无法解密在WebCrypto API中加密的Java中的数据

Question

我正在Java中生成密钥对，并在WebCrypto API通过使用公共密钥。我得到的加密数据是以uint8array格式，试图用我的爪哇的私钥解密独自一人。

Java代码：

import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
public class RSAOAEP {
  public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    byte[] input = "{"userid":"raj1242","appid":"1234","tenentid":"4567","sessionid":"session1234567"}".getBytes();
    Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding", "BC");
    SecureRandom random = new SecureRandom();
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");
    generator.initialize(4096, random);
    KeyPair pair = generator.generateKeyPair();
    Key pubKey = pair.getPublic();
    Key privKey = pair.getPrivate();
    System.out.println("privateKey: "+privKey);
    System.out.println("publicKey: "+pubKey);
    //Need to assign value from webcrpto api encrypted data
    byte[] cipherText= {};
    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] plainText = cipher.doFinal(cipherText);
    System.out.println("plain : " + new String(plainText));
  }
}

WebCrypto API代码加密数据：

window.crypto.subtle.encrypt(
    {
        name: "RSA-OAEP",
        //label: Uint8Array([...]) //optional
    },
    publicKey, //from java generateKey 
    data //ArrayBuffer of data you want to encrypt
)
.then(function(encrypted){
    //returns an ArrayBuffer containing the encrypted data
    console.log(new Uint8Array(encrypted));
})
.catch(function(err){
    console.error(err);
});

Answer 1

签署了所有Java原语。要将UINT8转换为字节，您可以执行以下操作。尽管这些值似乎并不平等，但是芯片算法在位表示方面起作用。
在签名版本和未签名版本上，0到127的值均相等。

            Signed byte value   Unsigned byte value
0000 0001  =  1                 1
...
0111 1111  =  127               127

在128个值之后发生了变化

              Signed byte value  Unsigned byte value
1000 0000   = -128                128
1000 0001   = -127                129
1000 0011   = -125                131
.....
1111 1111   = -1                  255

因此，我们可以编写代码以将无符号值位表示为签名字节。

    // You should read uint8 value to short and then do the conversion
    public byte covertToSignedByte (short unit8Value){
        byte byteValue ;
        if(unit8Value <= 127){
           byteValue = (byte) unit8Value; // it is same up to 127
        }
        else {
           byteValue = (byte)(unit8Value- 256); // after 128 we can substract 256 to get the signed bit representation
        }
        return byteValue;
    }