如何從數據庫中存儲和讀取公鑰？我正在使用postgresql和java

Question

您好我需要存儲和讀取postgresql數據庫中的公鑰，我正在使用java。

我有這樣的代碼來存儲

cbd.ejecutarSeguro("update persona set llave_publica = ? where cedula = 112345678", x509EncodedKeySpec.getEncoded()); 


    public void ejecutarSeguro(String query, byte[] pkBytes) { 
     try { 
      Connection conn = DriverManager.getConnection(nombreConexion); 
      PreparedStatement pstat; 

      pstat = conn.prepareStatement(query); 
      pstat.setBytes(1, pkBytes); 
      pstat.execute(); 
     } catch (SQLException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 

    } 

讀書，我用這個

String filePublicKey_s = cbd.consultarArray("Select llave_publica from persona where cedula = 112345678").get(0).get(0); 
     byte[] encodedPublicKey = new byte[(int) filePublicKey.length()]; 
     //encodedPublicKey = (filePublicKey_s).substring(2).getBytes(); 
     System.out.println("Public Key; "+filePublicKey_s); 
     System.out.println("rescato de la base; "+(filePublicKey_s).getBytes());// LA que rescato de la base 
     fis.read(encodedPublicKey); 
     System.out.println("Public Key; "+encodedPublicKey); 
     fis.close(); 

在例子中，我在我的計算機中的文件...公鑰的時候我比較輸出我看到這個

Public Key: 308201b83082012c06072a8648ce3804013082011f02818100fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80b6512669455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b801d346ff26660b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c61bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554135a169132f675f3ae2b61d72aeff22203199dd14801c70215009760508f15230bccb292b982a2eb840bf0581cf502818100f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa3aea82f9574c0b3d0782675159578ebad4594fe67107108180b449167123e84c281613b7cf09328cc8a6e13c167a8b547c8d28e0a3ae1e2bb3a675916ea37f0bfa213562f1fb627a01243bcca4f1bea8519089a883dfe15ae59f06928b665e807b552564014c3bfecf492a038185000281810096e492622ca7f93f51b96d44f15e69f6711b1eecc308f4b017a0e12b46a722b1b662a072f0cdf61b6853595f66eed2e697a4ba2af60f4eb78a24a169513acc6238dcbf6dc898a271d7f91b4b6ea4d2a5c504ee6970c7cd565d414d14305c786385558f06e47f3d2744fa0d73acdc3ca75e435a3a70dcebb1f997a02e7e96ab30 
Public Key; \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 
From data base; [B@6a162595 
From file; [B@53fd8f9 

如果我從數據庫中讀取的PK，我讀的\ x和所有的PK變化

謝謝

Answer 1

您可以存儲在Blob中，您可以讀取公鑰文件並獲取java公鑰對象。您可以直接將此公鑰對象作爲blob存儲在數據庫中。首先要做的是：

byte [] bytes = publicKey.getEncoded(); 

然後在數據庫中存儲字節。 對於檢索公鑰做的：

public PublicKey blobToPublicKey(final byte[] blob) 
    { 
     Object result = null; 
     final ByteArrayInputStream bais = new ByteArrayInputStream(blob); 
     ObjectInputStream ois; 
     try 
     { 
      ois = new ObjectInputStream(bais); 
      result = ois.readObject(); 
     } 
     catch (final IOException e) 
     { 
      // 
     } 
     catch (final ClassNotFoundException e) 
     { 
      // 
     } 
     return (PublicKey)result; 
    } 

Answer 2

轉換的公鑰成字節數組

byte[] bytes = publicKey.getEncoded(); 

寫字節的BLOB或BINARY列

...    
PreparedStatement ps = conn.prepareStatement("update tbl1 set col1=?"); 
ps.setBytes(1, bytes); 
ps.executeUpdate(); 

讀回一個字節陣列

... 
byte[] bytes = resultSet.getBytes(1); 

將字節轉換回公鑰

KeyFactory keyFactory = KeyFactory.getInstance(alg); 
X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(bytes); 
PublicKey pk = keyFactory.generatePublic(publicKeySpec);