java 加密工具类（MD5、RSA、AES等加密方式）

• Z时代
• 2024-01-10
• 分类：综合

1.加密工具类encryption

MD5加密

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1. import org.apache.commons.codec.digest.DigestUtils;  
2.   
3. /** 
4.  * MD5加密组件 
5.  *  
6.  * @author wbw 
7.  * @version 1.0 
8.  * @since 1.0 
9.  */  
10. public abstract class MD5Util {  
11.   
12.     /** 
13.      * MD5加密 
14.      *  
15.      * @param data 
16.      *            待加密数据 
17.      * @return byte[] 消息摘要 
18.      *  
19.      * @throws Exception 
20.      */  
21.     public static byte[] encodeMD5(String data) throws Exception {  
22.   
23.         // 执行消息摘要  
24.         return DigestUtils.md5(data);  
25.     }  
26.   
27.     /** 
28.      * MD5加密 
29.      *  
30.      * @param data 
31.      *            待加密数据 
32.      * @return byte[] 消息摘要 
33.      *  
34.      * @throws Exception 
35.      */  
36.     public static String encodeMD5Hex(String data) {  
37.         // 执行消息摘要  
38.         return DigestUtils.md5Hex(data);  
39.     }  
40. }  

import org.apache.commons.codec.digest.DigestUtils;
/**

• MD5加密组件

• @author wbw

• @version 1.0

• @since 1.0
  

  */
  

  public abstract class MD5Util {

  /**

  • MD5加密

  • @param data

  •        待加密数据
    

  • @return byte[] 消息摘要

  • @throws Exception
    

    */
    

    public static byte[] encodeMD5(String data) throws Exception {

    // 执行消息摘要
    

    return DigestUtils.md5(data);
    

    }

  /**

  • MD5加密
  • @param data

  •        待加密数据
    

  • @return byte[] 消息摘要
  • @throws Exception
    

    */
    

    public static String encodeMD5Hex(String data) {
    

    // 执行消息摘要
    

    return DigestUtils.md5Hex(data);
    

    }
    

    }
    

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1. import javax.crypto.Cipher;  
2. import javax.crypto.spec.SecretKeySpec;  
3.   
4. public class AESUtil {  
5.   
6.     private static final String KEY_AES = "AES";  
7.   
8.     public static String encrypt(String src, String key) throws Exception {  
9.         if (key == null || key.length() != 16) {  
10.             throw new Exception("key不满足条件");  
11.         }   
12.         byte[] raw = key.getBytes();  
13.         SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);  
14.         Cipher cipher = Cipher.getInstance(KEY_AES);  
15.         cipher.init(Cipher.ENCRYPT_MODE, skeySpec);  
16.         byte[] encrypted = cipher.doFinal(src.getBytes());  
17.         return byte2hex(encrypted);  
18.     }  
19.   
20.     public static String decrypt(String src, String key) throws Exception {  
21.         if (key == null || key.length() != 16) {  
22.             throw new Exception("key不满足条件");  
23.         }  
24.         byte[] raw = key.getBytes();  
25.         SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);  
26.         Cipher cipher = Cipher.getInstance(KEY_AES);  
27.         cipher.init(Cipher.DECRYPT_MODE, skeySpec);  
28.         byte[] encrypted1 = hex2byte(src);  
29.         byte[] original = cipher.doFinal(encrypted1);  
30.         String originalString = new String(original);  
31.         return originalString;  
32.     }  
33.   
34.     public static byte[] hex2byte(String strhex) {  
35.         if (strhex == null) {  
36.             return null;  
37.         }  
38.         int l = strhex.length();  
39.         if (l % 2 == 1) {  
40.             return null;  
41.         }  
42.         byte[] b = new byte[l / 2];  
43.         for (int i = 0; i != l / 2; i++) {  
44.             b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),  
45.                     16);  
46.         }  
47.         return b;  
48.     }  
49.   
50.     public static String byte2hex(byte[] b) {  
51.         String hs = "";  
52.         String stmp = "";  
53.         for (int n = 0; n < b.length; n++) {  
54.             stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));  
55.             if (stmp.length() == 1) {  
56.                 hs = hs + "0" + stmp;  
57.             } else {  
58.                 hs = hs + stmp;  
59.             }  
60.         }  
61.         return hs.toUpperCase();  
62.     }  
63.   
64. }  

