这是客户端代码，公钥加密，私钥解密。公钥由服务器端提供,加密后数据用Base64编码发送出去。用Java代码是没有问题的，用C++版本对方就解密失败了。
C++平台使用的是OPenSSL库。都使用PKCS1填充模式。
找了几天没找出问题，什么大端，填充都看了，貌似都不是这些问题，确实找不出原因了

Java平台的代码如下(只贴核心代码,或者称为伪代码)

      //这是公钥
      byte[] arrayOfBytePublic = Base64.decode("
      MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw+D4pTERUemPtGIsteri\r
      eWoTbRTNHgZ0DN9Z4qfrS03eWP339/JBkGyKwlBykCzYDt8L0YMW/1Xg1appYGvf\r
      o4mnVvxzIbc1tuanH1Z+wnXbrHqgW5ndlMjZ328mDyDIRHPmzA8FMYSvPGJtnrv4\r
      H9Tc+CeKrmiWskbzxBg4T/MUxYsk/+WWg6y5dUU61rwr19HyBZKq93xH8IOctgeR\r
      xsf6oItQJ1y1Nd55XVEul2Lh5KtTZzZMWAwreIq/EhZJH0XdbOeHhy78/fMmQtkK\r
      pJqLpRMTas1ZBWmVnqHxgBQcvheOu6cNGJYbadisJDk7Yo6MW3M7kRbybeU7C9yf\r
      7QIDAQAB", 0);

      X509EncodedKeySpec localX509EncodedKeySpec = new X509EncodedKeySpec(arrayOfBytePublic);
      PublicKey PublicKey = KeyFactory.getInstance("RSA").generatePublic(localX509EncodedKeySpec);
      Cipher localCipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
      localCipher.init(1, PublicKey);
      Object localObject = arraymingwen.length;//明文
      ByteArrayOutputStream localByteArrayOutputStream = new ByteArrayOutputStream();
      //下面的是分段加密，2048bit的。最大长度是256
      int m = 0;
      if (localObject - n > 0)
      {
        if (localObject - n > (256-11));
        int i3;
        for (localObject1 = localCipher.doFinal(arrayOfByte1, n, (256-11)); ; localObject1 = localCipher.doFinal(arrayOfByte1, localObject1, i3))
        {
          int n = localObject1.length;
          localByteArrayOutputStream.write(localObject1, 0, n);
          int i1 = m + 1;
          Object localObject3 = i1 * (256-11);
          int i2 = i1;
          localObject1 = localObject3;
          m = i2;
          break;
          i3 = localObject - localObject1;
        }
      }
       localObject1 = localByteArrayOutputStream.toByteArray();
      localByteArrayOutputStream.close();
     //返回Base64的字符串
      return Base64.encodeToString(localObject1, 2);

windwos7平台的c++版本，Intel处理器,加密后用Base64编码,代码如下

int RsaEncrypt(CString str,char* encrypted)
{
CString key="-----BEGIN PUBLIC KEY-----\n" \
"MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw+D4pTERUemPtGIsteri\n" \
"eWoTbRTNHgZ0DN9Z4qfrS03eWP339/JBkGyKwlBykCzYDt8L0YMW/1Xg1appYGvf\n" \
"o4mnVvxzIbc1tuanH1Z+wnXbrHqgW5ndlMjZ328mDyDIRHPmzA8FMYSvPGJtnrv4\n" \
"H9Tc+CeKrmiWskbzxBg4T/MUxYsk/+WWg6y5dUU61rwr19HyBZKq93xH8IOctgeR\n" \
"xsf6oItQJ1y1Nd55XVEul2Lh5KtTZzZMWAwreIq/EhZJH0XdbOeHhy78/fMmQtkK\n" \
"pJqLpRMTas1ZBWmVnqHxgBQcvheOu6cNGJYbadisJDk7Yo6MW3M7kRbybeU7C9yf\n" \
"7QIDAQAB\n" \
"-----END PUBLIC KEY-----\n"; 


int padding = RSA_PKCS1_PADDING;
RSA * rsa = createRSA((unsigned char *)key.GetBuffer(0), 1);  

//分段加密
int inputLen=str.GetLength();
char* pSource=str.GetBuffer(0);
str.ReleaseBuffer();

int offSet = 0;
int i = 0; 
int result=0;
     
while (inputLen - offSet > 0)
{
if (inputLen - offSet > (256-11))
{
int retLen = RSA_public_encrypt(245, (const unsigned char*)(pSource+offSet),(unsigned char*) encrypted, rsa, padding);
encrypted=encrypted+retLen;
result+=retLen;
}
else
{
int retLen = RSA_public_encrypt(inputLen - offSet, (const unsigned char*)(pSource+offSet),(unsigned char*) encrypted, rsa, padding);
encrypted=encrypted+retLen;
result+=retLen;
}

i++;  
offSet = i * (256-11);  
}

return result;
}
//下面的代码用base64编码加密后的数据
CBase64 base;
string strbase= base.Encode((const unsigned char*)encoded,nLen);

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