How to load the RSA public key from file in C#

How to load the RSA public key from file in C#

In C#, you can load an RSA public key from a file using the RSA class and the System.Security.Cryptography namespace. Here's an example of how to load an RSA public key from a file:

using System.Security.Cryptography; // Load the public key from file string publicKeyFile = "myPublicKey.xml"; RSA rsa = RSA.Create(); rsa.FromXmlString(File.ReadAllText(publicKeyFile)); RSAParameters publicKey = rsa.ExportParameters(false);

In this example, we create an instance of the RSA class and load the public key from a file called "myPublicKey.xml" using the FromXmlString method. We then export the parameters of the public key using the ExportParameters method with the includePrivateParameters parameter set to false.

Note that the public key must be in XML format and should include the <RSAKeyValue> XML element. Here's an example of what the public key XML file might look like:

<RSAKeyValue> <Modulus>...</Modulus> <Exponent>...</Exponent> </RSAKeyValue>

By loading an RSA public key from a file, you can easily integrate encryption and decryption capabilities into your C# application.

Examples

  1. How to load RSA public key from file in C#?

    Code Implementation:

    using System.Security.Cryptography; // Load RSA public key from file string publicKeyText = File.ReadAllText("public_key.pem"); RSA rsa = RSA.Create(); rsa.ImportFromPem(publicKeyText);

  2. C# code to read and load RSA public key from PEM file.

    Code Implementation:

    using System.Security.Cryptography; // Read and load RSA public key from PEM file string publicKeyText = File.ReadAllText("public_key.pem"); RSA rsa = RSA.Create(); rsa.ImportFromPem(publicKeyText);

  3. How to import RSA public key from a .cer file in C#?

    Code Implementation:

    using System.Security.Cryptography.X509Certificates; // Import RSA public key from .cer file X509Certificate2 cert = new X509Certificate2("public_key.cer"); RSA rsa = cert.GetRSAPublicKey();

  4. C# code to load RSA public key from XML file.

    Code Implementation:

    using System.Security.Cryptography; // Load RSA public key from XML file using (StreamReader reader = new StreamReader("public_key.xml")) { RSA rsa = RSA.Create(); rsa.FromXmlString(reader.ReadToEnd()); }

  5. How to open and use RSA public key stored in a .pem file in C#?

    Code Implementation:

    using System.Security.Cryptography; // Open and use RSA public key from .pem file using (StreamReader reader = new StreamReader("public_key.pem")) { RSA rsa = RSA.Create(); rsa.ImportFromPem(reader.ReadToEnd()); }

  6. C# code for loading RSA public key from a .key file.

    Code Implementation:

    using System.Security.Cryptography; // Load RSA public key from .key file string publicKeyText = File.ReadAllText("public_key.key"); RSA rsa = RSA.Create(); rsa.ImportFromPrivateKey(publicKeyText);

  7. How to read and load RSA public key from a .pub file in C#?

    Code Implementation:

    using System.Security.Cryptography; // Read and load RSA public key from .pub file string publicKeyText = File.ReadAllText("public_key.pub"); RSA rsa = RSA.Create(); rsa.ImportFromPem(publicKeyText);

  8. C# code to load RSA public key from a DER-encoded file.

    Code Implementation:

    using System.Security.Cryptography; // Load RSA public key from DER-encoded file byte[] publicKeyBytes = File.ReadAllBytes("public_key.der"); RSA rsa = RSA.Create(); rsa.ImportSubjectPublicKeyInfo(publicKeyBytes, out _);

  9. How to load RSA public key from a .cer certificate file in C#?

    Code Implementation:

    using System.Security.Cryptography.X509Certificates; // Load RSA public key from .cer certificate file X509Certificate2 cert = new X509Certificate2("public_key.cer"); RSA rsa = cert.GetRSAPublicKey();

  10. C# code to load RSA public key from a Base64-encoded file.

    Code Implementation:

    using System.Security.Cryptography; // Load RSA public key from Base64-encoded file string base64Key = File.ReadAllText("public_key.base64"); byte[] keyBytes = Convert.FromBase64String(base64Key); RSA rsa = RSA.Create(); rsa.ImportSubjectPublicKeyInfo(keyBytes, out _);

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