将字符串转换为私钥和公钥 (RSA)答案

【问题标题】：convert string to private and public key (RSA)将字符串转换为私钥和公钥 (RSA)
【发布时间】：2017-09-08 09:11:13
【问题描述】：

作为私钥和公钥的两个字符串是：

    static String Public =          
       "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDH+wPrKYG1KVlzQUVtBghR8n9d" + "/n" +
     "zcShSZo0+3KgyVdOea7Ei7vQ1U4wRn1zlI5rSqHDzFitblmqnB2anzVvdQxLQ3Uq" + "/n" +
    "EBKBfMihnLgCSW8Xf7MCH+DSGHNvBg2xSNhcfEmnbLPLnbuz4ySn1UB0lH2eqxy5" + "/n"+
     "0zstxhTY0binD9Y+rwIDAQAB"+ "/n";
    static String Private = 
        "MIICxjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQIr5NQ/LYPG/UCAggA" +"/n"+
      "MBQGCCqGSIb3DQMHBAiLh89iGSkmoASCAoBCpAo9/IzDE3yGhvWr9RgozE7revOo" +"/n"+
          "V2OXmU+d0+WYAAx2GYVaUCbFVrmgiVmrbiTgLUMXAGIpvxQ2rzyIvRHW/RN3Gcky" +"/n"+
        "qR/AwBatzixqrnoS4aD1/Ovjr4hwde4XHYbPEilZZuVAJFiznhy73qm/So4XghSY........." ;

我已经阅读了其他问题并尝试了他们的解决方案，但没有任何效果....我有一个公钥和私钥都是字符串。我需要将它们转换为“密钥”，但我不断收到 java.security.spec .InvalidKeySpecException: java.security.InvalidKeyException ..at generatePublic 和 generatePrivate 函数.. 密钥也只是用于测试因此，如果其他人知道它们就可以了...

      public static Key loadPublicKey(String stored) throws GeneralSecurityException, IOException 
       {
      byte[] data = Base64.getDecoder().decode((stored.getBytes()));
      X509EncodedKeySpec spec = new X509EncodedKeySpec(data);
      KeyFactory fact = KeyFactory.getInstance("RSA");
      return fact.generatePublic(spec);

        }


public static Key loadPrivateKey(String key64) throws     GeneralSecurityException, IOException {
        byte[] clear = Base64.getDecoder().decode(key64.getBytes());
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(clear);
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PrivateKey priv = fact.generatePrivate(keySpec);
        Arrays.fill(clear, (byte) 0);
        return priv;

   }

【问题讨论】：

去掉换行符+ "/n"
仍是同样的问题..我得到java.security.spec.InvalidKeySpecException：java.security.InvalidKeyException：我改变了公共密钥： “MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDH + wPrKYG1KVlzQUVtBghR8n9dzcShSZo0 + 3KgyVdOea7Ei7vQ1U4wRn1zlI5rSqHDzFitblmqnB2anzVvdQxLQ3UqEBKBfMihnLgCSW8Xf7MCH + DSGHNvBg2xSNhcfEmnbLPLnbuz4ySn1UB0lH2eqxy50zstxhTY0binD9Y + rwIDAQAB”跨度>
我自己用公钥试了一下，效果很好
换行符是\n，而不是/n。在字符串中，这看起来像 "\\n"。
Necroed but for info：除了无关的/n，您的Public 确实是适用于Java X509EncodedKeySpec 的X.509-SPKI 公钥的base64，但您的Private是（base64 开头的）加密 PKCS8 私钥 (EncryptedPrivateKeyInfo) 而PKCS8EncodedKeySpec 必须未加密 或此处解密 .如果您有密码并且（可以）使用 BouncyCastle，请参阅stackoverflow.com/questions/49932334/…，否则会相当复杂。

