基于C#生成公钥的iOS RSA加密

Question

我试图在iOS和C#之间建立RSA加密通道。

在iOS中，使用安全框架生成公钥。

代码片段，

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);

结果："MIGJAoGBAMIt95f4xaP7vYV/+Hdyb4DK0oKvw495PrRYG3nsYgVP7zlBE/rTN6Nmt69W9d0nGefuRlJFIr9TA8vlJmqTus6uXEasBuEjzH7vM7HQeAK6i8qEbVy0T+Uuq+16yy059NL7i/VWljVE6rqTntDUELmbIwNBwj6oBuL1z3SnFoMjAgMBAAE="

在C#中，我试图使用上面生成的公钥来加密数据。

C#代码片段：

const string pKey = "MIGJAoGBAMIt95f4xaP7vYV/+Hdyb4DK0oKvw495PrRYG3nsYgVP7zlBE/rTN6Nmt69W9d0nGefuRlJFIr9TA8vlJmqTus6uXEasBuEjzH7vM7HQeAK6i8qEbVy0T+Uuq+16yy059NL7i/VWljVE6rqTntDUELmbIwNBwj6oBuL1z3SnFoMjAgMBAAE=";
            byte[] publicKeyBytes = Convert.FromBase64String(pKey);              
            var stream = new MemoryStream(publicKeyBytes);
            Asn1Object asn1Object = Asn1Object.FromStream(stream);

我正在评估asn1Object并手动复制Modulus和Exponent，在本例中，

BigInteger modulus = new BigInteger("136357523654993073600337541886612209461653649830596179928022807129764638978058775447065286245685299741061442447812373893408612622888251899821604061796495147997132112844250946475016809624300789149318149170549447812758865778797994482272574020014042899233361299524505365746896235948770695552862804390518105473827");
            BigInteger exponent = new BigInteger("65537");

然后我就能用，

AsymmetricKeyParameter param = new RsaKeyParameters(false, modulus, exponent);
 RsaKeyParameters rsaKeyParameters = (RsaKeyParameters)param;
            RSAParameters rsaParameters = new RSAParameters();
 rsaParameters.Modulus = rsaKeyParameters.Modulus.ToByteArrayUnsigned();
            rsaParameters.Exponent = rsaKeyParameters.Exponent.ToByteArrayUnsigned();  
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            rsa.ImportParameters(rsaParameters);

Q1。有任何方法来迭代ans1Object并获得相应的数据吗？

Q2。有任何方法直接使用iOS生成的Base64(公钥)在C#中吗？

Q3。我需要将相同格式的公钥发送回客户端。

如能提供任何指导和帮助，将不胜感激。

Answer 1

所以如此，

经过这么多的研究和100年代的堆栈溢出标签。

我能够使用iOS在C#中生成的公钥进行加密。

pkey : Public Key given from client

下面的代码片段：

            const string pKey = "MIGJAoGBAMIt95f4xaP7vYV/+Hdyb4DK0oKvw495PrRYG3nsYgVP7zlBE/rTN6Nmt69W9d0nGefuRlJFIr9TA8vlJmqTus6uXEasBuEjzH7vM7HQeAK6i8qEbVy0T+Uuq+16yy059NL7i/VWljVE6rqTntDUELmbIwNBwj6oBuL1z3SnFoMjAgMBAAE=";
            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);

从现在起，代码还没有很好的优化，所以请忽略它。