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/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for
* license information.
*/
package com.microsoft.azure.keyvault.cryptography;
import java.io.IOException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import java.security.interfaces.RSAPublicKey;
import java.util.UUID;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.lang3.tuple.Triple;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.microsoft.azure.keyvault.core.IKey;
import com.microsoft.azure.keyvault.cryptography.algorithms.Rs256;
import com.microsoft.azure.keyvault.cryptography.algorithms.RsaOaep;
import com.microsoft.azure.keyvault.cryptography.algorithms.RsaSignature;
import com.microsoft.azure.keyvault.webkey.JsonWebKey;
public class RsaKey implements IKey {
public static int KeySize1024 = 1024;
public static int KeySize2048 = 2048;
public static int KeySize4096 = 4096;
public static int getDefaultKeySize() {
return RsaKey.KeySize2048;
}
private final String _kid;
private final KeyPair _keyPair;
private final Provider _provider;
/**
* Constructor.
*
* Generates a new RsaKey with a 2048 size keypair and a randomly generated kid.
* @throws NoSuchAlgorithmException
*/
public RsaKey() throws NoSuchAlgorithmException {
this(UUID.randomUUID().toString());
}
/**
* Constructor.
*
* Generates a new RsaKey with a 2048 size keypair and the kid given.
* @param kid
* @throws NoSuchAlgorithmException
*/
public RsaKey(String kid) throws NoSuchAlgorithmException {
this(kid, getDefaultKeySize());
}
/**
* Constructor.
*
* Generates a new RsaKey with size keySize and the kid given.
* @param kid
* @param keySize
* @throws NoSuchAlgorithmException
*/
public RsaKey(String kid, int keySize) throws NoSuchAlgorithmException {
this(kid, keySize, null);
}
/**
* Constructor.
*
* Generates a new RsaKey with size keySize and the kid given. The given provider is used for algorithm implementation.
* @param kid
* @param keySize
* @param provider Java security provider.
* @throws NoSuchAlgorithmException
*/
public RsaKey(String kid, int keySize, Provider provider) throws NoSuchAlgorithmException {
if (Strings.isNullOrWhiteSpace(kid)) {
throw new IllegalArgumentException("kid");
}
final KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", provider);
generator.initialize(keySize);
_kid = kid;
_keyPair = generator.generateKeyPair();
_provider = provider;
}
/**
* Constructor.
*
* Generates a new RsaKey with the given KeyPair.
* The keyPair must be an RSAKey.
* @param kid
* @param keyPair
*/
public RsaKey(String kid, KeyPair keyPair) {
this(kid, keyPair, null);
}
/**
* Constructor.
*
* Generates a new RsaKey with given KeyPair. The given provider is used for algorithm implementation.
* The keyPair must be an RSAKey.
* @param kid
* @param keyPair
* @param provider Java security provider
*/
public RsaKey(String kid, KeyPair keyPair, Provider provider) {
if (Strings.isNullOrWhiteSpace(kid)) {
throw new IllegalArgumentException("Please provide a kid");
}
if (keyPair == null) {
throw new IllegalArgumentException("Please provide a KeyPair");
}
if (keyPair.getPublic() == null || !(keyPair.getPublic() instanceof RSAPublicKey)) {
throw new IllegalArgumentException("The KeyPair is not an RsaKey");
}
_kid = kid;
_keyPair = keyPair;
_provider = provider;
}
/**
* Converts JSON web key to RsaKey.
* @param jwk
* @return RsaKey
*/
public static RsaKey fromJsonWebKey(JsonWebKey jwk) {
return fromJsonWebKey(jwk, false, null);
}
/**
* Converts JSON web key to RsaKey and include the private key if set to true.
* @param jwk
* @param includePrivateParameters true if the RSA key pair should include the private key. False otherwise.
* @return RsaKey
*/
public static RsaKey fromJsonWebKey(JsonWebKey jwk, boolean includePrivateParameters) {
return fromJsonWebKey(jwk, includePrivateParameters, null);
}
/**
* Converts JSON web key to RsaKey and include the private key if set to true.
* @param provider the Java security provider.
* @param includePrivateParameters true if the RSA key pair should include the private key. False otherwise.
* @return RsaKey
*/
public static RsaKey fromJsonWebKey(JsonWebKey jwk, boolean includePrivateParameters, Provider provider) {
if (jwk.kid() != null) {
return new RsaKey(jwk.kid(), jwk.toRSA(includePrivateParameters, provider));
} else {
throw new IllegalArgumentException("Json Web Key must have a kid");
}
}
/**
* Converts RsaKey to JSON web key.
