Java 7中的椭圆曲线加密实现

我想在java中实现椭圆曲线加密（ECC），因为java 7提供支持椭圆曲线加密（ECC）的本机提供商SunEC 但是我总是收到错误java.security。 InvalidKeyException：无效的密钥长度：91个字节，因为我创建的椭圆曲线不合适。Java 7中的椭圆曲线加密实现

我使用的Java 7我的任务就是用ECC生成用于加密和解密

package com.acc; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.security.KeyPair; 
import java.security.KeyPairGenerator; 
import java.security.PrivateKey; 
import java.security.Provider; 
import java.security.PublicKey; 
import java.security.SecureRandom; 
import java.security.Security; 
import java.security.Signature; 
import java.security.spec.ECGenParameterSpec; 
import java.security.spec.ECParameterSpec; 
import java.security.spec.EllipticCurve; 

import javax.crypto.Cipher; 
import javax.crypto.CipherInputStream; 
import javax.crypto.CipherOutputStream; 
import javax.crypto.spec.DESKeySpec; 


public class TestECC { 

    public static void main(String args[]) { 
     try { 
      Provider p[] = Security.getProviders(); 
      Provider p1 = Security.getProvider("SunEC"); 
      System.out.println(p1.getName()); 
      KeyPairGenerator kpg = KeyPairGenerator.getInstance("EC", "SunEC"); 
      System.out.println(kpg.getAlgorithm()); 

      Cipher cipher = Cipher.getInstance("DES"); 
      System.out.println("provider=" + cipher.getProvider()); 

      ECGenParameterSpec ecsp = new ECGenParameterSpec("sect163r2"); 

      kpg.initialize(ecsp); 
      KeyPair kyp = kpg.genKeyPair(); 
      PublicKey pubKey = kyp.getPublic(); 

      PrivateKey privKey = kyp.getPrivate(); 
      System.out.println(cipher.getProvider()); 

      cipher.init(Cipher.ENCRYPT_MODE, pubKey); 

      String cleartextFile = "cleartext.txt"; 
      String ciphertextFile = "ciphertextECIES.txt"; 

      byte[] block = new byte[64]; 
      FileInputStream fis = new FileInputStream(cleartextFile); 
      FileOutputStream fos = new FileOutputStream(ciphertextFile); 
      CipherOutputStream cos = new CipherOutputStream(fos, cipher); 

      int i; 
      while ((i = fis.read(block)) != -1) { 
       cos.write(block, 0, i); 
      } 
      cos.close(); 

      // Decrypt 

      String cleartextAgainFile = "cleartextAgainECIES.txt"; 

      cipher.init(Cipher.DECRYPT_MODE, privKey, ecsp); 

      fis = new FileInputStream(ciphertextFile); 
      CipherInputStream cis = new CipherInputStream(fis, cipher); 
      fos = new FileOutputStream(cleartextAgainFile); 

      while ((i = cis.read(block)) != -1) { 
       fos.write(block, 0, i); 
      } 
      fos.close(); 

     } catch (Exception e) { 
      System.out.println(e); 
     } 
    } 

}

输出键： SunEC EC 提供商=了SunJCE版本1.7 了SunJCE 1.7版本 java.security。 InvalidKeyException：无效的密钥长度：91字节

能否请您帮助ECC曲线和算法使用

来源

2011-09-16 Akash

你确定你的Java实现支持SEC 2椭圆曲线域“sect163r2”吗？ – darvids0n

请问您可以帮助ECC曲线和算法使用 – Akash

为什么不使用BouncyCastle库？ – Tair