我想创建用 java 编写的消息签名和验证软件。
因此，我决定使用互联网上的一些代码。
虽然代码没有语法错误，但它显示 java 堆空间错误。
但是，错误消息如下所示
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.io.ByteArrayOutputStream.write(Unknown Source)
at myPackage.BASE64Decoder.decodeAtom(BASE64Decoder.java:87)
at myPackage.CharacterDecoder.decodeBuffer(CharacterDecoder.java:61)
at myPackage.CharacterDecoder.decodeBuffer(CharacterDecoder.java:87)
at myPackage.UserSMSVerifier.messageGenarator(UserSMSVerifier.java:91)
at myPackage.Test1.main(Test1.java:8)
--Test1.java
package myPackage;
public class Test1{
public static void main(String[] args) throws Exception {
String testmessage = "kkkkkkkkkkkkkkk";
String contentMessage;
UserSMSVerifier.messageGenarator(testmessage);
}
}
--UserSMSVerifier.java
package myPackage;
import java.io.*;
import java.security.*;
import java.security.cert.*;
import javax.crypto.*;
import org.bouncycastle.openssl.*;
import org.bouncycastle.util.encoders.*;
//import android.os.*;
public class UserSMSVerifier {
static String signedMail;
static {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
}
public static String messageGenarator(String origninalMessage) throws Exception{
//load privateKey, Certificate
PEMReader userPrivateKey = new PEMReader(
new InputStreamReader(
new FileInputStream("C://Users//Lara//workspace_ee//TestCA_server//WebContent//"+"/pkcs10priv.key")));
PEMReader userCerti = new PEMReader(
new InputStreamReader(
new FileInputStream("C://Users//Lara//workspace_ee//TestCA_server//WebContent//"+"/userCert.cer")));
KeyPair userPrivate = (KeyPair)userPrivateKey.readObject();
X509Certificate userCert = (X509Certificate)userCerti.readObject();
java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
//MessageDigest.
//java.security.MessageDigest
byte[] dataTosend = origninalMessage.getBytes();
//generate a SecretKey for Symmetric Encryption
SymmetricEncrypt encryptUtil = new SymmetricEncrypt();
SecretKey senderSecretKey = SymmetricEncrypt.getSecret();
//encrypt the data using a Symmetric Key
byte[] byteCipherText = encryptUtil.encryptData(dataTosend, senderSecretKey, "AES");
String strCipherText = new BASE64Encoder().encode(byteCipherText);
//get reciever's public key
PublicKey pubKeyReceiver = userCert.getPublicKey();
//encrypt the SecretKey with the Receivers public key
byte[] byteEncryptWithPublicKey = encryptUtil.encryptData(senderSecretKey.getEncoded(), pubKeyReceiver,"RSA/ECB/PKCS1Padding");
String strSenbyteEncryptWithPublicKey = new BASE64Encoder().encode(byteEncryptWithPublicKey);
md.update(dataTosend);
byte bytedataTosend[] = md.digest();
String stringDataTosend = new String();
for (int i=0; i < bytedataTosend.length;i++){
stringDataTosend = stringDataTosend + Integer.toHexString((int)bytedataTosend[i] & 0xFF); }
//Message to be Signed = Encrypted Secret Key + data
String strMsgToSign = strSenbyteEncryptWithPublicKey + "|" + stringDataTosend;
//sign the Messsage
//char[] password = "password".toCharArray();
Signature yourSign = Signature.getInstance("MD5withRSA");
yourSign.initSign(userPrivate.getPrivate());
yourSign.update(stringDataTosend.getBytes());
byte[] byteSignedData = yourSign.sign();
//yourSign.
