1 package com.byttersoft.hibernate.erp.szmy.util;
2
3 import java.io.ByteArrayInputStream;
4 import java.io.IOException;
5 import java.io.InputStream;
6 import java.io.InputStreamReader;
7 import java.io.Reader;
8 import java.io.StringWriter;
9 import java.io.Writer;
10 import java.security.KeyFactory;
11 import java.security.PrivateKey;
12 import java.security.PublicKey;
13 import java.security.spec.PKCS8EncodedKeySpec;
14 import java.security.spec.X509EncodedKeySpec;
15 import java.util.ArrayList;
16 import java.util.Collections;
17 import java.util.List;
18 import java.util.Map;
19
20 import org.apache.commons.codec.binary.Base64;
21
22 import com.byttersoft.framework.util.StringUtil;
23 /**
24 * RSA的签名及验签
25 * @author zhouyy
26 *
27 */
28 public class RSA {
29
30 private static final String SIGN_TYPE_RSA = "RSA";
31
32 private static final String SIGN_TYPE_RSA2 = "RSA2";
33
34 private static final String SIGN_ALGORITHMS = "SHA1WithRSA";
35
36 private static final String SIGN_SHA256RSA_ALGORITHMS = "SHA256WithRSA";
37
38 private static final int DEFAULT_BUFFER_SIZE = 8192;
39
40 /**
41 * RSA/RSA2 生成签名
42 *
43 * @param map
44 * 包含 sign_type、privateKey、charset
45 * @return
46 * @throws Exception
47 */
48 public static String rsaSign(Map map) throws Exception {
49 PrivateKey priKey = null;
50 java.security.Signature signature = null;
51 String signType = map.get("sign_type").toString();
52 String privateKey = map.get("privateKey").toString();
53 String charset = map.get("charset").toString();
54 String content = getSignContent(map);
55 map.put("content", content);
56 System.out.println("请求参数生成的字符串为:" + content);
57 if (SIGN_TYPE_RSA.equals(signType)) {
58 priKey = getPrivateKeyFromPKCS8(SIGN_TYPE_RSA, new ByteArrayInputStream(privateKey.getBytes()));
59 signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
60 } else if (SIGN_TYPE_RSA2.equals(signType)) {
61 priKey = getPrivateKeyFromPKCS8(SIGN_TYPE_RSA, new ByteArrayInputStream(privateKey.getBytes()));
62 signature = java.security.Signature.getInstance(SIGN_SHA256RSA_ALGORITHMS);
63 } else {
64 throw new Exception("不是支持的签名类型 : : signType=" + signType);
65 }
66 signature.initSign(priKey);
67
68 if (StringUtil.isEmpty(charset)) {
69 signature.update(content.getBytes());
70 } else {
71 signature.update(content.getBytes(charset));
72 }
73
74 byte[] signed = signature.sign();
75
76 return new String(Base64.encodeBase64(signed));
77
78 }
79
80 /**
81 * 验签方法
82 *
83 * @param content
84 * 参数的合成字符串格式: key1=value1&key2=value2&key3=value3...
85 * @param sign
86 * @param publicKey
87 * @param charset
88 * @param signType
89 * @return
90 */
91 public static boolean rsaCheck(Map map, String sign) throws Exception {
92 java.security.Signature signature = null;
93 String signType = map.get("sign_type").toString();
94 String privateKey = map.get("privateKey").toString();
95 String charset = map.get("charset").toString();
96 String content = map.get("content").toString();
97 String publicKey = map.get("publicKey").toString();
98 System.out.println(">>验证的签名为:" + sign);
99 System.out.println(">>生成签名的参数为:" + content);
100 PublicKey pubKey = getPublicKeyFromX509("RSA", new ByteArrayInputStream(publicKey.getBytes()));
101 if (SIGN_TYPE_RSA.equals(signType)) {
102 signature = java.security.Signature.getInstance(SIGN_ALGORITHMS);
103 } else if (SIGN_TYPE_RSA2.equals(signType)) {
104 signature = java.security.Signature.getInstance(SIGN_SHA256RSA_ALGORITHMS);
105 } else {
106 throw new Exception("不是支持的签名类型 : signType=" + signType);
107 }
108 signature.initVerify(pubKey);
109
110 if (StringUtil.isEmpty(charset)) {
111 signature.update(content.getBytes());
112 } else {
113 signature.update(content.getBytes(charset));
114 }
115
116 return signature.verify(Base64.decodeBase64(sign.getBytes()));
117 }
118
119 public static PrivateKey getPrivateKeyFromPKCS8(String algorithm, InputStream ins) throws Exception {
120 if (ins == null || StringUtil.isEmpty(algorithm)) {
121 return null;
122 }
123
124 KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
125
126 byte[] encodedKey = readText(ins).getBytes();
127
128 encodedKey = Base64.decodeBase64(encodedKey);
129
130 return keyFactory.generatePrivate(new PKCS8EncodedKeySpec(encodedKey));
131 }
132
133 public static PublicKey getPublicKeyFromX509(String algorithm, InputStream ins) throws Exception {
134 KeyFactory keyFactory = KeyFactory.getInstance(algorithm);
135
136 StringWriter writer = new StringWriter();
137 io(new InputStreamReader(ins), writer, -1);
138
139 byte[] encodedKey = writer.toString().getBytes();
140
141 encodedKey = Base64.decodeBase64(encodedKey);
142
143 return keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
144 }
145
146 /**
147 * 把参数合成成字符串
148 *
149 * @param sortedParams
150 * @return
151 */
152 public static String getSignContent(Map<String, String> sortedParams) {
153 StringBuffer content = new StringBuffer();
154 // app_id,method,charset,sign_type,version,bill_type,timestamp,bill_date
155 String[] sign_param = sortedParams.get("sign_param").split(",");// 生成签名所需的参数
156 List<String> keys = new ArrayList<String>();
157 for (int i = 0; i < sign_param.length; i++) {
158 keys.add(sign_param[i]);
159 }
160 Collections.sort(keys);
161 int index = 0;
162 for (int i = 0; i < keys.size(); i++) {
163 String key = keys.get(i);
164 /*if ("biz_content".equals(key)) {
165 content.append(
166 (index == 0 ? "" : "&") + key + "={\"bill_date\":\"" + sortedParams.get("bill_date") + "\",")
167 .append("\"bill_type\":\"" + sortedParams.get("bill_type") + "\"}");
168 index++;
169 } else {*/
170 String value = sortedParams.get(key);
171 if (StringUtil.isNotEmpty(key) && StringUtil.isNotEmpty(value)) {
172 content.append((index == 0 ? "" : "&") + key + "=" + value);
173 index++;
174 }
175 // }
176 }
177 return content.toString();
178 }
179
180 private static String readText(InputStream ins) throws IOException {
181 Reader reader = new InputStreamReader(ins);
182 StringWriter writer = new StringWriter();
183
184 io(reader, writer, -1);
185 return writer.toString();
186 }
187
188 private static void io(Reader in, Writer out, int bufferSize) throws IOException {
189 if (bufferSize == -1) {
190 bufferSize = DEFAULT_BUFFER_SIZE >> 1;
191 }
192
193 char[] buffer = new char[bufferSize];
194 int amount;
195
196 while ((amount = in.read(buffer)) >= 0) {
197 out.write(buffer, 0, amount);
198 }
199 }
200
201 }
来源：https://www.cnblogs.com/chinazhou-wang/p/6728327.html