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Bouncy Castle Crypto APIs 是一個開源的輕量級Java 加密解密包，實現了JCE/JCA的provider，支持AES等多種加密解密算法。
詳情請見主頁：http://www.bouncycastle.org/java.html
本文的示例代碼使用了http://www.bouncycastle.org/download/bcprov-jdk16-139.jar
1）使用JCE的AES-128-CBC加密解密

Java代碼 ?

package ?com.albertsong.aes;??
??
import ?java.security.Key;??
import ?java.security.Security;??
??
import ?javax.crypto.Cipher;??
import ?javax.crypto.spec.IvParameterSpec;??
import ?javax.crypto.spec.SecretKeySpec;??
??
import ?org.bouncycastle.jce.provider.BouncyCastleProvider;??
import ?org.bouncycastle.util.encoders.Hex;??
??
/** ?
?*?@author?Albert ?
?*?@version?1.0 ?
?*? ?
?*/ ??
public ? class ?AESWithJCE?{??
??
???? /** ?
?????*?@param?args ?
?????*/ ??
???? public ? static ? void ?main(String[]?args)?{??
???????? byte []?keybytes?=?{? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ,??
???????????????? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ?};??
???????? byte []?iv?=?{? 0x38 ,? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ,? 0x38 ,??
???????????????? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ?};??
????????String?content?= "TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ" ;??
????????System.out.println( "Original?content:" );??
????????System.out.println(content);??
???????? try ?{??
????????????Security.addProvider( new ?BouncyCastleProvider());??
????????????Key?key?=? new ?SecretKeySpec(keybytes,? "AES" );??
????????????Cipher?in?=?Cipher.getInstance( "AES/CBC/PKCS7Padding" , "BC" );??
????????????in.init(Cipher.ENCRYPT_MODE,?key,? new ?IvParameterSpec(iv));??
???????????? byte []?enc?=?in.doFinal(content.getBytes());??
????????????System.out.println( "Encrypted?Content:" );??
????????????System.out.println( new ?String(Hex.encode(enc)));??
??????????????
????????????Cipher?out?=?Cipher.getInstance( "AES/CBC/PKCS7Padding" ,? "BC" );??
????????????out.init(Cipher.DECRYPT_MODE,?key,? new ?IvParameterSpec(iv));??
???????????? byte []?dec?=?out.doFinal(enc);??
????????????System.out.println( "Decrypted?Content:" );??
????????????System.out.println( new ?String(dec));??
????????}? catch ?(Exception?ex)?{??
????????????ex.printStackTrace();??
????????}??
??
????}??
??
}??

?2）不使用JCE的AES-128-CBC加密解密，可以用于J2ME程序中。

Java代碼 ?

package ?com.albertsong.aes;??
??
import ?org.bouncycastle.crypto.BufferedBlockCipher;??
import ?org.bouncycastle.crypto.engines.AESFastEngine;??
import ?org.bouncycastle.crypto.modes.CBCBlockCipher;??
import ?org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;??
import ?org.bouncycastle.crypto.params.KeyParameter;??
import ?org.bouncycastle.crypto.params.ParametersWithIV;??
import ?org.bouncycastle.util.encoders.Hex;??
??
/** ?
?*?@author?Albert ?
?*?@version?1.0 ?
?* ?
?*/ ??
public ? class ?AESWithoutJCE?{??
??
???? /** ?
?????*?@param?args ?
?????*/ ??
???? public ? static ? void ?main(String[]?args)?{??
???????? byte []?keybytes?=?{? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ,??
???????????????? 0x31 ,? 0x32 ,? 0x33 ,? 0x34 ,? 0x35 ,? 0x36 ,? 0x37 ,? 0x38 ?};??
???????? byte []?iv?=?{? 0x38 ,? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ,? 0x38 ,??
???????????????? 0x37 ,? 0x36 ,? 0x35 ,? 0x34 ,? 0x33 ,? 0x32 ,? 0x31 ?};??
????????String?content?= "TEST1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ" ;??
????????System.out.println( "Original?content:" );??
????????System.out.println(content);??
???????? try ?{??
????????????BufferedBlockCipher?engine?=? new ?PaddedBufferedBlockCipher( new ?CBCBlockCipher( new ?AESFastEngine()));??
????????????engine.init( true ,? new ?ParametersWithIV( new ?KeyParameter(keybytes),iv));??
???????????? byte []?enc?=? new ? byte [engine.getOutputSize(content.getBytes().length)];??
???????????? int ?size1?=?engine.processBytes(content.getBytes(),? 0 ,?content.getBytes().length,?enc,? 0 );??
???????????? int ?size2?=?engine.doFinal(enc,?size1);??
????????????System.out.println( "size2?=" +size2);??
???????????? byte []?encryptedContent?= new ? byte [size1+size2];??
????????????System.arraycopy(enc,? 0 ,?encryptedContent,? 0 ,?encryptedContent.length);??
????????????System.out.println( "Encrypted?Content:" );??
????????????System.out.println( new ?String(Hex.encode(encryptedContent)));??
??????????????
??????????????
????????????engine.init( false ,? new ?ParametersWithIV( new ?KeyParameter(keybytes),iv));??
???????????? byte []?dec?=? new ? byte [engine.getOutputSize(encryptedContent.length)];??
????????????size1?=?engine.processBytes(encryptedContent,? 0 ,?encryptedContent.length,?dec,? 0 );??
????????????size2?=?engine.doFinal(dec,?size1);??
????????????System.out.println( "size2?=" +size2);??
???????????? byte []?decryptedContent?= new ? byte [size1+size2];??
????????????System.arraycopy(dec,? 0 ,?decryptedContent,? 0 ,?decryptedContent.length);??
????????????System.out.println( "Decrypted?Content:" );??
????????????System.out.println( new ?String(decryptedContent));??
??
????????}? catch ?(Exception?ex)?{??
????????????ex.printStackTrace();??
????????}??
??
????}??
??
}?

用Bouncy Castle實現AES-128-CBC加密解密

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