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 PrivateKey generatePrivateKey() throws Base64DecodingException,
      NoSuchAlgorithmException, InvalidKeySpecException {
    byte[] privateByte = Base64.decode(keyValue);
    EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateByte);


    KeyFactory keyFactory = KeyFactory.getInstance(idAlg);


    return keyFactory.generatePrivate(privateKeySpec);
  }

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      //cert = certStore.getCertificate("gdata");
      } catch (Exception x) { }
    }
      byte[] encodedKey = cert.getKey().getBytes();
      byte[] decodedBuffer = com.google.appengine.repackaged.com.google.common.util.Base64.decode(encodedKey);
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PKCS8EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(decodedBuffer);
        authSubKey = keyFactory.generatePrivate(privateKeySpec);
    } catch (Exception x) {
        log.log(Level.SEVERE, "AuthSub key generation failed: "  + x.getMessage(), x);
    }
  }
  return authSubKey;

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            PublicKey key;
            String keyAlg = getString();
            if (KeyPairProvider.SSH_RSA.equals(keyAlg)) {
                BigInteger e = getMPInt();
                BigInteger n = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                key = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
            } else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
                BigInteger p = getMPInt();
                BigInteger q = getMPInt();
                BigInteger g = getMPInt();
                BigInteger y = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
                key = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
            } else {
                throw new IllegalStateException("Unsupported algorithm: " + keyAlg);
            }
            return key;
        } catch (InvalidKeySpecException e) {

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                BigInteger qInv = getMPInt();
                BigInteger q = getMPInt();
                BigInteger p = getMPInt();
                BigInteger dP = d.remainder(p.subtract(BigInteger.valueOf(1)));
                BigInteger dQ = d.remainder(q.subtract(BigInteger.valueOf(1)));
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                pub = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
                prv = keyFactory.generatePrivate(new RSAPrivateCrtKeySpec(n, e, d, p, q, dP, dQ, qInv));
            } else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
                BigInteger p = getMPInt();
                BigInteger q = getMPInt();
                BigInteger g = getMPInt();
                BigInteger y = getMPInt();
                BigInteger x = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
                pub = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
                prv = keyFactory.generatePrivate(new DSAPrivateKeySpec(x, p, q, g));
            } else {
                throw new IllegalStateException("Unsupported algorithm: " + keyAlg);
            }
            return new KeyPair(pub, prv);
        } catch (InvalidKeySpecException e) {

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        return e_array;
    }


    @Override
    protected byte[] calculateK() throws Exception {
        KeyFactory myKeyFac = SecurityUtils.getKeyFactory("EC");
        ECPublicKeySpec keySpec = new ECPublicKeySpec(f, params);
        PublicKey yourPubKey = myKeyFac.generatePublic(keySpec);
        myKeyAgree.doPhase(yourPubKey, true);
        return stripLeadingZeroes(myKeyAgree.generateSecret());
    }

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        }
        return e_array;
    }


    protected byte[] calculateK() throws Exception {
        KeyFactory myKeyFac = SecurityUtils.getKeyFactory("DH");
        DHPublicKeySpec keySpec = new DHPublicKeySpec(f, p, g);
        PublicKey yourPubKey = myKeyFac.generatePublic(keySpec);
        myKeyAgree.doPhase(yourPubKey, true);
        return stripLeadingZeroes(myKeyAgree.generateSecret());
    }

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            PublicKey key;
            String keyAlg = getString();
            if (KeyPairProvider.SSH_RSA.equals(keyAlg)) {
                BigInteger e = getMPInt();
                BigInteger n = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                key = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
            } else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
                BigInteger p = getMPInt();
                BigInteger q = getMPInt();
                BigInteger g = getMPInt();
                BigInteger y = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
                key = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP256.equals(keyAlg)) {
                key = getRawECKey("nistp256", ECCurves.EllipticCurves.nistp256);
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP384.equals(keyAlg)) {
                key = getRawECKey("nistp384", ECCurves.EllipticCurves.nistp384);
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP521.equals(keyAlg)) {

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                BigInteger qInv = getMPInt();
                BigInteger q = getMPInt();
                BigInteger p = getMPInt();
                BigInteger dP = d.remainder(p.subtract(BigInteger.valueOf(1)));
                BigInteger dQ = d.remainder(q.subtract(BigInteger.valueOf(1)));
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("RSA");
                pub = keyFactory.generatePublic(new RSAPublicKeySpec(n, e));
                prv = keyFactory.generatePrivate(new RSAPrivateCrtKeySpec(n, e, d, p, q, dP, dQ, qInv));
            } else if (KeyPairProvider.SSH_DSS.equals(keyAlg)) {
                BigInteger p = getMPInt();
                BigInteger q = getMPInt();
                BigInteger g = getMPInt();
                BigInteger y = getMPInt();
                BigInteger x = getMPInt();
                KeyFactory keyFactory = SecurityUtils.getKeyFactory("DSA");
                pub = keyFactory.generatePublic(new DSAPublicKeySpec(y, p, q, g));
                prv = keyFactory.generatePrivate(new DSAPrivateKeySpec(x, p, q, g));
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP256.equals(keyAlg)) {
                return extractEC("nistp256", ECCurves.EllipticCurves.nistp256);
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP384.equals(keyAlg)) {
                return extractEC("nistp384", ECCurves.EllipticCurves.nistp384);
            } else if (KeyPairProvider.ECDSA_SHA2_NISTP521.equals(keyAlg)) {

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        ECPoint group = ECCurves.decodeECPoint(groupBytes, spec.getCurve());
        if (group == null) {
            throw new InvalidKeySpecException("Couldn't decode EC group");
        }


        KeyFactory keyFactory = SecurityUtils.getKeyFactory("EC");
        PublicKey pubKey = keyFactory.generatePublic(new ECPublicKeySpec(group, spec));
        PrivateKey privKey = keyFactory.generatePrivate(new ECPrivateKeySpec(exponent, spec));
        return new KeyPair(pubKey, privKey);
    }

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      throw new OAuthException("Private key string cannot be null");
    } else if (privateKeyString.length() == 0) {
      throw new OAuthException("Private key string cannot be empty");
    }
    try {
      KeyFactory fac = KeyFactory.getInstance("RSA");
      byte[] privateKeyBase64 = Base64.decode(privateKeyString);
      EncodedKeySpec privKeySpec = new PKCS8EncodedKeySpec(privateKeyBase64);
      privateKey = fac.generatePrivate(privKeySpec);
    } catch (NoSuchAlgorithmException e) {
      throw new OAuthException(e);
    } catch (Base64DecoderException e) {
      throw new OAuthException("Invalid private key", e);
    } catch (InvalidKeySpecException e) {

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