* @return
*/
public JsonWebKey toJsonWebKey() {
return JsonWebKey.fromRSA(_keyPair);
}
@Override
public String getDefaultEncryptionAlgorithm() {
return RsaOaep.ALGORITHM_NAME;
}
@Override
public String getDefaultKeyWrapAlgorithm() {
return RsaOaep.ALGORITHM_NAME;
}
@Override
public String getDefaultSignatureAlgorithm() {
return Rs256.ALGORITHM_NAME;
}
@Override
public String getKid() {
return _kid;
}
public KeyPair getKeyPair() {
return _keyPair;
}
@Override
public ListenableFuture<byte[]> decryptAsync(final byte[] ciphertext, final byte[] iv, final byte[] authenticationData, final byte[] authenticationTag, final String algorithm) throws NoSuchAlgorithmException {
if (ciphertext == null) {
throw new IllegalArgumentException("ciphertext");
}
// Interpret the requested algorithm
if (Strings.isNullOrWhiteSpace(algorithm)) {
throw new IllegalArgumentException("algorithm");
}
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithm);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricEncryptionAlgorithm)) {
throw new NoSuchAlgorithmException(algorithm);
}
AsymmetricEncryptionAlgorithm algo = (AsymmetricEncryptionAlgorithm)baseAlgorithm;
ICryptoTransform transform;
ListenableFuture<byte[]> result;
try {
transform = algo.CreateDecryptor(_keyPair, _provider);
result = Futures.immediateFuture(transform.doFinal(ciphertext));
} catch (Exception e) {
result = Futures.immediateFailedFuture(e);
}
return result;
}
@Override
public ListenableFuture<Triple<byte[], byte[], String>> encryptAsync(final byte[] plaintext, final byte[] iv, final byte[] authenticationData, final String algorithm) throws NoSuchAlgorithmException {
if (plaintext == null) {
throw new IllegalArgumentException("plaintext");
}
// Interpret the requested algorithm
String algorithmName = (Strings.isNullOrWhiteSpace(algorithm) ? getDefaultEncryptionAlgorithm() : algorithm);
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithmName);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricEncryptionAlgorithm)) {
throw new NoSuchAlgorithmException(algorithmName);
}
AsymmetricEncryptionAlgorithm algo = (AsymmetricEncryptionAlgorithm)baseAlgorithm;
ICryptoTransform transform;
ListenableFuture<Triple<byte[], byte[], String>> result;
try {
transform = algo.CreateEncryptor(_keyPair, _provider);
result = Futures.immediateFuture(Triple.of(transform.doFinal(plaintext), (byte[]) null, algorithmName));
} catch (Exception e) {
result = Futures.immediateFailedFuture(e);
}
return result;
}
@Override
public ListenableFuture<Pair<byte[], String>> wrapKeyAsync(final byte[] key, final String algorithm) throws NoSuchAlgorithmException {
if (key == null) {
throw new IllegalArgumentException("key");
}
// Interpret the requested algorithm
String algorithmName = (Strings.isNullOrWhiteSpace(algorithm) ? getDefaultKeyWrapAlgorithm() : algorithm);
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithmName);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricEncryptionAlgorithm)) {
throw new NoSuchAlgorithmException(algorithmName);
}
AsymmetricEncryptionAlgorithm algo = (AsymmetricEncryptionAlgorithm)baseAlgorithm;
ICryptoTransform transform;
ListenableFuture<Pair<byte[], String>> result;
try {
transform = algo.CreateEncryptor(_keyPair, _provider);
result = Futures.immediateFuture(Pair.of(transform.doFinal(key), algorithmName));
} catch (Exception e) {
result = Futures.immediateFailedFuture(e);
}
return result;
}
@Override
public ListenableFuture<byte[]> unwrapKeyAsync(final byte[] encryptedKey, final String algorithm) throws NoSuchAlgorithmException {
if (encryptedKey == null) {
throw new IllegalArgumentException("encryptedKey ");
}
// Interpret the requested algorithm
if (Strings.isNullOrWhiteSpace(algorithm)) {
throw new IllegalArgumentException("algorithm");
}
// Interpret the requested algorithm
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithm);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricEncryptionAlgorithm)) {
throw new NoSuchAlgorithmException(algorithm);
}
AsymmetricEncryptionAlgorithm algo = (AsymmetricEncryptionAlgorithm)baseAlgorithm;
ICryptoTransform transform;
ListenableFuture<byte[]> result;
try {
transform = algo.CreateDecryptor(_keyPair, _provider);
result = Futures.immediateFuture(transform.doFinal(encryptedKey));
} catch (Exception e) {
result = Futures.immediateFailedFuture(e);
}
return result;
}
@Override
public ListenableFuture<Pair<byte[], String>> signAsync(final byte[] digest, final String algorithm) throws NoSuchAlgorithmException {
if (digest == null) {
throw new IllegalArgumentException("encryptedKey ");
}
// Interpret the requested algorithm
if (Strings.isNullOrWhiteSpace(algorithm)) {
throw new IllegalArgumentException("algorithm");
}
// Interpret the requested algorithm
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithm);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricSignatureAlgorithm)) {
throw new NoSuchAlgorithmException(algorithm);
}
RsaSignature algo = (RsaSignature) baseAlgorithm;
ISignatureTransform signer = algo.createSignatureTransform(_keyPair);
try {
return Futures.immediateFuture(Pair.of(signer.sign(digest), algorithm));
} catch (Exception e) {
return Futures.immediateFailedFuture(e);
}
}
@Override
public ListenableFuture<Boolean> verifyAsync(final byte[] digest, final byte[] signature, final String algorithm) throws NoSuchAlgorithmException {
if (digest == null) {
throw new IllegalArgumentException("encryptedKey ");
}
// Interpret the requested algorithm
if (Strings.isNullOrWhiteSpace(algorithm)) {
throw new IllegalArgumentException("algorithm");
}
// Interpret the requested algorithm
Algorithm baseAlgorithm = AlgorithmResolver.Default.get(algorithm);
if (baseAlgorithm == null || !(baseAlgorithm instanceof AsymmetricSignatureAlgorithm)) {
throw new NoSuchAlgorithmException(algorithm);
}
RsaSignature algo = (RsaSignature) baseAlgorithm;
ISignatureTransform signer = algo.createSignatureTransform(_keyPair);
try {
return Futures.immediateFuture(signer.verify(digest, signature));
} catch (Exception e) {
return Futures.immediateFailedFuture(e);
}
}
@Override
public void close() throws IOException {
// Intentionally empty
}
}