rsacryptoserviceprovider using x509 certificates c#

Question

i am using a certificate generated by makecert which has both private and public key. The java side uses this public key to encrypt the data and .net decrypts it back.

Answer 1

The following code works fine for me:

        RSACryptoServiceProvider privateKey = new RSACryptoServiceProvider();
        privateKey.FromXmlString("wL8s+C8SnnlaaqR+VsyijmxOJOARNa4o7ZNsqfy3+9J9Ol2JNSjjMfQWoUnFtClzJBlZhU5KtuazQe8ZKXTX9YvKoJdRhlsonZkC04qiTMdO/FZIH00GrCRxeQ7XDnQnvPB9Bdsvs//7zrY3f7eLIkpIyK9cQHU+5jjJd5IT0eE=AQAB
83xxN7jvpg5z16pxz2tIQIdqd/EfmikR9Q2TjG2tosWkUSvtyx0xHZ9EqdTUbSGZZ+jgrabzkafYc7Mplylwew==
yqcnYSZEXHwJvRWi2V09PNEENTozQZywcFptUUGar9TciaQvoNv3lpnfzUKNBRdhzq4lImxkamajZlTWE5buUw==37HqilkbwyHwB6mOGhPkM3S1ujAK6qTk3JB2iEOTjMGrru9+7maJYz+Z47Wm3ARMXgyzrpZ9m8nqsJFfmoL11Q==v285tv8kMs2FkZYfuP/oOkwkkneBNejjj68Md2bmzlThZDCyQV2pvB1tmgPVHUsiPNCrCaKlFRISJzfa5rR8Ow==fgJE2TRe/SS+YqW0/I+FtHrdfbbao0/R3pHD4r4oceZQUemlBgZ7DxOAetebHKthlOdjGkmfWYB8EU4XoWggqw==FMLCwjy3wbAKiCANp6XFAJgz1o7365NFv0k41BpvasViTa4TgFFWH2ROJ7M9g0lPqJy+YrhrHcY9mqV5TVjTheQp0JeckrgO2B39XngPMAMMdne3rWGpf0Pfbj3FLfchMk6XYDXSZzCS2CmSeRA4aBMb+4R3YurixyJLrnGRMH0=");
        RSACryptoServiceProvider publicKey = new RSACryptoServiceProvider();
        publicKey.FromXmlString("wL8s+C8SnnlaaqR+VsyijmxOJOARNa4o7ZNsqfy3+9J9Ol2JNSjjMfQWoUnFtClzJBlZhU5KtuazQe8ZKXTX9YvKoJdRhlsonZkC04qiTMdO/FZIH00GrCRxeQ7XDnQnvPB9Bdsvs//7zrY3f7eLIkpIyK9cQHU+5jjJd5IT0eE=AQAB");

        {
            string text = "foo";
            byte[] encrypted = publicKey.Encrypt(Encoding.UTF8.GetBytes(text), false);
            byte[] decryptedBytes = privateKey.Decrypt(encrypted, false);
        }

Can you double-check that the exported private key is from cert.PrivateKey and the public key is from cert.PublicKey.Key?