标签： java encryption rsa encode

【解决方案1】：

//Function is in scala and need input parameter as string to be decrypted

def RsaDecryption(inParm: String): String = {
      val decoded_string = inParm.getBytes()
      val strBytes = getDecoder.decode(decoded_string)
      //println("String in Bytes "+strBytes)
      val DecryptKey  = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAl3XbajBtSXXJ45h4OYxN6Acqry6+032MmMvB7R4vZ5t/sIEo7IAblOY/JGrHpikVWvmSw+vVyYlQ6W8EVi60/QvZXdqBf+Sbmu6JusuKX8ObkpDr4DXcJCvW1k6TGzuYN9X2WTIknRL8z/OabFAf79ybBFwDWq/vhoagMMDz03FCt0sydo83m878WW4pqVYzRW0OHug3dHhePuL21+oOIFK5+H3FMLT1mPV9FDVu33RtopsoKkkPJ8/MtowgRi+Uk8WHXEcf+NGQh3wee8Tz8LT2UuiCeq997PjfP8LipRyZ9wS0FsZb33Wgbcgns6MTBQPfsPz1b97x46IN7zsJeQIDAQAB"
      val DecBytes = Base64.getDecoder().decode(DecryptKey)
      val DecSpec = new X509EncodedKeySpec(DecBytes)
      val keyFactory = KeyFactory.getInstance("RSA")
      val DecKey = keyFactory.generatePublic(DecSpec)
      val decryptionCipher2 = Cipher.getInstance("RSA")
      decryptionCipher2.init(Cipher.DECRYPT_MODE, DecKey)
      val decryptedMessage = decryptionCipher2.doFinal(strBytes)
      val decmsg = new String(decryptedMessage)
      //println(DecKey)
      //println("Public key string "+getEncoder.encodeToString(DecKey.getEncoded()))
      return decmsg
    }

【讨论】：

【解决方案2】：

删除字符串声明中的换行符。这不是关键的一部分：

static String Public =          
       "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDH+wPrKYG1KVlzQUVtBghR8n9d" +
     "zcShSZo0+3KgyVdOea7Ei7vQ1U4wRn1zlI5rSqHDzFitblmqnB2anzVvdQxLQ3Uq" + 
    "EBKBfMihnLgCSW8Xf7MCH+DSGHNvBg2xSNhcfEmnbLPLnbuz4ySn1UB0lH2eqxy5" +
     "0zstxhTY0binD9Y+rwIDAQAB";
static String Private = 
        "MIICxjBABgkqhkiG9w0BBQ0wMzAbBgkqhkiG9w0BBQwwDgQIr5NQ/LYPG/UCAggA" +
      "MBQGCCqGSIb3DQMHBAiLh89iGSkmoASCAoBCpAo9/IzDE3yGhvWr9RgozE7revOo" +
          "V2OXmU+d0+WYAAx2GYVaUCbFVrmgiVmrbiTgLUMXAGIpvxQ2rzyIvRHW/RN3Gcky" +
        "qR/AwBatzixqrnoS4aD1/Ovjr4hwde4XHYbPEilZZuVAJFiznhy73qm/So4XghSY........." ;

我已经用下面的代码试过了：

  public static void main(String[] args) throws GeneralSecurityException, IOException {
      System.out.println(loadPublicKey(Public));

  }

  public static Key loadPublicKey(String stored) throws GeneralSecurityException, IOException 
  {
 byte[] data = Base64.getDecoder().decode((stored.getBytes()));
 X509EncodedKeySpec spec = new X509EncodedKeySpec(data);
 KeyFactory fact = KeyFactory.getInstance("RSA");
 return fact.generatePublic(spec);

   }

输出是：

Sun RSA public key, 1024 bits
  modulus: 140431102839105138202102866401190456107365606715815288536913018579006717438700259314092212104831553250527764925385527697411165705192297577022746989837839401358787285684108054389360182109284048524426941021357601686464156659759470495649944686235380003772357268264646549523784880655065600797504478771675703688879
  public exponent: 65537

【讨论】：

@zaph 它是一个多行字符串.. 不能按原样写... 除非全部放在一行中
@HayaRaed 不可能。我自己用公钥试过了，没有例外
@Jens 真的！！为什么我得到......线程“主”中的异常 java.security.spec.InvalidKeySpecException：java.security.InvalidKeyException：IOException：DER 输入，sun.security.rsa.RSAKeyFactory.engineGeneratePrivate 处的整数标记错误（未知来源）在 java.security.KeyFactory.generatePrivate(Unknown Source) 在 Main.loadPrivateKey(Main.java:144) 在 Main.main(Main.java:185) 原因：java.security.InvalidKeyException：IOException：DER 输入，整数标记sun.security.pkcs.PKCS8Key.decode 的错误（未知来源）
@HayaRaed 您参考了私钥部分。我不能检查它，因为你没有完整地显示它
看起来它是 DER 而不是 RSA 密钥？