Key Management Service:Importar material de clave para una clave asimétrica

Paso 1: Crear una clave asimétrica con un origen de material de clave externo

Antes de importar el material de clave, cree una clave asimétrica con un origen de material de clave externo.

Genere y cifre el material de clave en su entorno de sistema. A continuación se muestran las claves que intervienen en el proceso. Consulte la tabla siguiente para obtener más detalles.

Instalación del SDK

Agregue la dependencia de Maven a su proyecto para descargar automáticamente el paquete de instalación de Java desde el repositorio de Maven. Utilice Alibaba Cloud SDK V2.0.

 <dependency>
 <groupId>com.aliyun</groupId>
 <artifactId>kms20160120</artifactId>
 <version>1.4.0</version>
 </dependency>
 <dependency>
 <groupId>com.aliyun</groupId>
 <artifactId>tea</artifactId>
 <version>1.3.2</version>
 </dependency>

package com.aliyun;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.interfaces.ECPrivateKey;
import java.security.spec.ECGenParameterSpec;
import java.security.spec.MGF1ParameterSpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.spec.OAEPParameterSpec;
import javax.crypto.spec.PSource.PSpecified;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

import com.aliyun.kms20160120.models.*;
import com.aliyun.kms20160120.Client;
import org.bouncycastle.asn1.gm.GMNamedCurves;
import org.bouncycastle.asn1.x9.X9ECParameters;
import org.bouncycastle.crypto.engines.SM2Engine;
import org.bouncycastle.crypto.params.ECDomainParameters;
import org.bouncycastle.crypto.params.ECPublicKeyParameters;
import org.bouncycastle.crypto.params.ParametersWithRandom;
import org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPublicKey;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

public class BringYourOwnAsymmetricKeySample {
    private final static String dedicatedKmsInstanceId = "<yourKmsInstanceId>";
    // The public endpoint of KMS.
    private final static String endpoint = "kms.<regionId>.aliyuncs.com";
    private final Client kmsClient;
    private final String SM2PKE_SM4_ECB = "SM2PKE_SM4_ECB";
    private final String RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD = "RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD";
    private static Provider BC = new BouncyCastleProvider();
    private static X9ECParameters x9ECParameters = GMNamedCurves.getByName("sm2p256v1");
    private static ECDomainParameters ecDomainParameters = new ECDomainParameters(x9ECParameters.getCurve(), x9ECParameters.getG(), x9ECParameters.getN());

    static {
        java.security.Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    }

    public static void main(String[] args) throws Exception {
        // Initialize the KMS SDK.
        Client client = BringYourOwnAsymmetricKeySample.createClient();
        BringYourOwnAsymmetricKeySample sample = new BringYourOwnAsymmetricKeySample(client);

        // Create and import an external key of the EC_SM2 type.
        sample.doByok("EC_SM2", "EC_SM2", sample.SM2PKE_SM4_ECB, "SM4");
        // Create and import an external key of the EC_P256 type.
        sample.doByok("EC_P256", "RSA_2048", sample.RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD, "AES_256");
        // Create and import an external key of the RSA type.
        sample.doByok("RSA_2048", "RSA_2048", sample.RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD, "AES_256");
    }

    /**
     * <b>description</b> :
     * <p>Initialize the client using credentials.</p>
     *
     * @return Client
     * @throws Exception
     */
    public static Client createClient() throws Exception {
        // We recommend that you use the more secure credential-based initialization without hardcoding AccessKey pairs. For more information, see: https://www.alibabacloud.com/help/document_detail/378657.html.
        com.aliyun.credentials.Client credential = new com.aliyun.credentials.Client();
        com.aliyun.teaopenapi.models.Config config = new com.aliyun.teaopenapi.models.Config()
                .setCredential(credential);
        // For the endpoint, see https://api.alibabacloud.com/product/Kms.
        config.endpoint = endpoint;
        return new Client(config);
    }

    public BringYourOwnAsymmetricKeySample(Client kmsClient) {
        this.kmsClient = kmsClient;
    }

