Bouncy Castle“编码密钥规格未识别”

Question

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;
}

GetFileContents：

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

您确实读取文件不正确。您忽略了InputStream.read()的返回值。您应该循环调用此方法，因为单个调用不能保证读取整个字节数组。

您可以手动读取：

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，只使用DataInPutStream.Readally（）方法。