JAVA加密算法（DSA）

時間  2019-11-29
標籤 java 加密 算法 dsa 欄目 Java 简体版
原文   原文鏈接

DSA 
DSA-Digital Signature Algorithm 是Schnorr和ElGamal簽名算法的變種，被美國NIST做爲DSS(DigitalSignature Standard)。簡單的說，這是一種更高級的驗證方式，用做數字簽名。不僅僅只有公鑰、私鑰，還有數字簽名。私鑰加密生成數字簽名，公鑰驗證數據及簽名。若是數據和簽名不匹配則認爲驗證失敗！也就是說傳輸中的數據能夠再也不加密，接收方得到數據後，拿到公鑰與簽名比對數據是否有效！ 

經過java代碼實現以下：Coder類見 java加密技術（一） 
Java代碼 java

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.Signature;   
import java.security.spec.PKCS8EncodedKeySpec;   
import java.security.spec.X509EncodedKeySpec;   
import java.util.HashMap;   
import java.util.Map;   
  
  
/**  
* DSA安全編碼組件  
*   
*/  
public abstract class DSACoder extends Coder {   
    /**  
     * 能夠使用DSA方式得到簽名，也能夠使用RSA方式得到簽名，注意成對兒出現。  
     *   
     * <code>  
     * public static final String KEY_ALGORITHM = "RSA";  
     * public static final String SIGNATURE_ALGORITHM = "MD5withRSA";  
     * </code>  
     **/  
    public static final String KEY_ALGORITHM = "DSA";   
    public static final String SIGNATURE_ALGORITHM = "DSA";   
  
    /**  
     * 默認種子  
     */  
    private static final String DEFAULT_SEED = "0f22507a10bbddd07d8a3082122966e3";   
  
    private static final String PUBLIC_KEY = "DSAPublicKey";   
    private static final String PRIVATE_KEY = "DSAPrivateKey";   
  
    /**  
     * 用私鑰對信息生成數字簽名  
     *   
     * @param data  
     *            加密數據  
     * @param privateKey  
     *            私鑰  
     * @return  
     * @throws Exception  
     */  
    public static String sign(byte[] data, String privateKey) throws Exception {   
        // 解密由base64編碼的私鑰   
        byte[] keyBytes = decryptBASE64(privateKey);   
  
        // 構造PKCS8EncodedKeySpec對象   
        PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);   
  
        // KEY_ALGORITHM 指定的加密算法   
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
  
        // 取私鑰匙對象   
        PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);   
  
        // 用私鑰對信息生成數字簽名   
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);   
        signature.initSign(priKey);   
        signature.update(data);   
  
        return encryptBASE64(signature.sign());   
    }   
  
    /**  
     * 校驗數字簽名  
     * @param data  
     *            加密數據  
     * @param publicKey  
     *            公鑰  
     * @param sign  
     *            數字簽名  
     *   
     * @return 校驗成功返回true 失敗返回false  
     * @throws Exception  
     *   
     */  
    public static boolean verify(byte[] data, String publicKey, String sign)   
            throws Exception {   
  
        // 解密由base64編碼的公鑰   
        byte[] keyBytes = decryptBASE64(publicKey);   
  
        // 構造X509EncodedKeySpec對象   
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);   
  
        // KEY_ALGORITHM 指定的加密算法   
        KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);   
  
        // 取公鑰匙對象   
        PublicKey pubKey = keyFactory.generatePublic(keySpec);   
  
        Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);   
        signature.initVerify(pubKey);   
        signature.update(data);   
  
        // 驗證簽名是否正常   
        return signature.verify(decryptBASE64(sign));   
    }   
  
    /**  
     * 生成密鑰  
     *   
     * @param seed  
     *            種子  
     * @return 密鑰對象  
     * @throws Exception  
     */  
    public static Map<String, Object> initKey(String seed) throws Exception {   
        KeyPairGenerator keygen = KeyPairGenerator.getInstance(KEY_ALGORITHM);   
        // 初始化隨機產生器   
        SecureRandom secureRandom = new SecureRandom();   
        secureRandom.setSeed(seed.getBytes());   
        keygen.initialize(1024, secureRandom);   
  
