如何从网站导出公钥，参见：
/*
* Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.
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* notice, this list of conditions and the following disclaimer in the
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* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.KeyStore;
import java.security.MessageDigest;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLException;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;
public class InstallCert {
public static void main(String[] args) throws Exception {
String host;
int port;
char[] passphrase;
if ((args.length == 1) || (args.length == 2)) {
String[] c = args[0].split(":");
host = c[0];
port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
String p = (args.length == 1) ? "changeit" : args[1];
passphrase = p.toCharArray();
} else {
System.out
.println("Usage: java InstallCert <host>[:port] [passphrase]");
return;
}
File file = new File("jssecacerts");
if (file.isFile() == false) {
char SEP = File.separatorChar;
File dir = new File(System.getProperty("java.home") + SEP + "lib"
+ SEP + "security");
file = new File(dir, "jssecacerts");
if (file.isFile() == false) {
file = new File(dir, "cacerts");
}
}
System.out.println("Loading KeyStore " + file + "...");
InputStream in = new FileInputStream(file);
KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
ks.load(in, passphrase);
in.close();
SSLContext context = SSLContext.getInstance("TLS");
TrustManagerFactory tmf = TrustManagerFactory
.getInstance(TrustManagerFactory.getDefaultAlgorithm());
tmf.init(ks);
X509TrustManager defaultTrustManager = (X509TrustManager) tmf
.getTrustManagers()[0];
SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
context.init(null, new TrustManager[] { tm }, null);
SSLSocketFactory factory = context.getSocketFactory();
System.out
.println("Opening connection to " + host + ":" + port + "...");
SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
socket.setSoTimeout(10000);
try {
System.out.println("Starting SSL handshake...");
socket.startHandshake();
socket.close();
System.out.println();
System.out.println("No errors, certificate is already trusted");
} catch (SSLException e) {
System.out.println();
e.printStackTrace(System.out);
}
X509Certificate[] chain = tm.chain;
if (chain == null) {
System.out.println("Could not obtain server certificate chain");
return;
}
BufferedReader reader = new BufferedReader(new InputStreamReader(
System.in));
System.out.println();
System.out.println("Server sent " + chain.length + " certificate(s):");
System.out.println();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
MessageDigest md5 = MessageDigest.getInstance("MD5");
for (int i = 0; i < chain.length; i++) {
X509Certificate cert = chain[i];
System.out.println(" " + (i + 1) + " Subject "
+ cert.getSubjectDN());
System.out.println(" Issuer " + cert.getIssuerDN());
sha1.update(cert.getEncoded());
System.out.println(" sha1 " + toHexString(sha1.digest()));
md5.update(cert.getEncoded());
System.out.println(" md5 " + toHexString(md5.digest()));
System.out.println();
}
System.out
.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
String line = reader.readLine().trim();
int k;
try {
k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
} catch (NumberFormatException e) {
System.out.println("KeyStore not changed");
return;
}
X509Certificate cert = chain[k];
