java支持128位key的加密。（下面的程序也是以128位为例讲解的）...
1 什么是AES
AES是一种对称的私钥加密技术。它支持128，192，256位加密。
2 AES和Java
从j2se1.4.2开始，集成了JCE包。
现在的java支持128位key的加密。（下面的程序也是以128位为例讲解的）
3 如何使用JCE
例
Java代码
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
/**
* This program generates a AES key, retrieves its raw bytes, and
* then reinstantiates a AES key from the key bytes.
* The reinstantiated key is used to initialize a AES cipher for
* encryption and decryption.
*/
public class AES {
/**
* Turns array of bytes into string
*
* @param buf Array of bytes to convert to hex string
* @return Generated hex string
*/
public static String asHex (byte buf[]) {
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i;
for (i = 0; i < buf.length; i++) {
if (((int) buf[i] & 0xff) < 0x10)
strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
}
return strbuf.toString();
}
public static void main(String[] args) throws Exception {
String message="This is just an example";
// Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192 and 256 bits may not be available
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted =
cipher.doFinal((args.length == 0 ?
"This is just an example" : args[0]).getBytes());
System.out.println("encrypted string: " + asHex(encrypted));
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] original =
cipher.doFinal(encrypted);
String originalString = new String(original);
System.out.println("Original string: " +
originalString + " " + asHex(original));
}
}
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
/**
* This program generates a AES key, retrieves its raw bytes, and
* then reinstantiates a AES key from the key bytes.
* The reinstantiated key is used to initialize a AES cipher for
* encryption and decryption.
*/
public class AES {
/**
* Turns array of bytes into string
*
* @param bufArray of bytes to convert to hex string
* @returnGenerated hex string
*/
public static String asHex (byte buf[]) {
StringBuffer strbuf = new StringBuffer(buf.length * 2);
int i;
for (i = 0; i < buf.length; i++) {
if (((int) buf[i] & 0xff) < 0x10)
strbuf.append("0");
strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
}
return strbuf.toString();
}
public static void main(String[] args) throws Exception {
String message="This is just an example";
// Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(128); // 192 and 256 bits may not be available
// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
// Instantiate the cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted =
cipher.doFinal((args.length == 0 ?
"This is just an example" : args[0]).getBytes());
System.out.println("encrypted string: " + asHex(encrypted));
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] original =
cipher.doFinal(encrypted);
String originalString = new String(original);
System.out.println("Original string: " +
originalString + " " + asHex(original));
}
}
client端
Java代码
import java.io.*;
import java.security.*;
import javax.net.ssl.*;
import java.util.regex.*;
public class HelloClientSSL {
public static void main(String[] args) {
// Pick all AES algorithms of 256 bits key size
String patternString = "AES.*256";
Pattern pattern = Pattern.compile(patternString);
Matcher matcher;
boolean matchFound;
try {
SSLSocketFactory sslFact =
(SSLSocketFactory)SSLSocketFactory.getDefault();
SSLSocket s =
(SSLSocket)sslFact.createSocket(args.length == 0 ?
"127.0.0.1" : args[0], 8181);
String str[]=s.getSupportedCipherSuites();
int len = str.length;
String set[] = new String[len];
int j=0, k = len-1;
for (int i=0; i < len; i++) {
System.out.println(str[i]);
// Determine if pattern exists in input
matcher = pattern.matcher(str[i]);
matchFound = matcher.find();
if (matchFound)
set[j++] = str[i];
else
set[k--] = str[i];
}
s.setEnabledCipherSuites(set);
str=s.getEnabledCipherSuites();
System.out.println("Available Suites after Set:");
for (int i=0; i < str.length; i++)
System.out.println(str[i]);
OutputStream out = s.getOutputStream();
BufferedReader in = new BufferedReader (
new InputStreamReader(s.getInputStream()));
String mesg = in.readLine();
System.out.println("Socket message: " + mesg);
in.close();
} catch (Exception e) {
System.out.println("Exception" + e);
}
}
}
import java.io.*;
import java.security.*;
import javax.net.ssl.*;
import java.util.regex.*;
public class HelloClientSSL {
public static void main(String[] args) {
// Pick all AES algorithms of 256 bits key size
String patternString = "AES.*256";
Pattern pattern = Pattern.compile(patternString);
Matcher matcher;
boolean matchFound;
try {
SSLSocketFactory sslFact =
(SSLSocketFactory)SSLSocketFactory.getDefault();
SSLSocket s =
(SSLSocket)sslFact.createSocket(args.length == 0 ?
