March 2016
Intermediate to advanced
550 pages
10h 57m
English
Content preview from C# 6 and .NET Core 1.0Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Signing data
To prove that some data has come from someone we trust, it can be signed. Actually, you don't sign the data itself, instead you sign a hash of the data. We will use the RSA algorithm combined with the SHA256 algorithm.
Signing with SHA256 and RSA
In the Ch11_Cryptography class library project, add the following code to the Protector class:
public static string PublicKey; public static string GenerateSignature(string data) { byte[] dataBytes = Encoding.Unicode.GetBytes(data); var sha = SHA256.Create(); var hashedData = sha.ComputeHash(dataBytes); var rsa = RSA.Create(); PublicKey = rsa.ToXmlString(false); // exclude private key var signer = new RSAPKCS1SignatureFormatter(rsa); signer.SetHashAlgorithm("SHA256"); return Convert.ToBase64String(signer.CreateSignature(hashedData)); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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