Java如何验证签名数据的数字签名？
在此示例中，我们将学习如何验证先前签名数据的数字签名。要对数据签名，您可以在这篇文章中看到前面的示例。如何创建数字签名和数据签名？
这里的代码片段：
package org.nhooo.example.security;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
public class VerifyDigitalSignature {
public static void main(String[] args) {
try {
byte[] publicKeyEncoded = Files.readAllBytes(Paths.get("publickey"));
byte[] digitalSignature = Files.readAllBytes(Paths.get("signature"));
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyEncoded);
KeyFactory keyFactory = KeyFactory.getInstance("DSA", "SUN");
PublicKey publicKey = keyFactory.generatePublic(publicKeySpec);
Signature signature = Signature.getInstance("SHA1withDSA", "SUN");
signature.initVerify(publicKey);
byte[] bytes = Files.readAllBytes(Paths.get("README"));
signature.update(bytes);
boolean verified = signature.verify(digitalSignature);
if (verified) {
System.out.println("Data verified.");
} else {
System.out.println("Cannot verify data.");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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