Tomek, it sounds like you aren’t linking to the BigInteger code correctly. I think you should resolve this problem rather than looking for a new library. I took a look at the source, and BigInteger::BigInteger(int) is most definitely defined. A brief glance indicates that the others are as well. The link errors you’re getting imply … Read more
Your problem is at the beginning of the VerifyData method: public static bool VerifyData(string originalMessage, string signedMessage, RSAParameters publicKey) { bool success = false; using (var rsa = new RSACryptoServiceProvider()) { //Don’t do this, do the same as you did in SignData: //byte[] bytesToVerify = Convert.FromBase64String(originalMessage); var encoder = new UTF8Encoding(); byte[] bytesToVerify = encoder.GetBytes(originalMessage); … Read more
You can’t just change the delimiters from —- BEGIN SSH2 PUBLIC KEY —- to —–BEGIN RSA PUBLIC KEY—– and expect that it will be sufficient to convert from one format to another (which is what you’ve done in your example). This article has a good explanation about both formats. What you get in an RSA … Read more
Unfortunately, the code in the answer you referenced isn’t really correct – it exports a private key PEM format, but with only the public key fields correctly set, this is not the same as exporting an RSA public key in standard format. I actually wrote the code in the other answer to that question, and … Read more
When encrypting, you use their public key to write a message and they use their private key to read it. When signing, you use your private key to write message’s signature, and they use your public key to check if it’s really yours. I want to use my private key to generate messages so only … Read more
You can create an RSACryptoServiceProvider from a PEM file using the following class (GetRSAProviderFromPemFile method). Warning: Don’t just copy code from StackOverflow without verification! Especially not crypto code! This code has bugs (see comments). You may want to write and run tests before using this in production (if you really have no better option). I … Read more
The RSA algorithm can only encrypt data that has a maximum byte length of the RSA key length in bits divided with eight minus eleven padding bytes, i.e. number of maximum bytes = key length in bits / 8 – 11. So basicly you divide the key length with 8 -11(if you have padding). For … Read more
well there are really enough examples for this, but anyway, here you go using System; using System.Security.Cryptography; namespace RsaCryptoExample { static class Program { static void Main() { //lets take a new CSP with a new 2048 bit rsa key pair var csp = new RSACryptoServiceProvider(2048); //how to get the private key var privKey = … Read more
openssl genrsa -out mykey.pem 1024 will actually produce a public – private key pair. The pair is stored in the generated mykey.pem file. openssl rsa -in mykey.pem -pubout > mykey.pub will extract the public key and print that out. Here is a link to a page that describes this better. EDIT: Check the examples section … Read more
I am using openssl 0.9.6g and I have created public/private keypair using RSA_generate_key(). It gives me keys like: —–BEGIN RSA PUBLIC KEY—– … —–END RSA PUBLIC KEY—– I think what I am looking for is “how to convert rsa public key from pkcs#1 to x509 format. Yeah, .Net can consume some ASN.1/DER encoded keys, and … Read more