java 数字信封_【Java密码学】使用Bouncy Castle生成数字签名、数字信封

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importjava.io.FileInputStream;importjava.io.InputStream;importjava.security.KeyStore;importjava.security.PrivateKey;importjava.security.Provider;importjava.security.Security;importjava.security.cert.Certificate;importjava.security.cert.CertificateFactory;importjava.security.cert.X509Certificate;importjava.util.ArrayList;importjava.util.Collection;importjava.util.Iterator;importjava.util.List;importorg.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;importorg.bouncycastle.cert.X509CertificateHolder;importorg.bouncycastle.cert.jcajce.JcaCertStore;importorg.bouncycastle.cms.CMSEnvelopedData;importorg.bouncycastle.cms.CMSEnvelopedDataGenerator;importorg.bouncycastle.cms.CMSProcessableByteArray;importorg.bouncycastle.cms.CMSSignedData;importorg.bouncycastle.cms.CMSSignedDataGenerator;importorg.bouncycastle.cms.CMSTypedData;importorg.bouncycastle.cms.RecipientInformation;importorg.bouncycastle.cms.RecipientInformationStore;importorg.bouncycastle.cms.SignerInformation;importorg.bouncycastle.cms.SignerInformationStore;importorg.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;importorg.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;importorg.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;importorg.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;importorg.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;importorg.bouncycastle.jce.provider.BouncyCastleProvider;importorg.bouncycastle.operator.ContentSigner;importorg.bouncycastle.operator.jcajce.JcaContentSignerBuilder;importorg.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;importorg.bouncycastle.util.Store;importorg.bouncycastle.util.encoders.Base64;public classMessageUtil {private String ksType = “PKCS12”;/*** 生成数字签名

*@paramsrcMsg 源信息

*@paramcharSet 字符编码

*@paramcertPath 证书路径

*@paramcertPwd 证书密码

*@return

*/

public byte[] signMessage(String srcMsg, String charSet, String certPath, String certPwd) {

String priKeyName= null;char passphrase[] =certPwd.toCharArray();try{

Provider provider= newBouncyCastleProvider();//添加BouncyCastle作为安全提供

Security.addProvider(provider);//加载证书

KeyStore ks =KeyStore.getInstance(ksType);

ks.load(newFileInputStream(certPath), passphrase);if(ks.aliases().hasMoreElements()) {

priKeyName=ks.aliases().nextElement();

}

Certificate cert=(Certificate) ks.getCertificate(priKeyName);//获取私钥

PrivateKey prikey =(PrivateKey) ks.getKey(priKeyName, passphrase);

X509Certificate cerx509=(X509Certificate) cert;

List certList = new ArrayList();

certList.add(cerx509);

CMSTypedData msg= (CMSTypedData) newCMSProcessableByteArray(

srcMsg.getBytes(charSet));

Store certs= newJcaCertStore(certList);

CMSSignedDataGenerator gen= newCMSSignedDataGenerator();

ContentSigner sha1Signer= newJcaContentSignerBuilder(“SHA1withRSA”).setProvider(“BC”).build(prikey);

gen.addSignerInfoGenerator(newJcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider(“BC”)

.build()).build(sha1Signer, cerx509));

gen.addCertificates(certs);

CMSSignedData sigData= gen.generate(msg, true);returnBase64.encode(sigData.getEncoded());

}catch(Exception e) {

e.printStackTrace();return null;

}

}/*** 验证数字签名

*@paramsignedData

*@return

*/

public boolean signedDataVerify(byte[] signedData) {boolean verifyRet = true;try{//新建PKCS#7签名数据处理对象

CMSSignedData sign = newCMSSignedData(signedData);//添加BouncyCastle作为安全提供

Security.addProvider(neworg.bouncycastle.jce.provider.BouncyCastleProvider());//获得证书信息

Store certs =sign.getCertificates();//获得签名者信息

SignerInformationStore signers =sign.getSignerInfos();

Collection c=signers.getSigners();

Iterator it=c.iterator();//当有多个签名者信息时需要全部验证

while(it.hasNext()) {

SignerInformation signer=(SignerInformation) it.next();//证书链

Collection certCollection =certs.getMatches(signer.getSID());

Iterator certIt=certCollection.iterator();

X509CertificateHolder cert=(X509CertificateHolder) certIt

.next();//验证数字签名

if (signer.verify(newJcaSimpleSignerInfoVerifierBuilder()

.setProvider(“BC”).build(cert))) {

verifyRet= true;

}else{

verifyRet= false;

}

}

}catch(Exception e) {

verifyRet= false;

e.printStackTrace();

System.out.println(“验证数字签名失败”);

}returnverifyRet;

}/*** 加密数据

*@paramsrcMsg 源信息

*@paramcertPath 证书路径

*@paramcharSet 字符编码

*@return*@throwsException*/

public String envelopeMessage(String srcMsg, String certPath, String charSet) throwsException {

CertificateFactory certificatefactory;

X509Certificate cert;//使用公钥对对称密钥进行加密//若此处不加参数 “BC” 会报异常：CertificateException –

certificatefactory = CertificateFactory.getInstance(“X.509”, “BC”);//读取.crt文件；你可以读取绝对路径文件下的crt，返回一个InputStream(或其子类)即可。

InputStream bais = newFileInputStream(certPath);

cert=(X509Certificate) certificatefactory.generateCertificate(bais);//添加数字信封

CMSTypedData msg = newCMSProcessableByteArray(srcMsg.getBytes(charSet));

CMSEnvelopedDataGenerator edGen= newCMSEnvelopedDataGenerator();

edGen.addRecipientInfoGenerator(newJceKeyTransRecipientInfoGenerator(

cert).setProvider(“BC”));

CMSEnvelopedData ed=edGen.generate(msg,newJceCMSContentEncryptorBuilder(PKCSObjectIdentifiers.rc4)

.setProvider(“BC”).build());

String rslt= newString(Base64.encode(ed.getEncoded()));

System.out.println(rslt);returnrslt;

}/*** 解密数据

*@paramencode 加密后的密文

*@paramcertPath 证书路径

*@paramcertPwd 证书密码

*@paramcharSet 字符编码

*@return*@throwsException*/

public String openEnvelope(String encode, String certPath, String certPwd, String charSet) throwsException {//获取密文

CMSEnvelopedData ed = newCMSEnvelopedData(Base64.decode(encode.getBytes()));

RecipientInformationStore recipients=ed.getRecipientInfos();

Collection c=recipients.getRecipients();

Iterator it=c.iterator();//加载证书

KeyStore ks =KeyStore.getInstance(ksType);

ks.load(newFileInputStream(certPath), certPwd.toCharArray());

String priKeyName= null;if(ks.aliases().hasMoreElements()) {

priKeyName=ks.aliases().nextElement();

}//获取私钥

PrivateKey prikey =(PrivateKey) ks.getKey(priKeyName, certPwd.toCharArray());byte[] recData = null;//解密

if(it.hasNext()) {

RecipientInformation recipient=(RecipientInformation) it.next();

recData= recipient.getContent(newJceKeyTransEnvelopedRecipient(

prikey).setProvider(“BC”));

}return newString(recData, charSet);

}publicMessageUtil() {

Security.addProvider(neworg.bouncycastle.jce.provider.BouncyCastleProvider());

}

}

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