java - 充气城堡 "encoded key spec not recognised"

Question

在亚马逊 Linux 中运行我的 jar 后，我遇到了这个特定的错误。它在我的 OsX 中运行良好。我在两台机器上使用相同的公钥和私钥。唯一的区别是 java 版本是

我制作、测试和编译脚本的机器:

Java(TM) SE Runtime Environment (build 1.6.0_65-b14-462-11M4609)

亚马逊服务器:

OpenJDK Runtime Environment (amzn-2.4.7.1.40.amzn1-x86_64 u55-b13)

这是导致错误的脚本部分:

public PublicKey getPublicKey(String _file)
    throws
        NoSuchAlgorithmException,
        NoSuchProviderException,
        InvalidKeySpecException,
        IOException
{
    X509EncodedKeySpec _spec = new X509EncodedKeySpec(_getFileContents(_file));
    KeyFactory _keyFactory = KeyFactory.getInstance(this._keyFactoryAlgo, this._provider);

    this._publicKey = _keyFactory.generatePublic(_spec);

    return this._publicKey;
}

获取文件内容:

private byte[] _getFileContents(String _fileName) throws IOException
{

    File _file = new File(_fileName);
    FileInputStream _fileStream = new FileInputStream(_file);

    byte[] _contents = new byte[(int) _file.length()];

    _fileStream.read(_contents);

    if(_fileStream != null)
    {
        _fileStream.close();
        _fileStream = null;
    }

    return _contents;
}

以下是完整的错误消息:

java.security.spec.InvalidKeySpecException: encoded key spec not recognised
at org.bouncycastle.jcajce.provider.asymmetric.util.BaseKeyFactorySpi.engineGeneratePublic(Unknown Source)
at org.bouncycastle.jcajce.provider.asymmetric.rsa.KeyFactorySpi.engineGeneratePublic(Unknown Source)
at java.security.KeyFactory.generatePublic(KeyFactory.java:328)
at xxx.CryptKey.getPublicKey(CryptKey.java:167)
at xxx.CryptSession.encryptWithPublicKey(CryptSession.java:316)
at xxx.Crypt.encrypt(Crypt.java:57)
at snippet.Snippet.main(Snippet.java:201)
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:606)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)

Answer 1

您确实错误地读取了文件。您忽略了 InputStream.read() 的返回值。您应该循环调用此方法，因为单独的调用不能保证读取整个字节数组。

您可以手动阅读:

int offset = 0;
int read =  _fileStream.read(_contents, 0, contents.length);
while (read > 0) {
    offset += read;
    read = _fileStream.read(_contents, offset , contents.length - offset );

}

或者您可以将底层输入流包装到 DataInputStream 中并仅使用 DataInputStream.readFully()方法。