"127.0.0.1" : args[0], 8181);
String str[]=s.getSupportedCipherSuites();
int len = str.length;
String set[] = new String[len];
int j=0, k = len-1;
for (int i=0; i < len; i++) {
System.out.println(str[i]);
// Determine if pattern exists in input
matcher = pattern.matcher(str[i]);
matchFound = matcher.find();
if (matchFound)
set[j++] = str[i];
else
set[k--] = str[i];
}
s.setEnabledCipherSuites(set);
str=s.getEnabledCipherSuites();
System.out.println("Available Suites after Set:");
for (int i=0; i < str.length; i++)
System.out.println(str[i]);
OutputStream out = s.getOutputStream();
BufferedReader in = new BufferedReader (
new InputStreamReader(s.getInputStream()));
String mesg = in.readLine();
System.out.println("Socket message: " + mesg);
in.close();
} catch (Exception e) {
System.out.println("Exception" + e);
}
}
}
运行结果
Available Suites after Set:TLS_RSA_WITH_AES_256_CBC_SHATLS_DHE_RSA_WITH_AES_256_CBC_SHATLS_DHE_DSS_WITH_AES_256_CBC_SHATLS_DH_anon_WITH_AES_256_CBC_SHASSL_DH_anon_EXPORT_WITH_DES40_CBC_SHASSL_DH_anon_EXPORT_WITH_RC4_40_MD5SSL_DH_anon_WITH_DES_CBC_SHASSL_DH_anon_WITH_3DES_EDE_CBC_SHATLS_DH_anon_WITH_AES_128_CBC_SHASSL_DH_anon_WITH_RC4_128_MD5SSL_RSA_WITH_NULL_SHASSL_RSA_WITH_NULL_MD5SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHASSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHASSL_RSA_EXPORT_WITH_DES40_CBC_SHASSL_RSA_EXPORT_WITH_RC4_40_MD5SSL_DHE_DSS_WITH_DES_CBC_SHASSL_DHE_RSA_WITH_DES_CBC_SHASSL_RSA_WITH_DES_CBC_SHASSL_DHE_DSS_WITH_3DES_EDE_CBC_SHASSL_DHE_RSA_WITH_3DES_EDE_CBC_SHASSL_RSA_WITH_3DES_EDE_CBC_SHATLS_DHE_DSS_WITH_AES_128_CBC_SHATLS_DHE_RSA_WITH_AES_128_CBC_SHATLS_RSA_WITH_AES_128_CBC_SHASSL_RSA_WITH_RC4_128_SHASSL_RSA_WITH_RC4_128_MD5Using cipher suite: TLS_RSA_WITH_AES_256_CBC_SHA
别人的例子
Java代码
/**
*PrivateExmaple.java
*Copyright 2005-2-16
*/
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
/**
*˽?¼ÓÃÜ&&±&Ö¤Ï&Ï&&uÃÜÐÔ
*/
public class PrivateExample{
public static void main(String[] args) throws Exception{
byte[] plainText="12345678".getBytes();
//Í‥¹&KeyGeneratorÐγÉÒ&&&key
System.out.println(" Start generate AES key");
KeyGenerator keyGen=KeyGenerator.getInstance("AES");
keyGen.init(128);
Key key=keyGen.generateKey();
System.out.println("Finish generating AES key");
//&&&ÃÒ&&&˽?¼ÓÃÜÀaCipher&&ECBÊǼÓÃÜ·½Ê½&&PKCS5PaddingÊÇÌ&³&·½·‥
Cipher cipher=Cipher.getInstance("AES/ECB/PKCS5Padding");
System.out.println(" "+cipher.getProvider().getInfo());
//ʹÓÃ˽?¼ÓÃÜ
System.out.println(" Start encryption:");
cipher.init(Cipher.ENCRYPT_MODE,key);
byte[] cipherText=cipher.doFinal(plainText);