    public void doByok(String targetKeySpec, String wrappingKeySpec, String wrappingAlgorithm, String ephemeralKeySpec) {
        try {
            // Create an external ECC key.
            CreateKeyResponseBody.CreateKeyResponseBodyKeyMetadata keyMetadata = this.createExternalKeyInDkms(dedicatedKmsInstanceId, targetKeySpec, "SIGN/VERIFY");
            String keyId = keyMetadata.getKeyId();
            // Obtain the parameters for importing key material.
            GetParametersForImportResponse parametersForImportResponse = this.getParametersForImport(keyId, wrappingKeySpec,
                    wrappingAlgorithm);
            String importToken = parametersForImportResponse.body.getImportToken();
            String publicKeyBase64 = parametersForImportResponse.body.getPublicKey();
            // Generate the ephemeral symmetric key.
            byte[] ephemeralSymmetricKeyPlaintext = this.generateEphemeralSymmetricKey(ephemeralKeySpec);
            // Generate the target asymmetric key.
            byte[] targetAsymmetricKeyPlaintext = this.generateTargetAsymmetricKey(targetKeySpec);
            // Use the import wrapping key public key to encrypt the ephemeral symmetric key.
            byte[] ephemeralSymmetricKeyCipher = this.encryptEphemeralSymmetricKey(publicKeyBase64,
                    wrappingAlgorithm, ephemeralSymmetricKeyPlaintext);
            // Use the ephemeral symmetric key to encrypt the target asymmetric key.
            byte[] targetAsymmetricKeyCipher = this.encryptTargetAsymmetricKey(ephemeralSymmetricKeyPlaintext, targetAsymmetricKeyPlaintext,
                    wrappingAlgorithm);
            // Generate the key material.
            byte[] encryptedKeyMaterial = new byte[ephemeralSymmetricKeyCipher.length + targetAsymmetricKeyCipher.length];
            System.arraycopy(ephemeralSymmetricKeyCipher, 0, encryptedKeyMaterial, 0, ephemeralSymmetricKeyCipher.length);
            System.arraycopy(targetAsymmetricKeyCipher, 0, encryptedKeyMaterial, ephemeralSymmetricKeyCipher.length, targetAsymmetricKeyCipher.length);
            String encryptedKeyMaterialBase64 = DatatypeConverter.printBase64Binary(encryptedKeyMaterial);
            // Import the key material to KMS.
            this.importKeyMaterial(keyId, encryptedKeyMaterialBase64, importToken, 0L);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private GetParametersForImportResponse getParametersForImport(String keyId, String keySpec, String algorithm) throws Exception {
        GetParametersForImportRequest request = new GetParametersForImportRequest();
        request.setKeyId(keyId);
        request.setWrappingKeySpec(keySpec);
        request.setWrappingAlgorithm(algorithm);
        return this.kmsClient.getParametersForImport(request);
    }

    private CreateKeyResponseBody.CreateKeyResponseBodyKeyMetadata createExternalKeyInDkms(String dedicatedKmsInstance, String keySpec, String keyUsage) throws Exception {
        CreateKeyRequest request = new CreateKeyRequest();
        // Create an external key.
        request.setOrigin("EXTERNAL");
        request.setDKMSInstanceId(dedicatedKmsInstance);
        request.setKeySpec(keySpec);
        request.setKeyUsage(keyUsage);
        return kmsClient.createKey(request).body.keyMetadata;
    }

    private byte[] generateEphemeralSymmetricKey(String ephemeralSymmetricKeySpec) throws Exception {
        // If the ephemeral symmetric key is AES_256, the length is 32 bytes.
        int ephemeralSymmetricKeyLength = 32;
        if ("SM4".equals(ephemeralSymmetricKeySpec)) {
            ephemeralSymmetricKeyLength = 16;
        }
        byte[] key = new byte[ephemeralSymmetricKeyLength];
        new Random().nextBytes(key);
        return key;
    }

    private byte[] generateTargetAsymmetricKey(String keySpec) throws Exception {
        PrivateKey privateKey = null;
        // Generate an SM2 key and obtain the D value of the private key.
        if ("EC_SM2".equals(keySpec)) {
            ECPrivateKey ecPrivateKey = (ECPrivateKey) generateSm2KeyPair().getPrivate();
            byte[] dT = ecPrivateKey.getS().toByteArray();
            byte[] d = new byte[32];
            if (dT.length == 33) {
                System.arraycopy(dT, 1, d, 0, 32);
            }
            return dT.length == 32 ? dT : d;
        }

        // Generate an RSA or ECC private key.
        if (keySpec.contains("RSA")) {
            String[] keySpecAttrs = keySpec.split("_");
            int bits = Integer.parseInt(keySpecAttrs[keySpecAttrs.length - 1]);
            privateKey = generateRsaKeyPair(bits).getPrivate();
        } else if (keySpec.contains("EC")) {
            if (keySpec.contains("P256K")) {
                // Generate an EC_P256K private key.
                privateKey = generateEccKeyPair("secp256k1").getPrivate();
            } else {
                // Generate an EC_P256 private key.
                privateKey = generateEccKeyPair("secp256r1").getPrivate();
            }
        }
        if (privateKey != null) {
            // Return the private key in PKCS#8 format.
            return privateKey.getEncoded();
        }
        return null;
    }

