Seules les clés RSAPrivate (Crt) KeySpec et PKCS8EncodedKeySpec sont prises en charge pour les clés privées RSA

Question

Je suis les étapes suivantes à partir du lien: How to read .pem file to get private and public key. J'ai exécuté les trois commandes suivantes:

1. $openssl genrsa -out mykey.pem 2048 
2. $openssl pkcs8 -topk8 -inform PEM -outform PEM -in mykey.pem -out private_key.pem -nocrypt 
3. $ openssl rsa -in mykey.pem -pubout -outform DER -out public_key.der 

Cela a créé trois fichiers, mais quand je tentais de les lire dans le code Java je commencé à faire face ci-dessous erreur:

PUBLIC KEY EXPO : 65537 
Only RSAPrivate(Crt)KeySpec and PKCS8EncodedKeySpec supported for RSA private keys 

Mon code de référence:

public class PublicPrivateKeyDemo { 
    private static File privateKeyFile = null; 
    private static File publicKeyFile = null; 

    public static void main(String[] args) { 
     String path = "C:/Users/test898/keys"; 
     privateKeyFile = new File(path + "/" + "private.pem"); 
     publicKeyFile = new File(path + "/" + "public.der"); 

     try { 
      loadkeys(); 
     } catch (IOException | GeneralSecurityException e) { 
      System.out.println(e.getMessage()); 
     } 
    } 

    private static void loadkeys() throws IOException, GeneralSecurityException { 
     byte[] publicKeyBytes = new byte[(int) publicKeyFile.length()]; 
     FileInputStream publicFis = null; 
     publicFis = new FileInputStream(publicKeyFile); 
     if (publicFis.read(publicKeyBytes) > 0) { 
      X509EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes); 
      KeyFactory factory = KeyFactory.getInstance("RSA"); 
      RSAPublicKey pubKey = (RSAPublicKey) factory.generatePublic(publicKeySpec); 
      BigInteger pKeyModulus = pubKey.getModulus(); 
      BigInteger pKeyExponent = pubKey.getPublicExponent(); 
      System.out.println("PUBLIC KEY EXPO : "+pKeyExponent); 

     } 

     byte[] privateKeyBytes = new byte[(int) privateKeyFile.length()]; 
     FileInputStream privateFis = null; 
     privateFis = new FileInputStream(privateKeyFile); 
     if (privateFis.read(privateKeyBytes) > 0) { 
      //PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(privateKeyBytes); 
      X509EncodedKeySpec spec = new X509EncodedKeySpec(privateKeyBytes); 
      KeyFactory keyFactory = KeyFactory.getInstance("RSA"); 
      RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(spec); 
      BigInteger pKeyModulus = privKey.getModulus(); 
      BigInteger pKeyExponent = privKey.getPrivateExponent(); 
      System.out.println("PRIVATE KEY : "+pKeyExponent); 
     } 
    } 
} 

S'il vous plaît aidez-moi ce qui ne va pas ici? Je suppose que la clé privée doit donner une valeur quelque chose simillar comme ci-dessous ":

21150549370950609585296765828149303178265715265804890679831411170495636016527926323370428466362501818569080118374307191403222367256185274427528812911191842330928112748042350818573390540259857225467392220170770506599589136056049534085562156615813126185240565396115577449461468695709719589257257375788267753694280485882595576829517086782992300102288858453543505912425724874212273830247789870669315715724390578125469483751830964757980799543436412647956770560679365767737577100276745456138533646455249170660612983618544127693626739283128573829732806886889896396374650462743743148634276240986662548043510018342217214342529 

Answer 1

Comme par le lien: http://codeartisan.blogspot.in/2009/05/public-key-cryptography-in-java.html Vous devriez essayer le ci-dessous

Générez une clé privée RSA 2048 bits

$ openssl genrsa -out private_key.pem 2048 

Convertir la clé privée au format PKCS # 8 (afin que Java puisse le lire)

$ openssl pkcs8 -topk8 -inform PEM -outform DER -in private_key.pem -out private_key.der -nocrypt 

sortie partie clé publique au format DER (si Java peut le lire)

$ openssl rsa -in private_key.pem -pubout -outform DER -out public_key.der 

Vous pouvez lire le code java comme ci-dessous:

import java.io.DataInputStream; 
    import java.io.File; 
    import java.io.FileInputStream; 
    import java.io.IOException; 
    import java.security.KeyFactory; 
    import java.security.NoSuchAlgorithmException; 
    import java.security.interfaces.RSAPrivateKey; 
    import java.security.interfaces.RSAPublicKey; 
    import java.security.spec.InvalidKeySpecException; 
    import java.security.spec.PKCS8EncodedKeySpec; 
    import java.security.spec.X509EncodedKeySpec; 

    public class Demo { 

     public static final String PRIVATE_KEY="/home/user/private.der"; 
     public static final String PUBLIC_KEY="/home/user/public.der"; 

     public static void main(String[] args) throws IOException, NoSuchAlgorithmException, InvalidKeySpecException { 
      //get the private key 
      File file = new File(PRIVATE_KEY); 
      FileInputStream fis = new FileInputStream(file); 
      DataInputStream dis = new DataInputStream(fis); 

      byte[] keyBytes = new byte[(int) file.length()]; 
      dis.readFully(keyBytes); 
      dis.close(); 

      PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes); 
      KeyFactory kf = KeyFactory.getInstance("RSA"); 
      RSAPrivateKey privKey = (RSAPrivateKey) kf.generatePrivate(spec); 
      System.out.println("Exponent :" + privKey.getPrivateExponent()); 
      System.out.println("Modulus" + privKey.getModulus()); 

      //get the public key 
      File file1 = new File(PUBLIC_KEY); 
      FileInputStream fis1 = new FileInputStream(file1); 
      DataInputStream dis1 = new DataInputStream(fis1); 
      byte[] keyBytes1 = new byte[(int) file1.length()]; 
      dis1.readFully(keyBytes1); 
      dis1.close(); 

      X509EncodedKeySpec spec1 = new X509EncodedKeySpec(keyBytes1); 
      KeyFactory kf1 = KeyFactory.getInstance("RSA"); 
      RSAPublicKey pubKey = (RSAPublicKey) kf1.generatePublic(spec1); 

      System.out.println("Exponent :" + pubKey.getPublicExponent()); 
      System.out.println("Modulus" + pubKey.getModulus()); 
     } 
    } 

Sortie du programme:

PUBLIC KEY EXPO : 65537 
PRIVATE KEY :0277459509106847714925918656002207273016950425690931486784061794302602299415224979080443644674838230854689682941689891752703570749249869153966528967635783430367525635094847999700308350727275663213969614628360232440655477057807291869565586695953970804798770095849408924111596670565606097668752646013504502815936286143578191877967720393294592625997337105475883689954727277867955887242546330469781268095607005541678733388864537898085207735975487415418212440417692928205650585590564551063589766600954407329