        KeyPair keys = keygen.genKeyPair();   
  
        PublicKey publicKey = keys.getPublic();   
        PrivateKey privateKey = keys.getPrivate();   
  
        Map<String, Object> map = new HashMap<String, Object>(2);   
        map.put(PUBLIC_KEY, publicKey);   
        map.put(PRIVATE_KEY, privateKey);   
  
        return map;   
    }   
  
    /**  
     * 默認生成密鑰  
     *   
     * @return 密鑰對象  
     * @throws Exception  
     */  
    public static Map<String, Object> initKey() throws Exception {   
        return initKey(DEFAULT_SEED);   
    }   
  
    /**  
     * 取得私鑰  
     *   
     * @param keyMap  
     * @return  
     * @throws Exception  
     */  
    public static String getPrivateKey(Map<String, Object> keyMap)   
            throws Exception {   
        Key key = (Key) keyMap.get(PRIVATE_KEY);   
  
        return encryptBASE64(key.getEncoded());   
    }   
  
    /**  
     * 取得公鑰  
     *   
     * @param keyMap  
     * @return  
     * @throws Exception  
     */  
    public static String getPublicKey(Map<String, Object> keyMap)   
            throws Exception {   
        Key key = (Key) keyMap.get(PUBLIC_KEY);   
  
        return encryptBASE64(key.getEncoded());   
    }   
}  

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.Signature; 
import java.security.spec.PKCS8EncodedKeySpec; 
import java.security.spec.X509EncodedKeySpec; 
import java.util.HashMap; 
import java.util.Map; 


/** 
* DSA安全編碼組件 
* 
*/ 
public abstract class DSACoder extends Coder { 
/** 
* 能夠使用DSA方式得到簽名，也能夠使用RSA方式得到簽名，注意成對兒出現。 
* 
* <code> 
* public static final String KEY_ALGORITHM = "RSA"; 
* public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; 
* </code> 
**/ 
public static final String KEY_ALGORITHM = "DSA"; 
public static final String SIGNATURE_ALGORITHM = "DSA"; 

/** 
* 默認種子 
*/ 
private static final String DEFAULT_SEED = "0f22507a10bbddd07d8a3082122966e3"; 

private static final String PUBLIC_KEY = "DSAPublicKey"; 
private static final String PRIVATE_KEY = "DSAPrivateKey"; 

/** 
* 用私鑰對信息生成數字簽名 
* 
* @param data 
*            加密數據 
* @param privateKey 
*            私鑰 
* @return 
* @throws Exception 
*/ 
public static String sign(byte[] data, String privateKey) throws Exception { 
// 解密由base64編碼的私鑰 
byte[] keyBytes = decryptBASE64(privateKey); 

// 構造PKCS8EncodedKeySpec對象 
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes); 

// KEY_ALGORITHM 指定的加密算法 
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); 

// 取私鑰匙對象 
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec); 

// 用私鑰對信息生成數字簽名 
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); 
signature.initSign(priKey); 
signature.update(data); 

return encryptBASE64(signature.sign()); 
} 

/** 
* 校驗數字簽名 
* @param data 
*            加密數據 
* @param publicKey 
*            公鑰 
* @param sign 
*            數字簽名 
* 
* @return 校驗成功返回true 失敗返回false 
* @throws Exception 
* 
*/ 
public static boolean verify(byte[] data, String publicKey, String sign) 
throws Exception { 

// 解密由base64編碼的公鑰 
byte[] keyBytes = decryptBASE64(publicKey); 

// 構造X509EncodedKeySpec對象 
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes); 

// KEY_ALGORITHM 指定的加密算法 
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM); 

// 取公鑰匙對象 
PublicKey pubKey = keyFactory.generatePublic(keySpec); 

Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM); 
signature.initVerify(pubKey); 
signature.update(data); 

