知识大全 AES对称加密例子

Posted 2022-07-19 知

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　　什么是AES

　　AES是一种对称的私钥加密技术它支持位加密

　　 AES和Java

　　从j se 开始集成了JCE包

　　现在的java支持位key的加密（下面的程序也是以位为例讲解的）

　　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 * );

　　int i;

　　for (i = ; i < buf length; i++)

　　if (((int) buf[i] & xff) < x )

　　strbuf append( );

　　strbuf append(Long toString((int) buf[i] & xff ));

　　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( ); // and 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 == ?

　　 This is just an example : args[ ]) 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 * );

　　int i;

　　for (i = ; i < buf length; i++)

　　if (((int) buf[i] & xff) < x )

　　strbuf append( );

　　strbuf append(Long toString((int) buf[i] & xff ));

　　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( ); // and 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 == ?

　　 This is just an example : args[ ]) 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));

　　更强壮的加密

　　kgen init( ); // and bits also available

　　按照原文提示的地址可以更新下一个包然后稍微修改下加密位数就可以了不过jdk 默认只支持位的加密实际上作者也建议同时利用SSL 比单独一味强调加密位数效果要好

　　同时使用SSL和AES

　　server端

　　Java代码

　　import java io *;

　　import java security *;

　　import ssl *;

　　import java util regex *;

　　public class HelloServerSSL

　　public static void main(String[] args)

　　SSLServerSocket s;

　　// Pick all AES algorithms of bits key size

　　String patternString = AES * ;

　　Pattern pattern = pile(patternString);

　　Matcher matcher;

　　boolean matchFound;

　　try

　　SSLServerSocketFactory sslSrvFact =

　　(SSLServerSocketFactory)

　　SSLServerSocketFactory getDefault();

　　s =(SSLServerSocket)sslSrvFact createServerSocket( );

　　SSLSocket in = (SSLSocket)s accept();

　　String str[]=in getSupportedCipherSuites();

　　int len = str length;

　　String set[] = new String[len];

　　int j= k = len ;

　　for (int i= ; i < len; 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];

　　in setEnabledCipherSuites(set);

　　str=in getEnabledCipherSuites();

　　System out println( Available Suites after Set: );

　　for (int i= ; i < str length; i++)

　　System out println(str[i]);

　　System out println( Using cipher suite: +

　　(in getSession()) getCipherSuite());

　　PrintWriter out = new PrintWriter (in getOutputStream()

　　true);

　　out println( Hello on a SSL socket );

　　in close();

　　 catch (Exception e)

　　System out println( Exception + e);

　　import java io *;

　　import java security *;

　　import ssl *;

　　import java util regex *;

　　public class HelloServerSSL

　　public static void main(String[] args)

　　SSLServerSocket s;

　　// Pick all AES algorithms of bits key size

　　String patternString = AES * ;

　　Pattern pattern = pile(patternString);

　　Matcher matcher;

　　boolean matchFound;

　　try

　　SSLServerSocketFactory sslSrvFact =

　　(SSLServerSocketFactory)

　　SSLServerSocketFactory getDefault();

　　s =(SSLServerSocket)sslSrvFact createServerSocket( );

　　SSLSocket in = (SSLSocket)s accept();

　　String str[]=in getSupportedCipherSuites();

　　int len = str length;

　　String set[] = new String[len];

　　int j= k = len ;

　　for (int i= ; i < len; 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];

　　in setEnabledCipherSuites(set);

　　str=in getEnabledCipherSuites();

　　System out println( Available Suites after Set: );

　　for (int i= ; i < str length; i++)

　　System out println(str[i]);

　　System out println( Using cipher suite: +

　　(in getSession()) getCipherSuite());

　　PrintWriter out = new PrintWriter (in getOutputStream()

　　true);

　　out println( Hello on a SSL socket );

　　in close();

　　 catch (Exception e)

　　System out println( Exception + e);

　　client端

　　Java代码

　　import java io *;

　　import java security *;

　　import ssl *;

　　import java util regex *;

　　public class HelloClientSSL

　　public static void main(String[] args)

　　// Pick all AES algorithms of bits key size

　　String patternString = AES * ;

　　Pattern pattern = pile(patternString);

　　Matcher matcher;

　　boolean matchFound;

　　try

　　SSLSocketFactory sslFact =

　　(SSLSocketFactory)SSLSocketFactory getDefault();

　　SSLSocket s =

　　(SSLSocket)sslFact createSocket(args length == ?