String alias = host + "-" + (k + 1);
ks.setCertificateEntry(alias, cert);
OutputStream out = new FileOutputStream("证书名称");
ks.store(out, passphrase);
out.close();
System.out.println();
System.out.println(cert);
System.out.println();
System.out
.println("Added certificate to keystore 'jssecacerts' using alias '"
+ alias + "'");
}
private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
private static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(bytes.length * 3);
for (int b : bytes) {
b &= 0xff;
sb.append(HEXDIGITS[b >> 4]);
sb.append(HEXDIGITS[b & 15]);
sb.append(' ');
}
return sb.toString();
}
private static class SavingTrustManager implements X509TrustManager {
private final X509TrustManager tm;
private X509Certificate[] chain;
SavingTrustManager(X509TrustManager tm) {
this.tm = tm;
}
public X509Certificate[] getAcceptedIssuers() {
throw new UnsupportedOperationException();
}
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
throw new UnsupportedOperationException();
}
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
this.chain = chain;
tm.checkServerTrusted(chain, authType);
}
}
}
编译InstallCert.java，然后执行：java InstallCert hostname，比如：
java InstallCert www.twitter.com
Loading KeyStore D:\jdk1.6.0_24\jre\lib\security\jssecacerts... Opening connection to www.baidu.com:443... Starting SSL handshake... No errors, certificate is already trusted Server sent 3 certificate(s): 1 Subject CN=*.icbccs.com.cn, OU=Terms of use at www.verisign.com/rpa (c)05, OU =信息科技部, O=xxx有限公司, L=北京, ST=北京, C=CN Issuer CN=VeriSign Class 3 Secure Server CA - G3, OU=Terms of use at https:/ /www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US sha1 a9 97 30 cb 39 4d 5a ca 15 fc 89 4f d3 23 04 36 cf 61 be 19 md5 4a 8b cb 7f 17 e1 d5 50 c4 12 c8 bb bf 77 8b eb 2 Subject CN=VeriSign Class 3 Secure Server CA - G3, OU=Terms of use at https:/ /www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US Issuer CN=VeriSign Class 3 Public Primary Certification Authority - G5, OU=" (c) 2006 VeriSign, Inc. - For authorized use only", OU=VeriSign Trust Network, O ="VeriSign, Inc.", C=US sha1 5d eb 8f 33 9e 26 4c 19 f6 68 6f 5f 8f 32 b5 4a 4c 46 b4 76 md5 3c 48 42 0d ff 58 1a 38 86 bc fd 41 d4 8a 41 de 3 Subject CN=VeriSign Class 3 Public Primary Certification Authority - G5, OU=" (c) 2006 VeriSign, Inc. - For authorized use only", OU=VeriSign Trust Network, O ="VeriSign, Inc.", C=US Issuer OU=Class 3 Public Primary Certification Authority, O="VeriSign, Inc." , C=US sha1 32 f3 08 82 62 2b 87 cf 88 56 c6 3d b8 73 df 08 53 b4 dd 27 md5 f9 1f fe e6 a3 6b 99 88 41 d4 67 dd e5 f8 97 7a Enter certificate to add to trusted keystore or 'q' to quit: [1] 1 [ [ Version: V3 Subject: CN=*.icbccs.com.cn, OU=Terms of use at www.verisign.com/rpa (c)05, OU =信息科技部, O=xxx有限公司, L=北京, ST=北京, C=CN Signature Algorithm: SHA1withRSA, OID = 1.2.840.113549.1.1.5 Key: Sun RSA public key, 2048 bits modulus: 283237183049497030739483311693387386444719015904149423384946260493888 54312086864471764671900256428309535187300203783772426377821213096815298500496081 94282064665836828450489623558133795100728568232326857551921293699758105975955560 78467867487712207989118685364043578867064156005737107583255096315001490431619898 21045983770219821983218784505296890380008642498801268645066729325463558835459047 56207620475530345877804715669138319363187789059044457868706267672311239179445295 