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class AESUtil {
private static final String KEY_AES = "AES";
public static String encrypt(String src, String key) throws Exception {
	if (key == null || key.length() != 16) {
		throw new Exception("key不满足条件");
	} 
	byte[] raw = key.getBytes();
	SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
	Cipher cipher = Cipher.getInstance(KEY_AES);
	cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
	byte[] encrypted = cipher.doFinal(src.getBytes());
	return byte2hex(encrypted);
}
public static String decrypt(String src, String key) throws Exception {
	if (key == null || key.length() != 16) {
		throw new Exception("key不满足条件");
	}
	byte[] raw = key.getBytes();
	SecretKeySpec skeySpec = new SecretKeySpec(raw, KEY_AES);
	Cipher cipher = Cipher.getInstance(KEY_AES);
	cipher.init(Cipher.DECRYPT_MODE, skeySpec);
	byte[] encrypted1 = hex2byte(src);
	byte[] original = cipher.doFinal(encrypted1);
	String originalString = new String(original);
	return originalString;
}
public static byte[] hex2byte(String strhex) {
	if (strhex == null) {
		return null;
	}
	int l = strhex.length();
	if (l % 2 == 1) {
		return null;
	}
	byte[] b = new byte[l / 2];
	for (int i = 0; i != l / 2; i++) {
		b[i] = (byte) Integer.parseInt(strhex.substring(i * 2, i * 2 + 2),
				16);
	}
	return b;
}
public static String byte2hex(byte[] b) {
	String hs = "";
	String stmp = "";
	for (int n = 0; n < b.length; n++) {
		stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
		if (stmp.length() == 1) {
			hs = hs + "0" + stmp;
		} else {
			hs = hs + stmp;
		}
	}
	return hs.toUpperCase();
}
}

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1. import org.apache.commons.codec.binary.Base64;  
2.   
3. /** 
4.  * Base64组件 
5.  *  
6.  * @author wbw 
7.  * @version 1.0 
8.  * @since 1.0 
9.  */  
10. public abstract class Base64Util {  
11.   
12.     /** 
13.      * 字符编码 
14.      */  
15.     public final static String ENCODING = "UTF-8";  
16.   
17.     /** 
18.      * Base64编码 
19.      *  
20.      * @param data 待编码数据 
21.      * @return String 编码数据 
22.      * @throws Exception 
23.      */  
24.     public static String encode(String data) throws Exception {  
25.   
26.         // 执行编码  
27.         byte[] b = Base64.encodeBase64(data.getBytes(ENCODING));  
28.   
29.         return new String(b, ENCODING);  
30.     }  
31.   
32.     /** 
33.      * Base64安全编码<br> 
34.      * 遵循RFC 2045实现 
35.      *  
36.      * @param data 
37.      *            待编码数据 
38.      * @return String 编码数据 
39.      *  
40.      * @throws Exception 
41.      */  
42.     public static String encodeSafe(String data) throws Exception {  
43.   
44.         // 执行编码  
45.         byte[] b = Base64.encodeBase64(data.getBytes(ENCODING), true);  
46.   
47.         return new String(b, ENCODING);  
48.     }  
49.   
50.     /** 
51.      * Base64解码 
52.      *  
53.      * @param data 待解码数据 
54.      * @return String 解码数据 
55.      * @throws Exception 
56.      */  
57.     public static String decode(String data) throws Exception {  
58.   
59.         // 执行解码  
60.         byte[] b = Base64.decodeBase64(data.getBytes(ENCODING));  
61.   
62.         return new String(b, ENCODING);  
63.     }  
64.   
65. }  

import org.apache.commons.codec.binary.Base64;
/**

• Base64组件

• @author wbw

• @version 1.0

• @since 1.0
  

  */
  

  public abstract class Base64Util {

  /**

  • 字符编码
    

    */
    

    public final static String ENCODING = "UTF-8";

  /**

  • Base64编码

  • @param data 待编码数据

  • @return String 编码数据

  • @throws Exception
    

    */
    

    public static String encode(String data) throws Exception {

    // 执行编码
    

    byte[] b = Base64.encodeBase64(data.getBytes(ENCODING));

    return new String(b, ENCODING);
    

    }

  /**

  • Base64安全编码<br>

  • 遵循RFC 2045实现

  • @param data

  •        待编码数据
    

  • @return String 编码数据

  • @throws Exception
    

    */
    

    public static String encodeSafe(String data) throws Exception {

    // 执行编码
    

    byte[] b = Base64.encodeBase64(data.getBytes(ENCODING), true);

    return new String(b, ENCODING);
    

    }

  /**

  • Base64解码

  • @param data 待解码数据

  • @return String 解码数据

  • @throws Exception
    

    */
    

    public static String decode(String data) throws Exception {

    // 执行解码
    

    byte[] b = Base64.decodeBase64(data.getBytes(ENCODING));

    return new String(b, ENCODING);
    

