非对称加密算法：ECIESwithAES

 参考椭圆曲线加密：elliptic curve cryptography (ECC)， 这里的椭圆曲线:elliptic curve（EC）。

 

使用公钥加密，再使用私钥解密。不像RSA，既可以使用公钥加密，再使用私钥解密，也可以私钥加密，再使用公钥解密

 

private static Provider provider = null;

private static BCECPrivateKey privateKey = null;
private static byte[] privateKeyEncoded1 = null;

private static BCECPublicKey publicKey = null;
private static byte[] publicKeyEncoded1 = null;

 

@BeforeClass
public static void init() /* throws NoSuchAlgorithmException */ {
    init0();
}

 

public static void init0() /* throws NoSuchAlgorithmException */ {
    provider = new BouncyCastleProvider();
//        provider = new BouncyCastlePQCProvider();

    KeyPairGenerator keyPairGenerator = null;
    try {
        keyPairGenerator = KeyPairGenerator.getInstance("EC", provider); // sun.security.rsa.RSAKeyPairGenerator
    } catch (NoSuchAlgorithmException e) {
        Assert.fail("no such algorithm: " + e.getMessage());
    }

    keyPairGenerator.initialize(256, new SecureRandom());

    KeyPair keyPair1 = keyPairGenerator.generateKeyPair();
    privateKey = (BCECPrivateKey) keyPair1.getPrivate();
    publicKey = (BCECPublicKey) keyPair1.getPublic();

    privateKeyEncoded1 = privateKey.getEncoded();
    publicKeyEncoded1 = publicKey.getEncoded();

    System.out.println("private key: " + Base64.byteArrayToBase64(privateKeyEncoded1));
    System.out.println("public key: " + Base64.byteArrayToBase64(publicKeyEncoded1));
}

 

/**
 * 使用公钥加密，再使用私钥解密
 */
@Test
public void test1() {
    String message = "13120983870";
    System.out.println(message);

    IESCipher.ECIESwithAES cipher1 = new IESCipher.ECIESwithAES();
    try {
        cipher1.engineInit(Cipher.ENCRYPT_MODE, publicKey, new SecureRandom());
    } catch (InvalidKeyException e) {
        Assert.fail("invalid key: " + e.getMessage());
    }

    byte[] encryption1 = null;
    try {
        encryption1 = cipher1.engineDoFinal(message.getBytes(), 0, message.getBytes().length);
    } catch (IllegalBlockSizeException e) {
        Assert.fail("illegal block size: " + e.getMessage());
    } catch (BadPaddingException e) {
        Assert.fail("bad padding: " + e.getMessage());
    }
    System.out.println("encryption: " + Base64.byteArrayToBase64(encryption1));



    cipher1 = new IESCipher.ECIESwithAES();
    try {
        cipher1.engineInit(Cipher.DECRYPT_MODE, privateKey, new SecureRandom());
    } catch (InvalidKeyException e) {
        Assert.fail("invalid key: " + e.getMessage());
    }
    byte[] decryption1 = null;
    try {
        decryption1 = cipher1.engineDoFinal(encryption1, 0, encryption1.length);
    } catch (IllegalBlockSizeException e) {
        Assert.fail("illegal block size: " + e.getMessage());
    } catch (BadPaddingException e) {
        Assert.fail("bad padding: " + e.getMessage());
    }
    System.out.println("decryption: " + new String(decryption1) + ", base64:" + Base64.byteArrayToBase64(decryption1));
}

 

private key: MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQgQ4vAWWNYMncNYX/kkgxPhUullJk4UR5hTEW1krcqD32gCgYIKoZIzj0DAQehRANCAATs04Bcawzubw4ozfPRhkZpykWw6TErFPhIwOYihY/RrbaiaIGJJdvbIpxm3D+YqFcnSSbTH5WXrxpQToXiUPtc
public key: MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE7NOAXGsM7m8OKM3z0YZGacpFsOkxKxT4SMDmIoWP0a22omiBiSXb2yKcZtw/mKhXJ0km0x+Vl68aUE6F4lD7XA==
13120983870
encryption: BK8kO9AQoMYqTK8/BedPndCfVPpxhuvfSxUHM0UDNeWNV6RsaDOI0/XTC/5BGIkbt40JN7/T8wY9NfDZYx/jye5w09aqt90TIzBpBL7MC1jgBieji433pu2ZzhSizVwJ9QCt0zc=
decryption: 13120983870, base64:MTMxMjA5ODM4NzA=