　　 : args[ ] );

　　String str[]=s getSupportedCipherSuites();

　　int len = str length;

　　String set[] = new String[len];

　　int j= k = len ;

　　for (int i= ; 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= ; 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 ssl *;

　　import java util regex *;

　　public class HelloClientSSL

　　public static void main(String[] args)

　　// Pick all AES algorithms of bits key size

　　String patternString = AES * ;

　　Pattern pattern = pile(patternString);

　　Matcher matcher;

　　boolean matchFound;

　　try

　　SSLSocketFactory sslFact =

　　(SSLSocketFactory)SSLSocketFactory getDefault();

　　SSLSocket s =

　　(SSLSocket)sslFact createSocket(args length == ?

　　 : args[ ] );

　　String str[]=s getSupportedCipherSuites();

　　int len = str length;

　　String set[] = new String[len];

　　int j= k = len ;

　　for (int i= ; 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= ; 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_ _CBC_SHATLS_DHE_RSA_WITH_AES_ _CBC_SHATLS_DHE_DSS_WITH_AES_ _CBC_SHATLS_DH_anon_WITH_AES_ _CBC_SHASSL_DH_anon_EXPORT_WITH_DES _CBC_SHASSL_DH_anon_EXPORT_WITH_RC _ _MD SSL_DH_anon_WITH_DES_CBC_SHASSL_DH_anon_WITH_ DES_EDE_CBC_SHATLS_DH_anon_WITH_AES_ _CBC_SHASSL_DH_anon_WITH_RC _ _MD SSL_RSA_WITH_NULL_SHASSL_RSA_WITH_NULL_MD SSL_DHE_DSS_EXPORT_WITH_DES _CBC_SHASSL_DHE_RSA_EXPORT_WITH_DES _CBC_SHASSL_RSA_EXPORT_WITH_DES _CBC_SHASSL_RSA_EXPORT_WITH_RC _ _MD SSL_DHE_DSS_WITH_DES_CBC_SHASSL_DHE_RSA_WITH_DES_CBC_SHASSL_RSA_WITH_DES_CBC_SHASSL_DHE_DSS_WITH_ DES_EDE_CBC_SHASSL_DHE_RSA_WITH_ DES_EDE_CBC_SHASSL_RSA_WITH_ DES_EDE_CBC_SHATLS_DHE_DSS_WITH_AES_ _CBC_SHATLS_DHE_RSA_WITH_AES_ _CBC_SHATLS_RSA_WITH_AES_ _CBC_SHASSL_RSA_WITH_RC _ _SHASSL_RSA_WITH_RC _ _MD Using cipher suite: TLS_RSA_WITH_AES_ _CBC_SHA

　　别人的例子

　　Java代码

　　/**

　　*PrivateExmaple java

　　*Copyright

　　import javax crypto Cipher;

　　import javax crypto KeyGenerator;

　　import java security Key;

　　/**

　　*Ë&frac ;?&frac ;ÓÃÜ&&±&Ö¤Ï&Ï&&uÃÜÐÔ

　　public class PrivateExample

　　public static void main(String[] args) throws Exception

　　byte[] plainText= getBytes();

　　//Í‥&sup ;&KeyGeneratorÐÎ&sup ;ÉÒ&&&key

　　System out println( \\nStart generate AES key );

　　KeyGenerator keyGen=KeyGenerator getInstance( AES );

　　keyGen init( );

　　Key key=keyGen generateKey();

　　System out println( Finish generating AES key );

　　//&&&ÃÒ&&&Ë&frac ;?&frac ;ÓÃÜÀaCipher&&ECBÊÇ&frac ;ÓÃÜ·&frac ;Ê&frac ;&&PKCS PaddingÊÇÌ&&sup ;&·&frac ;·‥

