Java读取证书、公钥、私钥

1. import java.io.ByteArrayOutputStream;
2. import java.io.FileInputStream;
3. import java.io.IOException;
4. import java.io.InputStream;
5. import java.security.KeyStore;
6. import java.security.PrivateKey;
7. import java.security.PublicKey;
8. import java.security.cert.Certificate;
9. import java.security.cert.CertificateException;
10. import java.util.Enumeration;
12. import com.sun.org.apache.xml.internal.security.utils.Base64;
13. import com.help.Conf_Info;
15. public class VerifiSign2
16. {
17. public void main(String[] args)
18. {
19. getPrivateKeyInfo();
20. getPublicKeyInfo();
21. }
23. /**
24. * 获取私钥别名等信息
25. */
26. public String getPrivateKeyInfo()
27. {
28. String privKeyFileString = Conf_Info.PrivatePath;
29. String privKeyPswdString = "" + Conf_Info.password;
30. String keyAlias = null;
31. try
32. {
33. KeyStore keyStore = KeyStore.getInstance( "PKCS12");
34. FileInputStream fileInputStream = new FileInputStream(privKeyFileString);
35. char[] nPassword = null;
36. if ((privKeyPswdString == null) || privKeyPswdString.trim().equals( ""))
37. {
38. nPassword = null;
39. } else
40. {
41. nPassword = privKeyPswdString.toCharArray();
42. }
43. keyStore.load(fileInputStream, nPassword);
44. fileInputStream.close();
45. System.out.println( "keystore type=" + keyStore.getType());
47. Enumeration<string> enumeration = keyStore.aliases();
49. if (enumeration.hasMoreElements())
50. {
51. keyAlias = (String) enumeration.nextElement();
52. System.out.println( "alias=[" + keyAlias + "]");
53. }
54. System.out.println( "is key entry=" + keyStore.isKeyEntry(keyAlias));
55. PrivateKey prikey = (PrivateKey) keyStore.getKey(keyAlias, nPassword);
56. Certificate cert = keyStore.getCertificate(keyAlias);
57. PublicKey pubkey = cert.getPublicKey();
58. System.out.println( "cert class = " + cert.getClass().getName());
59. System.out.println( "cert = " + cert);
60. System.out.println( "public key = " + pubkey);
61. System.out.println( "private key = " + prikey);
63. } catch (Exception e)
64. {
65. System.out.println(e);
66. }
67. return keyAlias;
68. }
70. /**
71. * 获取公钥信息
72. */
73. public void getPublicKeyInfo()
74. {
75. String tmp0 = Conf_Info.Public_cer;
76. String tmp1 = "";
77. try
78. {
79. tmp1 = getPublicKey(Conf_Info.PublicCerPath).replaceAll( "\n", "");
80. System.out.println( "商户公钥字符串：\n" + tmp1);
81. System.out.println( "\n商户公钥字符给定串：\n" + tmp0);
82. if (tmp0.equals(tmp1))
83. System.out.println( "=========");
84. else
85. {
86. System.out.println( "**************");
87. }
89. } catch (CertificateException e)
90. {
91. e.printStackTrace();
92. System.out.println(e);
93. } catch (IOException e)
94. {
95. e.printStackTrace();
96. System.out.println(e);
97. }
98. }
100. /**
101. * 读取公钥cer
102. *
103. * @param path
104. * .cer文件的路径 如：c:/abc.cer
105. * @return base64后的公钥串
106. * @throws IOException
107. * @throws CertificateException
108. */
109. public static String getPublicKey(String path) throws IOException, CertificateException
110. {
111. InputStream inStream = new FileInputStream(path);
112. ByteArrayOutputStream out = new ByteArrayOutputStream();
113. int ch;
114. String res = "";
115. while ((ch = inStream.read()) != - 1)
116. {
117. out.write(ch);
118. }
119. byte[] result = out.toByteArray();
120. // res = Base64.byteArrayToBase64(result);
121. res = Base64.encode(result);
122. return res;
123. }
125. }