87885467587670081420910155653403515351433296352393207580497698650834232055543189 40686664934324614364664826746106933156049209457765088262276907115353 public exponent: 65537 Validity: [From: Wed Aug 28 08:00:00 GMT+08:00 2013, To: Sun Aug 28 07:59:59 GMT+08:00 2016] Issuer: CN=VeriSign Class 3 Secure Server CA - G3, OU=Terms of use at https:// www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US SerialNumber: [ 3de917d4 fbda51b0 529b5c0f 03e1cf57] Certificate Extensions: 8 [1]: ObjectId: 2.5.29.35 Criticality=false AuthorityKeyIdentifier [ KeyIdentifier [ 0000: 0D 44 5C 16 53 44 C1 82 7E 1D 20 AB 25 F4 01 63 .D\.SD.... .%..c 0010: D8 BE 79 A5 ..y. ] ] [2]: ObjectId: 2.5.29.31 Criticality=false CRLDistributionPoints [ [DistributionPoint: [URIName: http://SVRSecure-G3-crl.verisign.com/SVRSecureG3.crl] ]] [3]: ObjectId: 2.5.29.17 Criticality=false SubjectAlternativeName [ DNSName: *.icbccs.com.cn ] [4]: ObjectId: 2.5.29.37 Criticality=false ExtendedKeyUsages [ serverAuth clientAuth ] [5]: ObjectId: 2.5.29.32 Criticality=false CertificatePolicies [ [CertificatePolicyId: [2.16.840.1.113733.1.7.54] [PolicyQualifierInfo: [ qualifierID: 1.3.6.1.5.5.7.2.1 qualifier: 0000: 16 1C 68 74 74 70 73 3A 2F 2F 77 77 77 2E 76 65 ..https:// www.ve 0010: 72 69 73 69 67 6E 2E 63 6F 6D 2F 63 70 73 risign.com/cps ]] ] ] [6]: ObjectId: 2.5.29.15 Criticality=true KeyUsage [ DigitalSignature Key_Encipherment ] [7]: ObjectId: 1.3.6.1.5.5.7.1.1 Criticality=false AuthorityInfoAccess [ [ accessMethod: 1.3.6.1.5.5.7.48.1 accessLocation: URIName: http://ocsp.verisign.com, accessMethod: 1.3.6.1.5.5.7.48.2 accessLocation: URIName: http://SVRSecure-G3-aia.verisign.com/SVRSecureG3.cer ] ] [8]: ObjectId: 2.5.29.19 Criticality=false BasicConstraints:[ CA:false PathLen: undefined ] ] Algorithm: [SHA1withRSA] Signature: 0000: A3 20 AC AE B0 DF 95 16 5F 0D BA DF 8F 08 A2 FA . ......_....... 0010: 03 5E C4 F2 F0 58 EE 50 D4 EB B5 C4 9F A2 41 B5 .^...X.P......A. 0020: 67 00 CE 67 FB F8 B5 AC 1C D4 C0 F9 97 A6 9F 0B g..g............ 0030: 4C 38 2C 98 C7 6D 1B CA 06 1A A4 20 94 B1 41 47 L8,..m..... ..AG 0040: EA EC C5 CF 57 5E 27 A5 41 7D 1D 1E 7F 9A 6F C5 ....W^'.A.....o. 0050: E3 FE 42 C2 AD 8B 86 6B 49 6E 7A 97 D4 C7 70 A6 ..B....kInz...p. 0060: 3D DE 0A 7B ED 41 E3 C1 0D CE E8 6B 2E DB 3F 4E =....A.....k..?N 0070: EA 86 DC 10 F4 A0 32 A6 6A B3 53 AB 21 F7 4E F8 ......2.j.S.!.N. 0080: 51 AB 44 0B 2D 66 7B E3 15 2D 45 11 D8 87 23 17 Q.D.-f...-E...#. 0090: 63 FC AD C3 B3 A5 E7 F8 D5 F5 B4 0F 6B FA 9A AC c...........k... 00A0: 5C C8 13 20 A7 9A 97 5C 07 50 3F 4A D0 9C D9 2B \.. ...\.P?J...+ 00B0: 58 E4 C6 D8 53 7F 9B 40 44 0D B2 6F 83 49 71 5E [email protected]^ 00C0: D8 1B 63 59 91 C0 7E D0 CB F4 58 7B 7A AF 27 7E ..cY......X.z.'. 00D0: 1D CB 1B 9C AB 5E 7D 58 61 13 62 6C 35 C5 F6 7D .....^.Xa.bl5... 00E0: 9A 18 75 7F 7D F6 21 4D B6 DC 83 BB 51 77 40 06 ..u...!M....Qw@. 00F0: 3D D2 E8 F2 2C A7 8D 78 BA 21 42 C9 1C 59 09 07 =...,..x.!B..Y.. ] Added certificate to keystore 'jssecacerts' using alias www.baidu.com-1'
输入1，回车，然后会在当前的目录下产生一个名为“jssecacerts”的证书。
导入证书：
keytool -
import
-file d:\Server.cer -keystore
"%JAVA_HOME%\jre\lib\security\cacerts"
-alias server
|
将公钥导入到了 %JAVA_HOME%\jre\lib\security\cacerts 文件中。
使用如下命令可以看到结果：
keytool -list -keystore
"%JAVA_HOME%\jre\lib\security\cacerts"
| findstr /i server
当看到server 2014-1-15 trustedCertEntry 的结果代表执行成功
|