　　Cipher cipher=Cipher getInstance( AES/ECB/PKCS Padding );

　　System out println( \\n +cipher getProvider() getInfo());

　　//Ê&sup ;ÓÃË&frac ;?&frac ;ÓÃÜ

　　System out println( \\nStart encryption: );

　　cipher init(Cipher ENCRYPT_MODE key);

　　byte[] cipherText=cipher doFinal(plainText);

　　System out println( Finish encryption: );

　　System out println(new String(cipherText UTF ));

　　System out println( \\nStart decryption: );

　　cipher init(Cipher DECRYPT_MODE key);

　　byte[] newPlainText=cipher doFinal(cipherText);

　　System out println( Finish decryption: );

　　System out println(new String(newPlainText UTF ));

　　/**

　　*PrivateExmaple java

　　*Copyright

　　import javax crypto Cipher;

　　import javax crypto KeyGenerator;

　　import java security Key;

　　/**

　　*Ë&frac ;?&frac ;ÓÃÜ&&±&Ö¤Ï&Ï&&uÃÜÐÔ

　　public class PrivateExample

　　public static void main(String[] args) throws Exception

　　byte[] plainText= getBytes();

　　//Í‥&sup ;&KeyGeneratorÐÎ&sup ;ÉÒ&&&key

　　System out println( \\nStart generate AES key );

　　KeyGenerator keyGen=KeyGenerator getInstance( AES );

　　keyGen init( );

　　Key key=keyGen generateKey();

　　System out println( Finish generating AES key );

　　//&&&ÃÒ&&&Ë&frac ;?&frac ;ÓÃÜÀaCipher&&ECBÊÇ&frac ;ÓÃÜ·&frac ;Ê&frac ;&&PKCS PaddingÊÇÌ&&sup ;&·&frac ;·‥

　　Cipher cipher=Cipher getInstance( AES/ECB/PKCS Padding );

　　System out println( \\n +cipher getProvider() getInfo());

　　//Ê&sup ;ÓÃË&frac ;?&frac ;ÓÃÜ

　　System out println( \\nStart encryption: );

　　cipher init(Cipher ENCRYPT_MODE key);

　　byte[] cipherText=cipher doFinal(plainText);

　　System out println( Finish encryption: );

　　System out println(new String(cipherText UTF ));

　　System out println( \\nStart decryption: );

　　cipher init(Cipher DECRYPT_MODE key);

　　byte[] newPlainText=cipher doFinal(cipherText);

　　System out println( Finish decryption: );

　　System out println(new String(newPlainText UTF ));

　　自己稍加修改的例子

　　Java代码

　　byte[] plainText= getBytes();

　　//Í‥&sup ;&KeyGeneratorÐÎ&sup ;ÉÒ&&&key

　　System out println( \\nStart generate AES key );

　　KeyGenerator keyGen=KeyGenerator getInstance( AES );

　　String pwd = passord ;

　　keyGen init( new SecureRandom(pwd getBytes()));

　　//keyGen init( );

　　//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&&&Ë&frac ;?&frac ;ÓÃÜÀaCipher&&ECBÊÇ&frac ;ÓÃÜ?E&frac ;Ê&frac ;&&PKCS PaddingÊÇÌ&&sup ;&?E&frac ;?E‥

　　Cipher cipher=Cipher getInstance( AES );

　　System out println( \\n +cipher getProvider() getInfo());

　　//Ê&sup ;ÓÃË&frac ;?&frac ;ÓÃÜ

　　System out println( \\nStart encryption: );

　　cipher init(Cipher ENCRYPT_MODE skeySpec);

　　byte[] cipherText=cipher doFinal(plainText);

　　System out println( Finish encryption: );

　　System out println(new String(cipherText UTF ));

　　System out println( \\nStart decryption: );

　　cipher init(Cipher DECRYPT_MODE skeySpec);

　　byte[] newPlainText=cipher doFinal(cipherText);

　　System out println( Finish decryption: );

　　System out println(new String(newPlainText UTF ));

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