    private KeyPair generateEccKeyPair(String keySpec)
            throws NoSuchAlgorithmException, InvalidAlgorithmParameterException {
        ECGenParameterSpec ecSpec = new ECGenParameterSpec(keySpec);
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
        keyPairGenerator.initialize(ecSpec, new SecureRandom());
        return keyPairGenerator.generateKeyPair();
    }

    private KeyPair generateRsaKeyPair(int length) throws Exception {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
        keyGen.initialize(length);
        return keyGen.genKeyPair();
    }

    private KeyPair generateSm2KeyPair() throws Exception {
        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC", "BC");
        keyGen.initialize(new ECGenParameterSpec("sm2p256v1"), new SecureRandom());
        return keyGen.genKeyPair();
    }

    private byte[] encryptEphemeralSymmetricKey(String publicKeyBase64, String wrappingAlgorithm, byte[] ephemeralSymmetricKeyPlaintext) throws Exception {
        PublicKey publickey = null;
        byte[] enchbk = null;
        if ("RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD".equals(wrappingAlgorithm)) {
            publickey = parseDerPublicKey("RSA", publicKeyBase64);
            Cipher oaepFromAlgo = Cipher.getInstance("RSA/ECB/OAEPWithSHA-1AndMGF1Padding");
            OAEPParameterSpec oaepParams = new OAEPParameterSpec("SHA-256", "MGF1", new MGF1ParameterSpec("SHA-256"), PSpecified.DEFAULT);
            oaepFromAlgo.init(Cipher.ENCRYPT_MODE, publickey, oaepParams);
            enchbk = oaepFromAlgo.doFinal(ephemeralSymmetricKeyPlaintext);
        } else if ("SM2PKE_SM4_ECB".equals(wrappingAlgorithm)) {
            publickey = parseDerPublicKey("EC", publicKeyBase64, BC);
            BCECPublicKey localECPublicKey = (BCECPublicKey) publickey;
            ECPublicKeyParameters ecPublicKeyParameters = new ECPublicKeyParameters(localECPublicKey.getQ(), ecDomainParameters);
            SM2Engine sm2Engine = new SM2Engine(SM2Engine.Mode.C1C3C2);
            sm2Engine.init(true, new ParametersWithRandom(ecPublicKeyParameters));
            enchbk = sm2Engine.processBlock(ephemeralSymmetricKeyPlaintext, 0, ephemeralSymmetricKeyPlaintext.length);

        } else {
            throw new Exception("Invalid wrappingAlgorithm");
        }
        return enchbk;
    }

    private PublicKey parseDerPublicKey(String keyType, String pemKey) throws Exception {
        byte[] derKey = DatatypeConverter.parseBase64Binary(pemKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(derKey);
        return KeyFactory.getInstance(keyType).generatePublic(keySpec);
    }

    private PublicKey parseDerPublicKey(String keyType, String pemKey, Provider provider) throws Exception {
        byte[] derKey = DatatypeConverter.parseBase64Binary(pemKey);
        X509EncodedKeySpec keySpec = new X509EncodedKeySpec(derKey);
        return KeyFactory.getInstance(keyType, provider).generatePublic(keySpec);
    }

    private byte[] encryptTargetAsymmetricKey(byte[] secretKey, byte[] targetAsymmetricKeyPlaintext, String wrappingAlgorithm)
            throws Exception {
        if ("RSAES_OAEP_SHA_256_AES_256_ECB_PKCS7_PAD".equals(wrappingAlgorithm)) {
            SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            return cipher.doFinal(targetAsymmetricKeyPlaintext);
        } else if ("SM2PKE_SM4_ECB".equals(wrappingAlgorithm)) {
            SecretKeySpec secretKeySpec = new SecretKeySpec(secretKey, "SM4");
            Cipher cipher = Cipher.getInstance("SM4/ECB/NoPadding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
            return cipher.doFinal(targetAsymmetricKeyPlaintext);
        }

        throw new Exception("Invalid WrappingAlgorithm");
    }

    private void importKeyMaterial(
            String keyId,
            String material,
            String token,
            Long expire
    ) throws Exception {
        ImportKeyMaterialRequest req = newImportKeyMaterialRequest(
                keyId, material, token, expire);
        this.kmsClient.importKeyMaterial(req);
    }

    private ImportKeyMaterialRequest newImportKeyMaterialRequest(
            String keyId,
            String material,
            String token,
            Long expire
    ) {
        ImportKeyMaterialRequest request = new ImportKeyMaterialRequest();
        request.setEncryptedKeyMaterial(material);
        request.setImportToken(token);
        request.setKeyId(keyId);
        request.setKeyMaterialExpireUnix(expire);
        return request;
    }
}