错误“格式错误的内容”。在签名验证中 [英] Error "Malformed content." in Signature Verification

问题描述

我想验证我的签名。我的签名是一个字节数组。我使用海绵城堡
，但出现错误 org.spongycastle.cms.CMSException：内容格式错误。
这是我的代码：

I want to verify my signature . my signature is a byte array. I use spongy castle I get error "org.spongycastle.cms.CMSException: Malformed content." this is my code:

   String base64 = Base64.toBase64String(signedchallenge);
   CMSSignedData cms = new CMSSignedData(Base64.decode(base64));
   Store store = cms.getCertificates();
   SignerInformationStore signers = cms.getSignerInfos();
   Collection c = signers.getSigners();

在 CMSSignedData cms = new CMSSignedData（Base64.decode（base64））行中出现错误

I get error in line " CMSSignedData cms = new CMSSignedData(Base64.decode(base64));"

我也使用这种方法来生成签名的挑战。它是在智能购物车中完成的

also I used this method for signed challenge generation. It did in smart cart

          Signature signature=Signature.getInstance(Signature.ALG_RSA_SHA_PKCS1,false);
      signature.init(thePrivateKey,Signature.MODE_SIGN);
      signLength=signature.sign(buffer,(short)(ISO7816.OFFSET_CDATA & 0xFF), inputlength, buffer, (short)(0));
      apdu.setOutgoingAndSend((short)0,signLength);

推荐答案

根据 javacard文档

ALG_RSA_SHA_PKCS1 生成20字节的SHA摘要，并根据PKCS＃1（v1.5）方案填充摘要，并使用RSA对其进行加密

ALG_RSA_SHA_PKCS1 generates a 20-byte SHA digest, pads the digest according to the PKCS#1 (v1.5) scheme, and encrypts it using RSA

要在Android端验证签名，请使用此代码

To verify the signature in Android side use this code

Signature sig = Signature.getInstance("SHA1withRSA");
sig.initVerify(publicKey);
sig.update(challenge);
boolean verifies = sig.verify(signedchallenge);

其中的签署挑战是缓冲区上可用的签名从（short）（ISO7816.OFFSET_CDATA& 0xFF）到 signLength 和挑战是要签名的原始数据

Where signedchallenge is the signature available on buffer from (short)(ISO7816.OFFSET_CDATA & 0xFF) to signLength and challenge is the original data to sign

这篇关于错误“格式错误的内容”。在签名验证中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！