java - 序列化 BigInteger : signum-magnitude mismatch

Question

我正在使用 Kaffe JVM(相当于 java 1.1)加密数据，并尝试使用 JDK7 解密数据。

在我的算法中，我使用 BigInteger(RSA 加密)。当我在 JDK 中测试应用程序时，一切正常，但是当我尝试使用 JDK7 从 Kaffe JVM 中生成的 BigIntegers 进行反序列化时，我得到了下面列出的异常。

我思考了很多问题的原因:

• 不同的 JVM:http://www-01.ibm.com/support/docview.wss?uid=swg1IV13214
• 大端和小端的问题
• 处理器类型问题(16 位、32 位、64 位)。

有什么想法可以解决或检测问题的原因吗？

提前致谢。

java.io.StreamCorruptedException: BigInteger: signum-magnitude mismatch
at java.math.BigInteger.readObject(BigInteger.java:3113)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1004)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1866)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1685)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1341)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1964)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1888)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1347)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369)
at commons.persistence.PersisterDataBigIntegerBuffer.fileToObjects(PersisterDataBigIntegerBuffer.java:87)
at commons.persistence.CryptoRSAFileManager.getDataFromFile(CryptoRSAFileManager.java:44)
at test.commons.csv.ParserTester.test(ParserTester.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Answer 1

看起来序列化格式有所不同。

要解决这个问题，一旦您从源 JDK 中找出存储格式，您可能必须继承 BigInteger 并重写 readObject 方法。为了给你一个关于你的目的的提示，这里是来自 OpenJDK 的 BigInteger 的 readObject 的相关部分:

// Read the alternate persistent fields that we care about
int sign = fields.get("signum", -2);
byte[] magnitude = (byte[])fields.get("magnitude", null);

// Validate signum
if (sign < -1 || sign > 1) {
   String message = "BigInteger: Invalid signum value";
   if (fields.defaulted("signum"))
      message = "BigInteger: Signum not present in stream";
   throw new java.io.StreamCorruptedException(message);
}