    }

}

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1. import java.security.Key;  
2. import java.security.SecureRandom;  
3. import java.security.Security;  
4.   
5. import javax.crypto.Cipher;  
6. import javax.crypto.KeyGenerator;  
7. import javax.crypto.SecretKey;  
8. import javax.crypto.SecretKeyFactory;  
9. import javax.crypto.spec.DESKeySpec;  
10.   
11. import org.apache.commons.codec.binary.Base64;  
12. import org.bouncycastle.jce.provider.BouncyCastleProvider;  
13.   
14. /** 
15.  * DES安全编码组件 
16.  *  
17.  * @author wbw 
18.  * @version 1.0 
19.  */  
20. public abstract class DESUtil {  
21.     static{  
22.         Security.insertProviderAt(new BouncyCastleProvider(), 1);  
23.     }  
24.     /** 
25.      * 密钥算法 <br> 
26.      * Java 6 只支持56bit密钥 <br> 
27.      * Bouncy Castle 支持64bit密钥 
28.      */  
29.     public static final String KEY_ALGORITHM = "DES";  
30.   
31.     /** 
32.      * 加密/解密算法 / 工作模式 / 填充方式 
33.      */  
34.     public static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5PADDING";  
35.   
36.     /** 
37.      * 转换密钥 
38.      *  
39.      * @param key 
40.      *            二进制密钥 
41.      * @return Key 密钥 
42.      * @throws Exception 
43.      */  
44.     private static Key toKey(byte[] key) throws Exception {  
45.   
46.         // 实例化DES密钥材料  
47.         DESKeySpec dks = new DESKeySpec(key);  
48.   
49.         // 实例化秘密密钥工厂  
50.         SecretKeyFactory keyFactory = SecretKeyFactory  
51.                 .getInstance(KEY_ALGORITHM);  
52.   
53.         // 生成秘密密钥  
54.         SecretKey secretKey = keyFactory.generateSecret(dks);  
55.   
56.         return secretKey;  
57.     }  
58.   
59.     /** 
60.      * 解密 
61.      *  
62.      * @param data 
63.      *            待解密数据 
64.      * @param key 
65.      *            密钥 
66.      * @return byte[] 解密数据 
67.      * @throws Exception 
68.      */  
69.     public static byte[] decrypt(byte[] data, byte[] key) throws Exception {  
70.   
71.         // 还原密钥  
72.         Key k = toKey(key);  
73.   
74.         // 实例化  
75.         Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);  
76.   
77.         // 初始化，设置为解密模式  
78.         cipher.init(Cipher.DECRYPT_MODE, k);  
79.   
80.         // 执行操作  
81.         return cipher.doFinal(data);  
82.     }  
83.   
84.     /** 
85.      * 加密 
86.      *  
87.      * @param data 
88.      *            待加密数据 
89.      * @param key 
90.      *            密钥 
91.      * @return byte[] 加密数据 
92.      * @throws Exception 
93.      */  
94.     public static byte[] encrypt(byte[] data, byte[] key) throws Exception {  
95.   
96.         // 还原密钥  
97.         Key k = toKey(key);  
98.   
99.         // 实例化  
100.         Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);  
101.   
102.         // 初始化，设置为加密模式  
103.         cipher.init(Cipher.ENCRYPT_MODE, k);  
104.   
105.         // 执行操作  
106.         return cipher.doFinal(data);  
107.     }  
108.   
109.     /** 
110.      * 生成密钥 <br> 
111.      * Java 6 只支持56bit密钥 <br> 
112.      * Bouncy Castle 支持64bit密钥 <br> 
113.      *  
114.      * @return byte[] 二进制密钥 
115.      * @throws Exception 
116.      */  
117.     public static byte[] initKey() throws Exception {  
118.   
119.         /* 
120.          * 实例化密钥生成器 
121.          *  
122.          * 若要使用64bit密钥注意替换 将下述代码中的KeyGenerator.getInstance(CIPHER_ALGORITHM); 
123.          * 替换为KeyGenerator.getInstance(CIPHER_ALGORITHM, "BC"); 
124.          */  
125.         KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);  
126.   
127.         /* 
128.          * 初始化密钥生成器 若要使用64bit密钥注意替换 将下述代码kg.init(56); 替换为kg.init(64); 
129.          */  
130.         kg.init(56, new SecureRandom());  
131.   
132.         // 生成秘密密钥  
133.         SecretKey secretKey = kg.generateKey();  
134.   
135.         // 获得密钥的二进制编码形式  
136.         return secretKey.getEncoded();  
137.     }  
138.       
139.     public static byte[] initKey(String seed) throws Exception {  
140.         KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);  
141.         SecureRandom secureRandom = new SecureRandom(new Base64().decode(seed));    
142.         kg.init(secureRandom);  
143.         SecretKey secretKey = kg.generateKey();  
144.         return secretKey.getEncoded();  
145.     }  
146. }  

import java.security.Key;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
/**

