1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
| public class RSAUtil {
public static PublicKey getPubKey(String publicKeyPath, String keyAlgorithm){
PublicKey publicKey = null;
InputStream inputStream = null;
try{
inputStream = new FileInputStream(publicKeyPath);
publicKey = getPublicKey(inputStream,keyAlgorithm);
} catch (Exception e) {
e.printStackTrace();
System.out.println("加载公钥出错!");
} finally {
if (inputStream != null){
try {
inputStream.close();
}catch (Exception e){
System.out.println("加载公钥,关闭流时出错!");
}
}
}
return publicKey;
}
public static PublicKey getPublicKey(InputStream inputStream, String keyAlgorithm) throws Exception {
try
{
System.out.println("b1.........");
BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
System.out.println("b2.........");
StringBuilder sb = new StringBuilder();
String readLine = null;
System.out.println("b3.........");
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
sb.append('\r');
}
}
X509EncodedKeySpec pubX509 = new X509EncodedKeySpec(decodeBase64(sb.toString()));
KeyFactory keyFactory = KeyFactory.getInstance(keyAlgorithm);
PublicKey publicKey = keyFactory.generatePublic(pubX509);
return publicKey;
} catch (Exception e) {
e.printStackTrace();
throw new Exception("READ PUBLIC KEY ERROR:", e);
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {
inputStream = null;
throw new Exception("INPUT STREAM CLOSE ERROR:", e);
}
}
}
public static byte[] decodeBase64(String input) throws Exception{
Class clazz=Class.forName("com.sun.org.apache.xerces.internal.impl.dv.util.Base64");
Method mainMethod= clazz.getMethod("decode", String.class);
mainMethod.setAccessible(true);
Object retObj=mainMethod.invoke(null, input);
return (byte[])retObj;
}
public static byte[] encrypt(byte[] plainBytes, PublicKey publicKey, int keyLength, int reserveSize, String cipherAlgorithm) throws Exception {
int keyByteSize = keyLength / 8;
int encryptBlockSize = keyByteSize - reserveSize;
int nBlock = plainBytes.length / encryptBlockSize;
if ((plainBytes.length % encryptBlockSize) != 0) {
nBlock += 1;
}
ByteArrayOutputStream outbuf = null;
try {
Cipher cipher = Cipher.getInstance(cipherAlgorithm);
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
outbuf = new ByteArrayOutputStream(nBlock * keyByteSize);
for (int offset = 0; offset < plainBytes.length; offset += encryptBlockSize) {
int inputLen = plainBytes.length - offset;
if (inputLen > encryptBlockSize) {
inputLen = encryptBlockSize;
}
byte[] encryptedBlock = cipher.doFinal(plainBytes, offset, inputLen);
outbuf.write(encryptedBlock);
}
outbuf.flush();
return outbuf.toByteArray();
} catch (Exception e) {
throw new Exception("ENCRYPT ERROR:", e);
} finally {
try{
if(outbuf != null){
outbuf.close();
}
}catch (Exception e){
outbuf = null;
throw new Exception("CLOSE ByteArrayOutputStream ERROR:", e);
}
}
}
public static void main(String[] args) throws Exception{
String rsa ="RSA/ECB/OAEPWITHSHA-1ANDMGF1PADDING";
PublicKey pub=RSAUtil.getPubKey(Constant.WX_PUBLIC_KEY,"RSA");
byte[] estr=RSAUtil.encrypt("6222804263000108304".getBytes(),pub,2048, 11,rsa);
String bankno = Base64Util.encode(estr);
System.out.println(bankno);
}
}
|
