java.lang.RuntimeException：错误：0D0680A8：asn1 编码例程：ASN1_CHECK_TLEN：错误标记

Question

我收到此错误（在标题中）。我不知道为什么，请帮忙。代码如下：

public static String decryptRSA(Context mContext, byte[] message) throws Exception { 


    InputStream in = mContext.getResources().openRawResource(R.raw.publicrsakey);
    X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(org.apache.commons.io.IOUtils.toByteArray(in));

    PublicKey publicKey = 
            KeyFactory.getInstance("RSA").generatePublic(x509EncodedKeySpec);

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    final String encryptedString = Base64.encode(cipher.doFinal(message));

    return encryptedString;


}   

编辑。最后，我使用扩展名为 .der 的公钥文件（之前是 .crt）解决了这个问题，并且有效的代码是：

InputStream in = mContext.getResources().openRawResource(R.raw.key);

        CertificateFactory cf = CertificateFactory.getInstance("X509");
        Certificate cert = cf.generateCertificate(new ByteArrayInputStream(org.apache.commons.io.IOUtils.toByteArray(in)));
        PublicKey pubKey = cert.getPublicKey();
        try
        {
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");            
            cipher.init(Cipher.ENCRYPT_MODE, pubKey);
            final String encryptedString = Base64.encode(cipher.doFinal(message));
            return encryptedString;
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return "";   

但是“divanov”回答了我提出的问题。

Answer 1

Exception error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag 表示

InputStream in = mContext.getResources().openRawResource(R.raw.publicrsakey);
byte[] pubKeyBytes = org.apache.commons.io.IOUtils.toByteArray(in);

不代表ASN.1 DER 编码消息。将其打印为十六进制以验证确切的问题

Log.v("HEX", org.apache.commons.codec.binary.Hex.encodeHexString(pubKeyBytes);