• DES安全编码组件

• @author wbw

• @version 1.0
  /
  

  public abstract class DESUtil {
  

  static{
  

  Security.insertProviderAt(new BouncyCastleProvider(), 1);
  

  }
  

  /*

  • 密钥算法 <br>
  • Java 6 只支持56bit密钥 <br>
  • Bouncy Castle 支持64bit密钥
    

    */
    

    public static final String KEY_ALGORITHM = "DES";

  /**

  • 加密/解密算法 / 工作模式 / 填充方式
    

    */
    

    public static final String CIPHER_ALGORITHM = "DES/ECB/PKCS5PADDING";

  /**

  • 转换密钥

  • @param key

  •        二进制密钥
    

  • @return Key 密钥

  • @throws Exception
    

    */
    

    private static Key toKey(byte[] key) throws Exception {

    // 实例化DES密钥材料
    

    DESKeySpec dks = new DESKeySpec(key);

    // 实例化秘密密钥工厂
    

    SecretKeyFactory keyFactory = SecretKeyFactory
    

    .getInstance(KEY_ALGORITHM);

    // 生成秘密密钥
    

    SecretKey secretKey = keyFactory.generateSecret(dks);

    return secretKey;
    

    }

  /**

  • 解密

  • @param data

  •        待解密数据
    

  • @param key

  •        密钥
    

  • @return byte[] 解密数据

  • @throws Exception
    

    */
    

    public static byte[] decrypt(byte[] data, byte[] key) throws Exception {

    // 还原密钥
    

    Key k = toKey(key);

    // 实例化
    

    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);

    // 初始化，设置为解密模式
    

    cipher.init(Cipher.DECRYPT_MODE, k);

    // 执行操作
    

    return cipher.doFinal(data);
    

    }

  /**

  • 加密

  • @param data

  •        待加密数据
    

  • @param key

  •        密钥
    

  • @return byte[] 加密数据

  • @throws Exception
    

    */
    

    public static byte[] encrypt(byte[] data, byte[] key) throws Exception {

    // 还原密钥
    

    Key k = toKey(key);

    // 实例化
    

    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);

    // 初始化，设置为加密模式
    

    cipher.init(Cipher.ENCRYPT_MODE, k);

    // 执行操作
    

    return cipher.doFinal(data);
    

    }

  /**

  • 生成密钥 <br>

  • Java 6 只支持56bit密钥 <br>

  • Bouncy Castle 支持64bit密钥 <br>

  • @return byte[] 二进制密钥

  • @throws Exception
    

    */
    

    public static byte[] initKey() throws Exception {

    /*

    • 实例化密钥生成器
    • 若要使用64bit密钥注意替换 将下述代码中的KeyGenerator.getInstance(CIPHER_ALGORITHM);
    • 替换为KeyGenerator.getInstance(CIPHER_ALGORITHM, "BC");
      

      */
      

      KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);

    /*

    • 初始化密钥生成器 若要使用64bit密钥注意替换 将下述代码kg.init(56); 替换为kg.init(64);
      

      */
      

      kg.init(56, new SecureRandom());

    // 生成秘密密钥
    

    SecretKey secretKey = kg.generateKey();

    // 获得密钥的二进制编码形式
    

    return secretKey.getEncoded();
    

    }

  public static byte[] initKey(String seed) throws Exception {
  

  KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);
  

  SecureRandom secureRandom = new SecureRandom(new Base64().decode(seed));
  

  kg.init(secureRandom);
  

  SecretKey secretKey = kg.generateKey();
  

  return secretKey.getEncoded();
  

  }
  

  }
  

[java] view plain copy print?

