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1、用java實(shí)現(xiàn)RSA加密java實(shí)現(xiàn)RSA加密流程分析：1、甲方構(gòu)建密鑰對(duì)兒，將公鑰公布給乙方，將私鑰保留。2、甲方使用私鑰加密數(shù)據(jù)，然后用私鑰對(duì)加密后的數(shù)據(jù)簽名，發(fā)送給乙方簽名以及加密后的數(shù)據(jù)；乙方使用公鑰、簽名來驗(yàn)證待解密數(shù)據(jù)是否有效，如果有效使用公鑰對(duì)數(shù)據(jù)解密。3、乙方使用公鑰加密數(shù)據(jù)，向甲方發(fā)送經(jīng)過加密后的數(shù)據(jù)；甲方獲得加密數(shù)據(jù)，通過私鑰解密。通過java代碼實(shí)現(xiàn)如下：importjava.security.Key;importjava.security.KeyFactory;importjava.security.KeyPair;importjava.security.Key
2、PairGenerator;importjava.security.PrivateKey;importjava.security.PublicKey;importjava.security.Signature;importjava.security.interfaces.RSAPrivateKey;importjava.security.interfaces.RSAPublicKey;importjava.security.spec.PKCS8EncodedKeySpec;importjava.security.spec.X509EncodedKeySpec;importjava.ut
3、il.HashMap;importjava.util.Map;importjavax.crypto.Cipher;/***//***RSA安全編碼組件**@version1.0*@since1.0*/publicabstractclassRSACoderextendsCoder{publicstaticfinalStringKEY_ALGORITHM="RSA";publicstaticfinalStringSIGNATURE_ALGORITHM="MD5withRSA";privatestaticfinalStringPUBLIC_KEY="RSAPublicKey";private
4、staticfinalStringPRIVATE_KEY="RSAPrivateKey";/***//***用私鑰對(duì)信息生成數(shù)字簽名**@paramdata*加密數(shù)據(jù)*@paramprivateKey*私鑰**@return*@throwsException*/publicstaticStringsign(byte[]data,StringprivateKey)throwsException{//解密由base64編碼的私鑰byte[]keyBytes=decryptBASE64(privateKey);//構(gòu)造PKCS8EncodedKeySpec對(duì)象PKCS8EncodedKeyS
5、pecpkcs8KeySpec=newPKCS8EncodedKeySpec(keyBytes);//KEY_ALGORITHM指定的加密算法KeyFactorykeyFactory=KeyFactory.getInstance(KEY_ALGORITHM);//取私鑰匙對(duì)象PrivateKeypriKey=keyFactory.generatePrivate(pkcs8KeySpec);//用私鑰對(duì)信息生成數(shù)字簽名Signaturesignature=Signature.getInstance(SIGNATURE_ALGORITHM);signature.initSign(priKe
6、y);signature.update(data);returnencryptBASE64(signature.sign());}/***//***校驗(yàn)數(shù)字簽名**@paramdata*加密數(shù)據(jù)*@parampublicKey*公鑰*@paramsign*數(shù)字簽名**@return校驗(yàn)成功返回true失敗返回false*@throwsException**/publicstaticbooleanverify(byte[]data,StringpublicKey,Stringsign)throwsE//解密由base64編碼的公鑰byte[]keyBytes=decryptBASE64(
7、publicKey);//構(gòu)造X509EncodedKeySpec對(duì)象X509EncodedKeySpeckeySpec=newX509EncodedKeySpec(keyBytes);//KEY_ALGORITHM指定的加密算法KeyFactorykeyFactory=KeyFactory.getInstance(KEY_ALGORITHM);//取公鑰匙對(duì)象PublicKeypubKey=keyFactory.generatePublic(
