错误“格式错误的内容”。在签名验证中

Question

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

          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);

Answer 1

根据javacard文档

ALG_RSA_SHA_PKCS1生成一个20字节的SHA摘要，根据PKCS#1(V1.5)方案填充摘要，并使用RSA对其加密

要在Android端验证签名，请使用以下代码

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