1. import java.io.ByteArrayOutputStream;  
2. import java.security.Key;  
3. import java.security.KeyFactory;  
4. import java.security.KeyPair;  
5. import java.security.KeyPairGenerator;  
6. import java.security.PrivateKey;  
7. import java.security.PublicKey;  
8. import java.security.SecureRandom;  
9. import java.security.Security;  
10. import java.security.interfaces.RSAPrivateKey;  
11. import java.security.interfaces.RSAPublicKey;  
12. import java.security.spec.PKCS8EncodedKeySpec;  
13. import java.security.spec.X509EncodedKeySpec;  
14. import java.util.HashMap;  
15. import java.util.Map;  
16. import java.util.UUID;  
17.   
18. import javax.crypto.Cipher;  
19.   
20. import org.bouncycastle.jce.provider.BouncyCastleProvider;  
21. import org.bouncycastle.util.encoders.Base64;  
22.   
23.   
24. /** 
25.  * RSA安全编码组件 
26.  *  
27.  * @author wbw 
28.  * @version 1.0 
29.  */  
30. public class RSAUtil {  
31.     /** 
32.      * 非对称加密密钥算法 
33.      */  
34.     public static final String KEY_ALGORITHM_RSA = "RSA";  
35.   
36.     /** 
37.      * 公钥 
38.      */  
39.     private static final String RSA_PUBLIC_KEY = "RSAPublicKey";  
40.   
41.     /** 
42.      * 私钥 
43.      */  
44.     private static final String RSA_PRIVATE_KEY = "RSAPrivateKey";  
45.       
46.     /** 
47.      * RSA密钥长度  
48.      * 默认1024位， 
49.      * 密钥长度必须是64的倍数，  
50.      * 范围在512至65536位之间。 
51.      */  
52.     private static final int KEY_SIZE = 1024;  
53.       
54.     static{  
55.         Security.insertProviderAt(new BouncyCastleProvider(), 1);  
56.     }  
57.     /** 
58.      * 私钥解密 
59.      *  
60.      * @param data 
61.      *            待解密数据 
62.      * @param key 
63.      *            私钥 
64.      * @return byte[] 解密数据 
65.      * @throws Exception 
66.      */  
67.     public static byte[] decryptByPrivateKey(byte[] data, byte[] key)  
68.             throws Exception {  
69.   
70.         // 取得私钥  
71.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);  
72.   
73.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
74.   
75.         // 生成私钥  
76.         PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);  
77.   
78.         // 对数据解密  
79.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  
80.   
81.         cipher.init(Cipher.DECRYPT_MODE, privateKey);  
82.   
83.         int blockSize = cipher.getBlockSize();  
84.         if(blockSize>0){  
85.             ByteArrayOutputStream bout = new ByteArrayOutputStream(64);  
86.             int j = 0;  
87.             while (data.length - j * blockSize > 0) {  
88.                 bout.write(cipher.doFinal(data, j * blockSize, blockSize));  
89.                 j++;  
90.             }  
91.             return bout.toByteArray();  
92.         }  
93.         return cipher.doFinal(data);  
94.     }  
95.   
96.     /** 
97.      * 公钥解密 
98.      *  
99.      * @param data 
100.      *            待解密数据 
101.      * @param key 
102.      *            公钥 
103.      * @return byte[] 解密数据 
104.      * @throws Exception 
105.      */  
106.     public static byte[] decryptByPublicKey(byte[] data, byte[] key)  
107.             throws Exception {  
108.   
109.         // 取得公钥  
110.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);  
111.   
112.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
113.   
114.         // 生成公钥  
115.         PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);  
116.   
117.         // 对数据解密  
118.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  
119.   
120.         cipher.init(Cipher.DECRYPT_MODE, publicKey);  
121.   
122.         return cipher.doFinal(data);  
123.     }  
124.   
125.     /** 
126.      * 公钥加密 
127.      *  
128.      * @param data 
129.      *            待加密数据 
130.      * @param key 
131.      *            公钥 
132.      * @return byte[] 加密数据 
133.      * @throws Exception 
134.      */  
135.     public static byte[] encryptByPublicKey(byte[] data, byte[] key)  
136.             throws Exception {  
137.   
138.         // 取得公钥  
139.         X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);  
140.   
141.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
142.           
143.         PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);  
144.   
145.         // 对数据加密  
146.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  
147.   
148.         cipher.init(Cipher.ENCRYPT_MODE, publicKey);  
149.           
150.         int blockSize = cipher.getBlockSize();  
151.         if(blockSize>0){  
152.             int outputSize = cipher.getOutputSize(data.length);  
153.             int leavedSize = data.length % blockSize;  
154.             int blocksSize = leavedSize != 0 ? data.length / blockSize + 1  
155.                     : data.length / blockSize;  
156.             byte[] raw = new byte[outputSize * blocksSize];  
157.             int i = 0,remainSize=0;  
158.             while ((remainSize = data.length - i * blockSize) > 0) {  
159.                 int inputLen = remainSize > blockSize?blockSize:remainSize;  
160.                 cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);  
161.                 i++;  
162.             }  
163.             return raw;  
164.         }  
165.         return cipher.doFinal(data);  
166.     }  
167.   
168.     /** 
169.      * 私钥加密 
170.      *  
