将RSA PublicKey XML转换为PEM格式的步骤如下:
javax.xml.crypto.KeySelector
类来实现。具体代码如下:import javax.xml.crypto.KeySelector;
import javax.xml.crypto.dom.DOMStructure;
import javax.xml.crypto.dsig.keyinfo.KeyInfo;
import javax.xml.crypto.dsig.keyinfo.KeyValue;
import javax.xml.crypto.dsig.keyinfo.X509Data;
import javax.xml.crypto.dsig.keyinfo.X509IssuerSerial;
import javax.xml.crypto.dsig.keyinfo.X509SKI;
import javax.xml.crypto.dsig.keyinfo.X509SubjectName;
import javax.xml.crypto.dsig.keyinfo.X509Certificate;
import javax.xml.crypto.dsig.XMLSignatureFactory;
import javax.xml.crypto.dsig.XMLValidateContext;
import javax.xml.crypto.dsig.dom.DOMValidateContext;
import javax.xml.crypto.dsig.Reference;
import javax.xml.crypto.dsig.SignatureMethod;
import javax.xml.crypto.dsig.SignedInfo;
import javax.xml.crypto.dsig.Transform;
import javax.xml.crypto.dsig.XMLSignature;
import javax.xml.crypto.dsig.XMLSignatureException;
import javax.xml.crypto.dsig.XMLSignatureFactory;
import javax.xml.crypto.dsig.XMLValidateContext;
import javax.xml.crypto.dsig.dom.DOMValidateContext;
import javax.xml.crypto.dsig.keyinfo.KeyInfo;
import javax.xml.crypto.dsig.keyinfo.KeyValue;
import javax.xml.crypto.dsig.keyinfo.X509Data;
import javax.xml.crypto.dsig.keyinfo.X509IssuerSerial;
import javax.xml.crypto.dsig.keyinfo.X509SKI;
import javax.xml.crypto.dsig.keyinfo.X509SubjectName;
import javax.xml.crypto.dsig.keyinfo.X509Certificate;
import javax.xml.crypto.dsig.spec.TransformParameterSpec;
import javax.xml.crypto.dsig.spec.XPathFilterParameterSpec;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.spec.X509EncodedKeySpec;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class RSAKeyConverter {
public static void main(String[] args) throws Exception {
// 加载XML格式的PublicKey
String xmlPublicKey = "<RSAKeyValue><Modulus>...</Modulus><Exponent>...</Exponent></RSAKeyValue>";
PublicKey publicKey = loadPublicKeyFromXml(xmlPublicKey);
// 转换为PEM格式
String pemPublicKey = convertToPem(publicKey);
System.out.println(pemPublicKey);
}
private static PublicKey loadPublicKeyFromXml(String xmlPublicKey) throws Exception {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
InputStream is = new ByteArrayInputStream(xmlPublicKey.getBytes());
Document doc = dbf.newDocumentBuilder().parse(is);
// 创建XMLSignatureFactory实例
XMLSignatureFactory fac = XMLSignatureFactory.getInstance("DOM");
// 创建KeySelector
KeySelector selector = KeySelector.singletonKeySelector(publicKey);
// 创建XMLValidateContext
XMLValidateContext valContext = new DOMValidateContext(selector, doc);
// 验证XMLSignature
NodeList nl = doc.getElementsByTagNameNS(XMLSignature.XMLNS, "Signature");
if (nl.getLength() == 0) {
throw new Exception("Cannot find Signature element");
}
// 验证XMLSignature
XMLSignature signature = fac.unmarshalXMLSignature(valContext);
boolean coreValidity = signature.validate(valContext);
if (coreValidity) {
// 获取PublicKey
KeyInfo keyInfo = signature.getKeyInfo();
KeyValue keyValue = keyInfo.itemKeyValue(0);
return keyValue.getPublicKey();
} else {
throw new Exception("Signature failed core validation");
}
}
private static String convertToPem(PublicKey publicKey) throws Exception {
// 获取PublicKey的字节数组
byte[] publicKeyBytes = publicKey.getEncoded();
// 创建X509EncodedKeySpec实例
X509EncodedKeySpec spec = new X509EncodedKeySpec(publicKeyBytes);
// 创建KeyFactory实例
KeyFactory kf = KeyFactory.getInstance("RSA");
// 生成PEM格式的公钥
String pemPublicKey = "-----BEGIN PUBLIC KEY-----\n";
pemPublicKey += Base64.getEncoder().encodeToString(spec.getEncoded()) + "\n";
pemPublicKey += "-----END PUBLIC KEY-----";
return pemPublicKey;
}
}
请注意,以上代码中使用了Java的javax.xml.crypto
和java.security
包,因此需要确保您的开发环境中已经包含了这些包。
此外,腾讯云提供了一系列与云计算相关的产品,包括云服务器、云数据库、云存储等。您可以根据具体需求选择适合的产品。更多关于腾讯云产品的信息,请参考腾讯云官方网站:https://cloud.tencent.com/
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