// 驗證簽名是否正常 
return signature.verify(decryptBASE64(sign)); 
} 

/** 
* 生成密鑰 
* 
* @param seed 
*            種子 
* @return 密鑰對象 
* @throws Exception 
*/ 
public static Map<String, Object> initKey(String seed) throws Exception { 
KeyPairGenerator keygen = KeyPairGenerator.getInstance(KEY_ALGORITHM); 
// 初始化隨機產生器 
SecureRandom secureRandom = new SecureRandom(); 
secureRandom.setSeed(seed.getBytes()); 
keygen.initialize(1024, secureRandom); 

KeyPair keys = keygen.genKeyPair(); 

PublicKey publicKey = keys.getPublic(); 
PrivateKey privateKey = keys.getPrivate(); 

Map<String, Object> map = new HashMap<String, Object>(2); 
map.put(PUBLIC_KEY, publicKey); 
map.put(PRIVATE_KEY, privateKey); 

return map; 
} 

/** 
* 默認生成密鑰 
* 
* @return 密鑰對象 
* @throws Exception 
*/ 
public static Map<String, Object> initKey() throws Exception { 
return initKey(DEFAULT_SEED); 
} 

/** 
* 取得私鑰 
* 
* @param keyMap 
* @return 
* @throws Exception 
*/ 
public static String getPrivateKey(Map<String, Object> keyMap) 
throws Exception { 
Key key = (Key) keyMap.get(PRIVATE_KEY); 

return encryptBASE64(key.getEncoded()); 
} 

/** 
* 取得公鑰 
* 
* @param keyMap 
* @return 
* @throws Exception 
*/ 
public static String getPublicKey(Map<String, Object> keyMap) 
throws Exception { 
Key key = (Key) keyMap.get(PUBLIC_KEY); 

return encryptBASE64(key.getEncoded()); 
} 
} 


不只能夠使用DSA算法，一樣也能夠使用RSA算法作數字簽名，但要注意成對出現： 
public static final String KEY_ALGORITHM = "RSA"; 
public static final String SIGNATURE_ALGORITHM = "MD5withRSA"; 

再給出一個測試類： 
Java代碼 
import static org.junit.Assert.*;   
  
import java.util.Map;   
  
import org.junit.Test;   
  
/**  
*   
*/  
public class DSACoderTest {   
  
    @Test  
    public void test() throws Exception {   
        String inputStr = "abc";   
        byte[] data = inputStr.getBytes();   
  
        // 構建密鑰   
        Map<String, Object> keyMap = DSACoder.initKey();   
  
        // 得到密鑰   
        String publicKey = DSACoder.getPublicKey(keyMap);   
        String privateKey = DSACoder.getPrivateKey(keyMap);   
  
        System.err.println("公鑰:\r" + publicKey);   
        System.err.println("私鑰:\r" + privateKey);   
  
        // 產生簽名   
        String sign = DSACoder.sign(data, privateKey);   
        System.err.println("簽名:\r" + sign);   
  
        // 驗證簽名   
        boolean status = DSACoder.verify(data, publicKey, sign);   
        System.err.println("狀態:\r" + status);   
        assertTrue(status);   
  
    }   
  
}  

import static org.junit.Assert.*; 

import java.util.Map; 

import org.junit.Test; 

/** 
* 
*/ 
public class DSACoderTest { 

@Test 
public void test() throws Exception { 
String inputStr = "abc"; 
byte[] data = inputStr.getBytes(); 

// 構建密鑰 
Map<String, Object> keyMap = DSACoder.initKey(); 

// 得到密鑰 
String publicKey = DSACoder.getPublicKey(keyMap); 
String privateKey = DSACoder.getPrivateKey(keyMap); 

System.err.println("公鑰:\r" + publicKey); 
System.err.println("私鑰:\r" + privateKey); 

// 產生簽名 
String sign = DSACoder.sign(data, privateKey); 
System.err.println("簽名:\r" + sign); 

// 驗證簽名 
boolean status = DSACoder.verify(data, publicKey, sign); 
System.err.println("狀態:\r" + status); 
assertTrue(status); 

