Examples of java.security.KeyFactory

java.security.KeyFactory
Key factories are used to convert keys (opaque cryptographic keys of type Key) into key specifications (transparent representations of the underlying key material), and vice versa.
Key factories are bi-directional. That is, they allow you to build an opaque key object from a given key specification (key material), or to retrieve the underlying key material of a key object in a suitable format.
Multiple compatible key specifications may exist for the same key. For example, a DSA public key may be specified using DSAPublicKeySpec or X509EncodedKeySpec. A key factory can be used to translate between compatible key specifications.
The following is an example of how to use a key factory in order to instantiate a DSA public key from its encoding. Assume Alice has received a digital signature from Bob. Bob also sent her his public key (in encoded format) to verify his signature. Alice then performs the following actions:
```
 X509EncodedKeySpec bobPubKeySpec = new X509EncodedKeySpec(bobEncodedPubKey); KeyFactory keyFactory = KeyFactory.getInstance("DSA"); PublicKey bobPubKey = keyFactory.generatePublic(bobPubKeySpec); Signature sig = Signature.getInstance("DSA"); sig.initVerify(bobPubKey); sig.update(data); sig.verify(signature); 
```
@author Jan Luehe @version 1.35, 04/21/06 @see Key @see PublicKey @see PrivateKey @see java.security.spec.KeySpec @see java.security.spec.DSAPublicKeySpec @see java.security.spec.X509EncodedKeySpec @since 1.2

    }


    private PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = Base64.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }

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    }


    private PublicKey loadPublicKey(String filePath, String algorithm) throws Exception {
        String fileData = new String(JavaUtils.getBytesFromFile(getControlFilePath(filePath)));
        byte[] keyBytes = Base64.decode(fileData);
        KeyFactory kf = KeyFactory.getInstance(algorithm);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
        return kf.generatePublic(keySpec);
    }

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        byte[] pkcs8Bytes = JavaUtils.getBytesFromFile(filename);
        PKCS8EncodedKeySpec pkcs8Spec = new PKCS8EncodedKeySpec(pkcs8Bytes);


        // Create a key factory 
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        rsaKey = keyFactory.generatePrivate(pkcs8Spec);
    }

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         try {
            String identity = in.identity;
            String pem = in.credential;


            // extract private key
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            PrivateKey privateKey = keyFactory.generatePrivate(Pems.privateKeySpec(Payloads.newStringPayload(pem)));


            // extract certificate(s)
            Collection<X509Certificate> certs = x509Certificates(pem);


            return new FGCPCredentials.Builder().identity(identity).credential(pem)

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     * @param pubKeyInfo SubjectPublicKeyInfo instance containing the public key information.
     */
    public static PublicKey getPublicKeyObject(SubjectPublicKeyInfo pubKeyInfo) throws Exception{
        RSAPublicKeyStructure pubkeyStruct = new RSAPublicKeyStructure((ASN1Sequence)pubKeyInfo.getPublicKey());
        RSAPublicKeySpec pubkeySpec = new RSAPublicKeySpec(pubkeyStruct.getModulus(), pubkeyStruct.getPublicExponent());
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey pubKey = keyFactory.generatePublic(pubkeySpec);
        return pubKey;
    }

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            return x.toJCEKeyPair();
        }
        if (key instanceof com.trilead.ssh2.signature.DSAPrivateKey) {
            com.trilead.ssh2.signature.DSAPrivateKey x = (com.trilead.ssh2.signature.DSAPrivateKey)key;
            KeyFactory kf = KeyFactory.getInstance("DSA");
//            System.out.println("ssh-dsa " + new String(Base64.encode(DSASHA1Verify.encodeSSHDSAPublicKey(x.getPublicKey()))));


            return new KeyPair(
                    kf.generatePublic(new DSAPublicKeySpec(x.getY(), x.getP(), x.getQ(), x.getG())),
                    kf.generatePrivate(new DSAPrivateKeySpec(x.getX(), x.getP(), x.getQ(), x.getG())));
        }


        throw new UnsupportedOperationException("Unrecognizable key format: "+key);
    }

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        PemReader reader = new PemReader(new StringReader(s));
        PemObject pemObject = reader.readPemObject();
        reader.close();


        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pemObject.getContent());
        KeyFactory kf = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = kf.generatePrivate(keySpec);
        if (privateKey instanceof RSAPrivateCrtKey) {
          RSAPrivateCrtKey rsaPrivateCrtKey = (RSAPrivateCrtKey) privateKey;
          RSAPublicKeySpec publicKeySpec = new java.security.spec.RSAPublicKeySpec(
              rsaPrivateCrtKey.getModulus(), rsaPrivateCrtKey.getPublicExponent());
          PublicKey publicKey = kf.generatePublic(publicKeySpec);
          key = new KeyPair(publicKey, privateKey);
        } else {
          key = privateKey;
        }
      } catch (Exception e) {

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  private PrivateKey tryParsePemFormat(String data) {
    try {
      byte[] encoded = Base64.decode(data);
      PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded);
      KeyFactory kf = KeyFactory.getInstance("RSA");
      PrivateKey privKey = kf.generatePrivate(keySpec);


      return privKey;
    } catch (Exception e) {
      log.debug("Error parsing pem data", e);
      return null;

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  }


  public static PublicKey deserializePublicKey(byte[] keyData) {
    X509EncodedKeySpec pubKeySpec = new X509EncodedKeySpec(keyData);


    KeyFactory keyFactory = getKeyFactory();


    PublicKey pubKey;
    try {
      pubKey = keyFactory.generatePublic(pubKeySpec);
    } catch (InvalidKeySpecException e) {
      throw new IllegalArgumentException("Error deserializing public key", e);
    }
    return pubKey;
  }

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  }


  public static PrivateKey deserializePrivateKey(byte[] keyData) {
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyData);


    KeyFactory keyFactory = getKeyFactory();


    PrivateKey privateKey;
    try {
      privateKey = keyFactory.generatePrivate(keySpec);
    } catch (InvalidKeySpecException e) {
      throw new IllegalArgumentException("Error deserializing private key", e);
    }
    return privateKey;
  }

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