把Java生成的RSA公钥、私钥转换成.NET使用的XML格式

 1  private static String getRSAPrivateKeyAsNetFormat(byte[] encodedPrivkey) {
 2         try {
 3             StringBuffer buff = new StringBuffer(1024);
 4 
 5             PKCS8EncodedKeySpec pvkKeySpec = new PKCS8EncodedKeySpec(
 6                     encodedPrivkey);
 7             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
 8             RSAPrivateCrtKey pvkKey = (RSAPrivateCrtKey) keyFactory
 9                     .generatePrivate(pvkKeySpec);
10 
11             buff.append("<RSAKeyValue>");
12             buff.append("<Modulus>"
13                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getModulus().toByteArray()))
14                     + "</Modulus>");
15 
16             buff.append("<Exponent>"
17                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPublicExponent()
18                     .toByteArray())) + "</Exponent>");
19 
20             buff.append("<P>"
21                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPrimeP().toByteArray()))
22                     + "</P>");
23 
24             buff.append("<Q>"
25                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPrimeQ().toByteArray()))
26                     + "</Q>");
27 
28             buff.append("<DP>"
29                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPrimeExponentP()
30                     .toByteArray())) + "</DP>");
31 
32             buff.append("<DQ>"
33                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPrimeExponentQ()
34                     .toByteArray())) + "</DQ>");
35 
36             buff.append("<InverseQ>"
37                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getCrtCoefficient()
38                     .toByteArray())) + "</InverseQ>");
39 
40             buff.append("<D>"
41                     + CodeUtils.base64Encode(removeMSZero(pvkKey.getPrivateExponent()
42                     .toByteArray())) + "</D>");
43             buff.append("</RSAKeyValue>");
44 
45             return buff.toString().replaceAll("[ \t\n\r]", "");
46         } catch (Exception e) {
47             System.err.println(e);
48             return null;
49         }
50     }
51 
52     private static String getRSAPublicKeyAsNetFormat(byte[] encodedPublicKey) {
53         try {
54 
55             KeyFactory keyFactory = KeyFactory.getInstance("RSA");
56             RSAPublicKey pukKey = (RSAPublicKey) keyFactory.generatePublic(new X509EncodedKeySpec(encodedPublicKey));
57 
58             StringBuffer buff = new StringBuffer(1024);
59             buff.append("<RSAKeyValue>");
60             buff.append("<Modulus>"
61                     + CodeUtils.base64Encode(removeMSZero(pukKey.getModulus().toByteArray()))
62                     + "</Modulus>");
63             buff.append("<Exponent>"
64                     + CodeUtils.base64Encode(removeMSZero(pukKey.getPublicExponent().toByteArray())) + "</Exponent>");
65             buff.append("</RSAKeyValue>");
66             return buff.toString().replaceAll("[ \t\n\r]", "");
67         } catch (Exception e) {
68             System.err.println(e);
69             return null;
70         }
71     }