171.      * @param data 
172.      *            待加密数据 
173.      * @param key 
174.      *            私钥 
175.      * @return byte[] 加密数据 
176.      * @throws Exception 
177.      */  
178.     public static byte[] encryptByPrivateKey(byte[] data, byte[] key)  
179.             throws Exception {  
180.   
181.         // 取得私钥  
182.         PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);  
183.   
184.         KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
185.   
186.         // 生成私钥  
187.         PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);  
188.   
189.         // 对数据加密  
190.         Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());  
191.   
192.         cipher.init(Cipher.ENCRYPT_MODE, privateKey);  
193.   
194.         int blockSize = cipher.getBlockSize();  
195.         if(blockSize>0){  
196.             int outputSize = cipher.getOutputSize(data.length);  
197.             int leavedSize = data.length % blockSize;  
198.             int blocksSize = leavedSize != 0 ? data.length / blockSize + 1  
199.                     : data.length / blockSize;  
200.             byte[] raw = new byte[outputSize * blocksSize];  
201.             int i = 0,remainSize=0;  
202.             while ((remainSize = data.length - i * blockSize) > 0) {  
203.                 int inputLen = remainSize > blockSize?blockSize:remainSize;  
204.                 cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);  
205.                 i++;  
206.             }  
207.             return raw;  
208.         }  
209.         return cipher.doFinal(data);  
210.     }  
211.   
212.     /** 
213.      * 取得私钥 
214.      *  
215.      * @param keyMap 
216.      *            密钥Map 
217.      * @return key 私钥 
218.      * @throws Exception 
219.      */  
220.     public static Key getPrivateKey(Map<String, Key> keyMap)  
221.             throws Exception {  
222.         return keyMap.get(RSA_PRIVATE_KEY);  
223.     }  
224.   
225.     /** 
226.      * 取得私钥 
227.      *  
228.      * @param keyMap 
229.      *            密钥Map 
230.      * @return byte[] 私钥 
231.      * @throws Exception 
232.      */  
233.     public static byte[] getPrivateKeyByte(Map<String, Key> keyMap)  
234.             throws Exception {  
235.         return keyMap.get(RSA_PRIVATE_KEY).getEncoded();  
236.     }  
237.       
238.     /** 
239.      * 取得公钥 
240.      *  
241.      * @param keyMap 
242.      *            密钥Map 
243.      * @return key 公钥 
244.      * @throws Exception 
245.      */  
246.     public static Key getPublicKey(Map<String, Key> keyMap)  
247.             throws Exception {  
248.         return keyMap.get(RSA_PUBLIC_KEY);  
249.     }  
250.       
251.     /** 
252.      * 取得公钥 
253.      *  
254.      * @param keyMap 
255.      *            密钥Map 
256.      * @return byte[] 公钥 
257.      * @throws Exception 
258.      */  
259.     public static byte[] getPublicKeyByte(Map<String, Key> keyMap)  
260.             throws Exception {  
261.         return keyMap.get(RSA_PUBLIC_KEY).getEncoded();  
262.     }  
263.       
264.     /** 
265.      * 初始化密钥 
266.      * @param byte[] seed 种子 
267.      * @return Map 密钥Map 
268.      * @throws Exception 
269.      */  
270.     public static Map<String,Key> initKey(byte[] seed)throws Exception{  
271.         // 实例化密钥对生成器  
272.         KeyPairGenerator keyPairGen = KeyPairGenerator  
273.                 .getInstance(KEY_ALGORITHM_RSA);  
274.   
275.         // 初始化密钥对生成器  
276.         keyPairGen.initialize(KEY_SIZE, new SecureRandom(seed) );  
277.   
278.         // 生成密钥对  
279.         KeyPair keyPair = keyPairGen.generateKeyPair();  
280.   
281.         // 公钥  
282.         RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();  
283.   
284.         // 私钥  
285.         RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();  
286.   
287.         // 封装密钥  
288.         Map<String, Key> keyMap = new HashMap<String, Key>(2);  
289.   
290.         keyMap.put(RSA_PUBLIC_KEY, publicKey);  
291.         keyMap.put(RSA_PRIVATE_KEY, privateKey);  
292.   
293.         return keyMap;  
294.     }  
295.       
296.     /** 
297.      * 初始化密钥 
298.      * @param seed 种子 
299.      * @return Map 密钥Map 
300.      * @throws Exception 
301.      */  
302.     public static Map<String,Key> initKey(String seed)throws Exception{  
303.         return initKey(seed.getBytes());  
304.     }  
305.   
306.     /** 
307.      * 初始化密钥 
308.      *  
309.      * @return Map 密钥Map 
310.      * @throws Exception 
311.      */  
312.     public static Map<String, Key> initKey() throws Exception {  
313.         return initKey(UUID.randomUUID().toString().getBytes());  
314.     }  
315.       
316.     public static PublicKey getPublicRSAKey(String key) throws Exception {  
317.         X509EncodedKeySpec x509 = new X509EncodedKeySpec(Base64.decode(key));  
318.         KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
319.         return kf.generatePublic(x509);  
320.     }  
321.   
322.     public static PrivateKey getPrivateRSAKey(String key) throws Exception {  
323.         PKCS8EncodedKeySpec pkgs8 = new PKCS8EncodedKeySpec(Base64.decode(key));  
324.         KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);  
325.         return kf.generatePrivate(pkgs8);  
326.     }  
327.   
328. }  

