我有一个RSA密钥和一个X.509证书,我用它来进行SSL连接。
密钥和证书以PEM格式存储在文件中(由OpenSSL生成),并在Apache HTTP服务器环境中使用。
是否有一种简单的方法来验证密钥是否仅使用Java代码与证书匹配(不执行openssl二进制文件并解析输出),例如使用Java安全性和/或Bouncycastle库方法?
答案 0 :(得分:3)
以下代码将SHA-1与公钥和私钥内的模数进行比较。模数对于每一对都应该是唯一的(除非您密钥对生成机制或随机生成器当然被破坏)。
请注意,以下代码要求密钥采用未加密的PKCS#8格式。最好使用PKCS#12,并在KeyStore中加载二进制PKCS#12文件(提供密码)。
openssl pkcs8 -topk8 -in key.pem -out keypk8.pem -nocrypt
最后是Java代码:
import static org.bouncycastle.util.encoders.Hex.toHexString;
import java.io.ByteArrayInputStream;
import java.io.FileReader;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.KeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
public class CompareCertAndKey {
/**
* Checks if the certificate and RSA private key match.
*
* @param args the path to the certificate file in args[0] and that of the private key in args[1]
*/
public static void main(String[] args) {
try {
final PemReader certReader = new PemReader(new FileReader(args[0]));
final PemObject certAsPemObject = certReader.readPemObject();
if (!certAsPemObject.getType().equalsIgnoreCase("CERTIFICATE")) {
throw new IllegalArgumentException("Certificate file does not contain a certificate but a " + certAsPemObject.getType());
}
final byte[] x509Data = certAsPemObject.getContent();
final CertificateFactory fact = CertificateFactory.getInstance("X509");
final Certificate cert = fact.generateCertificate(new ByteArrayInputStream(x509Data));
if (!(cert instanceof X509Certificate)) {
throw new IllegalArgumentException("Certificate file does not contain an X509 certificate");
}
final PublicKey publicKey = cert.getPublicKey();
if (!(publicKey instanceof RSAPublicKey)) {
throw new IllegalArgumentException("Certificate file does not contain an RSA public key but a " + publicKey.getClass().getName());
}
final RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey;
final byte[] certModulusData = rsaPublicKey.getModulus().toByteArray();
final MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
final byte[] certID = sha1.digest(certModulusData);
final String certIDinHex = toHexString(certID);
final PemReader keyReader = new PemReader(new FileReader(args[1]));
final PemObject keyAsPemObject = keyReader.readPemObject();
if (!keyAsPemObject.getType().equalsIgnoreCase("PRIVATE KEY")) {
throw new IllegalArgumentException("Key file does not contain a private key but a " + keyAsPemObject.getType());
}
final byte[] privateKeyData = keyAsPemObject.getContent();
final KeyFactory keyFact = KeyFactory.getInstance("RSA");
final KeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyData);
final PrivateKey privateKey = keyFact.generatePrivate(keySpec);
if (!(privateKey instanceof RSAPrivateKey)) {
throw new IllegalArgumentException("Key file does not contain an X509 encoded private key");
}
final RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) privateKey;
final byte[] keyModulusData = rsaPrivateKey.getModulus().toByteArray();
final byte[] keyID = sha1.digest(keyModulusData);
final String keyIDinHex = toHexString(keyID);
System.out.println(args[0] + " : " + certIDinHex);
System.out.println(args[1] + " : " + keyIDinHex);
if (certIDinHex.equalsIgnoreCase(keyIDinHex)) {
System.out.println("Match");
System.exit(0);
} else {
System.out.println("No match");
System.exit(-1);
}
} catch (Exception e) {
e.printStackTrace(System.err);
System.exit(-2);
}
}
}
答案 1 :(得分:1)
非常感谢上面的代码片段。它适用于bouncycastle版本1.51
<bcprov-jdk15on-version>1.51</bcprov-jdk15on-version>
<dependency>
<groupId>org.bouncycastle</groupId>
<artifactId>bcprov-jdk15on</artifactId>
<version>${bcprov-jdk15on-version}</version>
</dependency>
非常感谢您的代码段。