在 JAVA 中使用 PKCS #7 对数据进行签名
我想签署一个文本文件(将来可能是 .exe
文件或其他文件)使用 PKCS#7 并使用 Java 验证签名.
I want to sign a text file (may be a .exe
file or something else in the future)
using PKCS#7 and verify the signature using Java.
- 我需要知道什么?
- 在哪里可以找到 API(
.jar
和文档)? - 为了签署数据和验证数据,我需要执行哪些步骤?
如果可能,请提供代码片段.
Please provide me code snippet if possible.
推荐答案
我认为您需要以下 2 个 Bouncy Castle jar 来生成 PKCS7 数字签名:
I reckon you need the following 2 Bouncy Castle jars to generate the PKCS7 digital signature:
bcprov-jdk15on-147.jar(适用于 JDK 1.5 - JDK 1.7)
bcprov-jdk15on-147.jar (for JDK 1.5 - JDK 1.7)
bcmail-jdk15on-147.jar(适用于 JDK 1.5 - JDK 1.7)
bcmail-jdk15on-147.jar (for JDK 1.5 - JDK 1.7)
您可以从这里下载充气城堡罐子.
You can download the Bouncy Castle jars from here.
您需要使用公共 & 设置您的密钥库.私钥对.您只需要私钥即可生成数字签名 &验证它的公钥.
You need to setup your keystore with the public & private key pair. You need only the private key to generate the digital signature & the public key to verify it.
以下是您对 pkcs7 内容进行签名的方式(为简洁起见,省略了异常处理):
Here's how you'd pkcs7 sign content (Exception handling omitted for brevity) :
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.PrivateKey;
import java.security.Security;
import java.security.cert.Certificate;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import org.bouncycastle.cert.jcajce.JcaCertStore;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.Store;
import org.bouncycastle.util.encoders.Base64;
public final class PKCS7Signer {
private static final String PATH_TO_KEYSTORE = "/path/to/keyStore";
private static final String KEY_ALIAS_IN_KEYSTORE = "My_Private_Key";
private static final String KEYSTORE_PASSWORD = "MyPassword";
private static final String SIGNATUREALGO = "SHA1withRSA";
public PKCS7Signer() {
}
KeyStore loadKeyStore() throws Exception {
KeyStore keystore = KeyStore.getInstance("JKS");
InputStream is = new FileInputStream(PATH_TO_KEYSTORE);
keystore.load(is, KEYSTORE_PASSWORD.toCharArray());
return keystore;
}
CMSSignedDataGenerator setUpProvider(final KeyStore keystore) throws Exception {
Security.addProvider(new BouncyCastleProvider());
Certificate[] certchain = (Certificate[]) keystore.getCertificateChain(KEY_ALIAS_IN_KEYSTORE);
final List<Certificate> certlist = new ArrayList<Certificate>();
for (int i = 0, length = certchain == null ? 0 : certchain.length; i < length; i++) {
certlist.add(certchain[i]);
}
Store certstore = new JcaCertStore(certlist);
Certificate cert = keystore.getCertificate(KEY_ALIAS_IN_KEYSTORE);
ContentSigner signer = new JcaContentSignerBuilder(SIGNATUREALGO).setProvider("BC").
build((PrivateKey) (keystore.getKey(KEY_ALIAS_IN_KEYSTORE, KEYSTORE_PASSWORD.toCharArray())));
CMSSignedDataGenerator generator = new CMSSignedDataGenerator();
generator.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().setProvider("BC").
build()).build(signer, (X509Certificate) cert));
generator.addCertificates(certstore);
return generator;
}
byte[] signPkcs7(final byte[] content, final CMSSignedDataGenerator generator) throws Exception {
CMSTypedData cmsdata = new CMSProcessableByteArray(content);
CMSSignedData signeddata = generator.generate(cmsdata, true);
return signeddata.getEncoded();
}
public static void main(String[] args) throws Exception {
PKCS7Signer signer = new PKCS7Signer();
KeyStore keyStore = signer.loadKeyStore();
CMSSignedDataGenerator signatureGenerator = signer.setUpProvider(keyStore);
String content = "some bytes to be signed";
byte[] signedBytes = signer.signPkcs7(content.getBytes("UTF-8"), signatureGenerator);
System.out.println("Signed Encoded Bytes: " + new String(Base64.encode(signedBytes)));
}
}
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