 

private void encryptAndDecrypt(String message, PrivateKey privateKey, PublicKey publicKey) {
    IESCipher.ECIESwithAES cipher1 = new IESCipher.ECIESwithAES();
    try {
        cipher1.engineInit(Cipher.ENCRYPT_MODE, publicKey, new SecureRandom());
    } catch (InvalidKeyException e) {
        Assert.fail("invalid key: " + e.getMessage());
    }

    byte[] encryption1 = null;
    try {
        encryption1 = cipher1.engineDoFinal(message.getBytes(), 0, message.getBytes().length);
    } catch (IllegalBlockSizeException e) {
        Assert.fail("illegal block size: " + e.getMessage());
    } catch (BadPaddingException e) {
        Assert.fail("bad padding: " + e.getMessage());
    }
    System.out.println("encryption: " + Base64.byteArrayToBase64(encryption1));



    cipher1 = new IESCipher.ECIESwithAES();
    try {
        cipher1.engineInit(Cipher.DECRYPT_MODE, privateKey, new SecureRandom());
    } catch (InvalidKeyException e) {
        Assert.fail("invalid key: " + e.getMessage());
    }
    byte[] decryption1 = null;
    try {
        decryption1 = cipher1.engineDoFinal(encryption1, 0, encryption1.length);
    } catch (IllegalBlockSizeException e) {
        Assert.fail("illegal block size: " + e.getMessage());
    } catch (BadPaddingException e) {
        Assert.fail("bad padding: " + e.getMessage());
    }
    System.out.println("decryption: " + new String(decryption1) + ", base64:" + Base64.byteArrayToBase64(decryption1));
}

 

@Test
public void test_1() {
    String privKey = "MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQg9ye6MPlsZbIKD3hwqWebMOkmcKHlk0NEmTbPKQDZxe2gCgYIKoZIzj0DAQehRANCAARZXl/Wn+3uVSyk/VDncYFNazAjPMEBXEwS/iWy0hwidaU3t3OrYXVMsE5xqx7qtgmBu0/dbCdyUmwMVL5CclFq";
    String pubKey = "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEWV5f1p/t7lUspP1Q53GBTWswIzzBAVxMEv4lstIcInWlN7dzq2F1TLBOcase6rYJgbtP3WwnclJsDFS+QnJRag==";

    byte[] privateKeyEncoded = Base64.base64ToByteArray(privKey);
    byte[] publicKeyEncoded = Base64.base64ToByteArray(pubKey);

    String message = "13120983870";
    System.out.println(message);

    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(privateKeyEncoded);
    ECKeyFactorySpi keyFactory = new ECKeyFactorySpi();

    PrivateKey privateKey = null;
    try {
        privateKey = keyFactory.engineGeneratePrivate(pkcs8KeySpec);
    } catch (InvalidKeySpecException e) {
        Assert.fail("invalid key spec: " + e.getMessage());
    }
    System.out.println("private key: " + Base64.byteArrayToBase64(((Key) privateKey).getEncoded()));


    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyEncoded);
    keyFactory = new ECKeyFactorySpi();

    PublicKey publicKey = null;
    try {
        publicKey = keyFactory.engineGeneratePublic(x509KeySpec);
    } catch (InvalidKeySpecException e) {
        Assert.fail("invalid key spec: " + e.getMessage());
    }
    System.out.println("public key: " + Base64.byteArrayToBase64(((Key) publicKey).getEncoded()));

    encryptAndDecrypt(message, privateKey, publicKey);
}

 

13120983870
private key: MIGTAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBHkwdwIBAQQg9ye6MPlsZbIKD3hwqWebMOkmcKHlk0NEmTbPKQDZxe2gCgYIKoZIzj0DAQehRANCAARZXl/Wn+3uVSyk/VDncYFNazAjPMEBXEwS/iWy0hwidaU3t3OrYXVMsE5xqx7qtgmBu0/dbCdyUmwMVL5CclFq
public key: MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEWV5f1p/t7lUspP1Q53GBTWswIzzBAVxMEv4lstIcInWlN7dzq2F1TLBOcase6rYJgbtP3WwnclJsDFS+QnJRag==
encryption: BLcrguLmGY9Hetf7UmtAyTg+8fVmH2Ya/oBjRHzwkbTZpiKbOBR+a44y2PJROBZDFBDZJTExb17HqRe1XFxeDSA5mmb2t1xhwxwd4PgckThbGhLewx151Mww2eyA9gWDMC9Wqrs=
decryption: 13120983870, base64:MTMxMjA5ODM4NzA=

 

 

package org.spongycastle.jcajce.provider.asymmetric.ec;

import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;

import org.spongycastle.jce.provider.BouncyCastleProvider;

public class ECKeyFactorySpi extends org.spongycastle.jcajce.provider.asymmetric.ec.KeyFactorySpi {

    public ECKeyFactorySpi() {
        super("EC", BouncyCastleProvider.CONFIGURATION);
    }

    public PrivateKey engineGeneratePrivate(
            KeySpec keySpec)
            throws InvalidKeySpecException {
        return super.engineGeneratePrivate(keySpec);
    }

    public PublicKey engineGeneratePublic(
            KeySpec keySpec)
            throws InvalidKeySpecException {
        return super.engineGeneratePublic(keySpec);
    }
}