System.out.println("Finish encryption:");
System.out.println(new String(cipherText,"UTF8"));
System.out.println(" Start decryption:");
cipher.init(Cipher.DECRYPT_MODE,key);
byte[] newPlainText=cipher.doFinal(cipherText);
System.out.println("Finish decryption:");
System.out.println(new String(newPlainText,"UTF8"));
}
}
/**
*PrivateExmaple.java
*Copyright 2005-2-16
*/
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
/**
*˽?¼ÓÃÜ&&±&Ö¤Ï&Ï&&uÃÜÐÔ
*/
public class PrivateExample{
public static void main(String[] args) throws Exception{
byte[] plainText="12345678".getBytes();
//Í‥¹&KeyGeneratorÐγÉÒ&&&key
System.out.println(" Start generate AES key");
KeyGenerator keyGen=KeyGenerator.getInstance("AES");
keyGen.init(128);
Key key=keyGen.generateKey();
System.out.println("Finish generating AES key");
//&&&ÃÒ&&&˽?¼ÓÃÜÀaCipher&&ECBÊǼÓÃÜ·½Ê½&&PKCS5PaddingÊÇÌ&³&·½·‥
Cipher cipher=Cipher.getInstance("AES/ECB/PKCS5Padding");
System.out.println(" "+cipher.getProvider().getInfo());
//ʹÓÃ˽?¼ÓÃÜ
System.out.println(" Start encryption:");
cipher.init(Cipher.ENCRYPT_MODE,key);
byte[] cipherText=cipher.doFinal(plainText);
System.out.println("Finish encryption:");
System.out.println(new String(cipherText,"UTF8"));
System.out.println(" Start decryption:");
cipher.init(Cipher.DECRYPT_MODE,key);
byte[] newPlainText=cipher.doFinal(cipherText);
System.out.println("Finish decryption:");
System.out.println(new String(newPlainText,"UTF8"));
}
}
自己稍加修改的例子
Java代码
byte[] plainText="12345678".getBytes();
//Í‥¹&KeyGeneratorÐγÉÒ&&&key
System.out.println(" Start generate AES key");
KeyGenerator keyGen=KeyGenerator.getInstance("AES");
String pwd = "passord";
keyGen.init(128, new SecureRandom(pwd.getBytes()));
//keyGen.init(128);
//Key key=keyGen.generateKey();
SecretKey skey = keyGen.generateKey();
byte[] raw = skey.getEncoded();
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
System.out.println("Finish generating AES key");
//&&&ÃÒ&&&˽?¼ÓÃÜÀaCipher&&ECBÊǼÓÃÜ?E½Ê½&&PKCS5PaddingÊÇÌ&³&?E½?E‥
Cipher cipher=Cipher.getInstance("AES");
System.out.println(" "+cipher.getProvider().getInfo());
//ʹÓÃ˽?¼ÓÃÜ
System.out.println(" Start encryption:");
cipher.init(Cipher.ENCRYPT_MODE,skeySpec);
byte[] cipherText=cipher.doFinal(plainText);
System.out.println("Finish encryption:");
System.out.println(new String(cipherText,"UTF8"));
System.out.println(" Start decryption:");
cipher.init(Cipher.DECRYPT_MODE,skeySpec);
byte[] newPlainText=cipher.doFinal(cipherText);
System.out.println("Finish decryption:");
System.out.println(new String(newPlainText,"UTF8"));
}
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