用iOS和C#实现RSA

Question

我们需要从RSA密钥中获取模和指数。我使用以下方法创建了我的pubilc密钥。请让我知道我们如何从中提取模数和指数部分。我已经读过这篇文章了。

 NSData* tag = [@"com.x.x.x" dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary* attributes =
    @{ (id)kSecAttrKeyType:               (id)kSecAttrKeyTypeRSA,
       (id)kSecAttrKeySizeInBits:         @1024,
       (id)kSecPrivateKeyAttrs:
           @{ (id)kSecAttrIsPermanent:    @YES,
              (id)kSecAttrApplicationTag: tag,
              },
       };

    CFErrorRef error = NULL;
    SecKeyRef privateKey = SecKeyCreateRandomKey((__bridge CFDictionaryRef)attributes,
                                                 &error);
    if (!privateKey) {
        NSError *err = CFBridgingRelease(error); 
        // Handle the error. . .
    }

    SecKeyRef publicKey = SecKeyCopyPublicKey(privateKey);

//现在我想从这个公钥中得到模和指数

编辑：-我也已经发送Base64字符串到服务器，但在那里，我们面临着一个相当大的问题，找到公钥ref从Base64字符串

C#代码段

const string pKey = "-----key-----" 
byte[] publicKeyBytes = Convert.FromBase64String(pKey);            
var stream = new MemoryStream(publicKeyBytes);
Asn1Object asn1Object = Asn1Object.FromStream(stream);

现在我们需要无法解析的公钥组件。任何帮助都很好

Answer 1

在C#上，您可以使用这种方式实现加密，

        const string publicKey = "MIGJAoGBAMIt95f4xaP7vYV/+Hdyb4DK0oKvw495PrRYG3nsYgVP7zlBE/rTN6Nmt69W9d0nGefuRlJFIr9TA8vlJmqTus6uXEasBuEjzH7vM7HQeAK6i8qEbVy0T+Uuq+16yy059NL7i/VWljVE6rqTntDUELmbIwNBwj6oBuL1z3SnFoMjAgMBAAE="; //generated on iOS
        byte[] publicKeyBytes = Convert.FromBase64String(pKey);

        var stream = new MemoryStream(publicKeyBytes);
        Asn1Object asn1Object = Asn1Object.FromStream(stream);
        Asn1Encodable asn1Sequence = asn1Object;   

        AlgorithmIdentifier algorithmIdentifier = new 
        AlgorithmIdentifier(PkcsObjectIdentifiers.IdRsaesOaep);  

        SubjectPublicKeyInfo subjectPublicKeyInfo = new 
        SubjectPublicKeyInfo(algorithmIdentifier, asn1Sequence);   

        AsymmetricKeyParameter asymmetricKeyParameter2 = 
        PublicKeyFactory.CreateKey(subjectPublicKeyInfo);    

        RsaKeyParameters rsaKeyParameters = 
        (RsaKeyParameters)asymmetricKeyParameter2;
        RSAParameters rsaParameters = new RSAParameters();
        rsaParameters.Modulus = rsaKeyParameters.Modulus.ToByteArrayUnsigned();
        rsaParameters.Exponent = rsaKeyParameters.Exponent.ToByteArrayUnsigned();

        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.ImportParameters(rsaParameters);
        string test = "John snow is the true king";
        byte[] encbyte = rsa.Encrypt(Encoding.UTF8.GetBytes(test), RSAEncryptionPadding.Pkcs1);
        string encrt = Convert.ToBase64String(encbyte);