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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright (c) 2015-16, Princeton University. | ||
| All rights reserved. | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are | ||
| met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above | ||
| copyright notice, this list of conditions and the following disclaimer | ||
| in the documentation and/or other materials provided with the | ||
| distribution. | ||
| * Neither the name of Princeton University nor the names of its | ||
| contributors may be used to endorse or promote products derived from | ||
| this software without specific prior written permission. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND | ||
| CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, | ||
| INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | ||
| MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | ||
| CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
| LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
| OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
|
|
||
| package org.coniks.crypto; | ||
|
|
||
| import java.security.*; | ||
| import java.security.interfaces.*; | ||
| import java.security.spec.*; | ||
| import java.math.BigInteger; | ||
|
|
||
| /** Implements all encryption-key related operations that a | ||
| * CONIKS server must perform. | ||
| * Current encryption/signing algorithm used: RSA with SHA-256. | ||
| * | ||
| *@author Marcela S. Melara ([email protected]) | ||
| *@author Michael Rochlin | ||
| */ | ||
| public class Keys { | ||
|
|
||
| /** Generates a DSA key pair. | ||
| * | ||
| *@return the DSA key pair or null in case of an error. | ||
| */ | ||
| public static KeyPair generateDSAKeyPair() | ||
| throws NoSuchAlgorithmException { | ||
| KeyPairGenerator gen = KeyPairGenerator.getInstance("DSA"); | ||
| gen.initialize(1024); | ||
|
|
||
| KeyPair pair = gen.generateKeyPair(); | ||
|
|
||
| return pair; | ||
| } | ||
|
|
||
| /** Get the private key from the DSA key pair. | ||
| * | ||
| *@param kp The DSA KeyPair. | ||
| *@return the DSA private key. | ||
| */ | ||
| public static DSAPrivateKey getDSAPrivate(KeyPair kp) { | ||
| return (DSAPrivateKey)kp.getPrivate(); | ||
| } | ||
|
|
||
| /** Get the public key from the DSA key pair. | ||
| * | ||
| *@param kp The DSA KeyPair. | ||
| *@return the DSA public key. | ||
| */ | ||
| public static DSAPublicKey getDSAPublic(KeyPair kp) { | ||
| return (DSAPublicKey)kp.getPublic(); | ||
| } | ||
|
|
||
| /** Makes a {@link DSAPublicKey} from its {@code p}, {@code q}, | ||
| * {@code g} and {@code y} parameters. | ||
| * | ||
| *@return the DSAPublicKey, or {@code null} in case of an error. | ||
| */ | ||
| public static DSAPublicKey getDSAPublicFromParams(BigInteger p, BigInteger q, | ||
| BigInteger g, BigInteger y) { | ||
|
|
||
| DSAPublicKey pk = null; | ||
| try { | ||
| KeyFactory keyFactory = KeyFactory.getInstance("DSA"); | ||
| KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g); | ||
| pk = (DSAPublicKey)keyFactory.generatePublic(publicKeySpec); | ||
| } | ||
| // let's panic if an exception occurs | ||
| finally { | ||
| return pk; | ||
| } | ||
| } | ||
|
|
||
| /** Generates an RSA key pair. | ||
| * | ||
| *@return the RSA key pair or null in case of an error. | ||
| */ | ||
| public static KeyPair generateRSAKeyPair() | ||
| throws NoSuchAlgorithmException { | ||
| KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA"); | ||
| gen.initialize(2048); | ||
|
|
||
| KeyPair pair = gen.generateKeyPair(); | ||
|
|
||
| return pair; | ||
| } | ||
|
|
||
| /** Get the private key from the RSA key pair. | ||
| * | ||
| *@param kp The RSA KeyPair. | ||
| *@return the RSA private key. | ||
| */ | ||
| public static RSAPrivateKey getRSAPrivate(KeyPair kp) { | ||
| return (RSAPrivateKey)kp.getPrivate(); | ||
| } | ||
|
|
||
| /** Get the public key from the RSA key pair. | ||
| * | ||
| *@param kp The RSA KeyPair. | ||
| *@return the RSA public key. | ||
| */ | ||
| public static RSAPublicKey getRSAPublic(KeyPair kp) { | ||
| return (RSAPublicKey)kp.getPublic(); | ||
| } | ||
|
|
||
| } |
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