//heoolo
//return new String(Hex.encode(byteSignedData));
//values transmitted through unsecure channels ==> byteSignedData, strMsgToSign
String strRecvSignedData = new String (byteSignedData);
String[] strRecvSignedDataArray = strMsgToSign.split("|");
int intindexofsep = strMsgToSign.indexOf("|");
String strEncryptWithPublicKey=strMsgToSign.substring(0, intindexofsep);
String strHashOfData = strMsgToSign.substring(intindexofsep+1);
//decrypt to get the symmetric key
byte[] bytestrEncryptWithPublicKey = new BASE64Decoder().decodeBuffer(strEncryptWithPublicKey);
byte[] byteDecryptWithPrivateKey = encryptUtil.decryptData(byteEncryptWithPublicKey , userPrivate.getPrivate(), "RSA/ECB/PKCS1Padding");
//decrypt the data using the Symmetric key
javax.crypto.spec.SecretKeySpec secretKeySpecDecrypted = new javax.crypto.spec.SecretKeySpec(byteDecryptWithPrivateKey, "AES");
byte[] byteDecryptText = encryptUtil.decryptData(byteCipherText, secretKeySpecDecrypted, "AES");
String strDecryptedText = new String(byteDecryptText);
System.out.println("Decrypted Data is : " + strDecryptedText);
return new String(Hex.encode(byteSignedData));
}
}
--BASE64Decoder.java
package myPackage;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.io.PrintStream;
public class BASE64Decoder extends CharacterDecoder {
protected int bytesPerAtom() {
return (4);
}
protected int bytesPerLine() {
return (72);
}
private final static char pem_array[] = {
// 0 1 2 3 4 5 6 7
'A','B','C','D','E','F','G','H', // 0
'I','J','K','L','M','N','O','P', // 1
'Q','R','S','T','U','V','W','X', // 2
'Y','Z','a','b','c','d','e','f', // 3
'g','h','i','j','k','l','m','n', // 4
'o','p','q','r','s','t','u','v', // 5
'w','x','y','z','0','1','2','3', // 6
'4','5','6','7','8','9','+','/' // 7
};
private final static byte pem_convert_array[] = new byte[256];
static {
for (int i = 0; i < 255; i++) {
pem_convert_array[i] = -1;
}
for (int i = 0; i < pem_array.length; i++) {
pem_convert_array[pem_array[i]] = (byte) i;
}
}
byte decode_buffer[] = new byte[4];
protected void decodeAtom(PushbackInputStream inStream, OutputStream outStream, int rem)
throws java.io.IOException
{
int i;
byte a = -1, b = -1, c = -1, d = -1;
if (rem < 2) {
//throw new Exception("BASE64Decoder: Not enough bytes for an atom.");
}
do {
i = inStream.read();
if (i == -1) {
//throw new Exception();
}
} while (i == '\n' || i == '\r');
decode_buffer[0] = (byte) i;
i = readFully(inStream, decode_buffer, 1, rem-1);
if (i == -1) {
//throw new Exception();
}
if (rem > 3 && decode_buffer[3] == '=') {
rem = 3;
}
if (rem > 2 && decode_buffer[2] == '=') {
rem = 2;
}
switch (rem) {
case 4:
d = pem_convert_array[decode_buffer[3] & 0xff];
// NOBREAK
case 3:
c = pem_convert_array[decode_buffer[2] & 0xff];
// NOBREAK
case 2:
b = pem_convert_array[decode_buffer[1] & 0xff];
a = pem_convert_array[decode_buffer[0] & 0xff];
break;
}
switch (rem) {
case 2:
outStream.write( (byte)(((a << 2) & 0xfc) | ((b >>> 4) & 3)) );
break;
case 3:
outStream.write( (byte) (((a << 2) & 0xfc) | ((b >>> 4) & 3)) );
outStream.write( (byte) (((b << 4) & 0xf0) | ((c >>> 2) & 0xf)) );
break;
case 4:
outStream.write( (byte) (((a << 2) & 0xfc) | ((b >>> 4) & 3)) );
outStream.write( (byte) (((b << 4) & 0xf0) | ((c >>> 2) & 0xf)) );
outStream.write( (byte) (((c << 6) & 0xc0) | (d & 0x3f)) );
break;
}
return;
}
}