来自bouncycastle RSAKeyParameters的Publickey
我有以下代码从字符串中读取CSR并以PEM格式输出公钥。 我还需要将公钥作为java RSAPublickey获取，但我无法弄清楚如何执行此操作。
import org.bouncycastle.crypto.params.RSAKeyParameters; import org.bouncycastle.crypto.util.PublicKeyFactory; import org.bouncycastle.pkcs.PKCS10CertificationRequest; import org.bouncycastle.util.io.pem.PemObject; import org.bouncycastle.util.io.pem.PemReader; import org.bouncycastle.util.io.pem.PemWriter; import java.io.*; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.PublicKey; import java.security.spec.InvalidKeySpecException; import java.security.spec.RSAPublicKeySpec; public class parseCSRfromString { String csrPEM = "-----BEGIN CERTIFICATE REQUEST-----\n" + "MIICwjCCAaoCAQAwfTELMAkGA1UEBhMCVVMxEDAOBgNVBAgTB0Zsb3JpZGExEzAR\n" + "BgNVBAcTCkJvY2EgUmF0b24xGzAZBgNVBAoTEkxvb25leSBUb29ucywgSW5jLjEU\n" + "MBIGA1UECxMLRGV2ZWxvcG1lbnQxFDASBgNVBAMTC2V4YW1wbGUuY29tMIIBIjAN\n" + "BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAiJCj31d1Rp+aKz/GTkedaiS/VSCc\n" + "PRARYgXukobjgBHx46HjldAcfg/DoANn5lEQaFxaIZJLbZ/AdLUyw/hUbU0CjWXv\n" + "pN3Ep3o9XgRTPkIFoI22VOI/O2ZLjBq/E4DWyVmv+vG6BK0LRh7hykzPCw6KIRR9\n" + "NCmUMJMQX5d5P/r1lR5H399pnLcLsrHoWDwBSEDgkGWyxnvEB0+/bIz42T3qnlFt\n" + "7avarxlHG2p5DoRTf8GJ+6imY88ZeBW/Nk18aDINsAHWLv383JICIAsZ3VuMk8m/\n" + "Z/Z5b21zIuZECDJjZjvAAjr/shVLB+Pck5+HJy6tqj79MJOQu+jKIrK8VwIDAQAB\n" + "oAAwDQYJKoZIhvcNAQEFBQADggEBAGtuAAHG4OC9jSRjGWSqfMXTDMz9tgekDREA\n" + "SYv5QIrOXsMzwbgDw8LxRJZEskl4JJOnjwEvUXWUF1M6XmG2h358nOnrkOlsumHw\n" + "Tx5gGSr6S6aJO/HG46erctE8aWpnFZYMfuEkul4ApsIufL7Bxqs3NHZWcrWBlLIP\n" + "aVCKx1FPRMC36Tj3EslbuUB/iTRt90Nfq1IxHMIKiwCiSNJSqfRVLANhI8MUbOjB\n" + "CBly1wcH68WWNkyvHVvbcF/B9AfYG9AqWjZjygKpyf81VZWctXhDc8UtomqrblXN\n" + "mvz4RKpIhZQLuuxlBrdzJkPm2sOdtdZghebCRRVWdjsig4sylgQ=\n" + "-----END CERTIFICATE REQUEST-----"; StringReader csrstring = new StringReader(csrPEM); PemReader pemReader = new PemReader(csrstring); public String readCSR() { String theKey = new String(); try { PKCS10CertificationRequest csr = new PKCS10CertificationRequest(pemReader.readPemObject().getContent()); pemReader.close(); // Write the Public Key as a PEM-File StringWriter output = new StringWriter(); PemWriter pemWriter = new PemWriter(output); PemObject pkPemObject = new PemObject("PUBLIC KEY", csr.getSubjectPublicKeyInfo().getEncoded()); pemWriter.writeObject(pkPemObject); pemWriter.close(); // System.out.println(output.getBuffer()); theKey = output.getBuffer().toString(); RSAKeyParameters pubkey = (RSAKeyParameters) PublicKeyFactory.createKey(csr.getSubjectPublicKeyInfo()); } catch (IOException e) { e.printStackTrace(); } return theKey; } }
使用RSAKeyParameters中的模数和指数构建公钥
RSAKeyParameters pubkey =... RSAPublicKeySpec spec = new RSAPublicKeySpec(pubkey.getModulus(), pubkey.getExponent()); KeyFactory factory = KeyFactory.getInstance("RSA"); PublicKey pub = factory.generatePublic(spec);