import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Security;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import javax.crypto.Cipher;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
/**

• RSA安全编码组件

• @author wbw

• @version 1.0
  /
  

  public class RSAUtil {
  

  /*

  • 非对称加密密钥算法
    

    */
    

    public static final String KEY_ALGORITHM_RSA = "RSA";

  /**

  • 公钥
    

    */
    

    private static final String RSA_PUBLIC_KEY = "RSAPublicKey";

  /**

  • 私钥
    

    */
    

    private static final String RSA_PRIVATE_KEY = "RSAPrivateKey";

  /**

  • RSA密钥长度
  • 默认1024位，
  • 密钥长度必须是64的倍数，
  • 范围在512至65536位之间。
    

    */
    

    private static final int KEY_SIZE = 1024;

  static{
  

  Security.insertProviderAt(new BouncyCastleProvider(), 1);
  

  }
  

  /**

  • 私钥解密

  • @param data

  •        待解密数据
    

  • @param key

  •        私钥
    

  • @return byte[] 解密数据

  • @throws Exception
    

    */
    

    public static byte[] decryptByPrivateKey(byte[] data, byte[] key)
    

    throws Exception {

    // 取得私钥
    

    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);

    // 生成私钥
    

    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

    // 对数据解密
    

    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, privateKey);

    int blockSize = cipher.getBlockSize();
    

    if(blockSize>0){
    

    ByteArrayOutputStream bout = new ByteArrayOutputStream(64);
    

    int j = 0;
    

    while (data.length - j * blockSize > 0) {
    

    bout.write(cipher.doFinal(data, j * blockSize, blockSize));
    

    j++;
    

    }
    

    return bout.toByteArray();
    

    }
    

    return cipher.doFinal(data);
    

    }

  /**

  • 公钥解密

  • @param data

  •        待解密数据
    

  • @param key

  •        公钥
    

  • @return byte[] 解密数据

  • @throws Exception
    

    */
    

    public static byte[] decryptByPublicKey(byte[] data, byte[] key)
    

    throws Exception {

    // 取得公钥
    

    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);

    // 生成公钥
    

    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // 对数据解密
    

    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, publicKey);

    return cipher.doFinal(data);
    

    }

  /**

  • 公钥加密

  • @param data

  •        待加密数据
    

  • @param key

  •        公钥
    

  • @return byte[] 加密数据

  • @throws Exception
    

    */
    

    public static byte[] encryptByPublicKey(byte[] data, byte[] key)
    

    throws Exception {

    // 取得公钥
    

    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);

    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // 对数据加密
    

    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.ENCRYPT_MODE, publicKey);

    int blockSize = cipher.getBlockSize();
    

    if(blockSize>0){
    

    int outputSize = cipher.getOutputSize(data.length);
    

    int leavedSize = data.length % blockSize;
    

    int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
    

    : data.length / blockSize;
    

    byte[] raw = new byte[outputSize * blocksSize];
    

    int i = 0,remainSize=0;
    

    while ((remainSize = data.length - i * blockSize) > 0) {
    

    int inputLen = remainSize > blockSize?blockSize:remainSize;
    

    cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);
    

    i++;
    

    }
    

    return raw;
    

    }
    

    return cipher.doFinal(data);
    

    }

  /**

  • 私钥加密

  • @param data

  •        待加密数据
    

  • @param key

  •        私钥
    

  • @return byte[] 加密数据

  • @throws Exception
    

    */
    

    public static byte[] encryptByPrivateKey(byte[] data, byte[] key)
    

    throws Exception {

    // 取得私钥
    

    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM_RSA);

