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java数字签名源代码 java 签名

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java如何对pdf文件实现数字签名用Spire.Docfor Java 可以添加及验证数字签名，参考代码：
import com.spire.pdf.*;
import com.spire.pdf.graphics.PdfImage;
import com.spire.pdf.graphics.PdfTrueTypeFont;
import com.spire.pdf.security.GraphicMode;
import com.spire.pdf.security.PdfCertificate;
import com.spire.pdf.security.PdfCertificationFlags;
import com.spire.pdf.security.PdfSignature;
import java.awt.*;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
public class AddCertificate {
public static void main(String[]args){
//加载PDF文档
PdfDocument doc = new PdfDocument();
doc.loadFromFile("test.pdf");
//加载pfx证书 ， 及证书秘钥
PdfCertificate cert = new PdfCertificate("Cermia.pfx","123654yes!");
//添加数字签名到指定页面，并设置其位置和大小
PdfSignature signature = new PdfSignature(doc, doc.getPages().get(2), cert, "MySignature");
Rectangle2D rect = new Rectangle2D.Float();
rect.setFrame(new Point2D.Float((float) doc.getPages().get(0).getActualSize().getWidth() - 340, (float) doc.getPages().get(0).getActualSize().getHeight() - 230), new Dimension(280, 150));
signature.setBounds(rect);
//设置签名为图片加文本模式
signature.setGraphicMode(GraphicMode.Sign_Image_And_Sign_Detail);
//设置签名的内容
signature.setNameLabel("签字者：");
signature.setName("Mia");
signature.setContactInfoLabel("联系电话：");
signature.setContactInfo("02881705109");
signature.setDateLabel("日期：");
signature.setDate(new java.util.Date());
signature.setLocationInfoLabel("地点：");
signature.setLocationInfo("成都");
signature.setReasonLabel("原因：");
signature.setReason("文档所有者");
signature.setDistinguishedNameLabel("DN: ");
signature.setDistinguishedName(signature.getCertificate().get_IssuerName().getName());
signature.setSignImageSource(PdfImage.fromFile("sign.png"));
//设置签名的字体
signature.setSignDetailsFont(new PdfTrueTypeFont(new Font("Arial Unicode MS", Font.PLAIN, 9)));
//设置文档权限为禁止更改
signature.setDocumentPermissions(PdfCertificationFlags.Forbid_Changes);
signature.setCertificated(true);
//保存文档
doc.saveToFile("AddSignature.pdf");
doc.close();
}
}
数字签名添加效果：
数字签名效果
参考原文
求ECDSA的Java代码【方案1】
package ECDSA;
import com.sun.org.apache.xerces.internal.impl.dv.util.HexBin;
import java.security.*;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class Ecdsa {
private static String src = "https://www.04ip.com/post/hello berber" ;
public static void main(String []args){
jdkECDSA();
}
public static void jdkECDSA(){
// 1.初始化密钥
try{
KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
keyPairGenerator.initialize(256);
KeyPair keyPair = keyPairGenerator.generateKeyPair() ;
ECPublicKey ecPublicKey = (ECPublicKey)keyPair.getPublic() ;
ECPrivateKey ecPrivateKey = (ECPrivateKey)keyPair.getPrivate() ;
// 执行签名
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());
KeyFactory keyFactory = KeyFactory.getInstance("EC") ;
PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec) ;
Signature signature = Signature.getInstance("SHA1withECDSA");
signature.initSign(privateKey);
signature.update(src.getBytes());
byte []arr = signature.sign();
System.out.println("jdk ecdsa sign :"+ HexBin.encode(arr));

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