}
}

控制檯輸出： 
Console代碼 
公鑰:   
MIIBtzCCASwGByqGSM44BAEwggEfAoGBAP1/U4EddRIpUt9KnC7s5Of2EbdSPO9EAMMeP4C2USZp   
RV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVClpJ+f6AR7ECLCT7up1/63xhv4O1fn   
xqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith1yrv8iIDGZ3RSAHHAhUAl2BQjxUjC8yykrmCouuE   
C/BYHPUCgYEA9+GghdabPd7LvKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCBgLRJ   
FnEj6EwoFhO3zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhRkImo   
g9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoDgYQAAoGAIu4RUlcQLp49PI0MrbssOY+3uySVnp0TULSv   
5T4VaHoKzsLHgGTrwOvsGA+V3yCNl2WDu3D84bSLF7liTWgOj+SMOEaPk4VyRTlLXZWGPsf1Mfd9   
21XAbMeVyKDSHHVGbMjBScajf3bXooYQMlyoHiOt/WrCo+mv7efstMM0PGo=   
  
私鑰:   
MIIBTAIBADCCASwGByqGSM44BAEwggEfAoGBAP1/U4EddRIpUt9KnC7s5Of2EbdSPO9EAMMeP4C2   
USZpRV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVClpJ+f6AR7ECLCT7up1/63xhv4   
O1fnxqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith1yrv8iIDGZ3RSAHHAhUAl2BQjxUjC8yykrmC   
ouuEC/BYHPUCgYEA9+GghdabPd7LvKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCB   
gLRJFnEj6EwoFhO3zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhR   
kImog9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoEFwIVAIegLUtmm2oQKQJTOiLugHTSjl/q   
  
簽名:   
MC0CFQCMg0J/uZmF8GuRpr3TNq48w60nDwIUJCyYNah+HtbU6NcQfy8Ac6LeLQs=   
  
狀態:   
true  

公鑰: 
MIIBtzCCASwGByqGSM44BAEwggEfAoGBAP1/U4EddRIpUt9KnC7s5Of2EbdSPO9EAMMeP4C2USZp 
RV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVClpJ+f6AR7ECLCT7up1/63xhv4O1fn 
xqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith1yrv8iIDGZ3RSAHHAhUAl2BQjxUjC8yykrmCouuE 
C/BYHPUCgYEA9+GghdabPd7LvKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCBgLRJ 
FnEj6EwoFhO3zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhRkImo 
g9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoDgYQAAoGAIu4RUlcQLp49PI0MrbssOY+3uySVnp0TULSv 
5T4VaHoKzsLHgGTrwOvsGA+V3yCNl2WDu3D84bSLF7liTWgOj+SMOEaPk4VyRTlLXZWGPsf1Mfd9 
21XAbMeVyKDSHHVGbMjBScajf3bXooYQMlyoHiOt/WrCo+mv7efstMM0PGo= 

私鑰: 
MIIBTAIBADCCASwGByqGSM44BAEwggEfAoGBAP1/U4EddRIpUt9KnC7s5Of2EbdSPO9EAMMeP4C2 
USZpRV1AIlH7WT2NWPq/xfW6MPbLm1Vs14E7gB00b/JmYLdrmVClpJ+f6AR7ECLCT7up1/63xhv4 
O1fnxqimFQ8E+4P208UewwI1VBNaFpEy9nXzrith1yrv8iIDGZ3RSAHHAhUAl2BQjxUjC8yykrmC 
ouuEC/BYHPUCgYEA9+GghdabPd7LvKtcNrhXuXmUr7v6OuqC+VdMCz0HgmdRWVeOutRZT+ZxBxCB 
gLRJFnEj6EwoFhO3zwkyjMim4TwWeotUfI0o4KOuHiuzpnWRbqN/C/ohNWLx+2J6ASQ7zKTxvqhR 
kImog9/hWuWfBpKLZl6Ae1UlZAFMO/7PSSoEFwIVAIegLUtmm2oQKQJTOiLugHTSjl/q 

簽名: 
MC0CFQCMg0J/uZmF8GuRpr3TNq48w60nDwIUJCyYNah+HtbU6NcQfy8Ac6LeLQs= 

狀態: 
true git

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