    // 生成私钥
    

    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);

    // 对数据加密
    

    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.ENCRYPT_MODE, privateKey);

    int blockSize = cipher.getBlockSize();
    

    if(blockSize>0){
    

    int outputSize = cipher.getOutputSize(data.length);
    

    int leavedSize = data.length % blockSize;
    

    int blocksSize = leavedSize != 0 ? data.length / blockSize + 1
    

    : data.length / blockSize;
    

    byte[] raw = new byte[outputSize * blocksSize];
    

    int i = 0,remainSize=0;
    

    while ((remainSize = data.length - i * blockSize) > 0) {
    

    int inputLen = remainSize > blockSize?blockSize:remainSize;
    

    cipher.doFinal(data, i * blockSize, inputLen, raw, i * outputSize);
    

    i++;
    

    }
    

    return raw;
    

    }
    

    return cipher.doFinal(data);
    

    }

  /**

  • 取得私钥
  • @param keyMap

  •        密钥Map
    

  • @return key 私钥
  • @throws Exception
    

    */
    

    public static Key getPrivateKey(Map<String, Key> keyMap)
    

    throws Exception {
    

    return keyMap.get(RSA_PRIVATE_KEY);
    

    }

  /**

  • 取得私钥
  • @param keyMap

  •        密钥Map
    

  • @return byte[] 私钥
  • @throws Exception
    

    */
    

    public static byte[] getPrivateKeyByte(Map<String, Key> keyMap)
    

    throws Exception {
    

    return keyMap.get(RSA_PRIVATE_KEY).getEncoded();
    

    }

  /**

  • 取得公钥
  • @param keyMap

  •        密钥Map
    

  • @return key 公钥
  • @throws Exception
    

    */
    

    public static Key getPublicKey(Map<String, Key> keyMap)
    

    throws Exception {
    

    return keyMap.get(RSA_PUBLIC_KEY);
    

    }

  /**

  • 取得公钥
  • @param keyMap

  •        密钥Map
    

  • @return byte[] 公钥
  • @throws Exception
    

    */
    

    public static byte[] getPublicKeyByte(Map<String, Key> keyMap)
    

    throws Exception {
    

    return keyMap.get(RSA_PUBLIC_KEY).getEncoded();
    

    }

  /**

  • 初始化密钥

  • @param byte[] seed 种子

  • @return Map 密钥Map

  • @throws Exception
    

    */
    

    public static Map<String,Key> initKey(byte[] seed)throws Exception{
    

    // 实例化密钥对生成器
    

    KeyPairGenerator keyPairGen = KeyPairGenerator
    

    .getInstance(KEY_ALGORITHM_RSA);

    // 初始化密钥对生成器
    

    keyPairGen.initialize(KEY_SIZE, new SecureRandom(seed) );

    // 生成密钥对
    

    KeyPair keyPair = keyPairGen.generateKeyPair();

    // 公钥
    

    RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();

    // 私钥
    

    RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();

    // 封装密钥
    

    Map<String, Key> keyMap = new HashMap<String, Key>(2);

    keyMap.put(RSA_PUBLIC_KEY, publicKey);
    

    keyMap.put(RSA_PRIVATE_KEY, privateKey);

    return keyMap;
    

    }

  /**

  • 初始化密钥
  • @param seed 种子
  • @return Map 密钥Map
  • @throws Exception
    

    */
    

    public static Map<String,Key> initKey(String seed)throws Exception{
    

    return initKey(seed.getBytes());
    

    }

  /**

  • 初始化密钥
  • @return Map 密钥Map
  • @throws Exception
    

    */
    

    public static Map<String, Key> initKey() throws Exception {
    

    return initKey(UUID.randomUUID().toString().getBytes());
    

    }

  public static PublicKey getPublicRSAKey(String key) throws Exception {
  

  X509EncodedKeySpec x509 = new X509EncodedKeySpec(Base64.decode(key));
  

  KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
  

  return kf.generatePublic(x509);
  

  }

  public static PrivateKey getPrivateRSAKey(String key) throws Exception {
  

  PKCS8EncodedKeySpec pkgs8 = new PKCS8EncodedKeySpec(Base64.decode(key));
  

  KeyFactory kf = KeyFactory.getInstance(KEY_ALGORITHM_RSA);
  

  return kf.generatePrivate(pkgs8);
  

  }

}

以上是 java 加密工具类（MD5、RSA、AES等加密方式） 的全部内容， 来源链接： utcz.com/z/392221.html