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当我尝试使用 EC 公钥加密字节数组时出现以下异常：

java.security.InvalidKeyException：没有安装的提供程序支持此密钥：sun.security.ec.ECPublicKeyImpl

当我调用Cipher.init(). 下面的几行显示了我在程序中所做的事情：

ECPublicKey publicKey ;
ECPrivateKey privateKey;

//Generating key paire (public and private keys) 
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("EC", "SunEC");
    SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN");

    keyGen.initialize(571, random);
    KeyPair pair = keyGen.generateKeyPair();
    privateKey = (ECPrivateKey) pair.getPrivate();
    publicKey = (ECPublicKey) pair.getPublic();

// get an AES cipher object with CTR encription mode 
   Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");

// encrypt the sharedSecret using the public key
   cipher.init(Cipher.ENCRYPT_MODE, publicKey);**
   byte[] result = cipher.doFinal(data);

我必须添加一个提供者来支持这个公钥吗？

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3 回答 3

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最后，我找到了这个异常的来源。问题是密码的初始化：

//This is the wrong initialization
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");

//This is the right initialization
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding","SunJCE");

但是现在，我有另一个例外（它不如前一个重要）：

java.security.InvalidKeyException: Invalid AES key length: 170 bytes

那么我现在必须使用什么作为 ECDSA 公钥的加密算法呢？

于 2015-05-13T10:16:36.563 回答
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  KeyGenerator keygen = KeyGenerator.getInstance("AES");
  keygen.init(128);
  key = keygen.generateKey();
String plain_input = "Hush-a-bye, baby, on the tree top,When the wind blows" ; 
  //encryption
  cipher = Cipher.getInstance(""AES/EBC/PKCS5Padding");
  cipher.init(Cipher.ENCRYPT_MODE, key);
  byte[] encrypted = cipher.doFinal(plain_input.getBytes("UTF8"));

  //decryption
  cipher = Cipher.getInstance(""AES/EBC/PKCS5Padding");
  cipher.init(Cipher.DECRYPT_MODE, key);
  byte[] decrypted = cipher.doFinal(encrypted);
  String plain_output = new String(decrypted, "UTF8");
于 2017-01-30T15:33:05.113 回答
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ECDSA 不用于加密，而是使用 RSA / 对称密码

于 2017-01-30T15:28:28.680 回答